- ChimeraX-users - RBVI Mailing Lists

Adding H atoms
by Daniel VillanuevaAvalos 25 Jul '22

25 Jul '22

Hello, I am adding hydrogen atoms by entering addh#1 to the command line, and it works but when I export the pdb and import it into houdini, things are messed up. Sometimes it just doesn't show up and other times, just part of the structure shows up. Am I missing something? Thank you, Daniel.

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Re: [chimerax-users] Colab Modelled, but no PDB
by Tom Goddard 25 Jul '22

25 Jul '22

Hi Anthony, Predicting a dimer where the monomer is 1182 residues, so a total of 2364 residues is guaranteed to run out of memory on Colab or Colab Pro -- the GPUs they offer don't have enough memory (at most 16 GB). The web page on AlphaFold performance test cases shows that only an Nvidia A40 with 48 Gbytes of memory handles over 2100 residues. That web page gives results for running AlphaFold via ChimeraX on Colab, but also running AlphaFold installed on our machines at UCSF with either an A40 GPU or an RTX 3090 GPU (24 GB memory). The "no templates" means structure templates were not used when running on our UCSF machines. Tom > On Jul 24, 2022, at 1:35 AM, Anthony Morgan <anthony.morgan(a)pharm.ox.ac.uk> wrote: > > Dear Tom, > > Thanks so very much, this is low-hanging fruit for you, but invaluable for me as I am a newbie. Really appreciate it. The Test link is really illuminating too thank you. > > I had wanted to try a dimer of 1182 residues each, but I am doubting that this is going to work, even with the paid service. Agreed? > On the test page, one of the runs is annotated as “no templates”. I cannot see how you can add templates to the Alphafold panel. I only see Energy Minimization under Options. Am I missing something? > > I’ve now got the pdb of the one model, thank you. It’s obvious once it’s pointed out, but I couldn’t see the wood for the trees. > > Really appreciate your time. > > Kind regards, > > Anthony > > >> On 24 Jul 2022, at 00:37, Tom Goddard <goddard(a)sonic.net <mailto:goddard@sonic.net>> wrote: >> >> Hi Anthony, >> >> AlphaFold predictions on Google Colab of 1200 amino acids often fail as you can see from test cases on this web page >> >> https://www.rbvi.ucsf.edu/chimerax/data/alphafold-jan2022/afspeed.html <https://www.rbvi.ucsf.edu/chimerax/data/alphafold-jan2022/afspeed.html> >> >> With free Google Colab you often get a very old Nvidia K80 GPU with 12 Gbytes of memory. With Colab Pro ($10/month) I usually get an Nvidia P100 GPU with 16 Gbytes of memory which can handle slightly bigger proteins. You can check what GPU you got by pressing the "+ Code" button on the Google Colab window, then entering the command "!nvidia-smi" and pressing the play button, which gives output like this >> >> Sat Jul >> 23 23:28:55 2022 +-----------------------------------------------------------------------------+ | NVIDIA-SMI 460.32.03 Driver Version: 460.32.03 CUDA Version: 11.2 | |-------------------------------+----------------------+----------------------+ | GPU Name >> Persistence-M| Bus-Id Disp.A | Volatile Uncorr. ECC | | Fan Temp Perf Pwr:Usage/Cap| Memory-Usage | GPU-Util Compute M. | | | | MIG M. | |===============================+======================+======================| | 0 Tesla P100-PCIE... Off | 00000000:00:04.0 >> Off | 0 | | N/A 38C P0 34W / 250W | 16259MiB / 16280MiB | 0% Default | | | | N/A | +-------------------------------+----------------------+----------------------+ >> >> >> To download a completed model after an AlphaFold error (typically out of memory), click on Files in the Google Colab window, then click on the predicted structure, "af1182_unrelaxed_model_1.pdb" in your image, and click the "..." to the right of the file and choose Download from the menu that appears. The file will then appear on your local computer in >> >> ~/Downloads/ChimeraX/AlphaFold/prediction_1 >> >> I'll see if I can add to the ChimeraX ColabFold output the GPU and also make it automatically download partial results in case an error occurs. >> >> Tom >> >> >>> On Jul 23, 2022, at 4:41 AM, Anthony Morgan via ChimeraX-users <chimerax-users(a)cgl.ucsf.edu <mailto:chimerax-users@cgl.ucsf.edu>> wrote: >>> >>> Dear All, >>> >>> I’m new to Chimera X and to Colab Alphafold (AF), hope you can help please. >>> >>> I’m running Chimera X 1.4 on a Macbook Air. >>> I want the predicted structure of a fairly large protein (1182 residues). >>> When I first ran Colabfold_predict, it terminated after 90 min (RAM issue). >>> I re-ran the same sequence *without * Energy Minimization. >>> After 20 mins, it successfully returned the first model (see attached), but ran into RAM issues again. >>> >>> Two questions: >>> >>> There is no ‘Prediction’ folder in my Downloads, so how can I download the *.pdb file of model #1 that it clearly has generated? >>> If I cannot do this, will an upgrade to Colab Pro solve this issue for this size of protein? >>> >>> Thanks for advice. >>> >>> Kind regards, >>> >>> Anthony >>> >>> <Screen Shot 2022-07-23 at 12.17.14.png> >>> >>> >>> >>> >>> _______________________________________________ >>> ChimeraX-users mailing list >>> ChimeraX-users(a)cgl.ucsf.edu <mailto:ChimeraX-users@cgl.ucsf.edu> >>> Manage subscription: >>> https://www.rbvi.ucsf.edu/mailman/listinfo/chimerax-users >> >

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Movie recording
by Dmitry Semchonok 25 Jul '22

25 Jul '22

Dear colleagues, I have several maps and models that I would like to spin around independently at once and record as a movie. How to do that? Thank you in advance. Kind regards, Dmitry

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Question about commands similar to openModel in Chimera
by Thu Nguyen 25 Jul '22

25 Jul '22

Good morning, I am editing a python script that previously used the command chimera.openModels.list(modelTypes=[chimera.Molecule])to return a list of open molecules. Do we have a similar command in ChimeraX or is there any other way to get a list of protein chains in ChimeraX? Thank you very much. Best regards, Thu

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Colab Modelled, but no PDB
by Anthony Morgan 23 Jul '22

23 Jul '22

Dear All, I’m new to Chimera X and to Colab Alphafold (AF), hope you can help please. * I’m running Chimera X 1.4 on a Macbook Air. * I want the predicted structure of a fairly large protein (1182 residues). * When I first ran Colabfold_predict, it terminated after 90 min (RAM issue). * I re-ran the same sequence *without * Energy Minimization. * After 20 mins, it successfully returned the first model (see attached), but ran into RAM issues again. Two questions: * There is no ‘Prediction’ folder in my Downloads, so how can I download the *.pdb file of model #1 that it clearly has generated? * If I cannot do this, will an upgrade to Colab Pro solve this issue for this size of protein? Thanks for advice. Kind regards, Anthony [cid:8B6C8DAE-A4C3-4F95-8B26-037B6B318679]

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Chimera X Runs But does Not Install
by Anthony Morgan 23 Jul '22

23 Jul '22

Dear All, I’m new to Chimera X, so I am probably doing something wrong. Hope you can help please. I have ‘installed' either v1.3 and, more recently, 1.4 on my Macbook Air (under OSX 10.15.5; 1.1GHz processor, Intel Iris Plus Graphics 1536 MB). * Whilst I can run Chimera X fine (the first time after ‘installing'), it doesn’t appear to be installed locally on my laptop (that I can find). * If I close the App and try and reopen in, it’s not local, and I have to run the Install .dmg every time I want to ‘run’ it, which takes an age. * Under Security > Privacy, Chimera has Full Disk Access. Is this normal behaviour? Thanks for any advice. Regards, Anthony

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Model panel for multi-state objects of dimeric protein
by Enrico Martinez 22 Jul '22

22 Jul '22

Dear ChimeraX users! I am working on the visualization of protein-ligand interactions obtained from docking. In the ChimeraX session I have a loaded session with 88 docking poses (consisting of each frame receptor and ligand) corresponded to the separate objects (1.1 .. to 1.88) >From this ensemble I need to keep only the X object from these multiple states. I have tried to use the following command: close #1 & ~ #1.x which works perfectly for the monomeric protein. But when I am dealing with the analysis of the dimer (with A and B chains) it does not work. Only close #1 still can be used to close ALL objects. Which command could be used to keep the selected state from the ensemble for both monomer and dimer in the same way? Many thanks in advance Cheers Enrico

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Match/Matchmaker multiple segments of two protein sequences
by Gong, Zhen 21 Jul '22

21 Jul '22

Dear Chimerax developers and users, I am wondering if chimerax is able to do match/matchmaker multiple segments of two protein sequences, something like: match #1:3-13, 23-70, 72-81, 86-101 to #2:7-17, 18-66, 67-76, 77-92 cutoffDistance 3 showAlignment true Maybe it can but I did not put the command in correct format. Please help. A related question would be that the default alignment algorithm in chimerax (Needleman-Wunsch or Smith-Waterman) did not do a good job when the two proteins share high structural similarities with low sequence identity. I would like to do the manual sequence alignment, save the alignment as .aln file and use that for matchmaker, iterate with cutoff and get final rmsd of aligned atoms. Is it possible to execute such procedures in chimerax? Many thanks in advance for any helpful suggestion and discussion! Best regards, Zhen

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Difficulties running ChimeraX
by Douglas Marr 21 Jul '22

21 Jul '22

Hey everyone, I've recently updated my laboratory's computer to run linux and ubuntu 22.04. Afterwards, I installed chimeraX for that distribution of ubuntu, but whenever I try to run it, the chimeraX will open, but will be completely frozen. Nothing can be clicked on, nor can the protein structure be rotated. After a few seconds, the computer reports that ChimeraX has stopped and gives me the choice to either wait or force quit. I've tried waiting a very long time, but it always remains frozen, so I think there must be something wrong with my install. Do you guys have any advice on how to fix it? Best, Douglas Marr

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Combining 2 cryo-em maps in one
by Dmitry Semchonok 20 Jul '22

20 Jul '22

Dear colleagues, What are the ways to combine 2(or more) 3D Cryo-em maps in one? Thank you Sincerely, Dmitry

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