- Chimera-users - RBVI Mailing Lists

How to analyze cryo-EM reconstruction map of virus and prepare publishable figures?
by sunyeping 11 Sep '19

11 Sep '19

Dear all, I am new to cryo-EM structural biology. Now I have a cryo-EM reconstruction map for a virus particle. I wish to analyze the characteristics of the virus, such as the h, k and t number, the component of an cryo-EM asymmetric unit of the capid and prepare some publishable figures. I have no idea how to do these things. Could all these be done with Chimera? Is there any tutorials or manual for these calculation, visualization and drawing? If you could recommend some ways by which I can learn to do these, I would be greatly grateful. Best regards

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APBS electrostatic potential map not visible
by Ahmad Khalifa 10 Sep '19

10 Sep '19

Hello, After PDB2PQR and APBS calculation, I get an .dx that I can't view (doesn't appear when I click show), let alone color. I tried to launch volume viewer, it does display a surface. What am I doing wrong? Regards.

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Modeller from a Python script
by Samo Lešnik 10 Sep '19

10 Sep '19

Dear Madam/Sir, I would like to run the Modeller missing loop function implemented in Chimera by using a Python script, as I want to go through a number of protein structures. Is this possible? I do not find the appropriate commands in the comand list. I would use a local instalation of Modeller. Thank you for your help. Best regards, Samo

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DNA drawing inquiry
by Woorim Choi 09 Sep '19

09 Sep '19

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Way to compute residue wise RMSD using python script in chimera:
by Kamalesh Damodaran 09 Sep '19

09 Sep '19

Dear sir/madam, I would like to superimpose the two structures and compute the residue wise RMSD values. With Gui support in chimera, I opened the two structures and used Matchmaker to superimpose two structures. In Matchmaker, I checked the box 'Show pairwise alignment(s)' and click Apply, subsequently it displays MultAlignViewer dialogue box, where --> Headers --> RMSD : backbone --> Save --> filenamegiven. This process would give me residue wise RMSD score only for backbone atoms in .hdr format. I wants to write python script to do the same, so that I will compare large number of structures, and my script is able to perform till the procedure of superimposition using matchmaker and display MultAlignViewer dialogue box. I don't know the way to store the RMSD : backbone and RMSD : calpha in .hdr format using python script through chimera. Can some one please help me in this. The reason why I specifically want to do in this approach is, because among the two structures, some residues of one structure is missing. Since this approach will compute RMSD only for the matching residues, I am interested in this. Hope my question is not confusing. Thanks in advance. Best regards, Kamalesh D.

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cage builder
by Artur Biela 06 Sep '19

06 Sep '19

Hi all, I would like to build a cage model using cage builder, but the problem is that I need to use different polygons than available in the pop-up window of cage builder. My question is: is there any option to use for example octagons, decagons or even more-gons? Thank in advance Artur =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= Artur BIELA, PhD Scientific Assistant Bionanoscience and Biochemistry Laboratory Malopolska Centre of Biotechnology Jagiellonian University 7A, Gronostajowa Street 30-387 Krakow Poland Department of Cell Biology and Imaging Institute of Zoology and Biomedical Research Jagiellonian University Gronostajowa 9 30-387 Krakow artur.biela(a)uj.edu.pl http://www.mcb.uj.edu.pl/en_GB/heddle-laboratory publons<https://publons.com/mashlets?el=badgeCont570&rid=M-3954-2019> =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

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How could I know the segment label
by Huiya Zhou 03 Sep '19

03 Sep '19

Hi, I use the “Segment Map” for the volume data to divide the density map into parts. How could I know the information of each region? For example, the label, the average value of each region. I also would like to know the regions which are connected with one specific region. How could I obtain information in python script? Thanks, Huiya

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Support chimera
by Jose Alirio Mendoza Mesa 03 Sep '19

03 Sep '19

Hi there, my name is Jose Alirio Mendoza. Currently, I am carrying out my PHD thesis in which I am using the chimera program to show the tomography results. Nevertheless, I am being presented some problems when trying to measure my particle in Chimera. The file of my product is “mrc” and I have been investigating about chimera usage where I have realized that the file must be “pdb” for the program to recognize it. I do not really know how to convert my molecule to the required file, and I guess that is the problem by which I cannot measure the distance of my particle. When I click “tools – structure analysis – distance” it does not appear the code of my molecule as in picture below [image: imagen.png] This is my particle and what I get when using the tool for measuring. I have other three tomography for one publication. [image: imagen.png] There is not any code in the tool square and that is why I guess to no be able to measure the particle. Other tool I tried to use is the scale bar, however the value of it is not according to my calibration. [image: imagen.png] How may I change that calibration? In our research group we want the publish the articles citing chimera as visualization tool so we would really appreciate your help. Here is attached the file we have worked in chimera. pollo 13.mrc <https://drive.google.com/a/unal.edu.co/file/d/1cAs2g1kP88o8im65xuTbOz11o9pk…> -- *Qco. JOSE ALIRIO MENDOZA MESA* Candidato a Doctor en ciencias Universidad Nacional de Colombia. 3165000 Ext. 14475 *LABORATORIO DE CATALISIS HETEREOGENEA*

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Re: [Chimera-users] code 256
by Greg Couch 30 Aug '19

30 Aug '19

Like I said before in http://plato.cgl.ucsf.edu/pipermail/chimera-users/2019-August/016113.html, you need to use the daily build of Chimera. Go the Chimera download web page, http://www.cgl.ucsf.edu/chimera/download.html. Scroll down past the 1.13.1 downloads, and pick the 64-bit Linux daily build version to download. Then install it. When 1.14 comes out, it will not have this problem. -- Greg On 8/29/2019 11:22 PM, Aleksandra Jarmołowicz wrote: > > I am using Ubuntu 19.04. So what can I do to use Chimera with this > version? Before update of the system programme runs well. > > Aleksandra Jarmołowicz > Ph.D. Student > > Department of RNA Structural Genomics > Institute of Bioorganic Chemistry > Polish Academy of Sciences > Z. Noskowskiego str. 12/14 > 61-704 Poznań > Phone: +48 61 852 8503 ext 143 > ajarmolowicz(a)ibch.poznan.pl <mailto:ajarmolowicz@ibch.poznan.pl>

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Buried_area python function
by Kevin Wang 29 Aug '19

29 Aug '19

Hi, I am trying to use the buried_area function below. What are the arguments that I need to pass in? def buried_area(operation, atoms1, atoms2, probeRadius = 1.4, vertexDensity = 2.0): My current code is as follows: #calculate buried area import os import chimera import xlsxwriter from Measure import measure from chimera import * workbook = xlsxwriter.Workbook('contactArea.xlsx') worksheet = workbook.add_worksheet() Path = "/Users/kevinwang/desktop/VEGFR_NO_LIGAND/results/clustering/pdbfit/split" i = 0 filelist = os.listdir(Path) for x in filelist: if x.startswith("trp.pdb."): #if (x == "trp.pdb.00001"): opened = chimera.openModels.open(x, type ="PDB") chimera.update.checkForChanges() try: runCommand('surface :286-596') runCommand('surface :899-1230') y = measure.buried_area() worksheet.write(i,0,x) worksheet.write(i,1,y) except: worksheet.write(i,0,x) worksheet.write(i,1,"ERROR") i = i + 1 print("Processed: " + x) print("Total #: " + str(i)) runCommand('close all') chimera.update.checkForChanges() workbook.close() Best, Kevin

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