modeller_usage

modeller_usage@salilab.org

3151 discussions

remodelling a fragment of protein using different template.
by Yogesh Sharma 16 Feb '21

16 Feb '21

greetings readers, I am trying to model a protein with low homology. I have used ab initio methods to get a starting structure. but i want to remodel first 50-100 residues according to a different PDB template. is it possible to do so using modeller? please give some suggestions *Yogesh Sharma*

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Installation Bug issue modeller 10.0
by Henry Monteiro 07 Feb '21

07 Feb '21

Greetings, I got the keys recently but I stumbled on a problem trying to run the program. When I type and run the command "mod10.0 foo.py" (ubuntu 20.04) this come in response: "Could not find platform independent libraries <prefix> Could not find platform dependent libraries <exec_prefix> Consider setting $PYTHONHOME to <prefix>[:<exec_prefix>] 'import site' failed; use -v for traceback FATAL ERROR: Cannot open file foo.py: No such file or directory" Could you guys have any clue how to repair this problem? Sincerely, Henry Magalhães

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Modeller 10.0 release
by Modeller Caretaker 02 Feb '21

02 Feb '21

A new version of Modeller, 10.0, is now available for download! Please see the download page at https://salilab.org/modeller/ for more information. If you have a license key for Modeller 8 or 9, there is no need to reregister for Modeller 10.0 - the same license key will work. (It won't do any harm to reregister if you want to, though!) 10.0 is a major update that adds support for residue numbers >= 10000 in PDB format files using hybrid-36 notation, assigns the chain ID 'A' to single-chain models to generate more standard PDB files, and uses CamelCase naming for all Python classes. See the Modeller manual for a full change log: https://salilab.org/modeller/10.0/manual/node40.html If you encounter bugs in Modeller 10.0, please see https://salilab.org/modeller/10.0/manual/node10.html for information on how to report them. Note: you are receiving this email either because you subscribed to the modeller_usage mailing list, or you provided this address when you requested a Modeller license and you ticked the "notify me of new releases" box. In the latter case, if you no longer wish to receive announcements of new Modeller releases, simply unsubscribe from the modeller_announce mailing list, or reply to this email and let us know. Ben Webb, Modeller Caretaker -- modeller-care(a)salilab.org https://salilab.org/modeller/ Modeller mail list: https://salilab.org/mailman/listinfo/modeller_usage

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Fibrillar collagen structure model 3hr2 Inbox
by Amadeus Cavalcanti Salvador de Alcântara 27 Jan '21

27 Jan '21

Dear Modeller Users, I am trying to use Modeller to model a comparative protein structure for the type I collagen. I came to this trying to reproduce a model from this paper: doi 10.1021/nl103943u ( *Nano Lett.* 2011, 11, 2, 757–766 ) It also used Modeller to create such a model. I contacted the 1st author for instructions on how he created the model, but unfortunately he said not to remember anymore (it has been 10 years since). I also want to mention that before posting this, I read the Modeller manual and several questions and answers posted in the mail listing. They helped me get to this point. In the following I will describe in some details what I have done, with what files and how: All necessary files for reproduction are attached in this email (I tried to attach all files - pdb, target fasta, outputs, etc. - , but it exceeded the limit of 100 KB). *1 - Target:* P02452 (CO1A1_HUMAN) and P08123 (CO1A2_HUMAN) from https://www.uniprot.org/uniprot/P02452 and https://www.uniprot.org/ uniprot/P08123 The Targets are in the Fasta format. I converted them to .ali files in the PIR format, as suggested by Ben Webb in https://salilab.org/archives/modeller_usage/2010/msg00072.html . (see FASTAtoPIR.py in the attached files). I manually edited the protein code and field2 of the .ali files (based on what I read in the manual - *File formats B.1 Alignment file (PIR)*) That is how it looks like now: * COL1A1.ali* ___________________________________________________________________ >P1;COL1A1 sequence:COL1A1: : : : :::-1.00:-1.00 MFSFVDLRLLLLLAATALLTHGQEEGQVEGQDEDIPPITCVQNGLRYHDRDVWKPEPCRICVCDNGKVLCDDVIC ...* ___________________________________________________________________ *2 - Template:* 3hr2.pdb from https://www.rcsb.org/structure/3HR2 It is very important to me to get a model as close to this structure as possible, since it comprises the collagen fibrillar structure. *3 - Alignment: *I decided to align each chain and sequence individually, as many answers in the mail listing suggested. First of all I tried to align the COL1A1.ali with the chain A of the 3hr2. pdb structure. I aligned the sequences using salign (align2d was taking too long). The 3hr2.pdb contains 2 non standard amino acids: HYP hydroxyproline LYZ Hydroxylysine I added - env.io.hetatm = True - in order to read them. *1A_salign.py* ___________________________________________________________________ env = environ() aln = alignment(env) env.io.hetatm = True mdl = model(env, file='3hr2', model_segment=('FIRST:A','LAST:A')) aln.append_model(mdl, align_codes='3hr2A', atom_files='3hr2.pdb') aln.append(file='COL1A1.ali', align_codes='COL1A1') aln.salign() aln.write(file='COL1A1-3hr2A.ali', alignment_format='PIR') aln.write(file='COL1A1-3hr2A.pap', alignment_format='PAP') ___________________________________________________________________ I added to restyp.lib: HETATM | HYP | O | | HYP | hydroxyproline HETATM | LYZ | K | | LYS | lysine, +1 I have HYP topology and parameters, but since I don't have them for LYZ I chose to treat LYZ as LYS (Lysine). I do not know if I can do it. Is it better to do so or to simply let Modeller continue with the following warning? *read_pd_459W> Residue type LYZ not recognized. 'automodel' model building will treat this residue as a rigid body.* *4 - Automodel: *I created 10 models and chose the one with lowest DOPE score (all scored 1.0 in the GA341 score), in my case, COL1A1.B99990010.pdb. I included HYP topology and parameters information to the *top_heav*.lib and *par*.lib files from the Modeller Library. Furthermore I added the HB1 (new type in HYP top) atom type information to *solv*.lib, *radii*.lib and *radii14*.lib. The HYP information was taken from *top_all36_prot_modify_res*.str and *par_all36_prot_modify_res*.str in the CHARMm FF. *2A_model-single.py* ___________________________________________________________________ from modeller.automodel import * env = environ() env.io.hetatm = True env.libs.topology.read('${LIB}/top_heav.lib') env.libs.parameters.read('$(LIB)/par.lib') # from manual a = automodel(env, alnfile='COL1A1-3hr2A.ali', knowns='3hr2A', sequence='COL1A1', assess_methods=(assess.DOPE, assess.GA341)) a.starting_model = 1 a.ending_model = 10 a.make() ___________________________________________________________________ *5 - Final model: *I also ran the 3A_evaluate_model and 4A_plot_profiles python scripts and after that opened the 3hr2 A chain and the final model in VMD. The model looks good, however, it is not as close to the 3hr2 structured as I wished. As a mechanical engineer I am no used to those models nor to homology modeling and have been learning all here by reading the manual, instructions and mail listing. Did I make many/any mistakes? Where and what? Can the model become better (more close to the 3hr2 template structure)? If yes, how? How to know if a model is "good enough"? Can I proceed like that and create the models for the chains B and C and complete the collagen structure? I am afraid to lose the fibrillar collagen structure (which in this case is similar to a crystalline periodic structure) from 3hr2.pdb if the model is not very similar to the the 3hr2 structure. Thank you in advance for reading up to here. I am looking forward to reading your observations, suggestions and corrections. They are all very welcome. Amadeus

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Query regarding the modelling of a particular set of residues in a protein
by Sruthi Sudhakar 20 Jan '21

20 Jan '21

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Objective function scores
by Tiglath Moradkhan 12 Jan '21

12 Jan '21

Hi I have a question about objective function scores. Why is it that lower objective function scores are indicative of better models. I've searched online for how objective function scores are computed but the explanation is too technical and I would be very grateful if you could provide a much simpler explanation of the objective function score. Thanks Tiglath

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Import site failed
by Li,Haoxi 06 Jan '21

06 Jan '21

Dear Modeller Users, Hope you had a great holiday! I was implementing mod9.25 on Linux system (Ubuntu 16.04.6), but encountered this output: Could not find platform independent libraries <prefix> Could not find platform dependent libraries <exec_prefix> Consider setting $PYTHONHOME to <prefix>[:<exec_prefix>] 'import site' failed; use -v for traceback The jobs were still completed. Would this error matter? If so, how can I fix it? Thank you in advance! Best wishes, Haoxi

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Getting a ligand to work in homology models
by Casey Becker 04 Jan '21

04 Jan '21

Hello, I'm currently trying to model a hemoglobin monomer that has a heme group as a ligand. If I run Modeller through the chimera interface, the ligand carries over to the models. However, if I run through IDLE, which I prefer to do because I'm using parallel jobs, the ligand does not carry over. Any help appreciated.

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Structural alignment of multiple chains
by Tal Weizmann 21 Dec '20

21 Dec '20

Hello, I would like to run structural alignment using all chains of the same protein with salign (different PDB files). Can I do that with modeller? Thanks, Tal No.1 Modern University in the Midlands Guardian University Guide 2021 1st for Overseas Student Experiences based on student trips abroad from HESA 2018/19 UK data Top 30 in the World for International Students QS World University Rankings 2021 University of the Year for Student Experience 2019 The Times and Sunday Times Good University Guide 2019 NOTICE This message and any files transmitted with it is intended for the addressee only and may contain information that is confidential or privileged. Unauthorised use is strictly prohibited. If you are not the addressee, you should not read, copy, disclose or otherwise use this message, except for the purpose of delivery to the addressee. Any views or opinions expressed within this e-mail are those of the author and do not necessarily represent those of Coventry University.

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modeling two chains while preserving their structural orientation wrt each other
by shivu shiv 04 Dec '20

04 Dec '20

Dear All, I am working on modeling a protein with two chains (heterodimer). I have used two separate pdb files for each chain and oriented the two template structures appropriately before the modeling. Modeller is able to model both the chains, however not preserving the orientation of both the chains. I am seeking suggestions for how to specify restraints to preserve the orientation of both the chains with respect to each other. Please provide your suggestions. Thanks and Regards shivu

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