- Chimera-users - RBVI Mailing Lists

Re: [Chimera-users] How to install package in chimera python?
by hy liao 19 Apr '17

19 Apr '17

Hi, this was posted here, but where exactly do I invoke the said chimera command? I open chimera with IDLE; a python shell opens with the following Python 2.7.10 (default, May 4 2016, 01:09:35) [GCC 4.6.2] on linux2Type "copyright", "credits" or "license()" for more information.==== No Subprocess ====>>> >>> import chimera>>> I tried what the posting said, but got an error>>> chimera --nogui --script get-pip.pyTraceback (most recent call last): File "<pyshell#3>", line 1, in <module> chimera --nogui --script get-pip.pyNameError: name 'nogui' is not defined Thanks,SL [Chimera-users] How to install package in chimera python? | | | [Chimera-users] How to install package in chimera python? | | |

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SAS exposure question
by Kyle Novakowski 17 Apr '17

17 Apr '17

Hi there, I'm hoping to get some clarification on how to calculate the SAS of a defined set of residues within a molecular structure. I currently have 3 molecular structures in a chimera file and was hoping to compare the SAS of a specific region within 2 mutant proteins relative to that same region of the wildtype protein. Thanks. Kyle -- *Kyle Novakowski, B.Sc.* *Ph.D. Candidate: Medical Science (Infection & Immunity) and Laboratory Manager* *Faculty of Health ScienceDepartment of Pathology and Molecular MedicineMcMaster UniversityE: novakoke(a)mcmaster.ca <novakoke(a)mcmaster.ca>P: 905-525-9140 ext. 21551 <905-525-9140%20ext.%2021551> (work/laboratory)*

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How to show local agreement between cryo-EM map and model
by #AHMED TOFAYEL# 17 Apr '17

17 Apr '17

Dear developers and users, Is it possible to generate/color a cryo-EM map to show local agreement between the map and the model generated using the same map? If I am not wrong, the following figure had accomplished the job but I don't understand how to generate a similar figure for my project: http://d2ni3bh4dzb2ig.cloudfront.net/content/embojnl/28/6/755/DC7/embed/inl… Best regards, Tofayel NTU Singapore

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How DMIN, DMAX, DMEAN is re-calculated if particular portion of MRC is chopped in Chimera
by SALIM SAZZED 13 Apr '17

13 Apr '17

Hello, I am a Ph.D. student of Computer Science department at Old Dominion University, USA. I am using Chimera for my research. Can you please tell me how Chimera calculates *DMIN, DMAX, DMEAN *value of MRC header after chopping a portion of original MRC/MAP*?* My understanding about that- *DMIN: T*he minimum density value of the voxels in the MRC/MAP Cube. *DMAX: T*he maximum density value of the voxels in the MRC/MAP Cube. *DMEAN: *The average density of voxels (add all the voxels density value and divide it by the number of voxels). It will be really helpful if you clarify. Thanks Salim Sazzed

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Gold atoms
by Dominique Matt 13 Apr '17

13 Apr '17

Dear Colleagues, I am an enthusiastic Chimera user. I recently got some structures of gold complexes and noticed that the when using the ball&stick or the sphere representation, gold atoms are too small, while palladium atoms are absolutely OK. What can I do to increase the size of the gold atoms ? Or could you correct this directly in the online program ? I thank you for your help Sincerely, Dominique MATT CNRS Research Director Laboratoire de Chimie Inorganique Moléculaire et Catalyse Institut de Chimie de Strasbourg UMR 7177 CNRS-Université de Strasbourg 4 rue Blaise Pascal, 67070 Strasbourg cedex, France Phone : + 33 3 68 85 17 19 E-mail : dmatt(a)unistra.fr web: http://lcimc.u-strasbg.fr

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saving the session
by Dmitry Semchonok 13 Apr '17

13 Apr '17

Dear colleagues, How to save the session and in the same time all pdb + volume maps in it (all at once)? Thank you Sincerely, Dmitry

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Re: [Chimera-users] Displaying side chains
by Mark J. van Raaij 13 Apr '17

13 Apr '17

As I understand it, Chimera by default displays those side-chains that are near ligands, and assumes that any non-water, non-protein molecule is a ligand. Mark J van RaaijCNB-CSICwwwuser.csic.es/~mjvanraaij -------- Original message --------From: Manish Manish <manishjnu8(a)gmail.com> Date: 13/04/2017 08:55 (GMT+01:00) To: Chimera-users(a)cgl.ucsf.edu Subject: [Chimera-users] Displaying side chains I have opened PDB ID 1iep using "fetch structure by ID from PDB" through chimera GUI menu. I can see the side chain of few residues such as PHE 317.A and Valine 299.A are automatically displayed. Also by moving the mouse cursor, one can find the distance between different atom types such as between CA and CB. Whereas side chain of many residues such as Lysine 274.A and ASP.276 have not been displayed. My question is how the chimera decides this differential display? Whether chimera directly uses information from PDB files to differentially display the side chains and distance. Or chimera has its own algorithms to decide this. It will be a great help for me if one can point me toward the portions of PDB file or source code from Chimera which does this. I have also attached the image file. Sincerely Manish

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Displaying side chains
by Manish Manish 12 Apr '17

12 Apr '17

I have opened PDB ID 1iep using "fetch structure by ID from PDB" through chimera GUI menu. I can see the side chain of few residues such as PHE 317.A and Valine 299.A are automatically displayed. Also by moving the mouse cursor, one can find the distance between different atom types such as between CA and CB. Whereas side chain of many residues such as Lysine 274.A and ASP.276 have not been displayed. My question is how the chimera decides this differential display? Whether chimera directly uses information from PDB files to differentially display the side chains and distance. Or chimera has its own algorithms to decide this. It will be a great help for me if one can point me toward the portions of PDB file or source code from Chimera which does this. I have also attached the image file. Sincerely Manish

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How to open four volumes simultaneously in Chimera
by Barnali Waugh 12 Apr '17

12 Apr '17

Hi All, I am using Chimera volume viewer to open four volume simultaneously (*.mrc tomogram; 256 256 256 voxel). However, I can open any three volumes at a time. When I try to open the fourth one, it replaces one of the open volumes. I would be thankful for any suggestion. Regards, Barnali.

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given viewing angle
by hy liao 11 Apr '17

11 Apr '17

Hi, How can I specify the elevation and the azimuth angles to view my density map on chimera? In Matplotlib, one can specify the elevation and azimuth, so I was hoping chimera can do something similar that is based on INPUT ANGLES and not having to get involved with tedious transformation matrices and such. Thanks,SL

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Radius of Gyration questions
by George Tzotzos 10 Apr '17

10 Apr '17

Taking a reference PDBID 3n7h, I’ve generated for an MD simulation topology and restart files. I’ve loaded on Chimera 3n7h and then the starting frame of the MD simulation. Used the MatchMaker and found perfect superposition of the protein backbone and two ligands (3n7h is #0 and the ligands #0:129.A and #0.132.B I run the radius of gyration script (see attached). I found that the radii of gyration for the ligands in the two models are completely different. #0 center of mass: 12.6543 10.4356 15.4086, radius of gyration: 21.182 #1 center of mass: 42.7381 42.5171 42.6163, radius of gyration: 37.390 I don’t follow why this is so. Any explanation would be most welcome. A second question regards the units of the radii of gyration. Are they Angstrom or nm? Thank you in advance George

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mysteries
by Arthur Szabo 10 Apr '17

10 Apr '17

After several different occurrences at different times of the same thing I finally decided to ask 1) What happened ?2) How can I reverse it? Now the hard part is to try to described what happened. I was working on a figure - it does not seem to depend on its complexity. I had a figure on the screen, ribbons colored, selected amino acids visualized. I did something with the mouse I believe, though it might have been that my finger touched something on the keypad - what happened was that the majority of the structure disappeared. Parts of it were there. I could rotate it and different parts of the structure would come into view and what had just been visible faded away. It was like on rotation portions of the structure would be moving in the plane of the view, but could move out of that plane I was also able to enlarge whatever portion of the image was on the screen. I know that this is difficult to answer because one really has to see the result of whatever I clicked or something else. It is not just a random event. Thanks for any tips. Arthur G Szabo

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question about Chimera
by Richard Collins 10 Apr '17

10 Apr '17

Hello I would like to highlight certain residues of interest in my molecule, preferably by colorizing them in Chimera. Is there a way to do this? Richard Collins Lab Research Project Coordinator Department of Cell Biology Peter Gilgan Centre for Research and Learning Room 199420, bench HH Hospital for Sick Children 686 Bay St. Toronto, ON CANADA M5G 0A4 T (ext): 416 813-8474 T (int): 308474 E: rcollins(a)sickkids.ca ________________________________ This e-mail may contain confidential, personal and/or health information(information which may be subject to legal restrictions on use, retention and/or disclosure) for the sole use of the intended recipient. Any review or distribution by anyone other than the person for whom it was originally intended is strictly prohibited. If you have received this e-mail in error, please contact the sender and delete all copies.

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FINDING SALT BRIDGE
by Qistina Hassan 08 Apr '17

08 Apr '17

Hi, 1. How to find salt bridges of 50 selected residues in a protein using Chimera? 2. How to measure distances of one residue to another residues to determine if the residues could form salt bridge or not? Thank you, Qistina

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Non-ASCII error
by ARMIN HODAEI 06 Apr '17

06 Apr '17

Dear Chimera users, My PDBhas some extra HOH water molecules in it. when I delete them manually from the pdb I could not open the PDB with Chimera, it gives the error Non-ASCII file. What can I do to fix it? Or is there any way to delete extra HOH atoms from the PDBfile inside the Chimera software? Cheers, -- Armin Hodaei Department of Physics, Faculty of Arts and Sciences Koc University, Istanbul

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building modeller loops refinement
by ARMIN HODAEI 06 Apr '17

06 Apr '17

Dear Chimera Users, I want to use refining loop option to build missing residues for my target protein. First I get the FASTA file structure of protein then I load it into Chimera, after that in the Structure tab I select load structure, then I see the protein. After that Again in the "Structure" tab I select Modeller(loops/refinement). The rest is easy for creating the new structure PDB. But the problem is that I want whole protein to be treated in this refinement, but it only chose one chain, How can I do this for both chains at once? Sincrely, -- Armin Hodaei Department of Physics, Faculty of Arts and Sciences Koc University, Istanbul

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(no subject)
by Kavya Shankar 05 Apr '17

05 Apr '17

Hi, I would like to know how the axis of symmetry is calculated in a dimer as in the precise algorithm that is used to do this. Thank you. Regards, Kavya Shankar

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Defining glycosidic bond of nucleotide objects
by Charles-Alexandre Mattelaer 04 Apr '17

04 Apr '17

Dear Chimera-users I'm currently doing modeling on hexitol nucleic acids and using Chimera to visualize the trajectories. Since the atoms in the hexitol-ring are numbered differently than in the standard ribose, Chimera has some difficulties displaying the correct ribbon (backbone) and slab (bases). I've been able to define my own ribbon style using the Ribbon Style Editor and creating a new ribbon style based on the standard 'nuleic acid' trace and replacing the existing backbone atoms with the corresponding atom names for the non-standard hexitol residues. The main problem is setting a slab object to replace the base atoms. The 'nucleotide objects' settings are based on a glycosidic bond on the C1' of ribose. In HNA the glycosidic bonds are found on C2' of hexitol. I believe this is causing the problem. Additionally, I can add that using the 'ladder'-like objects, a gap between the 'steps' and the backbone occurs. (I've tried setting the base as anchor but to no avail.) I was wondering if there would be a way to redefine the anchor atom of the nucleotide objects? (I searched in the manual but haven't found any ways to redefine the anchor itself.) This would greatly improve visibility of larger oligonucleotides and would help me a lot. Kind regards and thank you in advance Charles-Alexandre Mattelaer

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attributes
by John Mercer, Ph.D. 04 Apr '17

04 Apr '17

Hi, If you have a structure file so large that it needs loaded as two separate files, e. g. a ribosome, is it still the case that a designer attribute file for individual subunits across the whole structure would still be handled by the usual single file attribute mechanism or is something else necessary? Does ChimeraX have an attribute mechanism that is the same as Chimera? Best, -John Mercer Duke University

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another question
by Arthur Szabo 04 Apr '17

04 Apr '17

In the menu used to save images there are two boxes, one for the image width and the other for the image height In the part of the menu below I have set the pixel units for the image width to 5000, with the height being automatically set. These are not the default settings. How can I make them the default settings? In the version of Chimera that I recently downloaded the default settings were 1600 and 796, respectively. The default settings of the former chimera download (my computer had been corrupted so downloaded Chimera again). I can't find anywhere in this image saving menu to change the default settings. Thank you Arthur G. Szabo [cid:image001.png@01D2AD56.F614B2B0]

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[summovie]
by Edoardo D'Imprima 04 Apr '17

04 Apr '17

Hi Oli, one quick question: I noticed the interesting question you posted on the Unblur forum regarding the use of summovie. Did actually worked out the “corrected” version by Tim that should allow you to perform dose weighting and saving the aligned movies? Cheers, Edoardo --------------------------------------------------- Edoardo D'Imprima PhD Student Max Planck Institute of Biophysics Structural Biology Department Max-von-Laue Straße 3 60438 Frankfurt am Main Germany Tel: +49 (0) 69 6303 3015

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(no subject)
by Kavya Shankar 03 Apr '17

03 Apr '17

Hi, I learnt that a dimer axis of symmetry is got by using matchmaker and then the rotation is measured from it. I would like to know the algorithm that is used to calculate the axis of symmetry and how exactly it is done if possible. Thank you. Regards, Kavya Shankar

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active questions
by Arthur Szabo 03 Apr '17

03 Apr '17

I am working with a structure that is largely a protein, and there is a short oligonucleotide associated with it. In the tools menu the sequence of the protein is Chain A and the short oligonucleotide is Chain C. I have shown their respective sequences. I also know how to highlight components of each chain etc. However, there is a short dinucleotide with two thymine residues that are also part of the structure. I was able to select these residues and the two thymine residues in the oligonucleotide by using the SELECT menu: residues: dT. So in total four thymine residues are selected and with the ACTIONS menu I can visualize them. Going to Chain C I can hide the two thymine residues on the longer oligo. How can I select the other two thymine residues that make up the short dinucleotide? One of these thymines is covalently bound to a tyrosine residue through a phosphodiester bond. I can visualize the tyrosine monophosphate through Chain A, and one can see it connected to the relevant thymine residue. But I would like to color the two thymine residues. But I cannot select them or at least I do not know how to select them. I am not an expert at using the command line. Likely there is something there. Again your assistance is sincerely appreciated. Arthur G. Szabo

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Stereo
by Arthur Szabo 03 Apr '17

03 Apr '17

Is it possible to create a stereo view image from a single pdf image. I have colored different segments of the original pdf image. Thanks A G Szabo agszabo(a)outlook.com<mailto:agszabo@outlook.com>

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Residue information failed
by Kunrong Mei 03 Apr '17

03 Apr '17

Hi all, I have met a problem as I used the mouse pointer to show the residue information. Normally, Chimera automatically displays the residue information (residue name, model ID, chain ID, and residue number...) by default when the mouse pointer is placed at a special position. This is ultra helpful when analyzing structures. My problem is that, after I registered to Chimera today, this function lost and it doesn't show the residue information any more. Has anyone met this kind of problem before? Or does anyone know how to fix it? Thanks, Kunrong

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