June 2025 - ChimeraX-users - RBVI Mailing Lists

viewing mmcif reflection files with multiple blocks
by Kreitler, Dale 26 Jun '25

26 Jun '25

Hi, I'm working with mmcif files that contain multiple blocks of x-ray structure factors, such as those that arise from x-ray fragment screening campaign PDB group depositions. With the chimerax clipper plugin I'm able to open these mmcif files and associate the structure factors with the corresponding model, but this action only works for the first block in the file which contains the output of the refinement program. I'd like to access the other blocks which contain the binding event/evidence density maps. Would someone be able to point me in the right direction for accessing the additional blocks? Thank you, Dale ============================= Dale Kreitler AMX Beamline Scientist National Synchrotron Light Source II Building 745, Rm. 5L143 Upton, NY 11973 631-344-7318

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ChimeraX version 1.10 has been released
by Elaine Meng 26 Jun '25

26 Jun '25

UCSF ChimeraX version 1.10 has been released! ChimeraX includes user documentation and is free for noncommercial use. Download for Windows, Linux, and MacOS from: https://www.rbvi.ucsf.edu/chimerax/download.html Updates since version 1.9 (December 2024) include: - Boltz machine-learning structure prediction of proteins, nucleic acids, and their complexes with ligands - Plotting measurements (distances, angles, SASA) across a trajectory - "aniso" command for displaying anisotropic B-factors as ellipsoids - Find Cavities GUI enhancements such as changing calculation parameters - Profile Grid condensed view for large sequence alignments - multiple sequence alignment server updated to MUSCLE v5 - structure superposition based on an existing sequence alignment - sequence-viewer region browser now includes UniProt feature info For details, please see the ChimeraX change log: https://www.rbvi.ucsf.edu/trac/ChimeraX/wiki/ChangeLog On behalf of the team, Elaine ----- Elaine C. Meng, Ph.D. UCSF Chimera(X) team Department of Pharmaceutical Chemistry University of California, San Francisco

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Ca-trace
by Das, Abhinaba 26 Jun '25

26 Jun '25

Dear community, Is there a way to show only the Ca backbone trace? Looks like this was a while ago in the forum (https://mail.cgl.ucsf.edu/mailman/archives/list/chimerax-users@cgl.ucsf.edu…) so was wondering if it is now possible to do so in ChimeraX. Thanks, Abhi

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Query for Volume viewer
by Akash Singh 26 Jun '25

26 Jun '25

Hi, I'm a researcher from India. I have been trying to make some EM fitting image with model protein. There is no Volume viewer option for Line smoothening, surface smoothening or square mesh to triangle mesh conversion. Also surface smoothening problem. I have been trying to execute through the command line, but it doesnt work . Can you help me regarding command line code for following Mesh Line smoothing Mesh surface smoothening Dim transparency The suite is ChimeraX or ChimeraX 1.9 Regards, Akash Singh

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Sponsorship Request: Samsung Odyssey 3D (G90XF) Monitor for ChimeraX Development
by Michaelis, Andre Clemens 25 Jun '25

25 Jun '25

Dear Samsung Sponsorship Team, I am writing to request consideration for a sponsorship in the form of a single Samsung Odyssey 3D (G90XF) monitor to support the continued development of ChimeraX, a powerful open-source visualization software used by scientists and researchers worldwide. About ChimeraX: ChimeraX is a state-of-the-art molecular visualization program developed by the Resource for Biocomputing, Visualization, and Informatics at the University of California, San Francisco. This software is freely available for both academic and industrial use, serving thousands of researchers globally who work in fields such as: * Protein Design * Structural biology * Drug discovery and pharmaceutical research * Materials science * Biochemistry and molecular biology education The software specializes in rendering complex 3D molecular structures with exceptional clarity and detail, making it an essential tool for scientific research and education. Why the Samsung Odyssey 3D (G90XF) Monitor? The advanced 3D capabilities of your Odyssey 3D monitor would significantly enhance ChimeraX's development in the following ways: 1. Improved Spatial Visualization: The monitor's 3D technology would allow our developers to implement and test more realistic spatial rendering of molecular structures. 2. Enhanced User Experience: With proper support for your 3D technology, ChimeraX users worldwide would benefit from unprecedented depth perception when analyzing complex molecular structures. 3. Technical Innovation: The integration would enable new visualization features that are currently impossible with standard displays. Mutual Benefits This sponsorship opportunity offers several advantages for Samsung: * Exposure to Scientific Community: Your technology would be featured in a widely-used scientific application, showcasing its capabilities to companies, researchers and institutions globally. * Market Expansion: As ChimeraX adds support for your monitor's 3D capabilities, it would create a compelling reason for industry, laboratories, and research institutions worldwide to purchase the Samsung Odyssey 3D. * Technology Leadership: This partnership would demonstrate Samsung's commitment to supporting scientific advancement and innovation. Our Request We are requesting a single Samsung Odyssey 3D (G90XF) 27" monitor to integrate proper support for its 3D capabilities into ChimeraX. Once implemented, we could: * Acknowledge Samsung's contribution in our documentation and release notes * Provide regular updates on the implementation progress * Share user feedback and testimonials about the enhanced experience Thank you for considering this sponsorship opportunity. I believe this collaboration would be valuable for both Samsung and the global scientific community and industries that rely on ChimeraX. We look forward to discussing this proposal further and would be happy to provide any additional information you may require. Sincerely, André Michaelis, ChimeraX customer https://www.cgl.ucsf.edu/chimerax/ André Michaelis —————————————————— André Michaelis Max-Planck Institute of Biochemistry Dept. Proteomics and Signal Transduction Am Klopferspitz 18<x-apple-data-detectors://3/> D-82152 Martinsried<x-apple-data-detectors://3/>/Munich Phone: +49 89 8578 2213<tel:+49%2089%208578%202213> email: michaelis(a)biochem.mpg.de<mailto:michaelis@biochem.mpg.de> http://www.biochem.mpg.de/mann/<http://www.biochem.mpg.de/mann/>

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Re: Glasses-free Samsung Odyssey 3D Monitor support
by Michaelis, Andre Clemens 25 Jun '25

25 Jun '25

Hi Tom and Greg, Thanks so much for the infos. I am torn between the 2 ‘normal’ displays from Samsung or Acer, which are also cheaper. Quite early I guess, but I notice some general excitement so future developments are not of the table i assume? About the SBS: I noticed that it is a little complicated to get there, but it is possible to get ChimeraX into full screen, SBS on and all menus and bars including command prompt hidden. Isn’t this view a perfect SBS picture that the Samsung monitor should be able to use? Only question in this case would be if fullscreen mode is recognized as such by the monitor. If yes, shortcut to get there would be nice. [IMG_0568.jpeg] About the openXR: I found the following about the Samsung monitor in a review online: ‘I want to take a moment to talk about XRGameBridge and VRto3D. This is a reshade plugin that you use to mod your Steam VR instance so that, along with VRto3D makes your SR display mimics a VR headset in a sense. With those tools alone you can launch steam VR games in 3D on your Spatial Reality (SR) display. What really excites me about this is that the developers managed to activate the monitors 3D mode without any special sdk from Samsung. I didn't realize this at the time but it seems like all SR displays like Acer spatial labs and Lenovo Thinkvision 3D seem to use basically the same SR sdk, which may be made my Leia (makes of the lume pad and their own SR displays). This means that it might be possible for any developer to make some tools or apps to help round out this monitor’ Wouldn’t that be a possibility to get VR working? A mode to just isolate the main window and drag it and full screen it to the 3D monitor would be helpful, but it sounded like hard to realize. Thanks again Best André Am 22.06.2025 um 19:21 schrieb Tom Goddard <goddard(a)sonic.net>: Hi Andre, We discussed the Samsung Odyssey 3D on the ChimeraX mailing list last month https://mail.cgl.ucsf.edu/mailman/archives/list/chimerax-users@cgl.ucsf.edu… The display manual does not mention OpenXR, only side-by-side stereo. https://downloadcenter.samsung.com/content/UM/202506/20250612182444761/BN81… does not support fullscreen side-by-side stereo so it won't work with this display. We might in the future add support. Tom On Jun 22, 2025, at 11:14 AM, Greg Pintilie via ChimeraX-users <chimerax-users(a)cgl.ucsf.edu> wrote: Hi Andre, I can pass some information since I’ve been looking into this with Tom Goddard a lot recently, not with the Samsung monitor, but with two others that have the same technology: Tom has the ChimeraX latest builds working with the "Sony 3D Spatial Reality Display” monitors. You just have to connect the monitor, run ChimeraX and then type “xr on” in the command line. We also tried the "Acer 3D SpatialLabs ViewPro 27”, but Tom found bugs in their openXR implementation, so the latest ChimeraX is not working with this yet, but likely there will be a fix very soon. Tom has a modified version of ChimeraX that works with this monitor, but it is not released yet. You can google the above names, I would put links but they seem to vary by region. I am a huge fan of both of the above two monitors. The 3D effect is great, very useful for modeling and viewing complex models and 3D maps. Also super easy to run, compared to previous technologies. There are still some quirks, like that you have to interact with the 3D view on your main monitor, not on the 3D monitor directly. There are no tests yet of ChimeraX with the Samsung monitor, that I know of. It looks really nice, but I didn’t find any info on whether it supports openXR or not, which is what ChimerX is using. We had some discussion on this list recently about whether it’s worth using the SBS mode, which it apparently supports, but that mode has even more quirks, so would not encourage. Greg P. On Jun 21, 2025, at 11:54 AM, Michaelis, Andre Clemens via ChimeraX-users <chimerax-users(a)cgl.ucsf.edu> wrote: Dear ChimeraX Team, I was wondering if you had experience with the glasses-free Samsung Odyssey 3D monitor or know if ChimeraX is supporting it? Maybe you got already feedback from some users, as this seems like the perfect solution to work with! <https://www.samsung.com/us/monitors/gaming/27-inch-odyssey-3d-g90xf-4k-165h…> <http://samsung-logo-1-1.jpg> Odyssey G9 27" 3D 4K Gaming Monitor with Speakers<https://www.samsung.com/us/monitors/gaming/27-inch-odyssey-3d-g90xf-4k-165h…> http://samsung.com<https://www.samsung.com/us/monitors/gaming/27-inch-odyssey-3d-g90xf-4k-165h…> Thank you Best, André —————————————————— André Michaelis Max-Planck Institute of Biochemistry Dept. Proteomics and Signal Transduction Am Klopferspitz 18 D-82152 Martinsried/Munich Phone: +49 89 8578 2213 email: michaelis(a)biochem.mpg.de<mailto:michaelis@biochem.mpg.de> http://www.biochem.mpg.de/mann/<http://www.biochem.mpg.de/mann/> _______________________________________________ ChimeraX-users mailing list -- chimerax-users(a)cgl.ucsf.edu To unsubscribe send an email to chimerax-users-leave(a)cgl.ucsf.edu Archives: https://mail.cgl.ucsf.edu/mailman/archives/list/chimerax-users@cgl.ucsf.edu/ _______________________________________________ ChimeraX-users mailing list -- chimerax-users(a)cgl.ucsf.edu To unsubscribe send an email to chimerax-users-leave(a)cgl.ucsf.edu Archives: https://mail.cgl.ucsf.edu/mailman/archives/list/chimerax-users@cgl.ucsf.edu/

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Request for Mathematical Details or Source Code for Helix Axis and Interhelical Distace/Angle Calculations in Chimera
by pupadhyay21 25 Jun '25

25 Jun '25

Respected Sir/Madam, My name is Prashant Upadhyay, and I am currently pursuing a Ph.D. in Bioinformatics and Molecular Dynamics Simulation at the Indian Institute of Technology Kanpur (IIT Kanpur), India. As part of my research, I am analyzing the structural dynamics of helical membrane proteins using molecular dynamics simulations. I have been using UCSF Chimera extensively for structural analysis. Specifically, I have been utilizing the Structure Analysis → Axes/Planes/Centroids tool to calculate the helix axes of selected helices in my protein of interest. When I select two helices, the Reply Log provides the interhelical distance and angle between the computed axes. This functionality has been incredibly useful for analyzing static structures. To extend this to a dynamic context, I am interested in applying the same axis and angle calculation to each frame of an MD trajectory. For this, I would greatly appreciate it if you could share the mathematical methodology or the relevant portion of the source code that Chimera uses to compute: 1)The helix axis from selected residues 2)The angle and the shortest distance between two helix axes My aim is to replicate this analysis programmatically over the entire simulation trajectory. Any guidance, reference, or code snippet you could provide would be immensely helpful. Thank you, Prashant Upadhyay Ph.D. Student Department of Biological Sciences and Bioengineering Indian Institute of Technology Kanpur (IIT Kanpur)

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substitution conflicts between perframe subcommands and runscript arguments
by d＠wolf.gdn 24 Jun '25

24 Jun '25

Hey there So I'm invoking some rendering jobs like this: `cx --script "./a.cxc 2 3"` Inside a.cxc there's something like: ``` perframe "coordset #1 $1" frames 24 format %03d range $1,$2,1 showCommands true ``` Now the problem is that the script arguments in the script are all being replaced So $1 in the perframe subcommand becomes "2" just like in the range option I couldn't find documentation on a built-in escape mechanism yet I tried "\$1" and "$$1" w/o success tho Alternatives that I see are generating a list of script files that don't rely on substitution and have hard-coded frame offsets or ig I could also explore python scripting Wanted to ask if there's a way to do it with escaping tho Thanks!

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How to save coordinates of a fit atomic model
by Tom Goddard 24 Jun '25

24 Jun '25

Hi Peter, To save an atomic model after you have moved it to fit into a map use menu File / Save..., file type mmCIF, uncheck "Use untransformed coordinates", and save. If you have multiple models open it won't show that option and instead will show "Save relative to model: <menu>" and choose to save relative to the map. Or if you want to use a command just use "save myfitmodel.cif". If you have multiple models open you have to specify in the command which to save "save myfitmodel.cif model #3". Please ask questions about how to use ChimeraX on the mailing list and not in bug reports. That way others can benefit from the answers. Tom > Hi Tom, > I’m having an issue in ChimeraX and would appreciate your help. > I aligned an atomic model with a cryo-EM map and would like to save the > atomic model in its aligned position, so that when I reopen both the map > and the model later, they appear properly aligned. > I tried using the GUI to save the transformed atomic model in different > formats, but when I reopened the files, the alignment was lost. > I also tried using the save command, but encountered the same issue — the > model was saved in its original, unaligned coordinates. > Finally, I attempted to save the session as a .cxs file and open it in > Chimera, but Chimera cannot open .cxs session files from ChimeraX. > Could you please tell me exactly what I need to do to save the atomic > model with its current (transformed) coordinates so that it stays aligned > with the map when reloaded? > Thank you very much for your help. > Wishing you a great day, > Peter

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Adding chain description and Uniprot accession number to a pdb file
by Rayees Mattoo 23 Jun '25

23 Jun '25

Hi, I want to add chain description and Uniprot accession ID to my PDB file which contains many chains (chain IDs from A-M). Please suggest a way to add those details in chimeraX? Best

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