- Chimera-users - RBVI Mailing Lists

savepos
by Dougherty, Matthew T 03 Jun '15

03 Jun '15

Hi, I have been automating the creation of positions using python scripts. Something relatively simple like p001, p002, etc. When I examine the positions using the python commands from Midas import positions pnames = positions.keys() at first things appear as I would expect, but later the sequence changes relative to the index, why is that? for example, using this to print the positions pnames = positions.keys() i=0 for pname in pnames: print i,pnames[i] i=i+1 I get these results: savepos p000 savepos p001 0 p000 1 p001 (as expected) savepos p002 0 p000 1 p001 2 p002 (as expected) savepos p003 0 p000 1 p001 2 p002 3 p003 (as expected) savepos p004 0 p004 1 p000 2 p001 3 p002 4 p003 (not as expected) savepos p005 0 p004 1 p005 2 p000 3 p001 4 p002 5 p003 (not as expected) I would expect pnames[0] to correspond to the first position created, pnames[1] to the second posiiton created, etc., assuming no ~savepos used. Want to create a situation where the default names would be pxxx, but could later be altered to more meaningful names but maintain the order of creation, or getting a session file from someone I would use their position names and tack on my default names to the end of the position list. Matthew Dougherty National Center for Macromolecular Imaging Baylor College of Medicine ===========================================================================

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to color EM map
by Smith Liu 03 Jun '15

03 Jun '15

Dear All, Suppose I have an EM map for a protein complex of 4 subunits. I have fitted them in chimera. Will you please tell me how to give each part of the map a different color based on the subunits? For example, for subunit A, B,C, D part of the EM map, how to color the map accordingly in blue, red, yellow and purple? Smith

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volume viewer/Data menu
by Dougherty, Matthew T 03 Jun '15

03 Jun '15

Hi, What is the pattern for the sequence of the Data list? Is there a way to sequence it the same as the Model Panel? Matthew Dougherty National Center for Macromolecular Imaging Baylor College of Medicine ===========================================================================

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Unable to Change Lighting of Side Chains / Atoms
by David Nelson Bunck 03 Jun '15

03 Jun '15

Hello, Recently, for some reason, the settings changed on Chimera such that the atoms and side chains do not change color when I try to change the lighting settings. Thus when I get the protein (in ribbon format) to look appealing and shiny, the metal atoms in the protein remain black. Changing colors or lighting do not make any difference. The same is true for the side chains as well. This also occurs on several different sequences, so it is not just the one file. Sorry for the seemingly trivial question, but I have poked around for a while at the different settings and can't seem to find how to undo this change. Thanks for your help! david -- david bunck bunck(a)caltech.edu (626) 395-8919 Postdoctoral Scholar Heath Research Group Division of Chemistry and Chemical Engineering California Institute of Technology

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Cage maker
by Anindito Sen 03 Jun '15

03 Jun '15

Dear All, Is it possible to generate a synthetic 3d density map of hexagons and/ pentagons using the Cage building option with file extension like mrc or spi or pif ( the usuals). If so, how to save it in such a format ? Thanks Andy Sent from my iPad

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H-bond angle criteria (cut-off)
by Felipe Vasquez 03 Jun '15

03 Jun '15

Hi, I am using the H-bond function in UCSF Chimera and I noted that the relaxed parameter for angle criteria is 20 by default. However, since that I have no hydrogen atoms in the pdb structure, I assume that the angle theta (donor-hydrogen-acceptor) cannot be used by Chimera as an angle criteria, and so the psi or phi angles might be used instead. Which angle is actually used in the relaxed parameters? And most important, what is the default value of that angle (angle minus relaxing value)? Thanks in advance for your help. Best regards, *Andrés Felipe Vásquez J., BSc, MSc.* Grupo de Fisiología Molecular Subdirección de Investigación Científica y Tecnológica Dirección de Investigación en Salud Pública Instituto Nacional de Salud Avenida calle 26 No. 51-20 - Zona 6 CAN +57 (1) 2207700 ext. 1419 Bogotá, D.C., Colombia

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Re: [Chimera-users] Mouse control
by Elaine Meng 03 Jun '15

03 Jun '15

Dear Prof. Szabo, I can’t see your image, but the following might help: menu: Actions… Focus - OR - command: focus … if you don’t have anything selected, either of the above should center and resize to frame all of the displayed stuff in the main window. By “selected” I mean when you Ctrl-click on something in the main window, it is highlighted with green outline. If you have something selected, you can use that same menu action to focus only on the selected part (the corresponding command would then be “focus sel”). <http://www.rbvi.ucsf.edu/chimera/docs/UsersGuide/menu.html#menuactions> <http://www.rbvi.ucsf.edu/chimera/docs/UsersGuide/midas/focus.html> Then, if needed, you can enlarge by zooming with the mouse or in the Side View, or with the “scale” command. I hope this helps! For future questions, we recommend you send to chimera-users(a)cgl.ucsf.edu instead of only to me, so that others can see the answers, or give better answers than mine. Regards, 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 Jun 2, 2015, at 1:27 PM, A G Szabo <agszabo(a)bell.net> wrote: > Elaine > You were helpful in early April I thought I would ask another question. > > I have been working with a PDB file, 2J28, that is the structure of a > full ribosome with a Signal Recognition Protein and piece of RNA bound to > the ribosome. I figured out how to get rid of all the various parts of the > Ribosome, and visualize only the SRP and piece of RNA attached to it. > > The problem is that I can't figure out how to centre that part of the > overall structure. If I move the SRP/RNA with the wheel on the mouse it > does move to the center of the screen but in the process it becomes very > small. > > I need to be able to transpose the SRP/RNA and then enlarge it. > > Can't figure it out and while there is some stuff in the tutorials and > user info, I couldn't find anything that pertained to what I needed to > do. > > This is the SRP - RNA structure from Protein Workshop after all the > ribosomal particles were hidden. > > > > The image in Chimera is even smaller. > > Thank you again for your help. > > Arthur G. Szabo > Professor Emeritus > Chemistry > Wilfrid Laurier University > Waterloo Canada. > > <winmail.dat>

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Aligning on crystal axis
by Mohamed Noor 02 Jun '15

02 Jun '15

Hello. Is there any easy way to align the view along the crystal axes, such as the ab, ac and bc faces separately? Thanks.

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Python code problem
by Mahendra B Thapa 29 May '15

29 May '15

Dear Chimera users, The command I used was chimera --nogui test.py I tried two codes (following previous posts and tutorials in chimera) in 'test.py' as follows (i) import os from chimera import runCommand as rc from chimera import replyobj rc("open " + 'test.pdb') for i in [2011,2420]: rc("""distance #0.2:2010.B@CB #0.1:%d.B@CB""" %i) *This code gave the result as expected*: Executing test.py... Opening test.pdb... 60 models opened Distance between #0.2:2010.B@CB and #0.1:2011.B@CB: 72.346 Distance between #0.2:2010.B@CB and #0.1:2420.B@CB: 92.979 Executed test.py (ii) import os from chimera import runCommand as rc from chimera import replyobj rc("open " + 'test.pdb') for i in range(2011,2420): rc("""distance #0.2:2010.B@CB #0.1:%d.B@CB""" %i) *This code gave the result as* ' You selected %d.' % numSelected) MidasError: Exactly two atoms/axes/planes must be selected. You selected 1. Error while processing test.py: MidasError: Exactly two atoms/axes/planes must be selected. You selected 1. File "/opt/UCSF/Chimera64-1.5.3/share/Midas/__init__.py", line 1266, in distance ' You selected %d.' % numSelected) What could be the error this code? Only difference between two codes is: "for * i in [2011,2420]:" & "for i in range(2011,2420):"* That is, I am interested to use range operator in 2nd case instead of two values as in the 1st case. Thank you for help, Mahendra Thapa University of Cincinnati,OH

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Ramachandran plot for a selection
by Elena Lilkova 28 May '15

28 May '15

Dear Chimera community, First I would like to just say that I am new to Chimera. I made a MD simulation of a protein using NAMD. Now I am interested in generating a Ramachandran plot for the whole trajectory, but only for a specific selection of my protein, namely three specific residues. I fail to succeed. Could anyone probably suggest a solution? Elena Lilkova elilkova(a)phys.uni-sofia.bg PhD student, Atomic Physics Department, Faculty of Physics, University of Sofia "St. Kliment Ohridski" 5 James Bourchier Blvd. 1164 Sofia, Bulgaria Elena Lilkova elilkova(a)phys.uni-sofia.bg PhD student, Atomic Physics Department, Faculty of Physics, University of Sofia "St. Kliment Ohridski" 5 James Bourchier Blvd. 1164 Sofia, Bulgaria

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Distances in biological assembly
by Mahendra B Thapa 27 May '15

27 May '15

Dear Chimera users The biological assembly of a virus in pdb format consists of 60 models; each model with 3 chains :A, B and C. I am interested to find atoms within 4 angstroms of the atom, say CA atom of residue 2059 of chain B of model 2. The chimera crashed in graphical interface (it could be due to size of the pdb file.), so I used the following command [ http://plato.cgl.ucsf.edu/pipermail/chimera-users/2007-November/002069.html ]: chimera --nogui file_test.cmd > data_rest.log where 'file_test.cmd' consists of open test.pdb findclash #2:2059.B@CA overlap -4 hbond 0 The output file 'data_rest.log' consisted of Opening test.pdb... 60 models opened Opened test.pdb containing 60 models, 677040 atoms, and 89700 residues No contacts No contacts *I want to know whether I have used right chimera command /code. *Any suggestion might help me. Thank you, Mahendra Thapa University of Cincinnati,OH

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scale bar
by Dmitry 27 May '15

27 May '15

Dear developers, How are you? I have a question about scale bar. I am not completely sure that the scale bar I drew is correct. What are the scale settings for drawing the scale bar? By the default the scale bar is in Angstroms isn’t it? In ImageJ there is a possibility to set the scale 1 pixel = X value (nm/Å/etc) Is there the same possibility in Chimera? Thank you Sincerely, Dmitry

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Starting multiple copies of Chimera on Mac
by Tom Goddard 26 May '15

26 May '15

It is possible to run multiple copies of the same Chimera on a Mac. Here’s how. From a Terminal (/Applications/Utilities/Terminal) type the command open -n -a Chimera The -n option tells the Mac to start another copy of the application. If you prefer to start the second copy by clicking an icon then you can make that icon using /Applications/Automator, choose to make an Application, select Run Shell Script, enter the command open -n -a Chimera as the script to run, then File / Save… to save this application as “Chimera+” or whatever you want to call it. This icon always starts a new copy of Chimera so you can have as many running as you like. Tom

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Re: [Chimera-users] On the seeking of the orthologs
by James Starlight 25 May '15

25 May '15

Elaine, George, thank you very much for the suggestions and ideas!! One question- do you know some DB where is possible to seek for the orthologs (e,g based on HMM) agains *several* target sequences with flexible options like to detect minimal percent of the homology for orthologs which to be found or alternatively to make such search based on some *shared* features between those targets (e.g common structural motifs responsible for ligand binding etc) which might be specified by user initially? George, the idea to focus on particular specie seems interesting- initially I've thought in the same way but to focus on the human OR (because here I'm more comfortable with dynamical range patterns of those receptors based on the in vivo Matsunami data for instance). BTW briefly have a look on those DB I didn't find there engine to seek for the orthologs agains given target. Doest this option really exist within it? All the best, James 2015-05-22 21:10 GMT+02:00 George Tzotzos <gtzotzos(a)me.com>: > I would start from BioMart. I’m also working on OR (albeit insect ones). Try also MGI (Mouse Genome Informatics). Starting from mouse Ors you can scoop orthologs in other mammalian species. > > Cheers > > George > >> On 22 May 2015, at 18:44, Elaine Meng <meng(a)cgl.ucsf.edu> wrote: >> >> Hi James, >> Your questions are more about bioinformatics project design rather than Chimera use. >> >> Chimera provides basic BLAST searching of NCBI’s “nr” and “pdb” sequence databases, but these are the same databases generally used by BLAST whether you use it from Chimera or from another program, or stand-alone. Also, Chimera can fetch specific individual sequences from UniProt based on UniProt identifier, but that isn’t searching, it is just getting data you already knew you wanted. >> >> I believe NCBI’s “nr” and UniProtKB are both meant to be comprehensive (cover “all” sequences) but in their own ways, and you would have to go to those resources or their publications to learn the details. There are probably also specialized GPCR and/or olfactory receptor sequence databases. Then there are multiple ways of searching, with individual sequences or with derived patterns such as hidden Markov Models (HMMs). This is a really broad topic and in my opinion, beyond the scope of this forum. You’ve probably done some of this already, but I would recommend reading similar studies in quality journals by authors you respect, to see how they have designed their projects. >> >> Chimera doesn’t have HMM-related tools or evolutionary trace, it just allows conservation analysis on your whole alignment, or subsets of that alignment opened in separate windows. >> >> 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 May 22, 2015, at 9:22 AM, James Starlight <jmsstarlight(a)gmail.com> wrote: >> >>> Dear Chimera users! >>> >>> I'd like to ask some suggestion regarding my bioinformatician task and >>> possible ways of its realisation using some bioinformatics methods >>> implemented in Chimera. >>> >>> 1)I need to seek for some sequence database (here I don't know >>> absolutely how to do it) of the olfactory receptors and to select 10 >>> sequences of the Ors corresponded to 10 different mammalian species -> >>> according to my idea it should be very different species associated >>> with different ecological niches so its olfactory spectrum should vary >>> dramatically. >>> Here the question: in what DB such search should be better with the >>> inclusion of flexible search criteria's like what I've listened above? >>> >>> 2)After allocating of those 10 sequences I should to find *all* >>> possible orthologs against them-> to find all OR in another species >>> which have conservation degree agains target above chosen threshold . >>> Eventually I'll need to make some analysis regarding overall >>> conservation of the OR within different species and to point out what >>> OR are most important (conservative) in different organisms in >>> accordance to some pre-defined criteria's (i.e ecological niche of the >>> species because it's associated with the odor spectrum). Here the >>> question: would the methods like blast-search be enough for such task >>> or I should to use also methods like evolutional tracing (to find all >>> important residues in different OR which tend to co-evaluate) based on >>> its alignment data? >>> >>> I would be very thankful for any suggestion! >>> >>> James >> >> >> _______________________________________________ >> Chimera-users mailing list >> Chimera-users(a)cgl.ucsf.edu >> http://plato.cgl.ucsf.edu/mailman/listinfo/chimera-users >

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On the seeking of the orthologs
by James Starlight 22 May '15

22 May '15

Dear Chimera users! I'd like to ask some suggestion regarding my bioinformatician task and possible ways of its realisation using some bioinformatics methods implemented in Chimera. 1)I need to seek for some sequence database (here I don't know absolutely how to do it) of the olfactory receptors and to select 10 sequences of the Ors corresponded to 10 different mammalian species -> according to my idea it should be very different species associated with different ecological niches so its olfactory spectrum should vary dramatically. Here the question: in what DB such search should be better with the inclusion of flexible search criteria's like what I've listened above? 2)After allocating of those 10 sequences I should to find *all* possible orthologs against them-> to find all OR in another species which have conservation degree agains target above chosen threshold . Eventually I'll need to make some analysis regarding overall conservation of the OR within different species and to point out what OR are most important (conservative) in different organisms in accordance to some pre-defined criteria's (i.e ecological niche of the species because it's associated with the odor spectrum). Here the question: would the methods like blast-search be enough for such task or I should to use also methods like evolutional tracing (to find all important residues in different OR which tend to co-evaluate) based on its alignment data? I would be very thankful for any suggestion! James

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clustering
by Rafael Rocha 22 May '15

22 May '15

hello, I have a set of ligands that share Some atoms in common. How I can clustering only those atoms? Also, how I can change the variation of RMSD for this cluster analysis in the "ensemble cluster" tool of chimera? Thanks, Rafael.

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chimera improvment suggestion
by Michał Kadlof 21 May '15

21 May '15

I have small improvement suggestion: Is it possible to display directories in Open File dialog with different font than files, for example bold? I'm loosing a lot of time on scrolling my directories tree to find particular file to open. Highlighting of directories would be very handy. -- best Michał

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Re: [Chimera-users] How can I calculate RMSD with chimera script
by Eric Pettersen 19 May '15

19 May '15

Since runCommand() doesn't return any value, you need to call the underlying Python rmsd() function, which isn't hard to do. Somewhere at the top of your script put: from Midas import rmsd and then replace: rc("rmsd #0:{0}-{1} #1:{0}-{1}".format(s,k)) with: val = rmsd("#0:{0}-{1}".format(s,k), "#1:{0}-{1}".format(s,k)) --Eric On May 19, 2015, at 12:45 PM, Michał Kadlof <ramidas(a)gmail.com> wrote: > Yes it work, but then I have to write and run another script to parse output from chimera which cost HDD access time. I was wonder, if it possible to do it in single script without dumping output to separate file. > > -- > Michał > > 2015-05-19 18:53 GMT+02:00 Eric Pettersen <pett(a)cgl.ucsf.edu>: > Hi Michał, > Redirecting output from a program into a file is pretty easy in any Unix/Linux shell. This would redirect Chimera's non-error output into a file named "chimera-output.txt": > > chimera chimera-arguments-you-normally-use > chimera-output.txt > > You can also redirect the error output, but the syntax for that depends on the shell you are using. You should be able to easily Google it if you need to do that. > > --Eric > > Eric Pettersen > UCSF Computer Graphics Lab > http://www.cgl.ucsf.edu > > On May 19, 2015, at 1:16 AM, Michał Kadlof <ramidas(a)gmail.com> wrote: > >> Hello, >> >> I have a need of calculating about 1000 of RMSDs between two particular regions of reference model and testing model. I would like to do this with chimera script. I'm using chimera-1.10.1-Headless Linux 64-bit and have no access to any GUI. >> >> Currently my script looks like this: >> >> import sys, os, re >> from chimera import runCommand as rc >> >> << not important stuff >> >> >> rc("open %s" % (native)) >> for i in models: >> rc("open " + i) >> rc("rmsd #0:{0}-{1} #1:{0}-{1}".format(s,k)) >> rc("close #1") >> rc("close all") >> rc("stop now") >> >> This allow me to see output on the screen, but I don't know how to capture it for further processing. I found somewhere something like this: >> >> from chimera.tkgui import saveReplyLog >> << do something >> >> saveReplyLog('replyLog.txt') >> >> But it seem to work only in versions with GUI. >> >> Please help. >> >> -- >> best whishes >> Michał Kadlof >> >> University of Warsaw >> _______________________________________________ >> Chimera-users mailing list >> Chimera-users(a)cgl.ucsf.edu >> http://plato.cgl.ucsf.edu/mailman/listinfo/chimera-users > > > >

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Load AMBER parm/traj from command line.
by ros 19 May '15

19 May '15

Hello! Is it possible to start up chimera and have it load an AMBER topology and trajectory file? For example, in Linux, you can start VMD with: vmd -parm7 name.prmtop -netcdf traj.nc And will load the topology with the corresponding trajectory frames. In chimera we do that using the 'Get Ensemble info' window in the MD movie tools. Is it possible to do it in a single line? Thank you! Rodrigo.

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How can I calculate RMSD with chimera script
by Michał Kadlof 19 May '15

19 May '15

Hello, I have a need of calculating about 1000 of RMSDs between two particular regions of reference model and testing model. I would like to do this with chimera script. I'm using chimera-1.10.1-Headless Linux 64-bit and have no access to any GUI. Currently my script looks like this: import sys, os, re from chimera import runCommand as rc << not important stuff >> rc("open %s" % (native)) for i in models: rc("open " + i) rc("rmsd #0:{0}-{1} #1:{0}-{1}".format(s,k)) rc("close #1") rc("close all") rc("stop now") This allow me to see output on the screen, but I don't know how to capture it for further processing. I found somewhere something like this: from chimera.tkgui import saveReplyLog << do something >> saveReplyLog('replyLog.txt') But it seem to work only in versions with GUI. Please help. -- best whishes Michał Kadlof University of Warsaw

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depth cue by color for tomogram
by Michael Elbaum 18 May '15

18 May '15

Hello all, I noticed a new sort of 3D color glasses (http://chromatek.com/) that work via blue-red chromatic aberration rather than shifted pairs. I think this would be a useful addition if it isn't available already somehow. The major advantage for a lecture situation is that 2D images are visible also without glasses. I tried to encode depth by color in Chimera but was not successful. I'm using solid style with transparency to see "into" the tomogram, loaded in Volume Viewer. I'd like the deep features to be in one color and the higher parts another, with sparse regions relatively transparent. In the main Viewing panel there's an option for depth cue on the Effects tab, but the cueing is relative to the Side View orientation rather than the real depth. Also there seems to be no option for a color gradient. thanks for any help, Michael Prof Michael Elbaum Dept of Materials and Interfaces Weizmann Institute of Science Rehovot 76100, ISRAEL tel +972 (0)8-9343537 fax +972 (0)8-9344138

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Select multiscale model surface pieces with command lines
by TUBIANA Thibault CNRS 18 May '15

18 May '15

Hi everyone! I Want to script a movie, but to do so, I need to select some surface pieces of a virus multiscale model with command line. I didn't find any way to do that. I try to select them with the mouse (ctrl+click) and then rename the selection with "namesel", it works but when I save the session and reload it, theses selections are cleared.... I can't do that each times I load my session because I have plenty of them and it's to generate the movie on SSH on another computer more powerfull... I can't split them to create a new model (for exemple with coordinates) because I will have to update all my "savepos" position... Did someone know how to do that ? Thank you a lot for your help, Regards, -- Tubiana Thibault PhD Student Institut de Biologie Intégrative de la Cellule CNRS UMR 9198 CEA-Saclay, Bâtiment 532 - Pce 12A 91191 Gif-sur-Yvette 06.79.90.95.85 http://www.tubiana.me

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Problem running Chimera remotely on CentOS7 system
by "Kestilä, Veli-Pekka" 12 May '15

12 May '15

Hi, I have following error when trying to run Chimera remotely on CentOS7 system from OSX this seems to affect also Windows with Xming libGL error: dlopen /usr/lib64/dri/swrast_dri.so failed (/opt/sci/UCSF-Chimera64-1.10.1/lib/libgcc_s.so.1: version `GCC_4.7.0' not found (required by /usr/lib64/dri/swrast_dri.so)) libGL error: unable to load driver: swrast_dri.so libGL error: failed to load driver: swrast X Error of failed request: GLXBadContextTag Major opcode of failed request: 150 (GLX) Minor opcode of failed request: 5 (X_GLXMakeCurrent) Serial number of failed request: 1359 Current serial number in output stream: 1359 On windows the error is: ibGL error: dlopen /usr/lib64/dri/swrast_dri.so failed (/opt/sci/UCSF-Chimera64-1.10.1/lib/libgcc_s.so.1: version `GCC_4.7.0' not found (required by /usr/lib64/dri/swrast_dri.so)) libGL error: unable to load driver: swrast_dri.so libGL error: failed to load driver: swrast X Error of failed request: GLXBadCurrentWindow Major opcode of failed request: 145 (GLX) Minor opcode of failed request: 5 (X_GLXMakeCurrent) Serial number of failed request: 1350 Current serial number in output stream: 1350 How I can get this to work? Intended use would be in classroom where we don't have permissions to run or install Chimera. Greetings, Veli-Pekka Kestilä -- Veli-Pekka Kestilä / Huone 4318 / Biokeskus 3 (Viikinkaari 1) / 050-3000014

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Acylation of peptide
by Remmer Salas 08 May '15

08 May '15

Hi! I am new to Chimera and I am trying to modify the PDB file of a peptide by acylation. I have also a PDB file for the fatty acid which I got by removing the bound protein. I used the join models to form a peptide bond but prompted with this error: The following problems occurred while reading PDB file for anomt1.pdbStart residue of secondary structure not found: HELIX 1 1 LEU 2 LEU 10 1 8Model 1 (anomt1.pdb) 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 3Use command 'help ksdssp' for more information.TypeError Exception in Tk callback Function: <bound method BuildStructureDialog._addParamBond of <BuildStructure.gui.BuildStructureDialog object at 0x04F9FBF0>> (type: <type 'instancemethod'>) Args: ()Traceback (innermost last): File "C:\Program Files\Chimera 1.10.1\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 1.10.1\share\BuildStructure\gui.py", line 313, in _addParamBond self._appbDihedral.get(), phi=self._appbPhi.get()) File "C:\Program Files\Chimera 1.10.1\share\BuildStructure\__init__.py", line 869, in cnPeptideBond cn[1].residue.phi = phi File "C:\Program Files\Chimera 1.10.1\share\chimera\phipsi.py", line 91, in setPhi _setAngle(bond, phi, getPhi(res), "phi") File "C:\Program Files\Chimera 1.10.1\share\chimera\phipsi.py", line 134, in _setAngle br.angle = (newAngle - curAngle, br.biggerSide())TypeError: unsupported operand type(s) for -: 'float' and 'NoneType' TypeError: unsupported operand type(s) for -: 'float' and 'NoneType' File "C:\Program Files\Chimera 1.10.1\share\chimera\phipsi.py", line 134, in _setAngle br.angle = (newAngle - curAngle, br.biggerSide()) My first question is how to solve this error. Second, how can I optimize the generated PDB file using Chimera? I want also to convert this optimize PDB file to PQR. Any advice is greatly appreciated.

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clip planes
by Bharat Lakhani 08 May '15

08 May '15

Dear All I want to visualize the core of my protein, Is it possible to slice the protein right into two half in order to visualize the core of the protein. I tried using chimera pre-capping model but it has not been work out well. Any suggestion on this would be great. Thanks

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