April 2022 - ChimeraX-users - RBVI Mailing Lists

An error opening chimerax seesion
by Yehuda Halfon 11 Mar '26

11 Mar '26

Hi all, I'm using chimeraX 0.8 (2018-12-17) on centos 7 (can't remember the build). Sometimes when I load a session that was saved using this version of chimeraX it gives me this error: Unable to restore session, resetting. Traceback (most recent call last): File "/software/graphics/chimerax/lib/python3.6/site-packages/chimerax/core/ session.py", line 593, in restore obj = sm.restore_snapshot(self, data) File "/software/graphics/chimerax/lib/python3.6/site-packages/chimerax/ std_commands/view.py", line 214, in restore_snapshot for k,v in data ['view attrs'].items(): TypeError: 'NoneType' object is not subscriptable After that I can't open the session again, so I need to remake it. Help, Yehuda Halfon

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ISOLDE and secondary structure restraints
by Guido Hansen 02 Mar '26

02 Mar '26

Hi all, I just started model building in cryoEM maps and get great results using ISOLDE on AlphaFold2-derived initial models. I have a question which is mainly directed to Tristan I guess: Is is possible to use the command line/script to apply secondary structure restraints in ISOLDE? I would like to restrain the initial secondary structure assignment from Alphafold especially at resolution worse than 3.5 A. At the moment I select each and every residue range assigned to helix, parallel or antiparallel beta-strand one after the other and turn on the corresponding restrains in the ISOLDE GUI. Is there a better way via command line of script? Cheers, Guido -- PD Dr. Guido Hansen Group Leader UNIVERSITÄT ZU LÜBECK INSTITUT FÜR BIOCHEMIE Tel +49 451 3101 3122 Fax +49 451 3101 3104 E-Mail hansen(a)biochem.uni-luebeck.de www.biochem.uni-luebeck.de [1] Ratzeburger Allee 160 23562 Lübeck Links: ------ [1] http://www.biochem.uni-luebeck.de

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Focus in ChimeraX
by Luca Pellegrini 10 Oct '25

10 Oct '25

Hi, What is the ChimeraX equivalent to the Focus command in Chimera? I have selected a portion of a structure, and would like to bring it into focus without dragging it into view. Also Focus would automatically set the selection as the pivot point. Best wishes, Luca Luca Pellegrini, PhD Department of Biochemistry University of Cambridge Cambridge CB2 1GA lp212(a)cam.ac.uk

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Surface dust command in the .cxc script
by 李泽 24 Feb '25

24 Feb '25

Hi all: I'm trying to use the .cxc script to run the software, I found that the "surface dust" command has never been executed in it. Have anyone met the same problem? Any suggestions. Thank you all. Best, Ze

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Get color code of a custom color
by Ahmad Khalifa 11 Feb '25

11 Feb '25

I created a custom color that I want to use in a different session. is there a way to do that besides trying to match colors by eye? Regards.

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Double and Triple Bond Stick Style
by Smith, Chase 05 Feb '25

05 Feb '25

Dear ChimeraX, I was just wondering why there is no way to represent a double or triple bond in either the ligands or the protein amino acids when viewing as a Stick or Ball-and-Stick representation? I sometimes use Chimera or ChimeraX to make visuals for my lectures, and the students often have difficulty in understanding due to the absence of the multiple bonds. I would love to have the ability to represent the double or triple bonds with multiple lines between the atoms. Thank you, Chase Smith ... ChaseSmith, PhD Chair, Department of Pharmaceutical Sciences & Associate Professor of Medicinal Chemistry School of Pharmacy MCPHS University 19 Foster Street | WorcesterMA01608 T 508.373.5717F 508.890.5618C 978.855.7203 chase.smith(a)mcphs.edu www.mcphs.edu MCPHS University Confidentiality Note: This e-mail, and any attachment to it, is intended to be confidential and might be legally privileged. It is intended solely for the use of the addressee. If you are not the intended recipient, you are hereby notified that reading, copying, disseminating or distributing this email is strictly prohibited. If you have received this e-mail in error, please immediately return it to the sender and delete it from your system. Thank you.

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Quest 2 Support?
by Blaine Hewitt 27 Dec '24

27 Dec '24

Hello, my name is Blaine Hewitt. Now I know that you have stated previously that you have no intention of bringing support to the Oculus Quest. Which is completely understandable since I know that not only would you have to develop around a completely new Operating System but another CPU architecture and much much more I assume. But with the soon release of the Oculus Quest 2 and it's new XR 2 chip-set makes a pretty good argument for it. As this would allow for much easier use in education (as is what I am attempting to do with it). I think it will be even easier now to push updates with SideQuest <https://sidequestvr.com/> being relatively simple to setup. I know that another (Naome <https://blog.matryx.ai/nanome-on-quest-public-beta-is-now-available-b546321…>) program is already available on the platform. But I do like your program a lot more since it is able to be used for free unlike Nanome Pricing <https://nanome.ai/pricing/> which is... as to say unappealing to public schools (such as mine). I was was also thinking (sorry if I am becoming annoying at this point) that if you do make a version of the Quest that you could make that GitHub branch available to the public. As for example while I may not be great at understanding complex protein structures I can help to make the whole experience more user friendly. Anyways if you read this far thank you for taking time from your day to read this. If you want to know who I am, my name is Blaine I am in my senior year of High School (Waynecsd <https://wh.waynecsd.org/>). I have to do a project by the end of the year where I have to present an area of study I want to pursue and I decided to research the effects of VR on the human's ability to learn and retain information. Budget..... None

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ChimeraX - XMAS pluggin modification questions
by Moya Clark, I.O. de (Isabel) 31 May '22

31 May '22

Good morning, I am a student intern at the Richard Scheltema Laboratory, and I am going to be continuing with the modification of the XMAS bundle submitted to ChimeraX recently. Right now, we are trying to extend the bundle to be able to extract specific distances between specific amino acids for two different proteins but for a molecular dynamics simulation. Either by loading a trajectory coordinates + topology files or by using the “morph” command and then “coordset slider”. So, the idea would be to extract the distances between the alpha carbons, of a set of pre-selected amino acids, in each frame of the simulation. Do you have any suggestions about any modules or methods that I should look into to extract this information in each frame? I saw there is a CooordSets class but I do not know if this would be the right way to go about it. Kind regards, Isabel de Moya Clark

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Selecting atoms outside (or inside) a density map's contour
by Mateusz Dobrychłop 23 May '22

23 May '22

Dear ChimeraX Team, I'm a structural bioinformatician working on my PhD thesis. I've been a long time user of Chimera, and I'm now using ChimeraX to create figures for my dissertation. I genuinely love both programs. Thank you for creating them. I found myself stuck trying to perform one operation in ChimeraX that is very easy to perform in Chimera. What I'm trying to do is select (and color) all atoms of an atomic model, that are located outside of a density map's contour. In Chimera, I was able to just select the model and use the shortcut "ac oa" and that was it. Unfortunately I am not able to find a way to do that in ChimeraX. I even tried to select the atoms in Chimera, then save the selected atoms as a PDB file, and then the inverted selection as a separate PDB file, and then open the two files in ChimeraX and color them separately. This could even work for a full atom representation, but does not work well for ribbon representation. That said, if the solution to my problem could be to somehow transfer the list of atoms that are outside the map from Chimera to ChimeraX, that would work for me as well. I will appreciate any tips and suggestions! Kind regards, Mateusz

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Color by RMSD for nucleic acid
by Rundlet, Emily 03 May '22

03 May '22

Hi ChimeraX developers, Is there a way to color nucleic acids by seq_rmsd? When I use the following, no atoms are colored. mm #1 to #2 matrix Nucleic showAlignment true color byattribute seq_rmsd #2 Thank you in advance for your help! -Emily ________________________________ Email Disclaimer: www.stjude.org/emaildisclaimer Consultation Disclaimer: www.stjude.org/consultationdisclaimer

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