- ChimeraX-users - RBVI Mailing Lists

session files question
by Krishnan Raman 06 May '24

06 May '24

I have two large session files (1-2 GB). Is there any way to combine them ? thanks Krish CONFIDENTIALITY NOTICE This email, including any attachments, may contain confidential or legally privileged information that is intended only for the individual or entity to whom it is addressed. If you are not the intended recipient, please be advised that any dissemination, distribution or copying of this email and any attachment is strictly prohibited. If you have received this email in error, please reply to the sender so that BioCryst Pharmaceuticals, Inc. can take corrective measures and then permanently delete this email and any attachment, including any printed copies. Thank you.

2 2

Error when opening multiple tiff stacks (32-bit)
by Christophe Leterrier 03 May '24

03 May '24

Hi, I have two 32-bit tiff stacks (generated by ImageJ) and I try to open both to overlay two channels. When opening the second one or trying to open both at the same time (see paths below), I get the following error with the latest stable and daily ChimeraX macOS versions: UCSF ChimeraX version: 1.7.1 (2024-01-23) © 2016-2023 Regents of the University of California. All rights reserved. How to cite UCSF ChimeraX open "/Users/christo/Travail/Data NSTORM/230811 Patt#56/Figure 4 Article (actin DNA-Paint bass)/3um aligned 3D/Recs TS ROIs 3um aligned (Gxy4z4)/Roi002_C2_N04_ch1_ph647_bas643_sypto_map_3D_48K_DC1C_(22688,12672)_TS3D.tif" "/Users/christo/Travail/Data NSTORM/230811 Patt#56/Figure 4 Article (actin DNA-Paint bass)/3um aligned 3D/Recs TS ROIs 3um aligned (Gxy4z4)/Roi002_C2_N04_ch2_ph647_bas643_sypto_map_3D_7,63K_DC1C_transfo_(22688,12672)_TS3D.tif"Traceback (most recent call last): File "/Applications/ ChimeraX-1.7.1.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/chimerax/open_command/dialog.py", line 334, in _qt_safe run(session, "open " + " ".join([FileNameArg.unparse(p) for p in paths]) + ("" File "/Applications/ ChimeraX-1.7.1.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/chimerax/core/commands/run.py", line 49, in run results = command.run(text, log=log, return_json=return_json) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/Applications/ ChimeraX-1.7.1.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/chimerax/core/commands/cli.py", line 2908, in run result = ci.function(session, **kw_args) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/Applications/ ChimeraX-1.7.1.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/chimerax/open_command/cmd.py", line 131, in cmd_open models = Command(session, registry=registry).run(provider_cmd_text, log=log)[0] ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/Applications/ ChimeraX-1.7.1.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/chimerax/core/commands/cli.py", line 2908, in run result = ci.function(session, **kw_args) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/Applications/ ChimeraX-1.7.1.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/chimerax/open_command/cmd.py", line 191, in provider_open models, status = collated_open(session, None, paths, data_format, _add_models, log_errors, ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/Applications/ ChimeraX-1.7.1.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/chimerax/open_command/cmd.py", line 513, in collated_open return remember_data_format() ^^^^^^^^^^^^^^^^^^^^^^ File "/Applications/ ChimeraX-1.7.1.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/chimerax/open_command/cmd.py", line 484, in remember_data_format models, status = func(*func_args, **func_kw) ^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/Applications/ ChimeraX-1.7.1.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/chimerax/map/__init__.py", line 182, in open return open_map(session, path, format=_name, **kw) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/Applications/ ChimeraX-1.7.1.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/chimerax/map/volume.py", line 3621, in open_map smodels, smsg = open_grids(session, sgrids, name, **kw) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/Applications/ ChimeraX-1.7.1.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/chimerax/map/volume.py", line 3723, in open_grids v.update_drawings() File "/Applications/ ChimeraX-1.7.1.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/chimerax/map/volume.py", line 813, in update_drawings self.image_levels, self.image_colors = self.initial_image_levels() ^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/Applications/ ChimeraX-1.7.1.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/chimerax/map/volume.py", line 633, in initial_image_levels mstats = self.matrix_value_statistics() ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/Applications/ ChimeraX-1.7.1.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/chimerax/map/volume.py", line 1734, in matrix_value_statistics matrices = self.displayed_matrices(read_matrix) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/Applications/ ChimeraX-1.7.1.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/chimerax/map/volume.py", line 1769, in displayed_matrices matrices.append(self.matrix(read_matrix)) ^^^^^^^^^^^^^^^^^^^^^^^^ File "/Applications/ ChimeraX-1.7.1.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/chimerax/map/volume.py", line 1252, in matrix m = self.region_matrix(r, read_matrix) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/Applications/ ChimeraX-1.7.1.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/chimerax/map/volume.py", line 1276, in region_matrix m = d.matrix(origin, size, step, progress, from_cache_only) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/Applications/ ChimeraX-1.7.1.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/chimerax/map_data/griddata.py", line 317, in matrix m = self.read_matrix(ijk_origin, ijk_size, ijk_step, progress) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/Applications/ ChimeraX-1.7.1.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/chimerax/map_data/imagestack/imagej_tiff.py", line 74, in read_matrix a = pi.planes_data(klist, cc, ch, self.time) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/Applications/ ChimeraX-1.7.1.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/chimerax/map_data/imagestack/imagej_tiff.py", line 199, in planes_data a = tif.asarray(key = plist) ^^^^^^^^^^^^^^^^^^^^^^^^ File "/Applications/ ChimeraX-1.7.1.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/tifffile/tifffile.py", line 4272, in asarray pages = pages._getlist(key) ^^^^^^^^^^^^^^^^^^^ File "/Applications/ ChimeraX-1.7.1.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/tifffile/tifffile.py", line 7532, in _getlist pages = [getitem(i, validate=validhash) for i in key] ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/Applications/ ChimeraX-1.7.1.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/tifffile/tifffile.py", line 7532, in <listcomp> pages = [getitem(i, validate=validhash) for i in key] ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/Applications/ ChimeraX-1.7.1.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/tifffile/tifffile.py", line 7578, in _getitem self._seek(key) File "/Applications/ ChimeraX-1.7.1.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/tifffile/tifffile.py", line 7481, in _seek raise IndexError('index out of range') IndexError: index out of range IndexError: index out of range File "/Applications/ ChimeraX-1.7.1.app/Contents/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/tifffile/tifffile.py", line 7481, in _seek raise IndexError('index out of range') See log for complete Python traceback. Any idea of what is going wrong?

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[Query] Possible to control tool panel size programmatically?
by leeyang+chimerax＠gmail.com 03 May '24

03 May '24

Hi, Not a feature request but a query. Is there currently a way to change tool panel sizes with a command, either in absolute terms or as a fraction of another parameter value? Cheers, Yang

3 4

Installing ChimeraX on Ubuntu 24.04 LTS
by mborgnia＠gmail.com 02 May '24

02 May '24

Hi all, I got a shiny new machine with Ubuntu 24.04 LTS, unfortunately the regular repositories do not include libffi7 and that causes a failure when installing the 22.04 package. I have also tried to run the generic Linux 64 bit version but fails to load because the libffi.so.6 file is not found. Any ideas on how to proceed? Thanks Mario J. Borgnia

3 6

Using chimerax library code outside of the GUI
by Artie Kushner 02 May '24

02 May '24

Hi, I apologize sincerely since I imagine this comes up often on the mailing list. I'm basically wondering if it's possible to import just the `core` functionality from a chimerax installation into a custom python environment and bypass the GUI and the binary completely. Example: I don't think it matters whether it's linux, mac, or source build, but let's say i installed a clean chimerax via my package manager (`yay i chimerax`). It's at `/opt/chimerax` and looks like this: (venv) ᢹ ritual.rtviii[ /opt/chimerax ] ls -la total 24 drwxr-xr-x 6 root root 4096 May 1 16:08 . drwxr-xr-x 10 root root 4096 May 1 16:58 .. drwxr-xr-x 4 root root 4096 May 1 16:51 bin drwxr-xr-x 8 root root 4096 May 1 16:51 include drwxr-xr-x 4 root root 4096 May 1 16:51 lib drwxr-xr-x 6 root root 4096 May 1 16:51 share If I launch `chimerax` at the command line, i get a functional GUI etc. It works. I create a fresh custom `virtualenv` with the same python that this chimerax ships: virtualenv --python='/opt/chimerax/bin/python3.11' venv Then i do something ugly in the name of science: i symlink the chimerax folder from the installation into my virtualenv: ln -s /opt/chimerax/lib/python3.11/site-packages/chimerax /home/rtviii/dev/try_chimerax/venv/lib/python3.11/site-packages/chimerax i also tried: for P in $(ls /opt/chimerax/lib/python3.11/site-packages/); do ln -s /opt/chimerax/lib/python3.11/site-packages/$P /home/rtviii/dev/try_chimerax/ venv/lib/python3.11/site-packages/$P; done This enables me to import chimerax modules into my python code that uses this virtualenv: ```/home/rtviii/dev/try_chimerax/test.py from chimerax.core.commands import run from chimerax.core.session import Session import chimerax.mmcif.mmcif as mmcif s = Session("Hi") print(s) run(s,"open 1ubq.cif") ``` However, this is where i'm struggling a little to use any actual functionality (especially interested in cutting, merging structures and operations treating density maps and mmcif structures) because the Session wouldn't initialize well: ``` <chimerax.core.session.Session object at 0x70472673b5d0> NOTE: Traceback (most recent call last): File "/home/rtviii/dev/try_chimerax/test.py", line 9, in <module> run(s,"open 1ubq.cif") File "/home/rtviii/dev/try_chimerax/venv/lib/python3.11/site- packages/chimerax/core/commands/run.py", line 49, in run results = command.run(text, log=log, return_json=return_json) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/home/rtviii/dev/try_chimerax/venv/lib/python3.11/site-packages/chimerax/core/commands/cli.py", line 2849, in run _compute_available_commands(session) File "/home/rtviii/dev/try_chimerax/venv/lib/python3.11/site-packages/chimerax/core/commands/cli.py", line 2431, in _compute_available_commands ts.register_available_commands(session.logger) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ AttributeError: 'NoneType' object has no attribute'register_available_commands' BUG: AttributeError: 'NoneType' object has no attribute'register_available_commands' File "/home/rtviii/dev/try_chimerax/venv/lib/python3.11/site- packages/chimerax/core/commands/cli.py", line 2431, in _compute_available_commands ts.register_available_commands(session.logger) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ _See log for complete Python traceback._ ``` I had some success with a similar approach in PyMol in this regard, but can't quite get this to work in ChimeraX. I really appreciate any advice for achieving this scripting decoupling from GUI/binary if that's possible at all: - either how to "pull in" ChimeraX library code properly (i realize mine is an ugly hack) - how to use library code otherwise - how to bypass the dependence of a lot of commands on the Session object or how to initialize it outside of the gui properly: an example of how to use selections to open a local density map and perform a smoothing, for example. Kindest regards and huge thanks for the monumental application. Artem, UBC Vancouver

2 1

Problem visualizing hydrogen bonds during a trajectory
by Ute Roehrig 02 May '24

02 May '24

Hello, I'm trying to visualize the hydrogen bonds of a small molecule in water over the trajectory of a molecular dynamics simulation, using the following commands: alias evalhb hide solvent; hb :LIG reveal true coordsets false makePseudobonds true ; view perframe evalhb; coordset #1 1,20 holdsteady :LIG; wait 20; ~perframe However, this does not work as expected. Could you please help me with this issue? Thank you, Ute

2 2

Visualizing PAE contact lines between more than two peptides
by David S. Fay 30 Apr '24

30 Apr '24

Greetings, Was wondering if it’s possible to simultaneously display PAE contact lines for more than two peptides? For example, all contacts between A and B AND B and C etc. Couldn’t find anything on it and have already made the obvious attempts such as "alphafold contacts /A to /C AND /B to /C distance 6” Thanks! David

2 2

Schematic
by Das, Abhinaba 30 Apr '24

30 Apr '24

Hi all, I don’t think it is possible to draw this kind of schematic representation (panel b) in ChimeraX, is it? [cid:image001.png@01DA9A41.C6E2E040] Thanks, Abhi

3 2

Alphafold predicton using ChimeraX
by Chang, Jufang 29 Apr '24

29 Apr '24

Dear Sir, When I tried to use alphafold prediction with ChimeraX, I got this error message. I alreday download the latest version 1.7.1 (2024-01-23). But I still got the same error message. Could you please suggest me what to do the next to fix this? Thank you Ju-Fang AlphaFold Prediction Requires Newer ChimeraX Alphafold prediction requires a ChimeraX daily build from March 19, 2024 or later. The ChimeraX AlphaFold prediction service was broken by an update on Google Colab on March 14, 2024. ________________________________ The materials in this message are private and may contain Protected Healthcare Information or other information of a sensitive nature. If you are not the intended recipient, be advised that any unauthorized use, disclosure, copying or the taking of any action in reliance on the contents of this information is strictly prohibited. If you have received this email in error, please immediately notify the sender via telephone or return mail.

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running AlphaFold predictions in ChimeraX
by Elaine Meng 29 Apr '24

29 Apr '24

> On Apr 29, 2024, at 9:31 AM, Chang, Jufang via Chimera-users <chimera-users(a)cgl.ucsf.edu> wrote: > > Dear Greg > > Recently I can not use the ChimerX to do the alphafold prediction. The error message is some connection to the colab is broken sine March 2024. I am wondering when this feature of ChimeraX will come back? > > Thank you > > Ju-Fang Hello Ju-Fang, As Greg said, you should use the address chimerax-users(a)cgl.ucsf.edu for ChimeraX questions, not chimera-users(a)cgl.ucsf.edu which is for Chimera, and put some description of the current issue in the email subject line. If you get an error running the AlphaFold prediction in ChimeraX and you think it is a bug, please use ChimeraX menu Help... Report a Bug and include a description and your email address. As far as I knew it was working, so we wouldn't know what the problem is for you without more information. Also here are some common issues and limitations of running these predictions: <https://rbvi.ucsf.edu/chimerax/docs/user/tools/alphafold.html#caveats> I hope this helps, Elaine ----- Elaine C. Meng, Ph.D. UCSF Chimera(X) team Resource for Biocomputing, Visualization, and Informatics Department of Pharmaceutical Chemistry University of California, San Francisco

2 3

Unroll radius?
by Ricardo Righetto 29 Apr '24

29 Apr '24

Hi, We've been using the 'volume unroll' command on a cylindrical structure, and while we do get some very decent results with the defaults, we want to do a systematic comparison with values entered manually for the inner and outer radius. Specifically, I'd like to know if I can get ChimeraX to report what minimum and maximum radii it is currently using for unrolling the volume? Currently, all I get in the reply log is this: volume unroll #1 Opened unrolled SPA_density.mrc as #2, grid size 68,697,492, pixel 1.22,1.2,1.2, shown at step 1, values float32 https://www.cgl.ucsf.edu/chimera/data/downloads/1.8/docs/UsersGuide/midas/v… From the help here it says: > (...) and inner and outer radii *r1* and *r2* (defaults are 90% of the > smallest radius and 110% of the largest radius of the displayed isosurface, > respectively, given the cylinder center and axis direction). Since this is a high-resolution cryo-EM map with many intricate features, it's hard to visually find exactly what are the smallest and largest radii currently displayed at the isosurface. So we'd like to know what ChimeraX is finding by itself and compare it to our measurements. Any tips are appreciated. Thank you! -- Ricardo Diogo Righetto

2 4

Glb files
by Rowe-Magnus, Dean 28 Apr '24

28 Apr '24

Hello, Can you please tell me how to save a .glb file as a .pdb so that I can use Matchmaker to align the structures? Thank you, Dean

2 1

How to show van der Waals surface
by 我就要柠乐 26 Apr '24

26 Apr '24

Dear Sir/Madam         Recently, I have been using ChimeraX for graphical analysis, and I find the software to be very user-friendly and efficient. I am currently facing a challenge where I want to display the van der Waals surface of a residue, similar to this illustration（https://doi.org/10.1038/s41467-022-31526-7）. However, I am not quite sure how to write the command correctly. I have looked up the commands on the official website and tried using these two:surface #1:230； surface style mesh. The bottom is open （the rad circle）, but I would like to have a complete van der Waals surface with closed openings, similar to what is typically seen in the literature. I would appreciate your assistance. Thank you！                                                                                                                       yours  sincerely                                                                                                                       yiwen 我就要柠乐 790639436(a)qq.com  

2 2

Question about visualisation of DNA structure
by Enrico Martinez 26 Apr '24

26 Apr '24

Dear Chimera-X users, I have a question about the visualisation of the DNA structure obtained after tleap processing for Amber. As I have noticed, due to the renaming of the DNA residues, some of the sugar parts are not correctly recognised by Chimera-X (see the attached screenshot) and so these elements are only displayed as organic ligands. Would it be possible to change its style using some commands, assuming that the names of the residues located at the terminal parts of the DNA helix are DC5, DG3 and DT5, DT3 (so that Amber adds numbers to them)? Would it be possible to change the style of all the residues e.g. showing them ass ring fills or like a color bricks (default vizualisation which looks very cool!) using selection expressions like :DT*,DG*,DC*,DA* ? Many thanks in advance ! Enrico

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Add options to snapshot command
by Jaremko, Matt Joseph 26 Apr '24

26 Apr '24

Hello ChimeraX Team, Can you add option to snapshot command like transparentBackground and height to allow more customization of this convenient tool? Thank you, Matt Matt J. Jaremko, Ph.D. (He|Him) Senior Scientist | Protein & Structural Chemistry Merck Research Labs | 126 E Lincoln Ave | 80B 1012 | Rahway, NJ 07065 Cell: 808.741.6277 | Email: matt.jaremko(a)merck.com<mailto:matt.jaremko@merck.com> This e-mail message, together with any attachments, contains information of Merck & Co., Inc. (126 East Lincoln Ave., P.O. Box 2000, Rahway, NJ USA 07065) and/or its affiliates, that may be confidential, proprietary copyrighted and/or legally privileged. (Direct contact information for affiliates is available at - Contact us - MSD<https://www.msd.com/contact-us/>.) It is intended solely for the use of the individual or entity named on this message. If you are not the intended recipient, and have received this message in error, please notify us immediately by reply e-mail and then delete it from your system.

3 3

palette command
by Cairns, Claudia Anna 26 Apr '24

26 Apr '24

Dear sir or madam, I try to apply the palette command to change the color range of the mlp command. Unfortunatelly i always get an error. For "palette rainbow" for example I get: rainbow Unknown command: palette rainbow Can you please help me? Sincerely, Claudia Cairns M.Sc. (Biotechnology) Department 'Applied and Molecular Microbiology' Institute of Biotechnology - TIB 4/4-1 Technische Universität Berlin Gustav-Meyer-Allee 25 D-13355 Berlin Phone: +49-(0)30-314-72827 E-mail: c.feurstein(a)tu-berlin.de<mailto:carsten.pohl@tu-berlin.de> Web: <http://www.mikrobiologie.tu-berlin.de> https://www.tu.berlin/mikrobiologie/

2 1

Reconstruction of missed loop fragments
by Enrico Martinez 26 Apr '24

26 Apr '24

Dear Chimera-X user! I am preparing a model of GPCR protein for the molecular dynamics simulation. In this structure there is a loop fragment of 10-20 residues which is missed. Is it possible to reconstruct it (e.g. based on the sequence information or alternatively just add manually the missing fragment) using some tool of Chimera-X e.g. combining with the bond command ? Many thanks in advance ! Enrico

2 7

Greek characters
by Marta Martinez 25 Apr '24

25 Apr '24

Hi guys, I just downloaded a pdb file from AlphaFold DB (AF-P69905-F1-model_v4.pdb). After modifying it with ChimeraX (version 1.6.1 (2023-05-09)) I've saved the modified atomic structure as a cif file. The original pdb file contains this line: COMPND 2 MOLECULE: HEMOGLOBIN SUBUNIT ALPHA; After saving the file as cif format ALPHA is not longer a string but a GREEK character: _entity.pdbx_description "hemoglobin subunit α" Is there any flag in the save command that disables this conversion from plain ASCII to UTF-8? Thank you very much for the answer in advance: MARTA -- Marta Martinez Gonzalez Biocomputing Unit (Lab B13) National Center for Biotechnology-CSIC Darwin, 3. Campus de la Universidad Autonoma de Madrid 28049 Madrid. Spain Tel:+34 915854510 Fax:+34 913720112 E-mail: mmmtnez(a)cnb.csic.es

2 1

atom serial_number is inconsistent with PDB serial numbers in multi-chain structure
by Daniel David Richman 25 Apr '24

25 Apr '24

Hi all, I’ve been debugging an off-by one error in a ChimeraX script I’m working on, which I’ve traced to a apparent inconsistency between the serial_number reported by ChimeraX for an atom and the actual serial number of that atom read/written in PDB format. To reproduce: open 5MJ7 select #1/B:6@CA info atoms sel attribute serial_number ==> atom id /B:6@CA serial_number 2548 but the correct serial number for this atom in 5MJ7.pdb is 2549. Maybe this is because the TER record for chain A takes up one serial number in the PDB file, but ChimeraX doesn’t include it as a numbered atom? Regardless, how can I query ChimeraX for the actual serial number that will be written if I write out a PDB file? Thanks, Daniel

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How to make an MD template for ISOLDE?
by Guillaume Gaullier 25 Apr '24

25 Apr '24

Hi Tristan and chimerax-users, Some time ago I asked the list about modeling PTM and got several helpful answer, including this one: https://mail.cgl.ucsf.edu/mailman/archives/list/chimerax-users@cgl.ucsf.edu… Now, I am working on a structure containing chlorophyll A molecules (residue code CLA) and realized that it won’t work for MDFF in ISOLDE because there is no MD template for it. After trying to manually fit one of these molecules rigidly, I concluded that I would rather spend the rest of the month learning how to make an MD template for it (than next month painstakingly fitting every single molecule manually rigidly). From the message linked above, I think this should be doable because this time it is not a covalent modification on an otherwise parameterized residue, but simply a new ligand (ok, maybe the coordinated Mg2+ makes it a bit more complicated?). I looked up ANTECHAMBER, and also some documentation from OpenMM, but that got me nowhere, mostly because I have little clue what the task really entails. My guess is that I need some program to take the CLA residue in PDB or mmCIF format (which I can easily save from a previous PDB entry) and write out an OpenMM XML file like the one you sent me back then for KCX. Is this correct? The ANTECHAMBER documentation mentions many programs and formats, and I got totally confused. If you have time to elaborate a bit on the specific practical steps to take (including how to supply the final XML file to ISOLDE), that would be super helpful! I can do with pointers to documentation, not afraid to read, but I need help getting oriented. Thank you in advance! Guillaume När du har kontakt med oss på Uppsala universitet med e-post så innebär det att vi behandlar dina personuppgifter. För att läsa mer om hur vi gör det kan du läsa här: http://www.uu.se/om-uu/dataskydd-personuppgifter/ E-mailing Uppsala University means that we will process your personal data. For more information on how this is performed, please read here: http://www.uu.se/en/about-uu/data-protection-policy

2 3

Realsense issues
by Casey Eubanks 24 Apr '24

24 Apr '24

Hey guys, You all helped me a week or so ago getting the Realsense package updated to the new version of chimerax, which I can now download so thats great! But I am now having an issue with running its command "Realsense on" I receive the following errors attached to this email It is having errors processing the trigger and it says it cant resolve the requests. Let me know if I am doing anything wrong or need to make any changes! Thanks, Casey Eubanks Service Desk Specialist MOBILE (205) 617-0581 time zone United States, Central Time Zone (CST) [cid:image001.png@01DA9660.03D4DE80]<https://www.biocryst.com/> "Go Fast, Patients are waiting" If you need immediate IT support please submit a ticket to ITsupport(a)biocryst.com<mailto:ITsupport@biocryst.com> CONFIDENTIALITY NOTICE This email, including any attachments, may contain confidential or legally privileged information that is intended only for the individual or entity to whom it is addressed. If you are not the intended recipient, please be advised that any dissemination, distribution or copying of this email and any attachment is strictly prohibited. If you have received this email in error, please reply to the sender so that BioCryst Pharmaceuticals, Inc. can take corrective measures and then permanently delete this email and any attachment, including any printed copies. Thank you.

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Finding unmodeled blobs in a map
by Guillaume Gaullier 24 Apr '24

24 Apr '24

Hello, With `volume zone` I can show the parts of a map close to an atomic model. Is there a way to do the opposite, i.e. show only the parts of a map that don’t enclose any atoms? This would be already very helpful only as a visualization. But even better would be a way to build a list of markers at the centroids of such unmodeled blobs, to easily navigate to them. Or maybe this is too narrow in scope and better left to ISOLDE? (Sorry Tristan… more feature suggestions…). Thank you, Guillaume När du har kontakt med oss på Uppsala universitet med e-post så innebär det att vi behandlar dina personuppgifter. För att läsa mer om hur vi gör det kan du läsa här: http://www.uu.se/om-uu/dataskydd-personuppgifter/ E-mailing Uppsala University means that we will process your personal data. For more information on how this is performed, please read here: http://www.uu.se/en/about-uu/data-protection-policy

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Adding missing atoms of the DNA structure
by Enrico Martinez 24 Apr '24

24 Apr '24

Dear Chimera-X users I am preparing the structure of the protein-DNA complex for molecular dynamics simulation with Amber. This is the original pdb: https://www.rcsb.org/structure/5FKW When I try to parametrize it the tleap shows the following error because of the absence of some atoms from the phosphate: FATAL: Atom .R<DG5 733>.A<P 32> does not have a type. FATAL: Atom .R<DG5 733>.A<OP1 33> does not have a type. FATAL: Atom .R<DG5 733>.A<OP2 34> does not have a type. FATAL: Atom .R<DG5 758>.A<P 32> does not have a type. FATAL: Atom .R<DG5 758>.A<OP1 33> does not have a type. FATAL: Atom .R<DG5 758>.A<OP2 34> does not have a type. Would it be possible to use some commands of the Chimera-X to automatically repair this part of the DNA by adding missing atoms ? Thank you in advance ! Enrico

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Cutting out an asymmetric unit from the map
by Das, Abhinaba 23 Apr '24

23 Apr '24

Hi! I was wondering if there is a sequence of commands one could use to extract an asymmetric unit from the original map after roughly fitting the model into it. The positions of these extracted maps should of course be preserved and should on the same grid. One can then better fit the model in this extracted ASU density. Thanks in advance for any guidance. Abhi

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Lighting options in ChimeraX
by Elaine Meng 22 Apr '24

22 Apr '24

> On Apr 20, 2024, at 7:36 PM, Friedman, Simon <friedmans(a)umkc.edu> wrote: > > I am working on mol graphics for a figure. I'm using both chimera-x and chimera. I'm trying to figure out if chimera-x has a set of functionality that chimera has. Specifically in chimera I was able to move light sources around, change intensity, shinyness etc. Also I was able to use ray tracing in the output. In chimera-x I can't find any menu for moving light sources around etc. One very cool thing that is there is the 'soft' lighting option which gives a very cool surface to the carbon atoms. So I was wondering if there were more options for messing with lighting etc in chimera-x? > Thank you! > > Cheers, > Simon > > Simon H. Friedman, Ph.D. > UM Curators' Distinguished Professor > Division of Pharmacology & Pharmaceutical Sciences > University of Missouri, Kansas City Hey Simon! ChimeraX does not have ray-tracing, but as you discovered with the ChimeraX "soft" lighting (sugar cube icon in the toolbar), it does have ambient-occlusion lighting simulated by multiple multidirectional light sources, which Chimera does not have. The rest of this description pertains to ChimeraX: When you try the different lighting icons in the toolbar, the corresponding command is shown in the Log. So that should help you learn some of the common options. However, there are lots more options available with the commands than are represented by toolbar icons. (1) the "lighting" command has the presets including soft, but also options for intensities, colors and directions of the directional lights (key light and fill light), depth cueing, and shadows, among many other things. There is no GUI for changing the direction interactively, however. See the "lighting" manpage and many options explained therein. It also shows pictures of the relevant icons from the toolbar. <https://rbvi.ucsf.edu/chimerax/docs/user/commands/lighting.html> (2) the "graphics" command has options for background color, silhouette edges (the outlines that are usually black), and triangulation fineness of atom/bond/ribbon representations, see: <https://rbvi.ucsf.edu/chimerax/docs/user/commands/graphics.html> (3) the "material" command has control over shininess of objects <https://rbvi.ucsf.edu/chimerax/docs/user/commands/material.html> I hope this helps, Elaine ----- Elaine C. Meng, Ph.D. UCSF Chimera(X) team Resource for Biocomputing, Visualization, and Informatics Department of Pharmaceutical Chemistry University of California, San Francisco

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