October 2022 - ChimeraX-users - RBVI Mailing Lists

usage for multimer
by Dennis Poh 05 Oct '22

05 Oct '22

Hi I encounter a problem in multimer prediction with the sequences I use as input. It's always indicating: "Missing or invalid "sequences" argument: Sequences argument" and " is not a chain specifier, alignment id, UniProt id, or sequence characters" The input format is always something like a fasta format: >seq_id ACCCC >seq_id2 ALLPAAAA May I know how I can rectify this? Thanks! - Dennis

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Using ChimeraX to predict protein-protein interaction/binding via Alphafold.
by Tan, Wei Ren 05 Oct '22

05 Oct '22

Dear Sir/Mdm, Sorry to disturb you with regards to this matter, as I am unable to find any resources online, or on your YouTube channel to solve my problem. I am William, a medical student at King's College London, UK, who have been using your software, ChimeraX, for the past few months to elucidate possible protein structure for one of the protein I am currently studying. I have faced a problem with predicting a protein interaction between a heterodimer (6z1n) and a novel protein that I am studying now. When I loaded both pdbs, I am unable to run the alphafold via the command: alphafold predict #1&#2 (where #1 is 6z1n and #2 is my protein of interest) Hence, how can I load the pdb of 6z1n (the heterodimer) and the sequence of the protein of interest to predict what is the possible interaction between the 2, instead of putting all 3 monomers as a sequence and for Alphafold to repredict the interactions between the2 monomers within 6z1n instead? Thank you very much and sorry to disturb you! Sincerely Yours, William Tan

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ligand not showing up
by Dr. Eddie 05 Oct '22

05 Oct '22

Hi all, I've got a pdb and I can't seem to get ChimeraX to recognize the ligand (resname STR) at the end of the pdb. I've modified the ATOM to be HETATM but it still does not show up. I hide solvent and the lipids and I know where it should be (from seeing it in vmd) but only a void is there. Any ideas what is wrong with the pdb? Thanks, Eddie

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alphafold contacts output file
by McClean, Phillip 04 Oct '22

04 Oct '22

Hi Everyone- I used the following command to obtain a file with the contacts between two chains: alphafold contacts /B to /C output contact_pae.txt I cannot seem to find where the output file is located. Thanks for any help. Phil McClean

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ChimeraX for multimeric prediction
by Dozic,Abdul-Vehab 03 Oct '22

03 Oct '22

Greetings, Firstly, I wanted to say that ChimeraX is excellent software, and it can definitely be helpful to enhance our research experience. I wanted to ask about using ChimeraX to predict whether a protein occurs in a multimeric form. I ran Alphafold for multimeric simulations and I have analyzed the predicted aligned error qualitatively, but I was wondering if ChimeraX had some built-in package for fast error analysis such as that it can tell us automatically whether it is likely to find a protein in a particular multimeric state that was modeled by Alphafold. Thanks, Best, Abdul-Vehab

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