March 2017 - Chimera-users - RBVI Mailing Lists

Ensemble models
by Mohamed Noor 20 Mar '17

20 Mar '17

Hello. I have an ensemble of models from phenix.ensemble_refinement. I notice that Chimera automatically loads the models and displays only a subset of atoms as "atoms/bonds". Can I save this as a preset while changing other settings manually so that I can go back to the automatic preset if I make a mistake somewhere? Secondly, is it possible for Chimera to calculate rmsf of each residue and output the values to a CSV file? I would like to replot them in Excel. Thanks. Mohamed

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Looking at docked data with the receptor shows as surface
by Jonathan Y Wang 20 Mar '17

20 Mar '17

To whom it may concern, Hi! I recently docked a ligand onto a receptor using the AutodockVina tool and when I opened the data the ligand seemed to be placed in the middle of the trimer. I showed the receptor as surface and it seems as if the ligand is too big to fit inside any of the holes surrounding the trimer, but somehow it has placed itself inside. I additionally opened it using PyMol to double check the file, but it also seems too small to fit inside any of the holes. My inquiry is this: Does AutodockVina take into account surface projections when performing docking? Thank you so much for your time, Jonathan Wang

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Getting names of selected atoms and renaming
by Vladyslav Dziuba 17 Mar '17

17 Mar '17

Dear Sir or Madam, I have some difficulties with using ORCA and UCSF Chimera together. Let me describe my problem first. I need to freeze some atoms (actually, a lot of atoms) in my calculations (geometry optimization), e.g. make their coordinates constant. To do that I need to specify numbers of atoms from xyz file, which is obtained from pdb-file. The problem is that for every atom in pdb-file OpenBabel generates a new number (for example H27 may become 100th atom in xyz file), so that specifying atoms that must be frozen becomes much more complicated. Given that, I'd like to ask to help me find answer on some questions: 1. How can I rename atoms? It would greatly help me identificate atoms that must be frozen. Can I rename only all selected atoms? 2.Can I modify names of selected atoms? 3. How can I get list of numbers of selected atoms? For instance I've chosen some aminoacids residues and I want to get names or numbers of all atoms chosen. Because if I one wants to get a list of atoms in xyz file, he needs names or numbers of atoms in pdb file, but the last ones are disordered. Manual atom picking and comparison in pdb- and xyz-files is very time-consuming. UCSF Chimera is a truly powerful program so I believe there must exist an elegant solution to my problem. Hope to receive a letter from you soon. Thanks in advance! Best regards, Vladislav Dziuba

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Re: [Chimera-users] Smoothing and binning volume data
by Tom Goddard 16 Mar '17

16 Mar '17

Set "step 1” above the histogram in the Volume Viewer window to display the full resolution of the data. If step is 2 that means only every other density map grid point is shown along each axis. The step gets set automatically to values greater than 1 when the map is large to avoid slowing down the graphics (rotating, zooming…). The initial step it chooses is controlled by the volume viewer menu Features / Data Display Options… , “Adjust step to show at most [N] Mvoxels”. Tom > On Mar 16, 2017, at 11:41 AM, Andrea Fera <andrea.fera(a)gmail.com> wrote: > > Hi Tom! > > Tank you for your information. > Let me try to explain better what I asked. > > What I seem to have revised is that the virtual sections of my maps have a much higher resolution than the rendered images by Chimera. > This should be because, evidently, I didn't understand yet how to control the default smoothing and/or binning in the volume viewer, of which I used until now the default value. > Can you tell me how to do, or what to vary? > > Thank you for the tip about using two colors in the rendering. Going to try immediately. > Thanks, > Andrea > > > > > > > > > > -- > Andrea Fera, PhD – [Senior Research Scientist] > Advanced Molecular Imaging ; DUNS 824-XXX-XXX > Unit for Cytoskeletal Dynamics , NICHD, National Institute of Health > Email: andrea.fera(a)gmail.com <mailto:andrea.fera@gmail.com> > > > On 16 March 2017 at 14:28, Tom Goddard <goddard(a)sonic.net <mailto:goddard@sonic.net>> wrote: > Not sure what you are asking. You can do Gaussian filtering to smooth a map, or binning to average 2x2x2 voxels together producing a smaller smoother map using the Volume Filter tool. > > To color “solid” style map rendering different colors at different data values click the nodes on the yellow line on the volume viewer histogram and then click the color button below the histogram to change the colors. > > Tom > > >> On Mar 15, 2017, at 7:49 PM, Andrea Fera wrote: >> >> Dear Tom, >> >> How are you? >> I am using Chimera more and more recently, and I have come to the point where I need to be able to control the amount of smoothing and/or binning that it inserts passing from the virtual sections to the rendering. >> >> Could you please send me some information on where I could look for this information? >> >> Another, related, thing. Is there a way that I can color in red or brighter color the part of the rendering including voxels below (or above) a certain threshold value? >> >> I hope that I am not asking anything too strange. >> Especially the first thing would help me greatly. >> >> Thank you, >> Andrea >> >> -- >> Andrea Fera, PhD – [Senior Research Scientist] >> Advanced Molecular Imaging ; DUNS 824-XXX-XXX >> Unit for Cytoskeletal Dynamics , NICHD, National Institute of Health

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Smoothing and binning volume data
by Tom Goddard 16 Mar '17

16 Mar '17

Not sure what you are asking. You can do Gaussian filtering to smooth a map, or binning to average 2x2x2 voxels together producing a smaller smoother map using the Volume Filter tool. To color “solid” style map rendering different colors at different data values click the nodes on the yellow line on the volume viewer histogram and then click the color button below the histogram to change the colors. Tom > On Mar 15, 2017, at 7:49 PM, Andrea Fera wrote: > > Dear Tom, > > How are you? > I am using Chimera more and more recently, and I have come to the point where I need to be able to control the amount of smoothing and/or binning that it inserts passing from the virtual sections to the rendering. > > Could you please send me some information on where I could look for this information? > > Another, related, thing. Is there a way that I can color in red or brighter color the part of the rendering including voxels below (or above) a certain threshold value? > > I hope that I am not asking anything too strange. > Especially the first thing would help me greatly. > > Thank you, > Andrea > > -- > Andrea Fera, PhD – [Senior Research Scientist] > Advanced Molecular Imaging ; DUNS 824-XXX-XXX > Unit for Cytoskeletal Dynamics , NICHD, National Institute of Health >

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VPAT (Voluntary Product Accessibility Template)
by Ashdale, Martin 16 Mar '17

16 Mar '17

Good Morning, I am looking into using your product with my AP Biology classes and I need to get approval to download your software. The IT Department would like the VPAT (Voluntary Product Accessibility Template) so that I can submit it for approval. If you have it available could you please send it to me. I appreciate your time and look forward to teaching with your product. Thanks, Martin Ashdale Biology Teacher Harford Technical High School 200 Thomas Run Road Bel Air, MD 21015 (410) 638-3804

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Selecting certain atoms with exception
by Kelvin Lau 14 Mar '17

14 Mar '17

Dear Chimera users, I'm trying to do the following: -select all the atoms of a single residue (trp) -except for one (residue number 285) I am not sure how to use a negation command to leave out only 285. Any ideas? Cheers Kelvin -- Kelvin Lau Structural Plant Biology Laboratory Department of Botany and Plant Biology Science III University of Geneva 30 Quai E. Ansermet 1211 Geneva Switzerland Email: kelvin.lau(a)unige.ch Phone: +41 22 379 3026

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possible Chimera bug - saving bonds in MOL2 format
by Marek Maly 13 Mar '17

13 Mar '17

Hello, it seems that Chimera (1.11.2) has problem to save some bonds in MOL2 format. If you open attached file "source.mol2" , Chimera reads/show perfectly all the bonds including those where is "Ru" atom present, but when you save it in MOL2 format in Chimera (see attached file "Chimera_MOL2.mol2"), then all the "Ru-x" bonds are omitted and naturally if you open this "Chimera MOL2" file in Chimera no "Ru-x" bonds are shown. Interestingly, if the original MOL2 file "source.mol2" is opened in Chimera and then saved in PDB format ("Chimera_PDB.pdb"), all bonds are written and so if this PDB file is opened in Chimera all bonds are visualized. Would be nice if the perfect bond preservation which works in MOL2->PDB case worked also in MOL2->MOL2 case. Best wishes, Marek -- Tato zpráva byla vytvořena převratným poštovním klientem Opery: http://www.opera.com/mail/

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chimera 1.11.2 interlaced stereo
by Jean-Marie WURTZ 13 Mar '17

13 Mar '17

Hi, I am a long time user of chimera and had never such a problem. I would like to use the interlaced stereo with a zalman monitor but I get the following error : Unable to turn on stereo viewing (Unable to find hardware stereo support (couldn't choose pixel format Couldn't configure togl widget)). I must say that VMD stereo is working. But I understood also that both programs work differently with regard to steero. My configuration: Dell M4500 precision Windows 10 Quadro FX 1800M driver 342.01 What can I do to get it working? Thanks for your help. Best regards -- Jean-Marie Wurtz Professeur de Bioinformatique Tél : +33 (0)3 69 48 51 04 Fax : +33 (0)3 88 65 32 76 jm.wurtz(a)unistra.fr<mailto:jm.wurtz@unistra.fr> wurtz(a)igbmc.fr<mailto:wurtz@igbmc.fr> IGBMC-CEBGS Département de Biologie et de Génomique Structurales Equipe de Biologie Structurales de Cibles Epigénétiques Parc d'Innovation, 1 rue Laurent Fries BP 10142 F - 67404 ILLKIRCH CEDEX http://archive.igbmc.fr/recherche/Prog_ISB/Eq_JCava/index.html [UniversitÃ© de Strasbourg]<http://www.unistra.fr>

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Re: [Chimera-users] [chimerax-users] animations
by Elaine Meng 12 Mar '17

12 Mar '17

Hi Giorgio, You would still have to use the “export” command that exports one file at a time, but it can be run at every frame by combining it with the “perframe” command. For example, in Chimera the following (should be all one line even though the Mail app may break it up): perframe "export ~/temp/$1.x3d" zero 2; play wiggle #0 24-67,68-119,123-244,267-286,290-355,356-387 50; wait 50; ~perframe …where ~/temp is a directory that already exists, will make files 01.x3d …. 50.x3d in that directory. In ChimeraX, there is a “perframe” command and “save” to export X3D, but no “play wiggle” command. <http://rbvi.ucsf.edu/chimerax/docs/user/index.html#commands> 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 > On Mar 9, 2017, at 11:44 AM, Giorgio Luciano <giorgio.luciano(a)gmail.com> wrote: > > Thanks for the info and sorry for my late reply. I generally export using x3d what I was thinking about is, how can someone export the single model for an animation ? As an example if I make wiggle a molecule play (wiggle #0 24-67,68-119,123-244,267-286,290-355,356-387 200 ) may I export in batch the molecules for the single frame ? > Any help will be greatly appreciated :) >

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Chimera-users March 2017