- ChimeraX-users - RBVI Mailing Lists

Cα distance per residue in alignment
by Michael Habeck 28 Nov '22

28 Nov '22

Dear ChimeraX forum, I'm interested in getting the distance between Cα for all residues in an alignment. I've noticed that the Cα RMSD values in the txt file obtained from the header of the sequence alignment created by matchmaker via sequence header rmsd save are different from the distances measured using the rmsd or distance command. The Cα distance measured is approx. 41% higher across the entire alignment than in the saved output. When selecting a pair of aligned residues from the alignment viewer, the distance shown does not match the one in the output file but the distance measurement. I've attached a file with the respective distances for the alignment of chains A in 3c4f and 3gqi as an example. Not sure if this is a misunderstanding from my side or a bug, yet I'd greatly appreciate a clarification of the differences. With thanks in advance and best regards, Michael

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Align with specific atoms (but against all other molecules)
by Kim, Doo Nam 28 Nov '22

28 Nov '22

Hi, I’ve used align #2/X:1 @CA,O,C,N to #1/X:1 @CA,O,C,N align #3/X:1 @CA,O,C,N to #1/X:1 @CA,O,C,N align #4/X:1 @CA,O,C,N to #1/X:1 @CA,O,C,N … to align #2 molecule against #1 molecule with backbone atoms #3 molecule against #1 molecule with backbone atoms #4 molecule against #1 molecule with backbone atoms etc… However, how can I align all rest molecules (e.g. #2~#100) against #1 molecule with backbone atoms at once in chimeraX? I’ve used align all toAtoms #1 matchAtomNames true align all toAtoms #1 matchNumbering true to align all molecules to #1 molecule at once. However, with this command, I cannot specify to use backbone atoms (e.g. CA,O,C,N) only when aligning. I think that there should a 1 line command that aligns all molecules with specific atoms only or there is chimeraX equivalent python script as from chimera import runCommand as rc # use 'rc' as shorthand for runCommand from chimera import replyobj # for emitting status messages Best, Doo Nam

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input delay on one computer and only for ChimeraX
by Barbara S Holme 28 Nov '22

28 Nov '22

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Re: [chimerax-users] [Chimera-users] Writesel command in chimeraX
by Elaine Meng 27 Nov '22

27 Nov '22

Hi Prathvi, Please use the chimerax-users(a)cgl.ucsf.edu address to ask ChimeraX questions (instead of chimera-users(a)cgl.ucsf.edu) so that users will not be confused about which program we are discussing. In ChimeraX you can use the "info" command to report the selection to the Log, as detailed in this previous post. <https://www.rbvi.ucsf.edu/pipermail/chimerax-users/2022-July/003963.html> "info" help <https://rbvi.ucsf.edu/chimerax/docs/user/commands/info.html> It does not have an option to save a file. Instead you have to save the ChimeraX Log in another step. You can use "log clear" before you use "info" and then "log save" to save to HTML file. "log" help <https://rbvi.ucsf.edu/chimerax/docs/user/commands/log.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 Nov 26, 2022, at 5:04 AM, Prathvi Singh via Chimera-users <chimera-users(a)cgl.ucsf.edu> wrote: > > Hi Elaine, > > Is the writesel command available in chimeraX because I could not find it in the Actions menu? > If not, then is any equivalent available apart from the command which saves selection as a new PDB file? > > Thanks once again in advance

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how to remove axes?
by Francisco Murphy Pérez 26 Nov '22

26 Nov '22

After loading a mtz file, 3 axes appear in the middle of the screen. How do I remove them? Thanks

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Display sequence alignment from structure alignment
by James H Naismith 25 Nov '22

25 Nov '22

In Chimera I can sort of print out a sequence alignment based on structural superposition. (Match-align) I can make a very nice structural superposition of very unrelated proteins with matchmaker, all I want to do is print out the resulting sequence alignment (where residues are with y A of each other) Any help gratefully received. With best wishes Jim Division of Structural Biology, Roosevelt Drive, Oxford, OX3 7BN james.naismith(a)strubi.ox.ac.uk Pronouns: he, him, his

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Opening .xyz file in ChimeraX
by Carina Luo 23 Nov '22

23 Nov '22

Hello, I am trying to open an .xyz file in ChimeraX. I installed SEQCROW (1.5.9) as prompted, but ChimeraX still says "Opener for format 'XYZ file' is not installed; see log for more info." Here is the output I got when I installed SEQCROW (1.5.9): Downloading bundle SEQCROW-1.5.9-py3-none-any.whl Errors may have occurred when running pip: pip standard error: --- [notice] A new release of pip available: 22.2.2 -> 22.3.1 [notice] To update, run: C:\Program Files\ChimeraX\bin\ChimeraX.exe -m pip install --upgrade pip --- pip standard output: --- Looking in indexes: https://pypi.org/simple, https://cxtoolshed.rbvi.ucsf.edu/pypi/ Processing c:\users\user\downloads\seqcrow-1.5.9-py3-none-any.whl Requirement already satisfied: jinja2 in c:\program files\chimerax\bin\lib\site-packages (from SEQCROW==1.5.9) (3.1.2) Collecting Send2Trash Downloading Send2Trash-1.8.0-py3-none-any.whl (18 kB) Requirement already satisfied: ChimeraX-Core<=1.5,>=1.2 in c:\program files\chimerax\bin\lib\site-packages (from SEQCROW==1.5.9) (1.5rc202210312311) Requirement already satisfied: scipy in c:\program files\chimerax\bin\lib\site-packages (from SEQCROW==1.5.9) (1.9.0) Requirement already satisfied: psutil in c:\program files\chimerax\bin\lib\site-packages (from SEQCROW==1.5.9) (5.9.1) Requirement already satisfied: MarkupSafe>=2.0 in c:\program files\chimerax\bin\lib\site-packages (from jinja2->SEQCROW==1.5.9) (2.1.1) Requirement already satisfied: numpy<1.25.0,>=1.18.5 in c:\program files\chimerax\bin\lib\site-packages (from scipy->SEQCROW==1.5.9) (1.23.1) Installing collected packages: Send2Trash, SEQCROW Successfully installed SEQCROW-1.5.9 Send2Trash-1.8.0 Could you please help me figure out what I still need to do in order to successfully open .xyz files in ChimeraX? Sincerely, Carina

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How do you submit a sequence text file to BLAST/Modeller in ChimeraX?
by Ralph Loring 23 Nov '22

23 Nov '22

Hi, When I was using Chimera and wanted to use Modeller, I would go to sequence/Blast, paste in my sequence text file, Blast and then pick homologous structures and then connect to Modeller. Both Blast and Modeller appear to be present in ChimeraX, but I can't see how to enter my text file. Is everything supposed to go to AlphaFold now? Are there any tutorials on how to use Modeller in ChimeraX? Thanks! P.S. Hope you have a Happy Thanksgiving! I'm not planning on doing anything with this until after the holidays, so don't rush in answering. Ralph Lorini Ralph H. Loring Associate Professor of Pharmacology Department of Pharmaceutical Sciences 166 TF Northeastern University 360 Huntington Avenue Boston, MA 02115 USA 617-373-3216 office 617-373-8886 fax r.loring(a)northeastern.edu

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Developing a ChimeraX bundle - accessing programmatically ChimeraX(GUI open) session
by Stylianos Iliadis 23 Nov '22

23 Nov '22

Hello, I would like to develop a small bundle-plugin for automatically annotating residue labels in protein structures. I tried to access ChimeraX via command line when ChimeraX was running (GUI open) with an opened protein structure in order to study the structure objects hierarchy( chain ->residue ->atoms). This would help me understand it better and code accordingly. Unfortunately, I didn’t manage to do so. Could you please suggest me a way, a page or terminal where I could read more about the internal structure of ChimeraX and if possible to programmatically access a session when it’s running in ChimeraX. Kind regards, Stel Iliadis

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suggestion
by Hassan, Sergio (NIH/NIAID) [E] 22 Nov '22

22 Nov '22

Hello, I recently requested via Phil Cruz the 'tile' command, which I learned it was recently introduced. I have been using it successfully. However, there are two points I would like to bring to your attention (I asked Phil to ask you, but not sure he reached out) 1) when a session is saved as .cxs and I quit the program, after opening it again, the most important feature of the 'tile' command (rotations around each own axis) is lost. The tile distribution is still there, but now the entire thing rotates around a common axis. I need to apply 'tile' again to make it work, but this resets all the modifications I made in the saved session (these modifications include those in point 2 below). 2) any chance to add an argument to the 'tile' command so that the default spatial distribution, which assigns a 'distance' between near neighbors, can be adjusted with, say, 'zoom in" or "zoom out" or crowd in/out? I noticed the default puts each panel too far away from its neighbors for my taste, so I need to "move" them to make them look closer to one another. thanks s _____________________________________ Sergio A. Hassan https://bioinformatics.niaid.nih.gov/cmm/ BCBB/NIAID/NIH/DHHS 301 761 7221 (office) 301 741 5579 (mobile)

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