February 2022 - ChimeraX-users - RBVI Mailing Lists

Define axis tool missing?
by James Hodgkinson-Bean 20 Feb '22

20 Feb '22

Hi I am currently doing some geometric analysis of a protein complex, and was wanting to define certain axis normal to planes I have defined; on the online chimerax documentation there seems to be an option “define axis”, however in my actual chimeraX program, this command doesn’t work, and is not listed under the “help define” command which shows how to define planes and centroids. I am running ChimeraX version 1.3 (2021-12-08), which I downloaded recently. Any assistant would be much appreciated 😊 P.S I absolutely love chimeraX!! It is one of the best pieces of software I’ve ever used. Cheers, James.

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The ChimeraX-Modeller interface
by Ralph Loring 19 Feb '22

19 Feb '22

Hi, The intracellular domain (ICD) of Alpha7 nicotinic receptors, like almost all eukaryotic Cys-loop receptors, is not resolved using X-ray crystallography or cryo-EM. Last week the PDB for an ensemble of NMR ICD structures for the receptor was released (PDB 7RPM). I've been unsuccessfully trying to use ChimeraX and Modeller to make a model of a subunit that includes the ICD. The 7RPM models include all 4 transmembrane domains and the ICD (but lacks the extracellular domain), so there is considerable overlap with the 7KOO PDB fo a7. I started by deleting all but one of the identical subunits in the 7KOO pdb and loaded one of the 7RPM models and tried to use Modeller to make a construct that includes both the extracellular domain and the ICD. Unfortunately, even though both 7KOO and the single 7RPM are in the sequence alignments window, the ChimeraX-Modeller combination ignores the structure that is not chosen as the target (e.g. if 7RPM is the target, there is no extracellular domain, but if 7KOO is the target, there is either no ICD or the ICD that is shown bears no relevance to the structure in 7RPM). I can align the two structures well with a low RMSD using Matchmaker because of the TMDs overlapping. I just want to fill in the missing parts. Is there a special trick to get Modeller to fill in the missing parts using ChimeraX as the interface? I'm not that experienced using Modeller. Thanks, 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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surfvalues.py
by 始夏谨柘 19 Feb '22

19 Feb '22

      Hello,          This python script was downloaded on UCSF CHIMERA page (https://www.rbvi.ucsf.edu/trac/chimera/attachment/wiki/Scripts/surfvalues.p…), and running it on UCSF CHIMERA X will cause an error. UCSF CHIMERA X (https://rbvi.github.io/chimerax-recipes/) has not found the corresponding script. If I still want to achieve the function of this script (surfvalues.py) , what should I do? I tried that at UCSF CHIMERA, but the volume of the protein is too large for it. Best Wishes,                                                                                                  FAYE

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System Requirements
by Niver, Terry 17 Feb '22

17 Feb '22

Hello, I am attempting to assist a researcher here at the University of Rochester configure a new laptop on which he wants to run ChimeraX. I was trying to locate the system requirements on the website but didn’t have any luck. Would someone be able to send me a list? Thanks, Terry Terry Niver Manager, Research and Academic Information Technology Technical Support University of Rochester School of Medicine and Dentistry E-mail: terry_niver(a)urmc.rochester.edu<mailto:terry_niver@urmc.rochester.edu> Phone: 585-276-5538

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fine tuning depthcue
by vincent Chaptal 17 Feb '22

17 Feb '22

Hi, I've been playing around a lot with depthcue-ing but I can't get it to do quite what I would like. I want to display a protein structure, with a focus on one zone and a "heavy" depthcue to have a strong "fog" hiding much of the background (without deleting the residues in the back). my script includes: lighting full #(sometimes I use soft too) lighting shadows true intensity 0.3 lighting qualityOfShadows finer lighting depthcue true depthCueStart 0.1 depthCueEnd 1.0 First, I have selected one residue and setting the rotation around it by using "cofr sel" My max depthcue is with "depthCueStart 0.1 depthCueEnd 1.0". I've tried to change these numbers in many different ways, including negative or very large numbers) but I can't get it to be thicker. Could you help me please. I missed the meaning of these values, so I'm blind on their use. Thank you Vincent -- Vincent Chaptal, PhD Director of GdR APPICOM Drug Resistance and Membrane Proteins Lab MMSB -UMR5086 7 passage du Vercors 69007 LYON FRANCE +33 4 37 65 29 01 http://www.appicom.cnrs.fr http://mmsb.cnrs.fr/en/

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Re: [chimerax-users] VR Support
by Jessie Lopez 16 Feb '22

16 Feb '22

I am writing an article promoting the use of VR for modelling. I use an HTC Vive to access ChimeraX VR, but I have heard rumours it will be discontinued soon. The Samsung Odyssey is already discontinued. With Meta dominating the VR headset market, many companies are bailing out. Do you have any recommendations about which headsets should scientists invest in if they want to use ChimeraX? Thank you! -. .-. .-. .-. .-. .-. .-. .-. .-. .-. .-. .-. . ||*\*|||*\* /|||*\*|||*\* /|||*\*|||*\* /|||*\*|||*\* /|||*\*|||*\* /|||*\*|||*\* /| |/ *\*|||*\*|||/ *\*|||*\*|||/ *\*|||*\*|||/ *\*|||*\*|||/ *\*|||*\*|||/ *\*|||*\*|| ~ `-~ `-` `-~ `-` `-~ `-~ `-~ `-` `-~ `-` `-~ `- *Jessie MNG Lopez Suzuki* PhD Candidate, Molecular, Cell and Developmental Biology *Zahler Laboratory* The Center for Molecular Biology of RNA University of California, Santa Cruz Sinsheimer 419 (831) 459-5127 *jlopez99(a)ucsc.edu <jlopez99(a)ucsc.edu>* (they, she or he pronouns)

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Re: [chimerax-users] Error reported by AlphaFold
by Tom Goddard 16 Feb '22

16 Feb '22

Hi Juntao, Yes, ChimeraX AlphaFold on Google Colab only handles about 1000 amino acids before running out of memory on the 5 year old GPUs (e.g. P100, K80, T4) with 16 Gbytes of GPU memory that they provide. This is a limitation of AlphaFold. Your 1500 amino acids would run fine on an Nvidia RTX 3090 GPU which has 24 Gbytes, or on higher-end GPUs like an Nvidia A40 with 48 Gbytes. These sequence size limits are a significant limitation of AlphaFold. Here is a web page I made showing AlphaFold runs that failed and succeeded and the largest sequences that worked in these tests on Colab was ~1100 residues, on an RTX 3090 it managed 2100 residues and on an A40 it got up to 3700 residues. https://www.rbvi.ucsf.edu/chimerax/data/alphafold-jan2022/afspeed.html Tom > On Feb 16, 2022, at 6:56 AM, Juntao Yu <juntao_yu(a)g.harvard.edu> wrote: > > Hi Tom, > > Thank you for your email. I checked the log and realized the failure was indeed because of out of memory on Google Colab. The protein complex is about 1500 amino acids large so probably that is the reason. It’s good to know that it might take lots of memory for alphaFold to calculate large complexes. I will try to run the prediction on our clusters or lab computers with GPU instead then. Thank you. > > Best, > Juntao

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alphafold block
by Roberto Marabini 15 Feb '22

15 Feb '22

Hi, I would like to write a script that executes "alphafold predict SEQUENCE" and then postprocess the results. The script would be similar to: from chimerax.core.commands import run run(session, "alphafold predict %s" % sequence_data) # wait until alphafold is done # and postprocess the file best_model.pdb but I do not know how to implement the part "wait until alphafold is done" if, after launching alphafold, I create a loop similar to: === counter = 0 current_size = _getSize(file_path) while current_size !=_getSize(file_path) or _getSize(file_path)==0 or not os.path.exists(file_path): current_size =_getSize(file_path) time.sleep(60) counter += 1 if counter > 240: # break after four hours if file is not created break ==== the loop is executed as soon as the alphafold command has been sent to google, the alphafold-colab window is not shown until the loop is finished and therefore, alphafold execution never starts. So the question is: how can I write a script that waits until the command "alphafold predict ..." finishes and then executes some code. Thanks Roberto

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Re: [chimerax-users] error with open :: 'foreach' has no suffix
by Eric Pettersen 15 Feb '22

15 Feb '22

Yes, that was quite helpful. The 'foreach' option only became available starting with the 1.3 release. You are running 1.2.5, so you need to upgrade. --Eric > On Feb 14, 2022, at 3:35 PM, Rangarajan, Amith <Amith.Rangarajan(a)ucsf.edu> wrote: > > This Message Is From an External Sender > This message came from outside your organization. > hi Eric, > > i have submitted a bug report > > > thanks > amith > From: Eric Pettersen <pett(a)cgl.ucsf.edu <mailto:pett@cgl.ucsf.edu>> > Sent: Monday, February 14, 2022 3:15 PM > To: Rangarajan, Amith <Amith.Rangarajan(a)ucsf.edu <mailto:Amith.Rangarajan@ucsf.edu>> > Cc: ChimeraX Users Help <ChimeraX-users(a)cgl.ucsf.edu <mailto:ChimeraX-users@cgl.ucsf.edu>> > Subject: Re: [chimerax-users] error with open :: 'foreach' has no suffix > > This Message Is From an External Sender > This message came from outside your organization. > Hi Amith, > I don't care so much about the contents of your script per se — I'd like to see the contents of the log when the error occurs. Do this: run the command that generates the "'foreach' has no suffix" error and then use Help→Report A Bug and submit a bug report. That will include the contents of the log, which is what I need to see. Thanks! > > --Eric > >> On Feb 10, 2022, at 4:52 AM, Rangarajan, Amith <Amith.Rangarajan(a)ucsf.edu <mailto:Amith.Rangarajan@ucsf.edu>> wrote: >> >> This Message Is From an External Sender >> This message came from outside your organization. >> Dear Tom and Eric, >> >> I used notepad ++ to make sure that the cxc file was not a .txt ( i am on windows) and i am still getting the error ( foreach has no suffix) . i have attached my .cxc script . >> >> I am trying to read a set of .mae files and write a log file with RMSD and some distance measurements. >> >> I am new to chimera and would benefit a lot from your review of my script and possible fixes for this issue. >> >> thank a lot for your time. >> >> best regards, >> amith >> From: Tom Goddard <goddard(a)sonic.net <mailto:goddard@sonic.net>> >> Sent: Tuesday, February 8, 2022 10:36 AM >> To: PETTERSEN, ERIC <pett(a)cgl.ucsf.edu <mailto:pett@cgl.ucsf.edu>> >> Cc: Rangarajan, Amith <Amith.Rangarajan(a)ucsf.edu <mailto:Amith.Rangarajan@ucsf.edu>> >> Subject: Re: [chimerax-users] error with open :: 'foreach' has no suffix >> >> This Message Is From an External Sender >> This message came from outside your organization. >> Hi Eric, >> >> Not quite sure I understand your theory abut Amith's error. In current ChimeraX daily build using non-existent files with open command >> >> open something.cxc foreach somethingelse.py >> > No such file/path: something.cxc >> >> gives a very sensible error message and does not try to interpret "foreach" as a file name. >> >> Tom >> >>> On Feb 8, 2022, at 9:40 AM, Eric Pettersen via ChimeraX-users <chimerax-users(a)cgl.ucsf.edu <mailto:chimerax-users@cgl.ucsf.edu>> wrote: >>> >>> Hi Amith, >>> That error message indicates to me that the first file name (script.cxc) isn't being recognized as a ChimeraX command script file. So take a hard look at the command you typed and make sure that the suffix for that file is ".cxc" and not something mistyped like ".cxs" or whatnot. >>> >>> --Eric >>> >>> Eric Pettersen >>> UCSF Computer Graphics Lab >>> >>> >>>> On Feb 8, 2022, at 6:25 AM, Rangarajan, Amith via ChimeraX-users <chimerax-users(a)cgl.ucsf.edu <mailto:chimerax-users@cgl.ucsf.edu>> wrote: >>>> >>>> This Message Is From an External Sender >>>> This message came from outside your organization. >>>> Hi, >>>> >>>> I am trying to run a script and want to use foreach ( open script.cxc foreach *.pdb) to iterate through several pdb files in the working directory. >>>> >>>> I had no issues with running it earlier, but since last few tries, i am getting an error stating that ""'foreach' has no suffix"" >>>> >>>> I am not able to figure out how to debug this. >>>> >>>> I am using the latest build of chimerax. >>>> >>>> I will highly appreciate your suggestions on fixing this. >>>> >>>> best >>>> amith >>>> _______________________________________________ >>>> ChimeraX-users mailing list >>>> ChimeraX-users(a)cgl.ucsf.edu <mailto:ChimeraX-users@cgl.ucsf.edu> >>>> Manage subscription: >>>> https://plato.cgl.ucsf.edu/mailman/listinfo/chimerax-users <https://plato.cgl.ucsf.edu/mailman/listinfo/chimerax-users> >>> _______________________________________________ >>> ChimeraX-users mailing list >>> ChimeraX-users(a)cgl.ucsf.edu <mailto:ChimeraX-users@cgl.ucsf.edu> >>> Manage subscription: >>> https://plato.cgl.ucsf.edu/mailman/listinfo/chimerax-users <https://plato.cgl.ucsf.edu/mailman/listinfo/chimerax-users> >> <RMSD-distance-final.cxc>

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Re: [chimerax-users] error with open :: 'foreach' has no suffix
by Rangarajan, Amith 14 Feb '22

14 Feb '22

Dear Tom and Eric, I used notepad ++ to make sure that the cxc file was not a .txt ( i am on windows) and i am still getting the error ( foreach has no suffix) . i have attached my .cxc script . I am trying to read a set of .mae files and write a log file with RMSD and some distance measurements. I am new to chimera and would benefit a lot from your review of my script and possible fixes for this issue. thank a lot for your time. best regards, amith ________________________________ From: Tom Goddard <goddard(a)sonic.net> Sent: Tuesday, February 8, 2022 10:36 AM To: PETTERSEN, ERIC <pett(a)cgl.ucsf.edu> Cc: Rangarajan, Amith <Amith.Rangarajan(a)ucsf.edu> Subject: Re: [chimerax-users] error with open :: 'foreach' has no suffix Hi Eric, Not quite sure I understand your theory abut Amith's error. In current ChimeraX daily build using non-existent files with open command open something.cxc foreach somethingelse.py > No such file/path: something.cxc ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ‍ ZjQcmQRYFpfptBannerStart This Message Is From an External Sender This message came from outside your organization. ZjQcmQRYFpfptBannerEnd Hi Eric, Not quite sure I understand your theory abut Amith's error. In current ChimeraX daily build using non-existent files with open command open something.cxc foreach somethingelse.py > No such file/path: something.cxc gives a very sensible error message and does not try to interpret "foreach" as a file name. Tom On Feb 8, 2022, at 9:40 AM, Eric Pettersen via ChimeraX-users <chimerax-users(a)cgl.ucsf.edu<mailto:chimerax-users@cgl.ucsf.edu>> wrote: Hi Amith, That error message indicates to me that the first file name (script.cxc) isn't being recognized as a ChimeraX command script file. So take a hard look at the command you typed and make sure that the suffix for that file is ".cxc" and not something mistyped like ".cxs" or whatnot. --Eric Eric Pettersen UCSF Computer Graphics Lab On Feb 8, 2022, at 6:25 AM, Rangarajan, Amith via ChimeraX-users <chimerax-users(a)cgl.ucsf.edu<mailto:chimerax-users@cgl.ucsf.edu>> wrote: This Message Is From an External Sender This message came from outside your organization. Hi, I am trying to run a script and want to use foreach ( open script.cxc foreach *.pdb) to iterate through several pdb files in the working directory. I had no issues with running it earlier, but since last few tries, i am getting an error stating that ""'foreach' has no suffix"" I am not able to figure out how to debug this. I am using the latest build of chimerax. I will highly appreciate your suggestions on fixing this. best amith _______________________________________________ ChimeraX-users mailing list ChimeraX-users(a)cgl.ucsf.edu<mailto:ChimeraX-users@cgl.ucsf.edu> Manage subscription: https://plato.cgl.ucsf.edu/mailman/listinfo/chimerax-users _______________________________________________ ChimeraX-users mailing list ChimeraX-users(a)cgl.ucsf.edu<mailto:ChimeraX-users@cgl.ucsf.edu> Manage subscription: https://plato.cgl.ucsf.edu/mailman/listinfo/chimerax-users

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ChimeraX-users February 2022