August 2017 - Chimera-users - RBVI Mailing Lists

Hidden water molecules
by Michael Sharkey 11 Apr '19

11 Apr '19

Hi I'm trying to visualise water molecules associated with the crystal structure of an enzyme (specifically PDB ID: 1C1D). They're listed when I open the pdb as a text file using WordPad, but I can't for the life of me get them to appear on the screen when I try to visualise the structure in Chimera (v. 1.10.2). What am I missing? Thanks in advance Mike --

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Constrainted fitting
by Christoph Wigge 22 Mar '19

22 Mar '19

Dear all, I would like to fit two protein monomers that form a dimer into an em density map. I know from previous mutagenesis studies that the binding takes place with two tryptophan residues and the counterpart binding pocket. How can I set this interaction as fixed so that chimera fits the rest of the molecule according to the density map without continuously changing this part of the essential protein protein interaction? I would like to fit that interaction manually and then exclude it from the automatic procedure. Thank you very much in advance. Bests Christoph Wigge

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Error in Windows saving a session
by Joel Mackay 22 Apr '18

22 Apr '18

Hi all Have other people seen (and solved!) this error before (below)? I'm having it crop up pretty much all the time now when I try to save a session (on my Win7 machine - running Chimera 1.11.2. Thanks Joel WindowsError Exception in Tk callback Function: <function command at 0x00000000155434A8> (type: <type 'function'>) Module: <module 'chimera.baseDialog' from 'C:\Program Files\Chimera 1.11.2\share\chimera\baseDialog.pyc'> (line: 447) Args: () Traceback (innermost last): File "C:\Program Files\Chimera 1.11.2\bin\lib\site-packages\Pmw\Pmw_1_3_3\lib\PmwBase.py", line 1747, in __call__ return apply(self.func, args) File "C:\Program Files\Chimera 1.11.2\share\chimera\baseDialog.py", line 449, in command getattr(s, buttonFuncName(txt))() File "C:\Program Files\Chimera 1.11.2\share\OpenSave\__init__.py", line 264, in Save getattr(self, self.keepEquiv())() File "C:\Program Files\Chimera 1.11.2\share\chimera\baseDialog.py", line 704, in OK self.Apply() File "C:\Program Files\Chimera 1.11.2\share\OpenSave\__init__.py", line 183, in Apply self.command(1, self) File "C:\Program Files\Chimera 1.11.2\share\SimpleSession\gui.py", line 41, in _saveCB saveSession(paths[0], **kw) File "C:\Program Files\Chimera 1.11.2\share\SimpleSession\save.py", line 135, in saveSession os.rename(tsave, filename) WindowsError: [Error 32] The process cannot access the file because it is being used by another process WindowsError: [Error 32] The process cannot access the file because it is being used by another process File "C:\Program Files\Chimera 1.11.2\share\SimpleSession\save.py", line 135, in saveSession os.rename(tsave, filename) See reply log for Python traceback. ------------------------------------------------------------------------------------------------------------------------------ Professor Joel Mackay | NHMRC Senior Research Fellow Chair, Biochemistry, Cellular and Molecular Biology Cluster School of Life and Environmental Sciences THE UNIVERSITY OF SYDNEY A: School of Life and Environmental Sciences | Rm 674, Building G08 | Butlin Ave The University of Sydney | NSW | 2006 | Australia T: +61 2 9351 3906 | F: +61 2 9351 5858 | S: joelmackay E: joel.mackay(a)sydney.edu.au | W: www.mmb.usyd.edu.au/mackay/

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Chimera build instructions?
by Yuri 23 Oct '17

23 Oct '17

Are there build instructions anywhere? https://www.cgl.ucsf.edu/chimera/docs/sourcecode.html is rather discouraging, and doesn't contain a "Build" section. GNUmakefile prints "there is no default make target". Is there a script or a makefile that builds it? Thanks, Yuri

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3D-SNFG symbol representation for carbohydrate molecules
by Oliver Grant 06 Sep '17

06 Sep '17

Dear developers, The carbohydrate community has decided on a standard symbol representation for carbohydrates. The article is here <https://academic.oup.com/glycob/article-lookup/doi/10.1093/glycob/cwv091>, and the webpage is here <https://www.ncbi.nlm.nih.gov/books/NBK310273/>. Our group has created a 3D version <http://glycam.org/docs/othertoolsservice/2016/06/03/3d-symbol-nomenclature-…> of the symbols within the software VMD. Here's a video showing both versions. <http://glycam.org/docs/othertoolsservice/wp-content/uploads/sites/15/2016/0…> We have also worked with David Sehnal to implement this into LiteMol, here is an example <https://webchemdev.ncbr.muni.cz/LiteMol/Viewer/?loadFromCS=5a6z>. I wanted to reach out and see if you are interested to implement this representation within Chimera? We can discuss the details if so. Regards, Dr. Oliver Grant Associate Research Scientist Complex Carbohydrate Research Center Athens, GA, USA.

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Batch mode for Chimera
by James Starlight 03 Sep '17

03 Sep '17

Dear Chimera Users! My simple bash script loops the folder with the pdbs and open it in Chimera for pdb in ${output}/xtc_proc/*.pdb ; do name=$(basename "$pdb") echo "I am sending ${name} to Chimera!" chimera $pdb done My question - can I use with chimera some batch file which will apply the following commands to each of the loaded pdbs without opening of Chimera GUI: 1- Apply "publications-2" preset 2 - rangecolor bfactor key 2 blue 30 red 50 yellow # color pdb according to b-factor provided in the pdb file 3- make a screen-shot of the colored cartoon figure in the selected output folder. I thanks so much for the example of batch file and the syntax accepted by chimera from the linux shell. James

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B-Factor Difference Plot
by Amanda Evans Constantinides 31 Aug '17

31 Aug '17

Hello, I am plotting the B-factor differences between two similar structures. I do not understand why the plot is almost entirely on the positive side of the X-axis. If I open B factor putty models in PYMOL and in Chimera, there are some visible areas that should translate to negative B-factor differences on a quantitative plot. There is no way one structure is entirely more flexible than the other. Can you help explain this to me? Is there away to adjust the zero point to more accurately reflect these differences on the plot? Thank you, Amanda Constantinides Graduate Research Assistant Georgia State University

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Center on surface at mouse accelerator
by Daniel P Farrell 31 Aug '17

31 Aug '17

Hello, I found myself constantly needing to re-center on different regions of EM density maps, and I was originally just dropping spheres on the surface, centering on those, then deleting them. Finally I got sick of that and wrote this. It will center the window on the surface of whatever surface the mouse is currently overlaying. I found this to be a very helpful addition when looking at large EM maps, and was thinking other people might too, after using it for a while I feel as though it could be part of trunk since I use it so much. basically it would require the addition of this to standard_accelerators.py ... other accelerators.. ('zx', 'Center view on surface where mouse is located', center_on_surface_at_mouse), ... zx because it's close to where you rest your hands on the keyboard... def center_on_surface_at_mouse(): from chimera import selection, tkgui hits = [] w = tkgui.app.graphics x = w.winfo_pointerx() - w.winfo_rootx() y = w.winfo_pointery() - w.winfo_rooty() from Surface import surface_models import VolumePath.tracer as tracer hits.extend(tracer.surface_intercepts(x, y, surface_models())) xyz, model = tracer.closest_hit(hits) print(xyz) if xyz: print('cofr %f,%f,%f' % (xyz[0],xyz[1],xyz[2])) chimera.runCommand('cofr %f,%f,%f' % (xyz[0],xyz[1],xyz[2])) chimera.viewer.camera.center = xyz cheers! ~Dan

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Adding ions with Amber
by George Tzotzos 30 Aug '17

30 Aug '17

I’ve loaded the prmtop and inpcrd of a protein in complex with a ligand (named DE3). I’ve tried to add ions to the complex using the Amber Tool. I received the following message (see Reply log below). I wonder if I erred, in which case I would be grateful for any suggestions, or there’s a bug in the program. Many thanks in advance George Assigning chain ID A to 125 residues, e.g. ASP Assigning chain ID B to 125 residues, e.g. ASP Model 0 (complex.inpcrd) appears to be a protein without secondary structure assignments. Automatically computing assignments using 'ksdssp' and parameter values: energy cutoff -0.5 minimum helix length 3 minimum strand length 3 Use command 'help ksdssp' for more information. /Applications/Chimera.app/Contents/Resources/lib/python2.7/site-packages/matplotlib/axes.py:2369: UserWarning: Attempting to set identical left==right results in singular transformations; automatically expanding. left=1, right=1 + 'left=%s, right=%s') % (left, right)) Charge model: AMBER ff14SB Assigning partial charges to residue DE3 (net charge +0) with am1-bcc method Running ANTECHAMBER command: /Applications/Chimera.app/Contents/Resources/bin/amber14/bin/antechamber -ek qm_theory='AM1', -i /var/folders/hd/94rkn65x0d75wdjf_5xmblp80000gn/T/tmpJfFWs_/ante.in.mol2 -fi mol2 -o /var/folders/hd/94rkn65x0d75wdjf_5xmblp80000gn/T/tmpJfFWs_/ante.out.mol2 -fo mol2 -c bcc -nc 0 -j 5 -s 2 (DE3) (DE3) dyld: Library not loaded: /usr/local/lib/libquadmath.0.dylib (DE3) Referenced from: /Applications/Chimera.app/Contents/Resources/lib/libgfortran.3.dylib (DE3) Reason: image not found (DE3) Running: /Applications/Chimera.app/Contents/Resources/bin/amber14/bin/bondtype -j part -i ANTECHAMBER_BOND_TYPE.AC0 -o ANTECHAMBER_BOND_TYPE.AC -f ac (DE3) (DE3) Running: /Applications/Chimera.app/Contents/Resources/bin/amber14/bin/atomtype -i ANTECHAMBER_AC.AC0 -o ANTECHAMBER_AC.AC -p gaff (DE3) Total number of electrons: 104; net charge: 0 (DE3) (DE3) Running: /Applications/Chimera.app/Contents/Resources/bin/amber14/bin/sqm -O -i sqm.in -o sqm.out (DE3) Error: cannot run "/Applications/Chimera.app/Contents/Resources/bin/amber14/bin/sqm -O -i sqm.in -o sqm.out" of bcc() in charge.c properly, exit Failure running ANTECHAMBER for residue DE3 Check reply log for details

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Rainbow command
by Mark Rosenberg 28 Aug '17

28 Aug '17

Please can you provide an example of using Rainbow with Command line for a specific chain so I can see how the nomenclature works. It would be so helpful if the Chimera help files could provide more examples like this so one can adapt them to different situations. Thank you.

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Chimera-users August 2017