- Chimera-users - RBVI Mailing Lists

Set and rna commands
by pythonchemia Gazeta.pl 30 Dec '13

30 Dec '13

Hello ! I have winXP and Chimera version 1.8. I wanted to use the commands rna and set. Unfortunately, they do not work. Why? What is it? I tried to repeat the example of the User's Guide for rna command and failed. Please help me or give me examples on the set command and rna Sincerely, Janusz Grabowski

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Find pseudo 2-fold axes relating heavy and light chain
by Jian Guan 30 Dec '13

30 Dec '13

Dear all, I am trying to find pseudo 2-fold axes relating heavy and light chains in the constant domain and variable domain respectively in Fab. I tried Define Axes, it failed. And I made artificial double heavy chain, it failed again. I can only get axis which is horizontal passing through both light chain and heavy chain. It is not what I want. Can anyone help to give some clues? Thanks Jian

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Failure of energy miminization
by Ross KK Leung 30 Dec '13

30 Dec '13

In August there was a discussion entitled "Minimization and mystery nonstandard HIS atom name" and that's the exact problem supposed to have been solved last year. What I did is similar to Jason (http://www.cgl.ucsf.edu/pipermail/chimera-users/2013-August/009069.html) and unfortunately I'm unable to resolve the problem, giving that I'm using chimera 1.8.1 on a Win 7 32G RAM computer. I attach two files, one succeeded till completion while the other one failed early. What I did is simply "Structure editing", next, ok, next, .. Charges of 0.0 were assigned to the unknown atoms 1 model(s) had non-integral total charge Details in reply log No MMTK name for atom "HC1" in standard residue "ALA" Any suggestions to fix the problem is highly appreciated because Chimera is so impressive and I've been using it for many good analyses already. A pity to give up and switch to other programs at this very last stage.

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Reset surface programatically from python
by Thomas Hrabe 30 Dec '13

30 Dec '13

Hi everyone, I have this line of code where I want to load a density and export a negative surface of it: import chimera as ch mod = ch.openModels.open(‘./density.em')[0] mod.surface_levels = [-1,0] mod.display = True ch.exports.doExportCommand('WebGL', 'tmp.html’) However, the surface of the density is rendered for positive values. How can I refresh the display after I specify the surface_levels? Thanks, Thomas

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Re: [Chimera-users] [chimera-dev] writing in b-factor field
by Elaine Meng 30 Dec '13

30 Dec '13

On Dec 29, 2013, at 8:43 AM, MARIA VITTORIA CUBELLIS <cubellis(a)unina.it> wrote: > Dear sir/madam, > I have a file that associates to each amino acid of a protein A a given value v. > I would like to transfer this value to the b-factor field of the protein A the value v. I have a single value for each aminoacid N1,N2... I would like to transfer the value to each atom > > let say > > N1 C v1 > N1 CO v1 > N1 N v1 > .... > .... > N2 C v2 > N2 CO v2 > N2 N v2 > > and so on > > is it possible to this withe chimera? > thank you > > mvcubellis Dear M V Cubellis, Yes, you can do it, but another question is why do you want to do it? I'm guessing you want to color by those values. In Chimera you can assign the values to the atoms or residues directly as "attributes" and then do coloring to show those values. The B-factor from an input file is one atom attribute named bfactor, but you can create additional attributes with whatever names you wish, and color by any of them. The main work for you is to create an "attribute assignment file" which is mostly tab-separated columns with the atom (or residue) specifiers and values. The necessary format is described here, and there are also some example files: <http://www.rbvi.ucsf.edu/chimera/docs/ContributedSoftware/defineattrib/defi…> Probably the trickiest part is how to specify the residues in the file, e.g. could be something like :12.a for residue 12 in chain A. See instructions on atom/residue specification: <http://www.rbvi.ucsf.edu/chimera/docs/UsersGuide/midas/atom_spec.html#basic> Once you have created that text file, you can read it in with Define Attribute (in menu under Tools… Structure Analysis) or command defattr. <http://www.rbvi.ucsf.edu/chimera/docs/ContributedSoftware/defineattrib/defi…> <http://www.rbvi.ucsf.edu/chimera/docs/UsersGuide/midas/defattr.html> Then Render by Attribute (which may automatically appear when you create the attribute, but also is in menu under Tools… Structure Analysis) can be used to show the values with colors and/or radii: <http://www.rbvi.ucsf.edu/chimera/docs/ContributedSoftware/render/render.htm…> If you really wanted to write a PDB file with values in the B-factor column, you would still need to create an attribute assignment file as described above, but more specifically to assign an atom attribute named bfactor. Then when you use the File menu or write command to output a PDB file, your values will be in the B-factor column. See also the Attributes tutorial for examples of coloring by attribute value. <http://www.rbvi.ucsf.edu/chimera/docs/UsersGuide/tutorials/attributes.html> 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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keyboard shortcuts
by Dougherty, Matthew T 30 Dec '13

30 Dec '13

I am writing a bunch of USB-HID keyboard shortcuts for some extensions I am writing. Usually one shortcut per def. Since my decoding of HID is integrally tied to the extension, I would like to simplify all my shortcuts coming from one device to one def. As of now if I have 100 button commands I have to 1) register 100 shortcuts, 2) create 100 defs, 3) do corresponding stuff in my extension. I would prefer to call one def that passes the actual keyboard string to my extension, thereby simplifying my user accelerators to just registration. How do I get the string within my keyboard shortcuts python file? thanks, Matthew Dougherty National Center for Macromolecular Imaging Baylor College of Medicine

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display of improper peptide bond
by Tatiana Domitrovic 30 Dec '13

30 Dec '13

Hi, I am trying to get rid of an improper bond that chimera is displaying between two nearby segments that are actually cleaved. The bond is distorted, creating long CACB bonds if B-spline mode is active. I tried to turn off the auto-chaining, but didn’t work. Because PYmol can properly display these segments as independent polypetides, I was wondering if there is other adjustment that I can try before manually deleting the bond. The PDB is 1ohf and the bond is between residue 570 and 571. Cheers,

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Failure of energy miminization
by Ross KK Leung 29 Dec '13

29 Dec '13

In August there was a discussion entitled "Minimization and mystery nonstandard HIS atom name" and that's the exact problem supposed to have been solved last year. What I did is similar to Jason (http://www.cgl.ucsf.edu/pipermail/chimera-users/2013-August/009069.html) and unfortunately I'm unable to resolve the problem, giving that I'm using chimera 1.8.1 on a Win 7 32G RAM computer. I attach two files, one succeeded till completion while the other one failed early. What I did is simply "Structure editing", next, ok, next, .. Charges of 0.0 were assigned to the unknown atoms 1 model(s) had non-integral total charge Details in reply log No MMTK name for atom "HC1" in standard residue "ALA" Any suggestions to fix the problem is highly appreciated because Chimera is so impressive and I've been using it for many good analyses already. A pity to give up and switch to other programs at this very last stage.

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Sir, i donot want to recieve antomately letter from chimera, can you remove my email adress from your email list..
by 一波 28 Dec '13

28 Dec '13

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How to get central cross section which pass through two asigned cross axis
by Jian Guan 27 Dec '13

27 Dec '13

Dear all, I have a density map of virus-Fab complex. I want to make a central cross section which pass through the Fab pseudo-symmetry 2-fold axis. I have measure the angle of Fab relative to the capsid. Hope someone can help me. Thank you so much. Sincerely yours, Jian -----Original Message----- From: chimera-users-bounces(a)cgl.ucsf.edu [mailto:chimera-users-bounces@cgl.ucsf.edu] On Behalf Of chimera-users-request(a)cgl.ucsf.edu Sent: 2013年12月24日 15:00 To: chimera-users(a)cgl.ucsf.edu Subject: Chimera-users Digest, Vol 128, Issue 25 Send Chimera-users mailing list submissions to chimera-users(a)cgl.ucsf.edu To subscribe or unsubscribe via the World Wide Web, visit http://plato.cgl.ucsf.edu/mailman/listinfo/chimera-users or, via email, send a message with subject or body 'help' to chimera-users-request(a)cgl.ucsf.edu You can reach the person managing the list at chimera-users-owner(a)cgl.ucsf.edu When replying, please edit your Subject line so it is more specific than "Re: Contents of Chimera-users digest..." Today's Topics: 1. Re: saving coords from script (Eric Pettersen) ---------------------------------------------------------------------- Message: 1 Date: Mon, 23 Dec 2013 15:59:16 -0800 From: Eric Pettersen <pett(a)cgl.ucsf.edu> To: Tetsuro Fujisawa <fujisawa(a)gifu-u.ac.jp> Cc: "chimera-users(a)cgl.ucsf.edu Mailing List" <chimera-users(a)cgl.ucsf.edu> Subject: Re: [Chimera-users] saving coords from script Message-ID: <04B15E0C-844B-4594-8AE6-760588744D85(a)cgl.ucsf.edu> Content-Type: text/plain; charset="windows-1252" On Dec 20, 2013, at 1:58 AM, Tetsuro Fujisawa wrote: > Hi, > > I found some strange behavior in saving pdb file by script file. > I tried to modify the orientation of pdb file ?tst.pdb? (#1) in reference to axis coordinate (#0), then save the atomic coordinates in pdb file. > When I typed in the commands through either command line window or IDLE, transformed coordinates were saved. It worked fine. However, the exact identical commands (inside the brancket) or lines (rc(?..?)) were run by script file shown in below, the untransformed coordinates were saved. This is also the case for ?Midas.write method?. > I wondered this might be a bug. > > Regards, > Tetsuro > > Sample.py: > ---------------------------------------------- > from chimera import runCommand as rc > > rc('open axis.bild') > rc('open tst.pdb') > rc('rock y 60 1 center #1 coord #0 models #1') # orientation of > tst.pdb was modified > rc('focus') > rc('write relative #0 #1 tstA.pdb') > # write current coordinates to tstA.pdb rc('open tstA.pdb') # opened > tstA has original untransformed orientation > ----------------------------------------------- Hi Tetsuro, The issue is that unlike using the command line or IDLE or running a chimera-command script, no frames get drawn during the execution of a Python script unless explicitly requested and therefore the "rock" command in your script doesn't actually do anything until after the entire script runs, and by that time your coordinate file has already been written. To get the rock command to complete before proceeding with the rest of the script you need to append "; wait" or "; wait 1" (since you are rocking for 1 frame) to the end of your rock command. --Eric Eric Pettersen UCSF Computer Graphics Lab http://www.cgl.ucsf.edu

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