April 2014 - Chimera-users - RBVI Mailing Lists

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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volume planes tool
by Jeff Triffo 22 Jun '16

22 Jun '16

hi folks, anyone know if the volume plane tool will support arbitrary orientation of the plane any time soon? -Jeff

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script
by Schulz-Gasch, Tanja 22 May '14

22 May '14

Hi there, I hope you could help me with a little script. I am pretty sure, that something must exists already;-) I need to rotate around the y-axis in 2 degree steps for a total of 44 degree and at each step export a high res graphic. Rotation of the camera/view (keeping the look-at point) would be preferable compared to rotation of the object. Anything out there like this??? Thanks for your help, Tanja -- *Dr. Tanja Schulz-Gasch *Head of Communications & Operations, pRED Basel Bldg 69, 308 Grenzacherstrasse 124 4070 Basel Switzerland Mobile: +41 (0) 79 578 4672 Work: +41 (0) 61 688 8309 Email: tanja.schulz-gasch <http://goog_20899098>@roche.com Web: www.roche.com *Confidentiality note: This message is intended only for the use of the named recipient(s) and may contain confidential and/or privileged information. If you are not the intended recipient, please contact the sender and delete this message. Any unauthorized use of the information contained in this message is prohibited.*

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Re: [Chimera-users] Display a spider volume data in a specific orientation
by Elaine Meng 08 May '14

08 May '14

Hi Zongli, This is not my area of expertise (our expert is currently out of town) -- at first I thought you could use "Transform Molecule Coordinates" (under Tools... Movement), but now I see that it works only on atomic structures rather than maps: <http://www.cgl.ucsf.edu/chimera/docs/ContributedSoftware/transform/transfor… > It only works on molecular structures because it actually changes the atomic coordinates, without changing the model transformation. I've figured out one workaround, but it is both crazy and slightly tedious: (1) open your map (say as model 0). (2) open any atomic-resolution structure, it doesn't matter what, and open it twice -- now you have three models. Don't move them separately from the map (yet). Let's say the atomic structures are models 1 and 2. (3) use "Transform Molecule Coordinates" with desired Euler angles and shift on one copy of the atomic structure (say model 1). (4) use the match command to superimpose the other copy of the atomic structure on the one that was transformed: match #2 #1 (the command can use the whole models since they should have exactly the same atoms) (5) use the matrixcopy command to apply the transformation matrix of the second copy of the atomic structure to the map: matrixcopy 2 0 You might think "why do I need two copies of the atomic structure? can't I just transform one copy and then use matrixcopy?" ... in fact that's what I tried first, but after it didn't work, I realized it was because the Transform tool works by changing the coordinate values and not the stored matrix of the model. It is necessary to match the second copy to generate a corresponding matrix, and then matrixcopy can be used. I'm CC-ing the chimera-users(a)cgl.ucsf.edu list in case other Chimera users have suggestions. Our expert Tom G should be back next week and he might also have ideas. In general, it's better to send Chimera questions to that mailing list instead of just me, because I could be away from work or (like now) lacking a good answer! 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 On Apr 7, 2010, at 11:51 AM, Li, Zongli wrote: > Hi Elaine, > I have a spider volume data (or mrc density map) from which I got a > serious 2D projections. I have the Euler angles for each projection. > Is there a way in Chimera that I can use those Euler angles to > display the 3D spider volume data (or mrc density map) in a specific > orientation that corresponding to that 2D projection? > Thank you very much in advance. > Best, > Zongli > > **************************************** > Zongli Li, Ph.D. > > Howard Hughes Medical Institute > Department of Cell Biology > Harvard Medical School > C Building, Room 420B > 240 Longwood Avenue > Boston, MA 02115 > > Tel: 617-432-4095 (Office) > 617-432-4708 (EM Suite) > 617-432-4091 (Computer room) > Fax: 617-432-1144 > Email: zongli_li(a)hms.harvard.edu > *************************************** >

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A question on tunnelling chimera through ssh between a linux server and OSX client
by Miguel Ortiz Lombardía 30 Apr '14

30 Apr '14

Hi all, I understand that this is not a typical use of chimera, so I don't expect much support, but I would appreciate if someone can give me a clue to solve the issue... We have a GNU/Linux server (Debian wheezy) with some EM software installed on it. One of these programs calls at some point chimera to show something on which the user has to act upon (or just check, not sure, I'm not the user as you've guessed) This machine is accessed from client OSX machines via ssh. All permissions are set so X11 is seamlessly tunnelled between them (checked with many graphical programs) Now, for a OSX client running on 10.6.8 (snow leopard) and using Apple's X11 the whole process works without problems. But for a OSX on 10.7.5 (lion) with a parallel installation of Apple's X11 and Xquartz 2.7.5 the first small window opens and then the chimera process hangs (it can be killed via Ctrl-C, which returns the control to the program that launched chimera and things can proceed, though without the information provided by chimera) If I connect to the Linux server from the lion machine and directly execute chimera I make a different observation: the first small window opens but then chimera crashes leaving this error in the terminal: Error of failed request: GLXBadCurrentWindow Major opcode of failed request: 149 (GLX) Minor opcode of failed request: 5 (X_GLXMakeCurrent) Serial number of failed request: 1360 Current serial number in output stream: 1360 Now, I would appreciate any clues on the meaning and possible solution of this error or at least any directions on how to properly remove both Apple's X11 and Xquartz (they are supposed to be able to work side-by-side but I presume that a possible source of problems could arise from some conflict between them) AND re-install them to test them in a fresh install. Downgrading the lion machine to snow leopard does not seem to be an option... Thank you! Cheers, -- Miguel Ortiz Lombardía Architecture et Fonction des Macromolécules Biologiques (UMR7257) CNRS, Aix-Marseille Université Case 932, 163 Avenue de Luminy, 13288 Marseille cedex 9, France Tel: +33(0) 491 82 86 44 Fax: +33(0) 491 26 67 20 mailto:miguel.ortiz-lombardia@afmb.univ-mrs.fr http://www.afmb.univ-mrs.fr/Miguel-Ortiz-Lombardia

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Preparation of the protein-ligand system for the amber simulation
by James Starlight 30 Apr '14

30 Apr '14

Dear Chimera Users, I wounder to know if it's possible to use combination of the amber ff with the cgenff for the both parametrization of the small ligands in complex with the proteins using amber tools built in Chimera's? Does it possible to use some scripts instead of GUI for such tasks ? I'll be thankfull for some tutorial or example Thanks for help, James

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multi-channel solid rendering
by Nick Walter 29 Apr '14

29 Apr '14

Hello, I've been attempting to create a movie in Chimera using multiple data files in solid style volume rendering, and I have been running into an issue where Chimera consistently shows the last channel to be loaded on top, regardless of the spacial position of the data with respect to the other solid channels. I found this message ( http://plato.cgl.ucsf.edu/pipermail/chimera-users/2011-May/006329.html) which explains that multi-channel solid rendering was removed in 2008. I was wondering, if there are any plans to reinstate this feature, or if you were aware of any work-arounds that would work well for creating movies. Thank you for your time, Nick Walter

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related with Fit in map option
by SRDA.DRAKULIC.599589 29 Apr '14

29 Apr '14

Hi, I have a question related to Fit in Map option and how to evaluate subsequently given results. I have a EM map at 19 ang. resolution of protein at yet non-characterised activity state, and there are two atomic structures of homologue of that protein, at clenched and open, active state. I would like to relate that state to one of the atomic structures, thus, both of them were fitted in my EM map and for the clenched state I got following values: cross correlation: 0.8447; average map value 9.526; and number of atoms outside the contour: 1709/7621 (or 22.42%) For the open state: cross correlation: 0.8385; average map value 9.085; and number of atoms outside the contour: 2064/8124 (or 25.42%) Are those differences big enough to say with certainty that my protein is at conformation similar to the clenched one or due to the EM map resolution this can not be said. Sincerely, Srdja Drakulic

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Saving ribbons as PDBs?
by Maja Divjak 29 Apr '14

29 Apr '14

Hello Chimera Gurus, Is there a way to save ribbon structures as PDBs for import into Maya? I've found only the surface structures are saved in the PDB, even though I am working with the ribbon structure in chimera initially. If there is a way to do this, I would be mightily pleased! I used to export chimera domains as vrml files and then convert them to maya files and both the ribbon and surface structures would be included. You can reply to my work email at divjak.m(a)wehi.edu.au if you prefer. Thank you so much and best wishes, Maja Divjak, PhD Biomedical Animator Walter and Eliza Hall Institute of Medical Research

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select zone & rename script
by Michael Garton 29 Apr '14

29 Apr '14

Hi all, Can anyone show me a good way to select all residues that are <2Å from zinc atoms, then rename any selected CYS and HIS, to CYM and HIN respectively ... I'm trying to write a script to do this on ~300 files. Thanks!! Mike Here's what I have so far import os from chimera import runCommand as rc from chimera import replyobj # gather the names of .pdb files in the folder file_names = [fn for fn in os.listdir(".") if fn.endswith(".pdb")] # loop through the files, opening, processing, and closing each in turn for fn in file_names: replyobj.status("Processing " + fn) # show what file we're working on rc("open " + fn) rc("select :ZNB zr<2") rc("writesel "reslist + fn") rc("close all") rc("stop now")

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Chimera-users April 2014