- ChimeraX-users - RBVI Mailing Lists

Re: [chimerax-users] [ChimeraX] #5218: surface color value on mouseover replaced by chain info in status line
by Elaine Meng 15 Sep '21

15 Sep '21

Hi Boaz, When a bug is reported as fixed, the next successful daily build should contain the fix. Occasionally the fixer might forget to do all the steps to get it in that day, but it is supposed to be in there. Best, Elaine ----- Elaine C. Meng, Ph.D. UCSF Chimera(X) team Department of Pharmaceutical Chemistry University of California, San Francisco > On Sep 15, 2021, at 8:14 AM, Boaz Shaanan via ChimeraX-users <chimerax-users(a)cgl.ucsf.edu> wrote: > > Hi Tom, > Thanks a lot. Is this fix already implemented in the Chimerax daily build? > Cheers, > Boaz > > Boaz Shaanan, Ph.D. > Dept. of Life Sciences > Ben Gurion University > Beer Sheva, Israel > > On 14 Sep 2021 17:26, ChimeraX <ChimeraX-bugs-admin(a)cgl.ucsf.edu> wrote: > #5218: surface color value on mouseover replaced by chain info in status line > ----------------------------------+------------------------- > Reporter: Elaine Meng | Owner: Tom Goddard > Type: defect | Status: closed > Priority: high | Milestone: > Component: UI | Version: > Resolution: fixed | Keywords: > Blocked By: | Blocking: > Notify when closed: | Platform: all > Project: ChimeraX | > ----------------------------------+------------------------- > Changes (by Tom Goddard): > > * status: assigned => closed > * resolution: => fixed > > > Comment: > > Fixed. > > Made surface value status message suppress chain description status > messages on mouse hover. > > -- > Ticket URL: <https://www.rbvi.ucsf.edu/trac/ChimeraX/ticket/5218#comment:3> > ChimeraX <https://www.rbvi.ucsf.edu/chimerax/> > ChimeraX Issue Tracker > _______________________________________________ > ChimeraX-users mailing list > ChimeraX-users(a)cgl.ucsf.edu > Manage subscription: > https://www.rbvi.ucsf.edu/mailman/listinfo/chimerax-users

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Fwd: Display of actual values of APBS electrostatic potential projected on protein surface
by Boaz Shaanan 13 Sep '21

13 Sep '21

Boaz Shaanan, Ph.D. Dept. of Life Sciences Ben Gurion University Beer Sheva, Israel ---------- Forwarded message ---------- From: בעז שאנן <bshaanan(a)bgu.ac.il> Date: 9 Sep 2021 17:39 Subject: Display of actual values of APBS electrostatic potential projected on protein surface To: ChimeraX-users-request(a)cgl.ucsf.edu Cc: Hi, Is there a way in Chimerax to know the actual APBS electrostatic potential values in various points on the surface? Is there such feature already in Chimerax that I missed? Such feature is essential (I think) to monitor subtle changes in surface potential following mutations or other variations (pH, salt concentration etc.). If it's not there yet, could you please add it to the (enormous, I guess) to-do list? In Chimera this is done by moving the cursor to the various points of interest, a feature that I found most useful (and helpful in convincing color blind referees 😉). Cheers, Boaz Boaz Shaanan, Ph.D. Dept. of Life Sciences Ben-Gurion University of the Negev Beer-Sheva 84105 Israel E-mail: bshaanan(a)bgu.ac.il Phone: 972-8-647-2220 Fax: 972-8-647-2992 or 972-8-646-1710

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Re: [chimerax-users] Problems with Measuring Angles in ChimeraX
by Elaine Meng 10 Sep '21

10 Sep '21

> On Sep 10, 2021, at 11:41 AM, liangb2 <liangb2(a)rpi.edu> wrote: > > Hi Elaine: > I'm new to ChimeraX for Cryo-EM data. Currently, I imported my tomogram (.mrc file) into ChimeraX and acquired a density map of it. I was able to get the x,y,z coordinates of the three points of interest. However, I was not able to find ways to measure the angle among the three points on the tomogram density map. I have looked up tutorials, but all of those I have found are for proteins. > > Can you please provide some help on how I can measure the angle among three points on the density map? I would really appreciate your help. > Thank you for your time! > Best, > Biqing Liang Hi Biqing, Welcome to ChimeraX! We recommend using the chimerax-users(a)cgl.ucsf.edu address for asking questions (CC'd here so you don't need to do anything). Depending on the question, other people might want to see the answer, or give better answers than mine, or I might not know the answer at all. I don't know how you got the X,Y,Z coordinates for those three points. The way I know how to do it: You can put several "markers" (balls, fake atoms) at points on the surface, and/or at peaks in the density values. Then you can select any 3 of the markers (Shift-Ctrl-click on them) and then use the "angle" command: angle sel <https://rbvi.ucsf.edu/chimerax/docs/user/commands/angle.html> The way to put markers on interactively is first to go to the Markers toolbar across the top of the ChimeraX window. The different icons assign different ways of adding markers by mouse click. For example, clicking the third from left icon in the Markers toolbar assigns the right mouse button (= trackpad + Alt on Windows, trackpad + command key on Mac) to adding markers on the surface. See the following for what the different icons mean and explanation of markers: <https://rbvi.ucsf.edu/chimerax/docs/user/tools/markers.html> <https://rbvi.ucsf.edu/chimerax/docs/user/tools/markerplacement.html> I hope this helps, Elaine ----- Elaine C. Meng, Ph.D. UCSF Chimera(X) team Department of Pharmaceutical Chemistry University of California, San Francisco

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Question.
by Yunsik Kang 10 Sep '21

10 Sep '21

Hello, My name is Yunsik Kang, and I am a postdoc in Marc Freeman's lab at the Vollum Institute. I would love to use ChimeraX to predict the structure of my protein of interest. I watched all the YouTube videos and tried to run the program. Unfortunately, my protein is 5005 amino acids in humans and 2958 aa in yeast. I get a message "Please use the full AlphaFold system for long sequences." My question is what is the best way to approach this problem? Should I cut the protein in half and run the program? In one of the videos, it mentions after 700 aa it will have problems. Will it work if I get Colab-Pro? Or would the server crash no matter what. I am not a structural biologist, but I hope the structure can help be predict me with my research. Thank you, Yunsik

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Help with Volume Series
by Ioannis Skalidis 10 Sep '21

10 Sep '21

Greetings to all! I am trying to play a volume series data in ChimeraX (daily build). I open the multiple .mrc frames and they are automatically grouped, but then, when I use the vseries play command, I get an error message that I have not specified a volume series. What am I doing wrong? Should I open the frames differently? I also tried to open them with the open command, a wildcard character for the frame names and vseries true modifier but even then, it only opens the first frame, which I found very strange as well. Could somebody offer some advice? It would be greatly appreciated! Cheers, Yiannis. -- Skalidis Ioannis, MSc Biochemistry & Cryo-EM Scientist PhD Candidate Kastritis Laboratory for Biomolecular Research Cryo-Electron Microscopy & Computational Structural Biology ________________________________________________ Martin-Luther-Universität Halle-Wittenberg Biozentrum, Room A.2.21 IWE ZIK HALOmem NWG III "Kryo-Elektronenmikroskopie an Membranproteinkomplexen" Weinbergweg 22, 06120 Halle tel: +49 345 5524986 web (Lab): https://blogs.urz.uni-halle.de/kastritislab/ web (HALOmem): https://www.halomem.de/en/

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Re: [chimerax-users] [ChimeraX] #5198: Transparent background not transparent when selection outline shown
by Zhao, Bingchun (NIH/VRC) [F] 10 Sep '21

10 Sep '21

Hi, Tom, I received this below email reported that this bug has been fixed. Do I need to download the latest version and re-install the ChimeraX? Thank you very much! Best, Bingchun On 9/9/21, 9:35 PM, "ChimeraX" <ChimeraX-bugs-admin(a)cgl.ucsf.edu> wrote: #5198: Transparent background not transparent when selection outline shown --------------------------------------+------------------------- Reporter: bingchun.zhao@… | Owner: Tom Goddard Type: defect | Status: closed Priority: normal | Milestone: Component: Graphics | Version: Resolution: fixed | Keywords: Blocked By: | Blocking: Notify when closed: | Platform: all Project: ChimeraX | --------------------------------------+------------------------- Changes (by Tom Goddard): * status: assigned => closed * resolution: => fixed Comment: Fixed. Offscreen rendering was making a framebuffer with no alpha channel, even though for image save it already had an offscreen framebuffer with alpha channel. Made offscreen check and not create a new framebuffer if we are already using an offscreen framebuffer. -- Ticket URL: <https://www.rbvi.ucsf.edu/trac/ChimeraX/ticket/5198#comment:3> ChimeraX <https://www.rbvi.ucsf.edu/chimerax/> ChimeraX Issue Tracker

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outline the interface region in chimeraX
by Zhao, Bingchun (NIH/VRC) [F] 09 Sep '21

09 Sep '21

Hi, I wonder if there is a way to outline the interface region in ChimeraX like below: [cid:image001.png@01D7A597.5344EDF0] Previously, I did this in photoshop, but can we label the interface regions with those lines in ChimeraX? Thank you very much! Bingchun Bingchun Zhao, PhD Postdoctoral, VF Biodefense Research Section VRC/NIAID/NIH Bldg 40, Room 2607B 40 Convent Drive Bethesda, MD 20892 Tel: 301-761-7649 Email: bingchun.zhao(a)nih.gov<mailto:bingchun.zhao@nih.gov>

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Re: [chimerax-users] getting AlphaFold predictions
by Elaine Meng 09 Sep '21

09 Sep '21

Hi Yk, Forwarding to chimerax-users(a)cgl.ucsf.edu since I don't have a good answer for this currently. (We prefer you use that address for questions unless they include some data that needs to stay private.) Thanks! Elaine > On Sep 9, 2021, at 1:57 PM, Yunsik Kang <kangy(a)ohsu.edu> wrote: > > > Hi Elaine, > > Thank you again! > > I did open it and using ChimeraX I can see the pdb files and see the structure! It is amazing! > > One question. > > Since my protein is massive and this is just parts of my protein, is there a way ChimeraX can stitch it all together? > > Like Tristan says it is 1400 residues each, can I perhaps somehow stitch the whole thing together? > > Yk > > -----Original Message----- > From: Elaine Meng <meng(a)cgl.ucsf.edu> > Sent: Thursday, September 9, 2021 8:12 AM > To: Yunsik Kang <kangy(a)ohsu.edu> > Cc: meng Elaine <meng(a)cgl.ucsf.edu> > Subject: [EXTERNAL] Re: [chimerax-users] getting AlphaFold predictions > > Hi Yunsik, > I do not know the answer to your questions. We are not the developers of AlphaFold or the AlphaFold database. We only added tools in ChimeraX to connect to them. > > Maybe there is information at the AlphaFold database about what's in their download. I have never downloaded these myself. > <https://www.alphafold.ebi.ac.uk/download> > > All I know is that "tar" is a way of putting multiple files together and that you have to "untar" to get them apart. This is a standard computer file thing, not related to any specific kind of files. > > Usually if you doubleclick the tar file your computer will automatically untar it and make some new folder or folders containing the files. You would need to have enough space available on your computer for the large number of files. > > I don't know how they are named but maybe there is a README file that comes with it, or if not, you may need to look at the files with a text editor. Maybe they have the Uniprot IDs of the proteins somewhere in the names or header text of the file. > > Elaine > ----- > Elaine C. Meng, Ph.D. > UCSF Chimera(X) team > Department of Pharmaceutical Chemistry > University of California, San Francisco > > >> On Sep 8, 2021, at 7:36 PM, Yunsik Kang <kangy(a)ohsu.edu> wrote: >> >> Hi Elaine, >> >> Thank you for the fast response. My proteins are not found in the Alphafold search. >> >> I am new to this so bear with me. I downloaded the human TAR file as Tristan has said, but have no idea how to search or even start looking for my protein. >> >> Could you help? Or is this something I need professional help with? >> >> Would it help to tell you the protein I am interested in? >> >> Thank you again. >> Yunsik >> >> From: Elaine Meng <meng(a)cgl.ucsf.edu> >> Sent: Wednesday, September 8, 2021 3:44 PM >> To: Yunsik Kang <kangy(a)ohsu.edu> >> Subject: [EXTERNAL] Fwd: [chimerax-users] getting AlphaFold >> predictions >> >> Forwarding in case you did not get Tristan's reply below: >> >> >> Begin forwarded message: >> >> From: Tristan Croll via ChimeraX-users <chimerax-users(a)cgl.ucsf.edu> >> Subject: Re: [chimerax-users] getting AlphaFold predictions >> Date: September 8, 2021 at 3:17:28 PM PDT >> To: ChimeraX Users Help <ChimeraX-users(a)cgl.ucsf.edu> >> Reply-To: Tristan Croll <tic20(a)cam.ac.uk> >> >> The human protein will be in the EBI-Alphafold2 database, but not accessible to the search tool. For human proteins (and only human, so far) longer than ~2000 residues, the predictions are provided as multiple 1400-residue fragments starting at residue 1, 201, etc.. The only way to get those right now is to download the tarball of the complete set of human protein predictions, and find them in there. >> >> >> On 8 Sep 2021, at 23:08, Elaine Meng via ChimeraX-users <chimerax-users(a)cgl.ucsf.edu> wrote: >> >> Hi Yunsik, >> I don't know where/how you can run a prediction for such a long sequence, maybe others can comment on that. However: >> >> First make sure there is not already a predicted structure for that protein in the AlphaFold Database! E.g. try the Search button on the AlphaFold tool and see if the same UniProt entries as you are interested in are found. The database includes human and other well-studied species (maybe also the yeast you mentioned, depending on the exact species). If the prediction is already in the database, there is no need to run a new calculation. >> >> ChimeraX AlphaFold tool: >> <https://rbvi.ucsf.edu/chimerax/docs/user/tools/alphafold.html> >> >> I hope this helps, >> Elaine >> ----- >> Elaine C. Meng, Ph.D. >> UCSF Chimera(X) team >> Department of Pharmaceutical Chemistry University of California, San >> Francisco >> >> >> On Sep 8, 2021, at 2:45 PM, Yunsik Kang via ChimeraX-users <chimerax-users(a)cgl.ucsf.edu> wrote: >> >> Hello, >> >> My name is Yunsik Kang, and I am a postdoc in Marc Freeman’s lab at the Vollum Institute. >> >> I would love to use ChimeraX to predict the structure of my protein of interest. I watched all the YouTube videos and tried to run the program. >> >> Unfortunately, my protein is 5005 amino acids in humans and 2958 aa in yeast. I get a message “Please use the full AlphaFold system for long sequences.” >> >> My question is what is the best way to approach this problem? Should I cut the protein in half and run the program? In one of the videos, it mentions after 700 aa it will have problems. Will it work if I get Colab-Pro? Or would the server crash no matter what. >> >> I am not a structural biologist, but I hope the structure can help be predict me with my research. >> >> Thank you, >> Yunsik >> >> >> _______________________________________________ >> ChimeraX-users mailing list >> ChimeraX-users(a)cgl.ucsf.edu >> Manage subscription: >> https://www.rbvi.ucsf.edu/mailman/listinfo/chimerax-users >> >> _______________________________________________ >> ChimeraX-users mailing list >> ChimeraX-users(a)cgl.ucsf.edu >> Manage subscription: >> https://www.rbvi.ucsf.edu/mailman/listinfo/chimerax-users >> > >

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Save pdb file
by Zhao, Bingchun (NIH/VRC) [F] 09 Sep '21

09 Sep '21

Hi, First, I wanna thank you for all your work to develop ChimeraX, it’s so powerful. I do have a question and would like to have your input. I opened a EM density map (.mrc) and two pdb files in chimerax (version 1.2), then fit all the pdb models into the EM map. Then, I hide the EM map, only show the pdb models after fitting, and then I would like to save these all pdb files in a new pdb file with all position information after fitting. Would you please give me any direction how to do this? I tried saving them, but only partial pdb files saved, also tried combine commend, but it said no such commend. Thank you very much! Best, bingchun Bingchun Zhao, PhD Postdoctoral, VF Biodefense Research Section VRC/NIAID/NIH Bldg 40, Room 2607B 40 Convent Drive Bethesda, MD 20892 Tel: 301-761-7649 Email: bingchun.zhao(a)nih.gov<mailto:bingchun.zhao@nih.gov>

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error saving a surface
by Diego Amaya 08 Sep '21

08 Sep '21

Hi, I'm running a python script in --nogui and --script mode and I'm getting an error when doing rc(session, 'save surface.stl format stl'). The error message is : *QGuiApplication::font(): no QGuiApplication instance and no application font set.Segmentation fault* I'm working with debian 10 and I used the production release 1.2.5-1 Thanks in advance for the help. -- Diego A. Amaya Ramírez -- *Aviso legal:* El contenido de este mensaje y los archivos adjuntos son confidenciales y de uso exclusivo de la Universidad Nacional de Colombia. Se encuentran dirigidos sólo para el uso del destinatario al cual van enviados. La reproducción, lectura y/o copia se encuentran prohibidas a cualquier persona diferente a este y puede ser ilegal. Si usted lo ha recibido por error, infórmenos y elimínelo de su correo. Los Datos Personales serán tratados conforme a la Ley 1581 de 2012 y a nuestra Política de Datos Personales que podrá consultar en la página web www.unal.edu.co <http://www.unal.edu.co/>.* *Las opiniones, informaciones, conclusiones y cualquier otro tipo de dato contenido en este correo electrónico, no relacionados con la actividad de la Universidad Nacional de Colombia, se entenderá como personales y de ninguna manera son avaladas por la Universidad.

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capture reply from run(session, command)
by Sean Connell 08 Sep '21

08 Sep '21

Hello I was wondering if it is possible to capture the output that goes to the log when you run the python command run(session, command). For example if I run: run(session, "mmaker #2/A to #1/A”) Can I store in a variable the reply in the log file that has information about the RSMD? Sean

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distance between centers of mass using python API
by Diego Amaya 08 Sep '21

08 Sep '21

Hello, I'm trying to compute the distance between the centers of mass of two residues using the python API. I tried two different ways : 1. *rc(session, 'define centroid :43 massWeighting true name AA1')rc(session, 'define centroid :35 massWeighting true name AA2')rc(session, 'distance AA1 AA2') * 2. *rc(session, ' measure center :43 mark true name AA1')rc(session, 'measure center :35 mark true name AA2')rc(session, 'distance AA1 AA2')* But I get this error in the third line in both cases : *chimerax.core.errors.UserError: Missing or invalid "objects" argument: invalid objects specifier * What is wrong ? Thanks in advance. -- Diego A. Amaya Ramírez -- *Aviso legal:* El contenido de este mensaje y los archivos adjuntos son confidenciales y de uso exclusivo de la Universidad Nacional de Colombia. Se encuentran dirigidos sólo para el uso del destinatario al cual van enviados. La reproducción, lectura y/o copia se encuentran prohibidas a cualquier persona diferente a este y puede ser ilegal. Si usted lo ha recibido por error, infórmenos y elimínelo de su correo. Los Datos Personales serán tratados conforme a la Ley 1581 de 2012 y a nuestra Política de Datos Personales que podrá consultar en la página web www.unal.edu.co <http://www.unal.edu.co/>.* *Las opiniones, informaciones, conclusiones y cualquier otro tipo de dato contenido en este correo electrónico, no relacionados con la actividad de la Universidad Nacional de Colombia, se entenderá como personales y de ninguna manera son avaladas por la Universidad.

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Question about use of ChimeraX
by Jonathan Choong 07 Sep '21

07 Sep '21

Hi there, Hope you are doing well. I just had a question regarding ChimeraX that I was hoping to get some clarity on. I was wondering whether it was possible to use ChimeraX commands (such as open, run, save) in the system command line without actually opening the application interface? Thanks, hope to hear back from you. Kind regards, Jonathan

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Re: [chimerax-users] [Chimera-users] matchmaker for more than one chain
by Elaine Meng 03 Sep '21

03 Sep '21

Hi Mani, There is a different e-mail address for ChimeraX questions: it is chimerax-users(a)cgl.ucsf.edu CC'd here. Responses below... > On Sep 2, 2021, at 2:22 AM, manikandank via Chimera-users <chimera-users(a)cgl.ucsf.edu> wrote: > > Hi ChimeraX-users, > I have used recently the mmaker cmd to align two pdb each have multiple chains as below. > > mmaker #12/L,M,N to #5/S,A,B matrix blosum-62 showAlignment true > > But the sequence view shows only the alignment of chain L and S. > > 1. I would like to have aligned sequences of all chains used in mmaker alignement. Your command above does not use all the chains for fitting, it only chooses the single pair of chains that gives the best sequence-alignment score to superimpose the two models. The other chains might look superimposed but it is only because they moved along with the ones that were actually used for the fit. To use all three pairs of chains, you need to also use the "pairing ss" option: mmaker #12/L,M,N to #5/S,A,B matrix blosum-62 showAlignment true pair ss Then you would get three pairwise sequence-alignment windows: L/S, M/A, and N/B. matchmaker or mmaker command <https://rbvi.ucsf.edu/chimerax/docs/user/commands/matchmaker.html> pairing options <https://rbvi.ucsf.edu/chimerax/docs/user/commands/matchmaker.html#options> > > 2. Is it possible to open the saved RMSD header values in a file later just to color the pdb? Yes, but with several steps so it may not be that convenient. Probably easier just to save and restore the ChimeraX session (which includes the sequence alignment windows). Also remember if you move the structures relative to each other, the RMSD values will change. However, if you really want to save the RMSD values to file after you showed sequence alignments and header, then you could save them as an attribute file (that could be reopened/applied later): <https://rbvi.ucsf.edu/chimerax/docs/user/commands/save.html#attributes> The attribute name is seq_rmsd as explained here: <https://rbvi.ucsf.edu/chimerax/docs/user/tools/sequenceviewer.html#headers> > > 3. Do mmaker align entire pdb based on selected chains and Can calculate RMSD for all residues in the pdb? For the first question, 3A: yes, depending on the "pairing" option as explained above. For the second question, 3B, I'm not sure what you want. Remember that the main purpose of matchmaker is to superimpose the structures well, and then it happens to also give the RMSD over the positions that it chose to use, which are shown in the pinkish boxes on the sequence alignment. By default it uses fit iteration and discards loops that don't superimpose well in space. Matchmaker only gives the RMSD over the positions it uses. You could tell it to use all positions, but that would change the superposition. If you like the default superposition (that does not use all of the positions), you can use a separate command "rmsd" to measure RMSD over any sets of atoms that you want, without moving the structures or changing the superposition. Or, if you really want to use all of the positions in the sequence alignment for the fitting, you would have to use matchmaker option "cutoff none" ... but that usually does not give the best superposition. cutoff option <https://rbvi.ucsf.edu/chimerax/docs/user/commands/matchmaker.html#cutoffDis…> rmsd command (calculate RMSD in current positions, no fitting) <https://rbvi.ucsf.edu/chimerax/docs/user/commands/rmsd.html> Matchmaker only gives alpha-carbon RMSD. The rmsd command can give RMSD for any sets of atoms that you want, alpha-carbons only, or backbone only, or all atoms, as long as you give equal numbers of atoms from the two structures. However, it can be tricky to specify the correct sets of atoms if the residue numbering or residue types are different between the two structures. So you might want to first use "mmaker" with whichever options give you the best superposition, and then to measure RMSD over all positions in the alignment (which might not be used in the matchmaker fit), use the "rmsd" command afterward. > > 4. I also would like to change the displayed text for the sequence name. Presently it puts the filename as sequence name. > > [similar to 'Edit sequence name' in the sequence viewer in chimera] Sorry, there is no way yet to change the displayed sequence name in ChimeraX. > > Please let me know how this can be done. > thank you very much > with kind regards > Mani. I hope this helps, Elaine ----- Elaine C. Meng, Ph.D. UCSF Chimera(X) team Department of Pharmaceutical Chemistry University of California, San Francisco

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bundle dependency not installed
by Lagerwaard, I.M. (Ilse) 02 Sep '21

02 Sep '21

Hello, I'm currently developing a bundle with a dependency on pandas. Even though I included this dependency in my bundle_info.xml file, I get "ModuleNotFoundError: No module named 'pandas'". For now, I have installed pandas on the ChimeraX console via the command prompt. For future distribution, however, it would be nice if it were immediately installed together with the bundle. I would greatly appreciate your help with this issue. Thanks in advance, Ilse

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Re: [chimerax-users] output mmCIF file
by Elaine Meng 02 Sep '21

02 Sep '21

> On Aug 31, 2021, at 1:50 PM, Liu, Xiangan <Xiangan.Liu(a)uth.tmc.edu> wrote: > > Hi, > I have issue to output the models I build in pdb formation to mmCIF formation. I did not provide the sequences in orginal pdb files. Could please let me know what is the problem and how to fix it? > Thanks, > Xiangan > ---------- > File "/usr/lib/ucsf-chimerax/lib/python3.8/site-packages/chimerax/mmcif/__init__.py", line 89, in save > mmcif_write.write_mmcif(session, path, **kw) > File "src/mmcif_write.pyx", line 145, in chimerax.mmcif.mmcif_write.write_mmcif > File "src/mmcif_write.pyx", line 149, in chimerax.mmcif.mmcif_write.write_mmcif > File "src/mmcif_write.pyx", line 542, in chimerax.mmcif.mmcif_write.save_structure > KeyError: ('a1', 'RPGMMDSQEFS') > > KeyError: ('a1', 'RPGMMDSQEFS') > > File "src/mmcif_write.pyx", line 542, in chimerax.mmcif.mmcif_write.save_structure Hi Xiangan, We recommend using the chimerax-users(a)cgl.ucsf.edu address for questions (CC'd on this message, so you don't need to do anything this time). The address you used is just for commercial licensing. Actually, if you get a traceback like this, you can usually use ChimeraX menu: Help... Report a Bug instead of sending e-mail. You may need to attach your session file so that we can reproduce the problem. I don't know the answer, so I'm using this address to share your question with the others. Best, Elaine ----- Elaine C. Meng, Ph.D. UCSF Chimera(X) team Department of Pharmaceutical Chemistry University of California, San Francisco

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ChineraX saves huge session files
by Dror Noy 31 Aug '21

31 Aug '21

Hi Recently, ChimeraX on my Mac (macOS Catalina) started saving very large session file. Regardless of the size of the pdb file I load - the session file is 124 MB even for small 2-3 MB pdb files. I’d appreciate any help. Thanks Dror

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Region-wise specific sub-coloring of SS elements
by Gupta, Arun 30 Aug '21

30 Aug '21

Dear ChimeraX team, Is there an easier way around by which we can do region-wise specific sub-coloring of secondary structural elements within a large protein instead of using the tedious way of identifying the secondary structural elements and then describing the residue wise specific selection of set of residues related to secondary structure elements? I am aware that we can do coloring of specific secondary structure elements in ChimeraX by following commands for e.g “color helix “darkcyan” targ c”. But, I am looking forward to do coloring, let’ say “all the helices within a protein from residues 1-300 as dark cyan and residues 300-500 as blue” Thanks!!! Arun Arun Gupta PhD, MRSC Research Fellow Challis & Lewandowski Group Chemistry Department University of Warwick Gibbet Hill Road Coventry CV4 7AL United Kingdom

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Adding labels in chimera X?
by rob.gruninger＠gmail.com 27 Aug '21

27 Aug '21

I am trying to figure out how to add labels to a figure in chimeraX. It was easy in the older Chimera using 2d labels but I can’t find a similar function in chimeraX and the website seems to be down so I can’t access documentation. Any direction for how I can do this? I’m wanting to add residue labels to some specific residue (catalytic and substrate binding site residues) I want to point out in a paper Thanks Sent from my iPhone

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ChimeraX site down?
by Jonathan Sheehan 27 Aug '21

27 Aug '21

It might be pointless to send this query to the list (if it runs on the same server), but are you aware of any problems with your webserver right now? I'm trying to get the files for the latest density-fitting tutorial here: www.cgl.ucsf.edu According to this site, I'm not the only one having trouble reaching it: https://www.isitdownrightnow.com/cgl.ucsf.edu.html It claims it's "Down for everyone" and "for more than a week." Thanks! -Jonathan

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Save cropped map visible coordinates
by Isabelle Phan 26 Aug '21

26 Aug '21

Hello, I have 2 maps that I want to combine into a single one. I cropped each map by reducing the box size. I now want to save the map that is displayed. Impossible?! “Save” fails to keep the relative orientation of the display. I get 2 cropped maps that are no longer correctly oriented with respect to each other. "volume add” also fails to preserve the relative orientation. The volume resample sounds like it could be helpful, but I don’t understand how to get the grid values that match the displayed box. I’ve now tried multiple options for over 5 hours solid and am at my wits’ end. Any hints greatly appreciated. Isabelle

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ChimeraX Bundle
by Mirko Plößer 26 Aug '21

26 Aug '21

Dear ChimeraX Team, my name is Mirko Ploesser, I am a Phd student in the Frankgakis group at the BMLS (Buchmann Institue for Molecular Life Sciences) in Frankfurt (Germany) and currently working on a ChimeraX bundle. Thanks to your detailed tutorial on how to develop bundles, I have already made a good progeress in doing so. Currently, however, I am stuck with a problem that I hanve't found a solution to yet. I would be very thankful if you could give me advice on how to progress. The problem is described as follows: I click a set of markers in a volume (tomogram as an EM file) and save the corresponding positions. At those positions I want to load different and smaller volumes (also EM Files). The information about those smaller volumes - position and rotation - I have saved in a different file (a motivelist in also an EM format). Now I am stuck with the problem on how to update the rotation angles when I use the tool "Rotate model" using the right mouse. I know that the corresponding rotation matrix is printed in the log. Is there any way that I can use the information given to the log in my bundle code? Also, since we already have a working version of the bundle in Chimera, I found the module "openModel" very useful. Unfortunately I haven't been able to find an equivalent module in ChimeraX. So I guess there is a different approach to this used in ChimeraX. I would be very happy if you could also help me out in this regard. Thank you very much in advance for your time and effort. I am looking forward to hearing from you soon. Best, Mirko Ploesser

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How to make nucleotides same color?
by Visvaldas K. 25 Aug '21

25 Aug '21

I couldn't find how to change the default coloring of the nucleotides in ChimeraX. I'd like the color of all nucleotides to be blue like in the "old" Chimera: multiple colors distract from the details I am trying to convey. Is it possible? Best regards, Visvaldas

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ChimeraX File Error :: .vdb File Not Recognized
by Olivia Leland 24 Aug '21

24 Aug '21

Hello, I’m trying to upload a .vdb file from the Virus Particle Explorer databank. To my understanding, I should be able to upload a .vdb file for visualization. Every time I try to open said file, however, it returns the error: Is there a setting I haven’t activated in order to upload this file properly? Additionally, I’m unable to connect the software to the internet so I can’t use File>Fetch By ID... (it won’t show up for me) Do you have any suggestions on how to fix this? Best, Olivia Leland (she/her) Doctoral Student || Fraden Lab Martin A. Fisher School of Physics Brandeis University Waltham, MA 02453

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identifying surface residues
by Elaine Meng 23 Aug '21

23 Aug '21

On Aug 23, 2021, at 2:54 PM, Brian Yang <by2289(a)columbia.edu> wrote: > > Dear Dr. Meng, > I hope you are doing well. My name is Brian. I am a senior at Columbia University. I am currently doing research at the Columbia University Medical Center. I am contacting you because I have a few questions about using Chimera X. > > I am trying to use Chimera X to identify surface residues on a protein. [...] > > I have been looking through the Chimera API, and I found this method that I think could work: > https://www.cgl.ucsf.edu/chimera/docs/UsersGuide/surfnorm.html > > However, I'm not able to figure out how to do the Attribute Calculator in Chimera X, nor am I able to get the SES area. > > I saw your response in this email chain: > https://www.rbvi.ucsf.edu/pipermail/chimerax-users/2020-September/001484.ht… > > and I have tried it, but this is only for SAS area. > > So my questions are: > Do you think the surfnorm method is appropriate? If so, how would I achieve the Attribute Calculator functionality in Chimera X? If not, could you give me a better approach to remove these surface residues? > > Thank you for your time! > > Kind regards, > Brian Yang > Hi Brian! For asking questions about ChimeraX, we recommend using the address chimerax-users(a)cgl.ucsf.edu (CC'd here so you don't need to do anything this time) unless you are including something that needs to remain private. I edited out some details about your project above just in case. ChimeraX does not calculate solvent-excluded surface area (SESA) nor does it have an Attribute Calculator tool. However, if all you want to do is to identify which residues are on the surface, you could: (1) calculate solvent-accessible surface area (SASA) per residue. Command "measure sasa protein setAttribute true" or something like that. The "protein" part is that so waters, ligands, etc. are not enclosed in the calculated surface. The "setAttribute true" part assigns values to a residue attribute named "area" so that you can do the next step, although it could be omitted since it is already true by default. There are various other options too. <https://rbvi.ucsf.edu/chimerax/docs/user/commands/measure.html#sasa> (2) delete all residues with SASA greater than some value. You wouldn't be normalizing to a percentage exposed since we don't have the values to use for the denominator, but just the raw amount of solvent-accessible area. So you may want to tinker around with what value of the cutoff gives you reasonable results. <https://rbvi.ucsf.edu/chimerax/docs/user/commands/select.html> <https://rbvi.ucsf.edu/chimerax/docs/user/commands/atomspec.html#attributes> Example: open 4hvp measure sasa protein setAttribute true show hide ~protein hide ribbons sel ::area>20 color sel red color ~sel white ~sel ... see what you think, or try some other value... sel ::area>15 color sel red color ~sel white ~sel When you figure out what value you want to use, you could delete those residues, e.g. delete ::area>15 ...or if you're not sure what to use as a single cutoff and may want to process several times at different cutoffs, you can just write out all of the residues and their area values to an "attribute file"... see <https://rbvi.ucsf.edu/chimerax/docs/user/commands/save.html#attributes> However, if you really need a % exposure value normalized to account for different residue sizes, you would need to stick with Chimera, at least for now. I hope this helps, Elaine ----- Elaine C. Meng, Ph.D. UCSF Chimera(X) team Department of Pharmaceutical Chemistry University of California, San Francisco

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Labelling w.r.t Residue description
by Gupta, Arun 23 Aug '21

23 Aug '21

Dear ChimeraX team, How can we label the PDB structure in ChimeraX based on the selection as well as "description or residue type". I tried the specific "residues selection" for a PDB structure first and then typed the following command "label @ca residues attr residuename". I could get the residue numbering for the selected residues. But, I failed to get the residue description for the specific selected residues such as "residue 59 should be labelled as His59". Also, I noticed the "size " of the residue numbers "label " is bit small. How can we increase the " font size" ? Please find attached pic. Thanks!!! Arun Arun Gupta PhD, MRSC Research Fellow Challis & Lewandowski Group Chemistry Department University of Warwick Gibbet Hill Road Coventry CV4 7AL United Kingdom

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ChimeraX for Windows 10 Not Starting
by Mason Long 20 Aug '21

20 Aug '21

Hi, We're having problems getting ChimeraX to run on Windows 10 21H1. Each time we try running it, the cursor spins for a second or so and then nothing happens. I checked the Event Viewer and see every time we try running it an error event shows up in the Windows Application Error Event Log. Here's the output that shows up in the log for each of those versions: ---------------------------------------- Faulting application name: ChimeraX.exe, version: 1.2.5.0, time stamp: 0x60ab2a1d Faulting module name: Qt5WebEngineCore.dll, version: 5.15.2.0, time stamp: 0x5fad38ab Exception code: 0x80000003 Fault offset: 0x000000000014baff Faulting process id: 0x2b14 Faulting application start time: 0x01d795f43b7d3176 Faulting application path: C:\Program Files\ChimeraX 1.2.5\bin\ChimeraX.exe Faulting module path: C:\Program Files\ChimeraX 1.2.5\bin\lib\site-packages\PyQt5\Qt\bin\Qt5WebEngineCore.dll Report Id: db7d3af7-6986-47ed-ba27-3ce5e6bfcbae Faulting package full name: Faulting package-relative application ID: ---------------------------------------- Faulting application name: ChimeraX.exe, version: 1.1.0.0, time stamp: 0x5f5afaf7 Faulting module name: Qt5WebEngineCore.dll, version: 5.12.9.0, time stamp: 0x5ee3364a Exception code: 0x80000003 Fault offset: 0x0000000001989fb3 Faulting process id: 0x25d4 Faulting application start time: 0x01d795f5be3a354e Faulting application path: C:\Program Files\ChimeraX 1.1\bin\ChimeraX.exe Faulting module path: C:\Program Files\ChimeraX 1.1\bin\lib\site-packages\PyQt5\Qt\bin\Qt5WebEngineCore.dll Report Id: 5284e8f0-d191-4d3d-a49f-a93dc84117b0 Faulting package full name: Faulting package-relative application ID: ---------------------------------------- Faulting application name: ChimeraX.exe, version: 1.3.0.0, time stamp: 0x611f7fb2 Faulting module name: Qt5WebEngineCore.dll, version: 5.15.2.0, time stamp: 0x5fad38ab Exception code: 0x80000003 Fault offset: 0x000000000014baff Faulting process id: 0x2940 Faulting application start time: 0x01d795f6781afa93 Faulting application path: C:\Program Files\ChimeraX 1.3.dev202108200941\bin\ChimeraX.exe Faulting module path: C:\Program Files\ChimeraX 1.3.dev202108200941\bin\lib\site-packages\PyQt5\Qt\bin\Qt5WebEngineCore.dll Report Id: c07bfcd1-8b63-4e87-9217-a1a77cc449f8 Faulting package full name: Faulting package-relative application ID: ---------------------------------------- As you can see, this happens on both of the most recent production versions of ChimeraX (1.2.5 and 1.1.0.0) as well as on the latest daily build (1.3.dev202108200941) as of 8/20/2021. Please let me know if there's any more information you need from us. Thanks, Mason -- Mason Long Information Technology Consultant ITS Client Technology Natural Resources Building 211C Humboldt State University 1 Harpst St. Arcata, CA 95521 (707) 826-5636 (email only for now) Create a new request for help at http://www.humboldt.edu/ithelp

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Re: [chimerax-users] Automated Fitting of models into maps and saving fits with a correlation score > X
by Tom Goddard 18 Aug '21

18 Aug '21

Hi Matthias, When opening a script with the forEachFile option you can use $file in the script which will be replaced by the file basename. So in your script use fitsearch #2 in #1 resolution 20 search 1000 cutoff 0.9 save Tomo_fitted_$file_%d.pdb This is described in the forEachFile documentation https://www.rbvi.ucsf.edu/chimerax/docs/user/commands/open.html#forEachFile <https://www.rbvi.ucsf.edu/chimerax/docs/user/commands/open.html#forEachFile> Tom > On Aug 18, 2021, at 7:57 AM, Vorländer,Matthias Kopano <matthias.vorlaender(a)imp.ac.at> wrote: > > Dear Tom, > > Thank you again for the code for saving PDBs above a certain correlation score sing the fitmap command! I am now trying do use this on a large number of input volumes, and it’s working well except that I have a problem with naming the saved PDBs. So, my approach is the following: > > Open ChimeraX_Daily in no-gui mode > Type “open FitPDBinVolume.cxc foreach *.mrc” > The script FitPDBinVolume.cxc is very simple and looks like this: > > open 7apk > open /Volumes/matthias.vorlaender/Scripts/Chimera/fit_search.py > fitsearch #2 in #1 resolution 20 search 1000 cutoff 0.9 save /Volumes/plaschka/shared/data/em/Krios/20210616_endoTHO_tomo/Visualisation/mapping_back_using_imod/test/Tomo_fitted_%d.pdb > > What I would like to achieve is that the fitted PDBs are saved with a base name that matches that of the opened .mrc. Is there an easy way to do that? > > Thanks a lot in advance, > Best, > Matthias > > > From: ChimeraX-users <chimerax-users-bounces(a)cgl.ucsf.edu <mailto:chimerax-users-bounces@cgl.ucsf.edu>> on behalf of "Vorländer,Matthias Kopano via ChimeraX-users" <chimerax-users(a)cgl.ucsf.edu <mailto:chimerax-users@cgl.ucsf.edu>> > Reply to: "Vorländer,Matthias Kopano" <matthias.vorlaender(a)imp.ac.at <mailto:matthias.vorlaender@imp.ac.at>> > Date: Tuesday, 27. July 2021 at 07:40 > To: Tom Goddard <goddard(a)sonic.net <mailto:goddard@sonic.net>> > Cc: "chimerax-users(a)cgl.ucsf.edu <mailto:chimerax-users@cgl.ucsf.edu>" <chimerax-users(a)cgl.ucsf.edu <mailto:chimerax-users@cgl.ucsf.edu>> > Subject: Re: [chimerax-users] Automated Fitting of models into maps and saving fits with a correlation score > X > > Hi Tom, > > Thanks so much, that's amazing! > > To be clear, I am not searching tomograms, I am searching artificial tomograms that contain perfect "molmaps" of my protein of interest, so they are free of noise. Trying this in Chimera gave very good fits when asking for for enough initial placement. > > Thanks a lot for your help, > Best, > Matthias > > Holen Sie sich Outlook für Android <https://aka.ms/AAb9ysg> > > From: Tom Goddard <goddard(a)sonic.net <mailto:goddard@sonic.net>> > Sent: Tuesday, July 27, 2021 12:15:13 AM > To: Vorländer,Matthias Kopano <matthias.vorlaender(a)imp.ac.at <mailto:matthias.vorlaender@imp.ac.at>> > Cc: chimerax-users(a)cgl.ucsf.edu <mailto:chimerax-users@cgl.ucsf.edu> <chimerax-users(a)cgl.ucsf.edu <mailto:chimerax-users@cgl.ucsf.edu>> > Subject: Re: [chimerax-users] Automated Fitting of models into maps and saving fits with a correlation score > X > > Hi Matthias, > > You can run ChimeraX command scripts or Python scripts without a GUI, just start it at the shell with the "--nogui" option, for example > > chimerax --nogui mycommands.cxc > > I made some example Python code that runs fitmap search and saves PDB files for each unique fit with correlation over 0.9. > > https://rbvi.github.io/chimerax-recipes/fit_search/fit_search.html <https://rbvi.github.io/chimerax-recipes/fit_search/fit_search.html> > > I don't expect this to be a good way to search tomograms. It will be very inefficient. Template matching code designed for that problem is likely to work much better. Such code usually uses Fourier space methods to search all translations at once, so it can be much faster and more thorough. Even with that optimization it takes a long time to do the rotational search. > > Tom > > Example search of monomers in 14-mer GroEL. > > > > > > On Jul 25, 2021, at 9:05 AM, Vorländer,Matthias Kopano via ChimeraX-users <chimerax-users(a)cgl.ucsf.edu <mailto:chimerax-users@cgl.ucsf.edu>> wrote: > > Dear all, > > I have a set of 100 “artificial” tomograms, each containing approx 100 copies of a simulated density map of my protein of interest. I would like to fit each tomogram with the PDB of my POI, and save copies for all fits with a correlation score > 90%. Using the fitmap command in Chimera and then manually selecting the fits that meet the criterium works, but takes quiet a long time for a larger amount of data. I wonder if this could be automated, and if somehow would be able me to put together a script (is it possible to execute such tasks in a non-gui way, by submitting it to a cluster so that it could be parallelized?). > > Thanks a lot in advance, > Best, > Matthias > _______________________________________________ > ChimeraX-users mailing list > ChimeraX-users(a)cgl.ucsf.edu <mailto:ChimeraX-users@cgl.ucsf.edu> > Manage subscription: > https://www.rbvi.ucsf.edu/mailman/listinfo/chimerax-users <https://www.rbvi.ucsf.edu/mailman/listinfo/chimerax-users> >

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Re: [chimerax-users] How to adjust chimeraX's loop display style?
by Elaine Meng 17 Aug '21

17 Aug '21

Hi Xiangan, Sorry no, there is no way to smooth the loops (coil) parts of a ribbon or cartoon. Currently only strands can be smoothed. By "smoothed" I mean that the path of the ribbon may not follow the CA atoms exactly, which can cause problems when the sidechains are displayed. In Chimera when the sidechains were displayed with ribbon, you could get unrealistically long or short CA-CB bonds. So in ChimeraX we decided it was more important to have an accurate CA-CB bond length when sidechains are displayed. In the helix and coil (loop) there is no smoothing option so the ribbon is exactly on the CA positions. Strands have a smoothing option turned on by default, because people expect them to be drawn as mostly straight, and if strands are not smoothed, they are very ripply. In ChimeraX when the strands are smoothed but sidechains are shown, the CA atoms that fall off the ribbon are shown with a connecting "tether" instead of stretching or shrinking the CA-CB bond artificially. This is discussed in the "cartoon" help, see the "smooth" for how to adjust strand smoothing and "cartoon tether": <https://rbvi.ucsf.edu/chimerax/docs/user/commands/cartoon.html> <https://rbvi.ucsf.edu/chimerax/docs/user/commands/cartoon.html#tether> I investigated whether I could make a smoother representation with the "shape tube" command, but was unsuccessful. Sorry for the inconvenience -- I'm hoping that explaining the reasons might make it less annoying. :-) Best, Elaine ----- Elaine C. Meng, Ph.D. UCSF Chimera(X) team Department of Pharmaceutical Chemistry University of California, San Francisco > On Aug 17, 2021, at 1:12 PM, Liu, Xiangan <Xiangan.Liu(a)uth.tmc.edu> wrote: > > Hi, > ChimeraX's default loop style shows very cursive. I like the way loop shows in chimera. > Is there any way to make chimeraX's loop display straighter? > Thanks, > Xiangan > > <image.png>

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Chimerax for Ubuntu 21.04
by jobiph 17 Aug '21

17 Aug '21

Dear all, thank you for your fast and thorough answers. I reinstalled lifbffi7 and libllvm6.0 and now Chimerax works. Thanks a lot! Kind regards Jonas

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Re: [chimerax-users] Chimerax for Ubuntu 21.04
by Gabriel Goetten 16 Aug '21

16 Aug '21

Hi, I was able to run chimeraX on ubuntu 21.04 by installing the following package https://answers.launchpad.net/ubuntu/hirsute/amd64/libllvm10/1:10.0.1-6 Then you just need to download chimerax of the following version Ubuntu 20.04 (Linux) 64-bit from their website (deb package). Gabriel

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Chimerax for Ubuntu 21.04
by jobiph 16 Aug '21

16 Aug '21

Dear all, is the current version of Chimera for Ubuntu (20.04) compatible with the 21.04 Ubuntu release? If i try to install the 20.04 version a weird dependency error pops up and I can't install the missing library because on the canonical website it states that this library is deprecated. Thank you for your help and kind regards Jonas

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All-numeric residue names
by Tristan Croll 16 Aug '21

16 Aug '21

Was just looking at 2rg6, which happens to have a ligand with an all-numeric 3-character ID (287)... clearly not much thinking went into allowing that. Anyway, does the residue selection syntax have a way to disambiguate residue *number* 287 from residue *name* 287?

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Coulombic color combined surface
by W. C. 13 Aug '21

13 Aug '21

ChimeraX has no way to color ONE continous surface formed by combining multiple chains with coulombic or hydrophobic. It always color each chain surface separatly . Even though I generated a surface of combined chains by "surface enclose" command, ChimeraX still colors each chian seperately. In Chimera (not ChimearX), I could use surfcat to combine chains, generate one surface for combind chains, and color the surface as one continous. However, that could color large set of molecules. So please make ChimeraX can do the same.

3 3

(no subject)
by Haaris Ahsan Safdari 12 Aug '21

12 Aug '21

Rrg together with the university international realty of

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Morphing with ligands
by Volodymyr Dvornyk 10 Aug '21

10 Aug '21

Dear Colleagues, Tried to do morphing of the following structures: 6rdc, 6rep, and 6rd9. All three have the same ligands: ADP, ATP, Mg, and Zn. However, the resulting model lacks all of them. Any thoughts and/or suggestions? Thank you. Volodymyr ________________________________ DISCLAIMER: This electronic mail transmission contains confidential information intended only for the person(s) named. Any use, distribution, copying or disclosure by any other person is strictly prohibited. If you received this transmission in error, please notify the sender by reply e-mail and then destroy the message. Opinions, conclusions, and other information in this message that do not relate to the official business of Alfaisal University shall understand to be neither given nor endorsed by Alfaisal University. The contents of any attachment to this e-mail may contain software viruses, which could damage your own computer system. While "Alfaisal University" has taken every reasonable precaution to minimize this risk, we cannot accept liability for any damage which you sustain as a result of software viruses. You should carry out your own virus checks before opening the attachment.

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Trying to open .py files on Windows gives cPickle error
by Carnes, Jason 09 Aug '21

09 Aug '21

Hello, I am collaborating with someone using ChimeraX on a Mac. Their only option to save modified files results in a .py file extension. When I try to open .py files on my Windows install of ChimeraX I get an error: "ModuleNotFoundError: No module named 'cPickle'" Is there a way to manually install cPickle on my Windows computer that will allow me to open the .py files, or are Mac & PC not compatible? Thanks, Jason Jason Carnes, PhD Research Scientist IV | Center for Global Infectious Disease Research Seattle Children's Research Institute 206-884-3137 OFFICE CONFIDENTIALITY NOTICE: This e-mail, including any attachments, is for the sole use of the intended recipient(s) and may contain confidential and privileged information protected by law. Any unauthorized review, use, disclosure or distribution is prohibited. If you are not the intended recipient, please contact the sender by reply e-mail and destroy all copies of the original message.

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Difficulties Visualizing Isosurfaces from Cube File - Nathan Wood
by Nathan Wood 09 Aug '21

09 Aug '21

Dear ChimeraX I was having difficulty attempting to visualize computationally generated electrostatic potential isosurfaces originating from a Gaussian *.cube file. I tried to open the cube file from the shell only for it to incompletely visualize. I can provide an image if necessary. I found the following correspondence concerning cube files and isosurfaces, but unfortunately I am unable to resolve the issues of the cube file visualizing. https://www.rbvi.ucsf.edu/pipermail/chimerax-users/2021-April/002126.html <https://www.rbvi.ucsf.edu/pipermail/chimerax-users/2021-April/002126.html> https://www.rbvi.ucsf.edu/pipermail/chimerax-users/2020-May/001110.html <https://www.rbvi.ucsf.edu/pipermail/chimerax-users/2020-May/001110.html> I was curious if anyone has had experience with cubefiles. Any assistance would be greatly appreciated, Very Respectfully, Nathan Wood

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Superimpose
by Wisoot Chanit 08 Aug '21

08 Aug '21

Dear ChimeraX team, I am having a quesition. I am going to superimpose 2 monomers of P domain of norovirus GII.3 into a template PDB 6if5, but the template showed that information of its chains are missing. What should I do to make a dimer into 6if5. This is different from PDB 3mfg, which was a templete I used for my previous paper. Thank you. Jay

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Re: [chimerax-users] Saving 300dpi high resolution images with ChimeraX
by Elaine Meng 04 Aug '21

04 Aug '21

Hi Nada, ChimeraX questions should be sent to chimerax-users(a)cgl.ucsf.edu (CC'd here so you don't need to do anything this time). ChimeraX does not set the dpi. You just figure out the number of pixels you need and then save in pixels. I.e. if you want 3 inches wide at 600 dpi then you know you need 1800 pixel width, e.g. save myfile.png width 1800 If you open the resulting image file in just about any general image application like Photoshop, Gimp, or Mac Preview (etc.) then you can set the "resolution" or "dpi", but it's really the number of pixels you save in the first place that matters. I hope this helps, Elaine ----- Elaine C. Meng, Ph.D. UCSF Chimera(X) team Department of Pharmaceutical Chemistry University of California, San Francisco > On Aug 4, 2021, at 10:04 AM, Bejar, Nada <nbejar(a)houstonmethodist.org> wrote: > > Hello, > I am Nada, a postdoctoral fellow at Houston Methodist. > > I saw your name in this thread. https://www.rbvi.ucsf.edu/pipermail/chimerax-users/2020-January/000816.html > I tried your suggestion, but any number I put on width would still give me a 96dpi. > > I switched to the old Chimera and I can change the unit to print unit and that resolves the issues, but I have all my work done on ChimeraX. > > I do need to make figures today and help would be much much appreciated. > > Nada Bejar, Ph. D. > Postdoctoral Fellow > Kiss RNA Lab > Houston Methodist Research Institute > 6670 Bertner Avenue > Houston, TX 77030 USA

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Re: [chimerax-users] Error in ChimeraX application installation linux ubuntu
by Elaine Meng 04 Aug '21

04 Aug '21

Hi Vanessa, Please send ChimeraX questions to chimerax-users(a)cgl.ucsf.edu (CC'd here, so no need to do anything this time). Since I don't know the answer, I kept waiting for somebody else to answer your question... and didn't notice until now that you had sent it to only me. Thanks, Elaine ----- Elaine C. Meng, Ph.D. UCSF Chimera(X) team Department of Pharmaceutical Chemistry University of California, San Francisco > On Aug 1, 2021, at 1:51 AM, Vanessa Roy <vanessaroy(a)mail.tau.ac.il> wrote: > > Dear ChimeraX development team, > > We encountered issues while installing ChimeraX on our server and wanted to ask whether you could help us understand what the problem is? We haven't yet found a solution to our problem. > Here is the output after installation: > > # /home/apps/chimerax-1.2.5-rc-2021.05.24/bin/ChimeraX > X11 connection rejected because of wrong authentication. > qt.qpa.xcb: could not connect to display localhost:10.0 > qt.qpa.plugin: Could not load the Qt platform plugin "xcb" in "" even though it was found. > This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem. > > Available platform plugins are: eglfs, linuxfb, minimal, minimalegl, offscreen, vnc, wayland-egl, wayland, wayland-xcomposite-egl, wayland-xcomposite-glx, xcb. > > Fatal Python error: Aborted > > Current thread 0x00007f479c05d740 (most recent call first): > File "/home/apps/chimerax-1.1/lib/python3.7/site-packages/chimerax/ui/gui.py", line 119 in __init__ > File "/home/apps/chimerax-1.1/lib/python3.7/site-packages/ChimeraX_main.py", line 500 in init > File "/home/apps/chimerax-1.1/lib/python3.7/site-packages/ChimeraX_main.py", line 919 in <module> > File "/home/apps/chimerax-1.1/lib/python3.7/runpy.py", line 85 in _run_code > File "/home/apps/chimerax-1.1/lib/python3.7/runpy.py", line 193 in _run_module_as_main > Aborted (core dumped) > > We would greatly appreciate your advice on how to solve this issue. > > Many thanks for your help! > > Best, > Vanessa > -- > Vanessa Roy > Gil Ast Lab > Department of Human Molecular Genetics and Biochemistry > Sackler Faculty of Medicine | Tel Aviv University

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Maps comparison
by Dmitry Semchonok 04 Aug '21

04 Aug '21

Dear colleagues, I have 2 cryo-em maps of different resolutions. What will be the correct strategy to compare them and what are the tools and steps? Thank you Sincerely, Dmitry

2 1

C-alphas rendered as dots
by Pranav Shah 03 Aug '21

03 Aug '21

Hi Team, I am working with a huge model (and a correspondingly huge map), which makes the handling on my GPU accelerated desktop an agonisingly frustrating experience. In order to speed up simple (rigid-body) fitting of the map and model, I decided to use the -C-alpha trace of the pdb. However, the pdb gets rendered as a bunch of disconnected dots whereas the same pdb in Chimera is rendered correctly with all things. Is this a normal behaviour for ChimeraX? I could use Chimera, but I prefer the way ChiemraX handles large maps as compared to Chimera. In the absence of a quick fix, would there be a way to increase the size of the atoms? Best, Pranav -- Pranav Shah Postdoctoral Research Fellow. Division of Structural Biology, Wellcome Trust Centre for Human Genetics, University of Oxford, Roosevelt Drive, Oxford OX3 7BN, UK

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Showing C-alphas
by Casey 30 Jul '21

30 Jul '21

I am trying to show a single sphere at c-alpha carbons for some point mutants that i designed. When I use the command: show /a:473,476,477 atoms I can see all the atoms in chain A for residues 473, 476, 477. Using: show /a:473,476,477@cb atoms I can show "two spheres" for the c-alpha and c-beta carbon. When I use: show /a:473,476,477@ca atoms nothing happens and i don't see any spheres. If I show the full atom and then do: hide /a:473,476,477@ca* atoms Just the c-alpha sphere gets hidden. Why is it that i can't just show the c-alpha spheres? Unfortunately for my figure i make silhouettes of my model and so i can't just hide the other atoms by making them fully transparent

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Re: [chimerax-users] Automating Map segment
by Tom Goddard 30 Jul '21

30 Jul '21

To group by connectivity looks like you need to add d._group_con.value = True To figure out this stuff you would need to look at the Segger user interface code, it is in the ChimeraX distribution (under site-packages/chimerax/segger/segment_dialog.py) or on GitHub https://github.com/tomgoddard/segger/blob/master/Segger/src/segment_dialog.… <https://github.com/tomgoddard/segger/blob/master/Segger/src/segment_dialog.…> Tom > On Jul 30, 2021, at 10:42 AM, Sam W Marchant <smarchant(a)UCSD.EDU> wrote: > > Thanks so much im trying to group by connectivity and I am having trouble finding the right line of code to add that ability. Any thoughts? > >> On Jul 29, 2021, at 3:56 PM, Tom Goddard <goddard(a)sonic.net <mailto:goddard@sonic.net>> wrote: >> >> Hi Sam, >> >> I did an initial port of Segger from Chimera to ChimeraX (also called Segment Map) but that code was written by Greg Pintilie and he has not worked the ChimeraX version so there is no new command to run it in a script. It would probably not be too hard to write some Python to run it. The Chimera script mentioned in the mailing list is attached to my message about it. >> >> https://plato.cgl.ucsf.edu/pipermail/chimera-users/2017-October/013979.html <https://urldefense.proofpoint.com/v2/url?u=https-3A__plato.cgl.ucsf.edu_pip…> >> >> That won't work in ChimeraX, but here I attach the equivalent for ChimeraX. >> >> Segger was developed to segment molecules in EM maps, so I have doubts that it will do much good for your light microscopy. But you can decide that by running it by hand on some time steps and see if you like the result. >> >> Here is a different approach we used to quantify protrusions of crawling neutrophils in light sheet microscopy by placing markers that might be of interest. >> >> https://www.cgl.ucsf.edu/chimera/data/protrusion-sep2015/protrusions.html <https://urldefense.proofpoint.com/v2/url?u=https-3A__www.cgl.ucsf.edu_chime…> >> >> Tom >> >> >> >>> On Jul 29, 2021, at 3:24 PM, Sam W Marchant via ChimeraX-users <chimerax-users(a)cgl.ucsf.edu <mailto:chimerax-users@cgl.ucsf.edu>> wrote: >>> >>> Hi, >>> I am looking to apply the Map Segmenting to multiple time series of light sheet imaging and so I was wondering if there is either a command or a python function to automate the process. It looks here <https://urldefense.proofpoint.com/v2/url?u=http-3A__plato.cgl.ucsf.edu_pipe…> that you said it was going to be added to ChimeraX but I cannot find any info on how to do it. If not you mentioned a script in this answer, could you potentially send that to me? >>> Thanks, >>> Sam Marchant. >>> _______________________________________________ >>> ChimeraX-users mailing list >>> ChimeraX-users(a)cgl.ucsf.edu <mailto:ChimeraX-users@cgl.ucsf.edu> >>> Manage subscription: >>> https://www.rbvi.ucsf.edu/mailman/listinfo/chimerax-users <https://urldefense.proofpoint.com/v2/url?u=https-3A__plato.cgl.ucsf.edu_mai…> >> >> <segscript.py> >

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How to Align Chromosome Models with Different Number of Atoms?
by Cardiff Jiang 30 Jul '21

30 Jul '21

Dear ChimeraX User List, How can I compare two chromosome 3D models (PDB files) that have different numbers of "atoms"? Matchmaker tool reports, "Reference and/or match model contains no nucleic or amino acid chains. Use the command-line 'align' command to superimpose small molecules/ligands." align #1 toAtoms #2 reports, "Unequal number of atoms to pair, 49 and 63." align #1 toAtoms #2 matchNumbering true reports, "Pairing dropped 49 atoms and 63 reference atoms. No atoms paired for alignment." align #1:1-40 to #2:1-40 reports, "No atoms paired for alignment." How should I compare two chromosome 3D models below? Thank you. [image: image.png] Best regards, Zichen "Cardiff" Jiang

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Automating Map segment
by Sam W Marchant 29 Jul '21

29 Jul '21

Hi, I am looking to apply the Map Segmenting to multiple time series of light sheet imaging and so I was wondering if there is either a command or a python function to automate the process. It looks here<http://plato.cgl.ucsf.edu/pipermail/chimera-users/2017-October/013980.html> that you said it was going to be added to ChimeraX but I cannot find any info on how to do it. If not you mentioned a script in this answer, could you potentially send that to me? Thanks, Sam Marchant.

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Re: [chimerax-users] command line way for inverting selection
by Rangarajan, Amith 29 Jul '21

29 Jul '21

Hi, I am looking for a way to invert selection without reaching for the tool bar. I would like to know if there is a way to invert selection via the select command ( or some other command) thanks a lot, Amith

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ATOM has no alt loc B
by James Loy 28 Jul '21

28 Jul '21

Hi folks- I'm trying to add hydrogens to an mmCIF file (5byl) using the addh command. However, every time I try, I encounter the following error: Traceback (most recent call last): File "/usr/lib/ucsf-chimerax/lib/python3.8/site-packages/ChimeraX_main.py", line 712, in init run(sess, cmd) File "/usr/lib/ucsf-chimerax/lib/python3.8/site-packages/chimerax/core/commands/run.py", line 36, in run results = command.run(text, log=log, return_json=return_json) File "/usr/lib/ucsf-chimerax/lib/python3.8/site-packages/chimerax/core/commands/cli.py", line 2852, in run result = ci.function(session, **kw_args) File "/usr/lib/ucsf-chimerax/lib/python3.8/site-packages/chimerax/addh/cmd.py", line 63, in cmd_addh add_h_func(session, structures, template=template, in_isolation=in_isolation, **prot_schemes) File "/usr/lib/ucsf-chimerax/lib/python3.8/site-packages/chimerax/addh/cmd.py", line 170, in hbond_add_hydrogens add_hydrogens(session, atoms, type_info_for_atom, naming_schemas, hydrogen_totals, File "/usr/lib/ucsf-chimerax/lib/python3.8/site-packages/chimerax/addh/hbond.py", line 214, in add_hydrogens _attach_hydrogens(atom, altloc_hpos_info, bonding_info) File "/usr/lib/ucsf-chimerax/lib/python3.8/site-packages/chimerax/addh/hbond.py", line 895, in _attach_hydrogens add_altloc_hyds(atom, altloc_hpos_info, invert, bonding_info, total_hydrogens, naming_schema) File "/usr/lib/ucsf-chimerax/lib/python3.8/site-packages/chimerax/addh/cmd.py", line 862, in add_altloc_hyds h = new_hydrogen(atom, i+1, total_hydrogens, naming_schema, File "/usr/lib/ucsf-chimerax/lib/python3.8/site-packages/chimerax/addh/cmd.py", line 882, in new_hydrogen metal_pos = metal.get_alt_loc_coord(alt_loc) File "atomic_cpp/cymol.pyx", line 587, in chimerax.atomic.cymol.CyAtom.get_alt_loc_coord ValueError: Atom /A MG 702 MG has no alt loc B I'm using ucsf-chimerax_1.2.5-1_amd64.deb installed on Ubuntu 20.04. I've done some digging, and I cannot figure out what is going on. Any help would be appreciated. Thanks in advance! -James -- James Loy, Ph. D. 614.915.9792 LinkedIn <https://www.linkedin.com/in/james-m-loy-ph-d-ba2256a/>

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The PDB code for the demo picture on the website
by BAOCHENG LIU 28 Jul '21

28 Jul '21

Hi chimerax group, I am a postdoc in UCLA using chimerax. Thanks for providing all scientists this powerful software that makes life easier. I have a question here when I was learning the cartoon/ribbon style command line. So, I saw the 4 demo pictures on the website https://www.rbvi.ucsf.edu/chimerax/docs/user/commands/cartoon.html#style and just realized the structure just looks similar to one of my structures. Could you please tell me the PDB code for that structure so I can compare it with mine in detail? Hope it is released. Thank you. Best regards, Baocheng

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