August 2024 - ChimeraX-users - RBVI Mailing Lists

initial dark mode support
by Greg Couch 17 Dec '24

17 Dec '24

FYI, the ChimeraX daily build now has dark mode support. So if you set your desktop to use dark mode, ChimeraX should follow. It's a work in progress, and it depends on developer's making their code dark mode aware (eg., icons may need to be modified), but if you notice any black text on a dark background, please let me know. -- Greg

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ChimeraX 1.8 release
by Elaine Meng 10 Dec '24

10 Dec '24

UCSF ChimeraX version 1.8 has been released! ChimeraX includes user documentation and is free for noncommercial use. Download for Windows, Linux, and MacOS from: https://www.rbvi.ucsf.edu/chimerax/download.html Updates since version 1.7 (Dec 2023) include: - show worm depictions of attribute values (B-factor, conservation, etc.) using Render by Attribute tool or "cartoon byattribute" command - show attribute values with atomic radii using Render by Attribute or "size byattribute" - Select by Attribute graphical interface - Join Models generalized to any covalent bond (not just peptide) - show multiple alternate locations simultaneously with "altlocs show" - "pbond" command to create arbitrary pseudobonds - "measure contactarea" to report the area of one surface within a cutoff distance of another - Segmentations tool for interactive manual segmentation in 2D slice views, 3D (desktop), or 3D (VR) can be applied to any volume data, not just medical images; several fixes and ergonomic improvements including icons to assign/deassign mouse and VR hand-controller modes with a single click - set up and analyze batch AlphaFold predictions to search for protein-protein interactions (commands for advanced users who can run ColabFold directly on Linux) support for: - reading predicted aligned error (PAE) data from AlphaFold 3 - reading docking results from MOE - fetching atomic structures and maps from PDB-REDO - fetching/display of PDB NMR-STAR restraints For details, please see the ChimeraX change log: https://www.rbvi.ucsf.edu/trac/ChimeraX/wiki/ChangeLog On behalf of the team, Elaine ----- Elaine C. Meng, Ph.D. UCSF Chimera(X) team Resource for Biocomputing, Visualization, and Informatics Department of Pharmaceutical Chemistry University of California, San Francisco

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Modelling of missed loop fragments in multi-chain structure
by Enrico Martinez 18 Nov '24

18 Nov '24

Dear Chimera-X users! I need to predict missed loop fragments in a part of a multi-chain complex corresponded to GPCR bound to heteromeric G-protein (pdb id 8HTI). In this structure the chain A (a subunit of the G-protein) contain missed loop fragments. So the following commands were executed in command line to reconstruct the entire structure of this subunit: open 8hti seq chain /A ui tool show "Model Loops" modeller refine 1/A:1:internal-missing numModels 5 fast false adjacentFlexible 1 protocol standard which very slowly produces 5 models of the chain A. The problem was that the modeller considered the chain A in isolation from the rest of the structure and predicted loops overlapped with other chains of the G protein. Would it be possible to reconstruct the missing fragments in the chain A considering also the presence of other chains to build the full complex ? Many thanks in advance Enrico

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color bfactor by alphafold palette
by Agnieszka Obarska 11 Nov '24

11 Nov '24

Hi, I’ve just would like to let you know that we’ve noticed recently that alphafold palette in ChimeraX is not consistent with original AlphaFold coloring. Please see the slide attached. On the left there is a model colored by the “color bfactor pal alpha” command in ChimeraX while on the right there is the same model colored according to AlphaFold coloring scheme. Best, Agnieszka

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Ribbon style editor
by Alessio Nocentini 09 Sep '24

09 Sep '24

Hello, I have been an academic user of chimera for years. I have just downloaded chimerax but I cannot find the ribbon style editor. Can you please help? Best regards Alessio -- Dr. Alessio Nocentini University of Florence Neurofarba Department Via Ugo Schiff 6, 50019 - Sesto Fiorentino (Firenze), Italy Phone: +39-055-4573685 *NEUROFARBA Dipartimento di **ECCELLENZA 2023-2027*

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AlphaFold PAE plot not generated
by Catrin McHugh 30 Aug '24

30 Aug '24

Good morning Having successfully generated a PAE plot (and coloured the model accordingly) with data generated by AF3, I am getting an error message when I try to do the same using a JSON file generated by ColabFold for AF2. The error message is: 'is not AlphaFold predicted aligned error data, expected a top level list". I attach the JSON file, and the relevant structure PDB. Many thanks in advance Catrin

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Random residue colors?
by Daniel Asarnow 30 Aug '24

30 Aug '24

Hi all, In the color command documentation, it says 'color random' can per atom or per residue. How can random residue colors be specified? I can only get random atom colors. Thanks! -da

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CIMERAX 64BIT FOR WIN 10
by Lee, Yong Sok (NIH/NIAID) [E] 29 Aug '24

29 Aug '24

I AM LOOKING A FOR A 64BIT VERSION OF CHIMERAX FOR WINDOWS 10. TRED DOWLOANDING AND INSTALLING CHIMERAX 1.8 BUT IT WOULD NOT LAUNCH ON MY WINDOWS 10 64 BIT SYSTEM. LET ME KNOW IF YOU HAVE A SOLUTION FOR THIS ISUUE. LOOKING FORWARD TO HEARING FROM YOU.

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Invitation to conduct a UCSF Chimera Workshop at Purdue University
by Ferdausi, Nourin 29 Aug '24

29 Aug '24

Dear Team, I hope this email finds you well. My name is Nourin Ferdausi and I am a graduate student at the Department of Biological Sciences in Purdue University. My colleague, Priyanka Naik (cc’d here) and I are writing to you on behalf of the Structural Biology and Biophysics Club (SBBC). We are hoping to organize a virtual workshop focused on UCSF Chimera, and we would be honored if one of your team members could conduct this workshop. The graduate students and researchers of our structural biology group use a wide variety of experimental approaches like cryo-electron microscopy and X-ray crystallography for determining molecular structures. Consequently, the Chimera software is integral to our research, and we believe your insights would be of great impact to our community. We are flexible with the format of this virtual workshop, which is tentatively scheduled for mid-September; however, we are open to adjusting the date based on your availability. Your participation will provide our members with a unique opportunity to learn directly from a developer of UCSF Chimera. Please let me know if we can have a quick Zoom call to discuss the event in detail. We look forward to your reply at your earliest convenience! Thank you, Nourin Ferdausi Ph.D. Candidate, Noinaj Lab Supporting officer, Structural Biology and Biophysics Club Department of Biological Sciences Purdue University Hockmeyer Hall of Structural Biology West Lafayette, IN-47907-2054

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Re: [Chimera-users] Finding SASA for individual residues
by Elaine Meng 29 Aug '24

29 Aug '24

Hi Ale, In the future please use chimerax-users(a)cgl.ucsf.edu <mailto:chimerax-users@cgl.ucsf.edu> (CC'd here) for ChimeraX questions. This chimera-users@cgl address is for Chimera, which is a different program, and I don't want to confuse the other users. Everybody, this answer is for ChimeraX: I believe you are misunderstanding how "measure sasa" works. It will actually enclose the specified atoms in a surface, so if you say "measure sasa :12" that surface will only be around residue 12 and ignore all the other atoms. I am guessing that you really want the SASA of the aromatic rings in the context of the surface that goes around the whole protein, not for a bunch of individual bubbles drawn around each aromatic ring. In that case, your commands are wrong. Instead you want something like: measure sasa protein sum :trp,tyr,phe & aromatic-ring See "measure sasa" help for description of how it works: <https://rbvi.ucsf.edu/chimerax/docs/user/commands/measure.html#sasa> I hope this helps, Elaine ----- Elaine C. Meng, Ph.D. UCSF Chimera(X) team Resource for Biocomputing, Visualization, and Informatics Department of Pharmaceutical Chemistry University of California, San Francisco > On Aug 29, 2024, at 4:16 AM, alessandro.strofaldi--- via Chimera-users <chimera-users(a)cgl.ucsf.edu> wrote: > > Hi Elaine, > > I'll reply to this post for my question cause the title seems appropriate. > I've a one-chain protein and I simply want to calculate the SASA of the aromatic-ring of all TRP,TYR and PHE of the protein using ChimeraX. > > This is the log: > measure sasa /A > Solvent accessible area for /A = 22276 > measure sasa /A:trp & aromatic-ring > Solvent accessible area for /A:trp & aromatic-ring = 1824.9 > measure sasa /A:phe & aromatic-ring > Solvent accessible area for /A:phe & aromatic-ring = 3339.6 > measure sasa /A:tyr & aromatic-ring > Solvent accessible area for /A:tyr & aromatic-ring = 3977.3 > > But the I tried to get the sum: > > measure sasa /A:trp,tyr,phe & aromatic-ring sum :trp,tyr,phe > Solvent accessible area for /A:trp,tyr,phe & aromatic-ring = 7683.3 > Solvent accessible area for :trp,tyr,phe (285 atoms) of /A:trp,tyr,phe & aromatic-ring = 7683.3 > > Which is different from the sum of the values I got before. I think I'm missing something basic on SASA calculations... > Also, from your answer to Prathvi, those numbers should be squared Agstrom. Do these number make sense? For a single residue (measure sasa:263, which is a surface-exposed Tyrosine) I got 331.95. Those values are similar to what Prathvi got so am I doing the same mistake? I was expecting, for a single residue something like two order of magnitude less. > You said ".. then it will make a surface that only encloses that one residue, with area 292 as you said. I'm pretty sure that is NOT what you want. Instead you want tthe surface of the whole protein (or maybe one chain) and then the area of the residue given that larger surface. " Does this means that with the commands I typed ChimeraX "Isolates" the residue and calculate the SASA as if it was not included in the protein? > Anyway, I think it is clear I'm an unexpert user so If there is any tutorial about SASA on ChimeraX (could not find those, only for Chimera), please, feel free to suggest. > > Thank you!! > Best, > Ale

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