November 2021 - ChimeraX-users - RBVI Mailing Lists

ChimeraX AlphaFold2
by Ichcharisma 20 Nov '21

20 Nov '21

Hi ChimeraX Dev I wondering if I can run oligomer prediction on ChimeraX AlphaFold features. As we can do it with others colabfold version out there. Thank you

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Feature request: windowsize to be stored with session
by mailman-bounces＠cgl.ucsf.edu 18 Nov '21

18 Nov '21

From: Vorländer,Matthias Kopano <matthias.vorlaender(a)imp.ac.at <mailto:matthias.vorlaender@imp.ac.at>> Date: November 18, 2021 at 8:47:33 AM PST Dear all, I would like to suggest that the current windowsize is associated with a ChimeraX session. This is particularly useful when making figures in a reproducible manner (if I am not mistaken, when opening a .cxs file it will open it with the same windowsize that has been used for the last chimera session, rather than the one that was used when the session was created). I am aware that the windowsize can be specified in a script file. Thanks a lot for your consideration : ) Best, Matthias

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Re: [chimerax-users] [Chimera-users] chimera, H-bonds
by Elaine Meng 18 Nov '21

18 Nov '21

> On Nov 18, 2021, at 11:37 AM, Rio Aquarius via Chimera-users <chimera-users(a)cgl.ucsf.edu> wrote: > > Dear Developer, > I have a specific task for ChimeraX. I want to show H-bonds and hide all amino acid residues. But when I hide amino acid residues, all H-bonds I need disappear. Is there a way to do what I want? Dear Rio, The H-bond displays are lines (pseudobonds) drawn between atoms. When you hide those atoms, the H-bonds are also hidden. I don't understand why you would want to display a bunch of lines in space without any atoms, as you won't be able to see most of the valuable information from the calculation. However, I will explain how to do it: In ChimeraX, there is no pseudobond option to display even when its atoms are hidden. The only way to make it look like the H-bond lines are shown when you can't see the atoms (and/or ribbons) is to make the atoms (and/or ribbons) 100% transparent with the "transparency" command. Example commands: open 2gbp hbonds reveal true transparency 100 target ar <https://rbvi.ucsf.edu/chimerax/docs/user/commands/transparency.html> I hope this helps, Elaine ----- Elaine C. Meng, Ph.D. UCSF Chimera(X) team Department of Pharmaceutical Chemistry University of California, San Francisco

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getting sequences into the Structure Prediction
by Marc Pusey 17 Nov '21

17 Nov '21

Hi - I may be missing something very obvious, but... I am trying to input and use protein sequences for structure predictions using the AlphaFold feature of ChimeraX. I've not had any problems when the sequence can be obtained from a UniProt file, but several of the proteins I'm working with do not have such a file available. Additionally, there is going to come a time where I will want to see what the consequences are from making mutations to those sequences that are available from UniProt. The input gives the option of either Paste or UniProt, but I've not found a way to do a simple cut and paste to put in the sequence. I'm using a Mac running Mojave, version 10.14.6. Thanks! Marc Pusey -- Marc Pusey

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Viewing all frames of trajectory at once
by German Barcenas 17 Nov '21

17 Nov '21

Hello, I've made a trajectory of some similar frames that are stored as an .xtc file. I can upload this with my defined topology file (.pdb) and see each frame individually. Currently I can create a picture of each frame with the frame centered on some residue (SQA) with: perframe "save ~\snapshot_$1.png" frames 10;coordset #1 holdSteady /A:SQA This creates individual pictures for each frame which is nice. I was wondering how one makes a picture with all 10 frames superimposed on each other. I'd also like to change all but the 1st frame to be transparent. I'm aware of the transparent command, which I presume I'd apply to all frames except the 1st, but I'm not sure how to display all frames at once. I'm also struggling on the 1st frame only condition. This is my current attempt: perframe "transparency 0 ALL" frames 1;perframe "transparency 25 ALL" frames 9;coordset #1 holdSteady /A:SQA Thanks, -- German Barcenas Ph.D Candidate | Materials Science and Engineering Materials Modeling and Theory Group Boise State University

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Model info editing
by Eric Pettersen 16 Nov '21

16 Nov '21

Hi all, The current daily build (not 1.3 release candidate) has a new feature that may be of general interest. You can change the name/ID of a model in the Model Panel by double clicking on the corresponding field and entering a new value. --Eric Eric Pettersen UCSF Computer Graphics Lab

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Feature request regarding clipping planes
by Pranav Shah 15 Nov '21

15 Nov '21

Hi Team, Chimera has really nice clipping planes visibility and UX in comparison to ChimeraX. While it may take some effort to include the middle-click based riflling through planes shortcut, in the short term would it be possible to change the color of the clipping planes to a color that isnt gray? Currently, it is quite hard to see the clipping planes in the default view (see attached image). Best, Pranav -- Pranav Shah Postdoctoral Research Fellow. Division of Structural Biology, Wellcome Trust Centre for Human Genetics, University of Oxford, Roosevelt Drive, Oxford OX3 7BN, UK

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Re: [chimerax-users] Any interest in reading ModelArchive metadata from mmCIF files?
by Tom Goddard 12 Nov '21

12 Nov '21

Hi Elaine, This is related but a little different from what Ben was asking. It is different because the template and scoring data in the mmCIF tables could be shown no matter how the mmCIF file is loaded -- it would not be limited to fetching from ModBase. Maybe Ben has an opinion about how desirable it is to put the Chimera ModBase fetch capability into ChimeraX, and whether it is more or less desirable than making the new mmCIF tables accessible in ChimeraX, to help figure out priorities. Tom > On Nov 12, 2021, at 3:05 PM, Elaine Meng <meng(a)cgl.ucsf.edu> wrote: > > Chimera had a ModBase Fetch: > > "a SwissProt, TrEMBL, GenPept or PIR accession code will be used to fetch comparative models in PDB format from ModBase (associated information will be shown in a model list)" > > https://www.rbvi.ucsf.edu/chimera/docs/UsersGuide/modbase.html <https://www.rbvi.ucsf.edu/chimera/docs/UsersGuide/modbase.html> > > ...where "model list" is the same dialog as used to show Modeller results. Now that ChimeraX has a Modeller Results dialog for displaying the output from Comparative Modeling and Model Loops, could consider adding analogous Modbase fetch capability. > > I can make a ticket if anybody thinks that's a good idea. > > Elaine > > >> Begin forwarded message: >> >> From: Tom Goddard via ChimeraX-users <chimerax-users(a)cgl.ucsf.edu <mailto:chimerax-users@cgl.ucsf.edu>> >> Subject: Re: [chimerax-users] Any interest in reading ModelArchive metadata from mmCIF files? >> Date: November 12, 2021 at 2:56:49 PM PST >> To: Ben Webb <ben(a)salilab.org <mailto:ben@salilab.org>> >> Cc: ChimeraX Users Help <chimerax-users(a)cgl.ucsf.edu <mailto:chimerax-users@cgl.ucsf.edu>> >> Reply-To: Tom Goddard <goddard(a)sonic.net <mailto:goddard@sonic.net>> >> >> >> So it looks like only ModBase would currently benefit from ChimeraX reading template sequences and alignments. I do not think it would be too hard to implement it. I've made a ChimeraX feature request for that >> >> https://www.rbvi.ucsf.edu/trac/ChimeraX/ticket/5601 <https://www.rbvi.ucsf.edu/trac/ChimeraX/ticket/5601>

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Any interest in reading ModelArchive metadata from mmCIF files?
by Ben Webb 12 Nov '21

12 Nov '21

Do you have any plans to extend ChimeraX's mmCIF reader to parse and display metadata on theoretical models, such as quality scores or the alignments to template structures? The folks at PDB have recently done a lot of work to standardize this metadata in the MA mmCIF dictionary: https://mmcif.wwpdb.org/dictionaries/mmcif_ma.dic/Index/ The dictionary has already been adopted by ModelArchive (e.g. AlphaFold2 models) and by ModBase (Modeller models) and I believe that other repositories such as SwissModel are also moving in that direction. See e.g. mmCIF downloads at https://www.modelarchive.org/doi/10.5452/ma-bak-cepc-0250 https://modbase.compbio.ucsf.edu/modbase-cgi/model_search.cgi?databaseID=Q1… (My ulterior motive: we've previously built Chimera web data files to download a ModBase model and the accompanying alignment, and display them in Chimera; now that this data is embedded in the mmCIF file, in principle ChimeraX could do this itself in a less clunky and not ModBase-specific fashion.) Ben -- ben(a)salilab.org https://salilab.org/~ben/ "It is a capital mistake to theorize before one has data." - Sir Arthur Conan Doyle

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Fit in map sequentially with global search?
by Oliver Clarke 12 Nov '21

12 Nov '21

Hi, I frequently use the "global search" option of fitmap in chimera to identify the orientation of proteins or fragments in my map. Fitmap has an option, "sequence", allowing the sequential fitting of multiple structures to a map, after subtracting the density corresponding to the previous fit, but this is not compatible with global search. Would it be possible to add an option to fitmap in ChimeraX such that it considers clashes with designated existing models? This would be useful when one is trying to fit the density of a weakly occupied binding partner in the context of a larger known structure. Presently, when one uses fitmap with global search in such a case, the binding partner frequently gets sucked in to the stronger density for the host protein, even when the density for the binding partner is visually clear. Cheers Oli

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ChimeraX-users November 2021