May 2020 - ChimeraX-users - RBVI Mailing Lists

How to display crystal packing?
by Guillaume Gaullier 08 May '20

08 May '20

Hello, Today I was trying to display a crystal packing from a PDB entry in ChimeraX, but could not find how to do this. I read the documentation for the sym command https://www.cgl.ucsf.edu/chimerax/docs/user/commands/sym.html ; but either I didn’t get it, or this is not the adequate command for what I am trying to do. What I want to do is the equivalent of PyMOL’s "Action / generate / symmetry mates / +/- one unit cell and within… Å", which is different from the biological assembly the sym command can generate from the PDB annotation. When working with crystallographic data, ISOLDE displays molecules related to the working model by crystallographic symmetry, so displaying the crystal packing seems doable in ChimeraX. Or is it one of ISOLDE’s additions? It would be wonderful if someone could help me with this (it is one of the last few things I need on a regular basis, that I still don’t know how to do in ChimeraX). Thank you in advance, Guillaume

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preview ChimeraX 1.0!
by Elaine Meng 07 May '20

07 May '20

The ChimeraX 1.0 (!!) release candidate is now available: <http://www.rbvi.ucsf.edu/chimerax/download.html> Please, please try it out and report any issues that you find, as we plan to make the production release by the end of the month. To report issues, use the ChimeraX menu: Help... Report a Bug <http://www.rbvi.ucsf.edu/chimerax/docs/contact.html> For what's new, see the Change Log: <https://www.rbvi.ucsf.edu/trac/ChimeraX/wiki/ChangeLog> Thanks! Elaine ----- Elaine C. Meng, Ph.D. UCSF Chimera(X) team Department of Pharmaceutical Chemistry University of California, San Francisco

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Problems with making movie in chimerax
by Nandish Kumar Khanra 07 May '20

07 May '20

Hello all, I want to make a movie of a multi-domain protein between two functional states using Chimerax. One domain undergoes drastic conformational change while there is virtually no structural change in another domain. I did the following steps to make the movie. * Aligned two models using matchmaker, mm #1 to #2 pair ss ss false * make morph morph #1,2 frames 100 play false cartesian true * make movie movie record size 1000,1000 coordset #3 wait 100 movie encode output ~/Desktop/movie1.mp4 quality higher framerate 25 roundTrip true The stationary domain of two functional states aligned perfectly after structural alignment, but I do see motions in that domain in the movie. Am I doing anything wrong? Is there a way to overcome this? Thanks, Nandish

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Script to color zone a map according to the underlying model
by Caroline Stone 07 May '20

07 May '20

Dear All, As an exercise in scripting, I am trying to write a script to imitate the appearance a published figure (from Toropova et al 2017). I would like to display a semi-transparent map which has been color zoned to match the underlying model in surface view. ChimeraX does everything in the script apart from the last two commands, in which I color zone the map, and then make it transparent. I don't get any errors in the log to give me a clue what to change. If I omit these last two commands from the script and then make them manually from the command line after the script is finished, it works. Is there something I can change that would allow me to include the final two commands in the script? Any pointers would be much appreciated. # ChimeraX script to imitate dynein 2 tail Toropova et al 2017 figure style # Adds custom colours to the ChimeraX session # Open model and set camera view and model rotation open 6RLB windowsize 775 775 view matrix camera -0.30533,0.56038,0.76991,623.53,0.82837,-0.24247,0.50499,467.83,0.46967,0.79195,-0.39016,-7.3434 models #1,1,0,0,0,0,1,0,0,0,0,1,0 # Work with model representation surface #1 set bgColor white lighting soft graphics silhouettes true # Define custom colours color name midblue #6b80b5 color name midgreen #a0c497 color name midyellow #f9ef87 color name midtomato #f97054 color name midmagenta #a4449b # Recolour model using custom colours defined above select #1/A; color sel midblue select #1/B; color sel skyblue select #1/C; color sel midtomato select #1/D; color sel midmagenta select #1/E/F; color sel midgreen select #1/G/H; color sel lightpink select #1/I-N; color sel midyellow select clear # Open map and modify color and transparency open emdb:4918 volume #2 step 1 volume #2 level 0.0172 surface dust #2 size 10 color zone #2 near #1 distance 15 volume #2 transparency 0.75 Best wishes, Caroline

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Silhouettes cause fill
by Daniel Asarnow 06 May '20

06 May '20

Hi, Is there any way to avoid this effect where silhouettes lead to an apparent flood fill? The helix in the upper left of this clip shows what I mean: [image: image.png] I was able to work around it a bit by making the silhouettes thinner than I'd like, and aggressively supersampling. It seems severe with any silhouette width greater than 1. Thanks and best, -da

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Re: [chimerax-users] Chimera X -showing electrostatic potential
by Elaine Meng 06 May '20

06 May '20

Dear Yi Shi, The structure is nice work, and worth showing off! We are fine so far... I hope you are well too. To color a surface by electrostatic potential in ChimeraX, currently you need to use a separate program to generate the electrostatic potential map, for example the APBS web server or the DelPhi web server mentioned/linked to the Chimera tutorial here: <http://www.rbvi.ucsf.edu/chimera/docs/UsersGuide/tutorials/surfprop.html#es…> After you generate the map (e.g. a .dx file, .phi file, or .cube file) <http://rbvi.ucsf.edu/chimerax/docs/user/commands/open.html#volume> ... then you can open it in ChimeraX and use it for coloring the protein molecular surface with the ChimeraX "color electrostatic" command: <http://rbvi.ucsf.edu/chimerax/docs/user/commands/color.html#map> If you open a .cube file it will automatically show as isosurfaces. However, you can hide the isosurfaces such as by clicking the "eye" icon in the Volume Viewer panel, and then carry on with using the coloring command as mentioned above. Of course, you need to open the protein structure and then display the protein's molecular surface first, e.g. with the "surface" command, Actions menu, or Molecule Display icon. <http://rbvi.ucsf.edu/chimerax/docs/user/commands/surface.html> I hope this helps, Elaine ----- Elaine C. Meng, Ph.D. UCSF Chimera(X) team Department of Pharmaceutical Chemistry University of California, San Francisco > On May 5, 2020, at 7:14 PM, Yi Shi <yi.shi(a)pitt.edu> wrote: > > Dear Elaine, > > Hope this finds you, your family and colleagues safe and well. > > We have a question about Chimera X software that you and your colleagues developed. Do you know how to show the electrostatic potential using Chimera X? Do we need some external software to do this? > > BTW, the software that you developed was amazing that we really enjoy it. And thanks a million for using our Nup84 hybrid structure for the cover of your paper in Protein Science. Absolutely beautiful work! > > Thanks in advance. > Yi > > Yi Shi Ph.D. > Assistant Professor > Department of Cell Biology > Program for Integrative Systems Biology > Pitt/ CMU Program in Computational Biology > University of Pittsburgh School of Medicine > BST3 9049 > 3500 5th Avenue > Pittsburgh PA 15213 > 412-383-3242 (office) > 412-383-3243 (lab) > www.shi-lab.org

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Scroll threshold step size
by Daniel Asarnow 04 May '20

04 May '20

Hi, Is it possible to adjust the step size when using alt + scrollwheel to change the contour level? I'd like to make it coarser for RSI reasons. Thanks, -da

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ubuntu 20.04
by Hua tiger 03 May '20

03 May '20

Please create a download and install package for ubuntu 20.04 Thank you very much. John

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Chimera-Animation equivalent utility/command
by Ray Y.-R. Wang 01 May '20

01 May '20

Dear all, I have been searching for the equivalent function in ChimeraX for the Animation functionality (under Tools/Utilities) in Chimera, where we can save many checkpoints as "scenes" in one Chimera session. I am wondering whether there's a command-line equivalent thing in ChimeraX I can adapt. Thanks so much! Best, Ray

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Missing segments
by Daniel Asarnow 01 May '20

01 May '20

Hi all, When I save a CIF from ChimeraX, the missing segment pseudobonds are replaced by real (super unphysical) bonds. Can I do something about it, or is this a bug? Thanks and best, -da

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ChimeraX-users May 2020