- Chimera-users - RBVI Mailing Lists

symmetrical fit of maps
by Oleksiy Kovtun 10 May '17

10 May '17

Hi all, is there is a way to do symmetrical fit and add symmetrical copies for map to map fitting? The standard symmetrical fitting protocol (measure symmetry. #0...; sym #1 group #0 update true; fitmap...) only works for molecule to map fit. Thank you, Oleksiy Dr Oleksiy Kovtun Research Fellow Briggs group MRC Laboratory of Molecular Biology Francis Crick Avenue Cambridge CB2 0QH UK Tel: + 44 1223 267551 Email: okovtun(a)mrc-lmb.cam.ac.uk

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translation and rotation in MATLAB using transformation matrices from chimera
by Oleksiy Kovtun 10 May '17

10 May '17

Dear all, I need to merge two maps in MATLAB using alignment data from chimera. Inputs: two maps of the same box size, origin. I use matrixget - to report translation and rotation matrices for the aligned map . Translation operation works well when transferred into MATLAB (briefly, translation matrix gets converted in eulers and pased on to tom_rotate command in MATLAB, TOM package). However the x y z translation coordinates (the fourth column top to bottom in matrixget - output) are way off the real translation when using tom_shift command in MATLAB, TOM. I found out that if I open the rotated map and fit it again, it gives close to correct translation matrix. What's going wrong here? Does anyone have a solution how to overlay 3D arrays in MATLAB using chimera-reported transformation matrices? Many thanks, Oleksiy Dr Oleksiy Kovtun Research Fellow Briggs group MRC Laboratory of Molecular Biology Francis Crick Avenue Cambridge CB2 0QH UK Tel: + 44 1223 267551 Email: okovtun(a)mrc-lmb.cam.ac.uk Dr Oleksiy Kovtun Research Fellow Briggs group MRC Laboratory of Molecular Biology Francis Crick Avenue Cambridge CB2 0QH UK Tel: + 44 1223 267551 Email: okovtun(a)mrc-lmb.cam.ac.uk

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Multiple fitting of structures in to EM densities
by Healey, Joe 10 May '17

10 May '17

Dear chimera team, I have a large EM density I would like to fully populate with a number of copies of a protein. To be more specific, the EM density is of 2 concentric protein rings (EMDB-6720), and each concentric ring is stacked 3 or 4 times. Each ring is a hexamer, so I would like to populate every single ring with 6 copies of each protein (but the inner and outer rings are 2 different proteins). What would be the best mechanism to iteratively import a protein, populate an EM density space, then move on to the next one? Currently, I think if I was to simply open several copies of the protein, they would probably all try to fit within the same EM density position, leaving the rest of the structure empty? My apologies if this isn't totally clear, I've tried to explain it as best as I think I can. I'm happy to accept solutions in 'chimera language', python (or I also have Jaime's Pychimera installed). Many thanks Joe Healey M.Sc. B.Sc. (Hons) MSRB PhD Student MOAC CDT, Senate House University of Warwick Coventry CV47AL Mob: +44 (0) 7536 042620 | Email: J.R.J.Healey(a)warwick.ac.uk Jointly working in: Waterfield Lab<http://www2.warwick.ac.uk/fac/med/research/tsm/microinfect/staff/waterfield…> (WMS Microbiology and Infection Unit) and the Gibson Lab<http://www2.warwick.ac.uk/fac/sci/chemistry/research/gibson/gibsongroup/> (Warwick Chemistry) Twitter: @JRJHealey<https://twitter.com/JRJHealey> | Website: MOAC Page<http://www2.warwick.ac.uk/fac/sci/moac/people/students/2013/joseph_healey> | ORCID: orcid.org/0000-0002-9569-6738

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Re: [Chimera-users] Wire thickness
by Oliver Clarke 10 May '17

10 May '17

Hi Hernando, I used the ca_and_sidechains alias in this script (you should be able to get the individual commands from that). https://github.com/olibclarke/chimera-trimmings/blob/master/chimera_aliases… Cheers Oli > Dear Chimera > How do you set the thickness of the backbone and side chains independently to produce figures like the ones below (sorry I hijacked the picture used in blurred-display discussion). > > Thanks > > H.

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Wire thickness
by Hernando J Sosa 10 May '17

10 May '17

Dear Chimera How do you set the thickness of the backbone and side chains independently to produce figures like the ones below (sorry I hijacked the picture used in blurred-display discussion). Thanks H. [cid:image001.jpg@01D2C8F6.BEA06B60][cid:image002.jpg@01D2C8F6.BEA06B60]

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Re: [Chimera-users] Gaussian blur depth cueing? (ChimeraX)
by Tom Goddard 09 May '17

09 May '17

Before/after pair - at large size, I think the blur is helpful, but YMMV > On May 9, 2017, at 12:09 PM, Oliver Clarke <olibclarke(a)gmail.com <mailto:olibclarke@gmail.com>> wrote: > > Perhaps a better example: > > <brightness_blur.jpg> >> On May 8, 2017, at 10:07 PM, Tom Goddard <goddard(a)sonic.net <mailto:goddard@sonic.net>> wrote: >> >> Hi Oliver, >> >> The depth of field blur images I have seen of maps and molecules have all struck me as cool looking and less useful then conventional brightness based depth cuing. Brightness depth cue allows you to include more of the structure in back while reducing the obscuring effect it has on stuff in front. Blurring depth cue interferes much more with the stuff you want to be in focus. Your image minimizes the badness by not having any blurring in the central region of the image, but the periphery where there is blurring may be artistically nice, but I hope you are not looking at the structure there. >> >> That said the technique could be done using the depth buffer that assigns depth to each pixel — it can’t be done really well that way because that depth only gives the front-most object and if transparency is present the pixel shows multiple objects at different depths. I think it would require a compelling mock-up image to make it worth spending effort on this effect. It is relatively easy to make a mock-up image by using clip planes to save several images representing slabs at different depths, then blur each slab image differently depending on depth in a photo editor and composite. >> >> Tom >> >> >>> On May 5, 2017, at 6:42 AM, Oliver Clarke <olibclarke(a)gmail.com <mailto:olibclarke@gmail.com>> wrote: >>> >>> Hi, >>> >>> I was wondering if you have thought about implementing depth-dependent gaussian blur as a depth cueing mechanism in ChimeraX? >>> >>> The idea would be to blur the image in a manner dependent on the distance from the plane intersecting with the center of rotation, to mimick depth of field in a camera. >>> >>> Mocked up in the attached using a tilt/shift effect, but without access to real depth information - I wonder if it might better convey depth information than distance-dependent changes in brightness/contrast under some circumstances? >>> >>> Cheers >>> Oli >>> >>> <test_image_tilt_shift.png> >>> _______________________________________________ >>> Chimera-users mailing list: Chimera-users(a)cgl.ucsf.edu <mailto:Chimera-users@cgl.ucsf.edu> >>> Manage subscription: http://plato.cgl.ucsf.edu/mailman/listinfo/chimera-users <http://plato.cgl.ucsf.edu/mailman/listinfo/chimera-users> >> >

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Gaussian blur depth cueing? (ChimeraX)
by Oliver Clarke 09 May '17

09 May '17

Hi, I was wondering if you have thought about implementing depth-dependent gaussian blur as a depth cueing mechanism in ChimeraX? The idea would be to blur the image in a manner dependent on the distance from the plane intersecting with the center of rotation, to mimick depth of field in a camera. Mocked up in the attached using a tilt/shift effect, but without access to real depth information - I wonder if it might better convey depth information than distance-dependent changes in brightness/contrast under some circumstances? Cheers Oli

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Re: [Chimera-users] Query regarding chimera tool
by Elaine Meng 09 May '17

09 May '17

On May 8, 2017, at 10:54 PM, bushra TAJ <bushraistaj(a)gmail.com> wrote: > Hello Sir > I want to do some docking studies of my own synthesized compounds. I found them very active in some anti-cancer assays. > I will use AUTODOCK for this purpose. I have got the Pdb file of my target protein from PDB database. > My problem is how to make pdb of my molecule (input file for autodock) can I use chimera for that?? > I have chem-draw file format of my molecules will that open in chimera to make their pdb format. > Regards > In the menu under Tools….. Surface/Binding Analysis: There is a “Dock Prep” tool for preparing PDB files. There is also an “Autodock Vina” tool that will make prepared files in pdbqt format, but it will also run Autodock Vina docking (in other words, the prepared pdbqt files are a by-product but you could also use them as input to something else). You should look at the manual pages for more information. <http://www.rbvi.ucsf.edu/chimera/docs/ContributedSoftware/dockprep/dockprep…> <http://www.rbvi.ucsf.edu/chimera/docs/ContributedSoftware/vina/vina.html> Also in the future please send Chimera questions to chimera-users(a)cgl.ucsf.edu and include a useful subject line like “preparing molecules for docking.” Messages to my individual email address may not get answered. I hope this helps, Elaine ----- Elaine C. Meng, Ph.D. UCSF Computer Graphics Lab (Chimera team) and Babbitt Lab Department of Pharmaceutical Chemistry University of California, San Francisco

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All-by-all distances
by Elaine Meng 09 May '17

09 May '17

> From: Elaine Meng <meng(a)cgl.ucsf.edu> > Subject: Re: Chimera Question > Date: May 8, 2017 at 6:03:55 PM PDT > > Hi Shawn, > I’m out sick… please send Chimera questions to chimera-users(a)cgl.ucsf.edu list. On second thought, I think I can answer quickly. However, for future reference please use the user list for Chimera questions and include a informative “subject” line to make it easier for others to find … thanks! Command: findclash :lys@n test self overlap -99999 log true … will put all the Lys N -> Lys N distances (within about 1000 A … just use a larger-magnitude negative overlap if you think there are longer distances) in the Log. It won’t be a table, though, just a list of distances that you would have to process yourself. Or instead of “log true” (or in addition to it) you could use the “saveFile” option to specify putting the same output into a text file. Command and options described here: <http://www.rbvi.ucsf.edu/chimera/docs/UsersGuide/midas/findclash.html <http://www.rbvi.ucsf.edu/chimera/docs/UsersGuide/midas/findclash.html>> Output is like the following example for PDB 2gbp, with distances in the last column: 464 contacts atom1 atom2 overlap distance LYS 191.A N LYS 189.A N -1.010 4.290 LYS 223.A N LYS 227.A N -1.505 4.785 LYS 246.A N LYS 300.A N -3.378 6.658 […etc…] However I suspect maybe you meant NZ (the end of the sidechain) instead of the backbone N, in which case the command would be something like findclash :lys@nz test self overlap -99999 log true … with output like: 465 contacts atom1 atom2 overlap distance LYS 270.A NZ LYS 276.A NZ -1.932 5.212 LYS 308.A NZ LYS 246.A NZ -2.262 5.542 […etc…] Best, Elaine ----- Elaine C. Meng, Ph.D. UCSF Computer Graphics Lab (Chimera team) and Babbitt Lab Department of Pharmaceutical Chemistry University of California, San Francisco > >> On May 8, 2017, at 4:14 PM, Shawn Sternisha <ssternisha(a)chem.fsu.edu> wrote: >> >> Hello Dr. Meng, >> >> Sorry to bother you but I have a question about Chimera that I have not been able to find an answer to, despite intensive web searches. I have seen your name on a lot of useful posts and answers so I figured I would give emailing you a shot. I have been searching for a method to measure all possible distance between Lys residues in a protein in a high-throughput manner. >> >> For example, if my protein has 17 Lys residues, is it possible to generate a table that has distance measurements between the N atoms of all of them. I believe that would be 231 possible distances. Any advice you could provide would be greatly appreciated. Thank you for your time in advance. >> >> Best, >> Shawn Sternisha >> PhD Candidate, Miller Laboratory >> Dept. of Chemistry and Biochemistry >> Florida State University > >

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calculate FSC curve between experimental cryo EM map and model
by #AHMED TOFAYEL# 08 May '17

08 May '17

Dear all, If I want to calculate FSC curve between experimental cryo EM map and model, what is the correct procedure to do so? I will explain what I have tried so far. Although I have variable local resolution in my map, according to FSC=0.143 criterion I have a 4 Ang map (say 1.mrc), I have used 'molmap' command in Chimera to generate a simulated map at 4 Ang. Then I used "vop resample" to take care of the pixel and box values ( then saved as 2.mrc). Thereafter, I have used "e2proc3d.py 1.mrc fsc.txt --calcfsc=2.mrc and plotted the fsc.txt file to get the curve. I am not sure if I am on the right track. My pixel size is 1.28. Best regards, Tofayel

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MD file naming
by P. Buscemi Ph.D. 08 May '17

08 May '17

Please,,,, How does one specify the output file name and location for molecular dynamics output ? regards Paul Buscemi, Ph.D.

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Distance measurement file
by Marco Sette 08 May '17

08 May '17

Dear all, I have to measure the same interatomic distances in different molecules: it is possible to create a file like distance ... distance ... distance ... and use as input, just to avoid typing the same command many times? Thanks for your help, Marco

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hbonds and distances movie script questions
by mfellner＠msu.edu 05 May '17

05 May '17

Good day I am making a movie by writing a chimera command script and I searched through existing chimera topics but I could not find a solution for these issues: Is there a command to display hbonds, I have made a script now to select residues and find the hbonds, even color + line width them and then I get rid of them later by ~hbonds. What I would prefer is to have them premade (so I dont need to select residues during the movie) but not displayed, later I then displayed and undisplayed them with a scipt command. Also I could not get the lineType command to work inside the hbond script (lineWidth worked fine), I had to use the setattribute command in a second script line, so for a splitsecond I have a different linetype displayed. The second question is about distance labelling. I can set the options in the gui and then distances are displaed by a script with the distance in Angstrom shown. Is there a way to undisplay the distance label later but keep the dashed line, so change the gui option with a script? Also I assume this is not possible, is there a script to change where the label will show up next to the line? I have not looked into displaying and undisplaying 2D labels with scripts, maybe that is a possibility? Lastly which is not that important, is there any way to trim the corners easily? I think I am recording a lot of white space to the left and right throughout the movie, if I resize the window the molecule gets focused, so its no longer exactly where I had it related to the corners and I think I would have to adjust the script. Thank you so much, I hope I made my questions clear, chimera is an awesome program, movie is 21 minutes at the moment. Best wishes Matthias Fellner Michigan State University

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Sub-region selection
by Soumya Govinda Remesh 05 May '17

05 May '17

Hello, I am analyzing some tomography data. I am working with multiple maps - one which defines several cells and another that defines their inner organelles. I want to be able to select and save the map for individual cells and their corresponding map for the organelles. In addition to using the sub-region selection in Volume-viewer is there another way to select the cells? Thanks Best, Soumya Govinda Remesh, Ph.D. Postdoctoral Fellow at Advanced Light Source Lawrence Berkeley National Laboratory 1 Cyclotron Road MS 6R2100 Berkeley, CA 94720 (phone) 510-495-8179 (cell) 804-402-8730 sgremesh(a)lbl.gov

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Contact Maps (RRdistance Maps) questions:
by Nicole Persky 03 May '17

03 May '17

Hi All, I've just found the RRdistance Map function on Chimera and would like to compare between structures. I would like to: 1- make contact map of protein 1 to protein 1 with a cutoff of about 6 angstroms 2- make a contact map of protein 2 to protein 2 with a cutoff of about 6 angstroms 3- compare these two contact maps using the colors available for the whole contact map. I can only seem to compare the ENTIRE contact map of protein 1 to the ENTIRE map of protein 2, whereas I'd like to mask any contacts over 6 angstroms. Alternatively, if anyone knows of a way to export residue lists of contacts from the contact map site I could just compare them that way. ALSO: Anyone know of a way to map defined attributes onto a contact map? Thanks so much! Sincerely, Nicky

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Working with Electron density map
by MOHD HOMAIDUR RAHMAN 03 May '17

03 May '17

Dear Chimera user's I am trying to super impose molecular dynamics calculated density on cryo EM density and then slice densities to visualize each in different colors. I fitted density successfully now during slicing their X Y Z co-ordinate is not matching. The similar analysis were publish in Marzinek et al., 2016, Structure 24, 1–11 August 2, 2016 http://dx.doi.org/10.1016/j.str.2016.05.014 Please see figure 3 for more details and image attached here. Thank Regards Rahman '''''''''''''''''''''''''''''''''''''''''''''''''''''''''''' '''''''''''''''''''''''''''''''''''''''''''''''''''''''''''' ''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''' *M*d* H*omaidur* R**ahman *( Research Scholar ) Lab No. 510, Computational Biophysics Lab. Department of Biotechnology Indian Institute of Technology-Madras Chennai-600 036, India *Mobile No = +91- 7845991785 <078459%2091785>* '''''''''''''''''''''''''''''''''''''''''''''''''''''''''''' '''''''''''''''''''''''''''''''''''''''''''''''''''''''''''' '''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''

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Issue with docking in chimera and autodock vina
by Miss Charles 02 May '17

02 May '17

Dear Chimera Team, I have been trying to dock the small molecules pino-stilbene and trans-stilbene to chainA of the estrogen receptor on chimera using autdick vina. Suddenly, with almost no changes to my protocols I have been getting error message 13 permission of pino-stilbene denied or error message 134 permission of trans-stilbene denied. What am I supposed to do to avoid getting that error message? Thank you so much for your time and your help. Sincerely, Alexis Charles

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assistance
by Arthur Szabo 01 May '17

01 May '17

I asked this question several months ago, but rarely have applied the answer. I have a structure that has a long stretch that is disordered. In the structure it appears as a dashed line. If I highlight this section of the total sequence and then apply a color (red) the whole structure is then colored red. So how can I make the dashes slightly larger, and secondly color that stretch of dashes with a particular color without coloring the rest of the molecule? Thank you Arthur G. Szabo

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Re: [Chimera-users] [chimerax-users] animations
by Elaine Meng 01 May '17

01 May '17

> On Mar 6, 2017, at 6:21 AM, Giorgio Luciano <giorgio.luciano(a)gmail.com> wrote: > > Hello ! In the effort to create a more integrated pipeline with vastly used 3d software (I use mainly C4D and modo) is there a way to export animation from chimera in a format that other software can interpret. To make an example. If I wiggle a molecule in chimera, can I export the animation in a format that does not lot this info ? And eventually are there plan to create this feature in chimeraX ? > Giorgio Hi Giorgio, Chimera supports several export formats, see “File… Export Scene” in the menu or the “export” command. <http://www.rbvi.ucsf.edu/chimera/docs/UsersGuide/export.html> <http://www.rbvi.ucsf.edu/chimera/docs/UsersGuide/midas/export.html> However, these are for individual conformations, not for a whole animation, so you’d have to export at each step. Although ChimeraX is in early development, currently the “save” command formats include STL and X3D. The command “save formats” lists all the formats that can be saved. <http://rbvi.ucsf.edu/chimerax/docs/user/commands/save.html> These may be subject to the same limitations mentioned in the Chimera manual links above. I hope this helps, Elaine ---------- Elaine C. Meng, Ph.D. UCSF Computer Graphics Lab (Chimera team) and Babbitt Lab Department of Pharmaceutical Chemistry University of California, San Francisco

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independent rotation of multiple models
by Stefano Luciano Ciurli 01 May '17

01 May '17

Hello, if I have more than one structure in the same session, is there a way to rotate all models together along their respective axes (for example their intrinsic y-axis) without having to do so after selecting each individual model from the model panel? Regards and thanks, Stefano Ciurli

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coloumbic coloring when surface can't be calculated?
by Oliver Clarke 29 Apr '17

29 Apr '17

Hi, I have a structure (well, lots of structures) for which surface calculation fails in Chimera. I can rescue surface calculation using the ‘grid’ option (e.g. surf #0 grid 1), but then I can’t figure out how to apply coulombic coloring to that surface. I could use APBS, but PDB2PQR seems to choke on especially large/complicated structures. Is there any way around this? Would it be possible to export the coloumbic potential as a .dx file and use that for electrostatic surface coloring? Cheers Oli

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Pipes and Planks
by chemocev marker 27 Apr '17

27 Apr '17

Hi Chimera users I am wondering if its possible to assign 2 different color to 2 different helix when use the pipes and planks option in depiction. best Jiri

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file opening problem
by Arthur Szabo 27 Apr '17

27 Apr '17

I had a major problem with my computer - too long a story - Needless to say a computer shop technician had to reinstall my operating system, Windows 7, install Microsoft Office 2016. Of course there were several other programs that had to be reinstalled. So recently I downloaded the latest version of Chimera and have been able to work with PDB files and do all the things that I am used to doing. However, I always save the sessions that I have worked on. They are saved to the desktop C:\users\user\desktop The session files are saved to the desktop. Now comes the problem. When I double click on the file I want [cid:image002.png@01D2A987.C67BFFE0] I get the following message [cid:image001.png@01D2A986.AAC7D360] If I right click on the file then in the menu window click on open with Another window opens with Chimera being the recommended program. Click on OK and the same window as above comes up. This happens even with a .py file that I worked on today. I am puzzled. Ideas will be appreciated. Arthur G. Szabo

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Hey I'm
by Lia Thompson 21 Apr '17

21 Apr '17

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cutting the structure
by Dmitry Semchonok 20 Apr '17

20 Apr '17

Dear colleagues, I did a fit using the predicted models. Now I would like to cut the those parts which don't ft in my EM map. How can I do that? (My EM model has C2 symmetry). Thank you! Sincerely, Dmitry

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