December 2013 - Chimera-users - RBVI Mailing Lists

Information
by Mabel Guzman Rodriguez 02 Dec '13

02 Dec '13

Hello! I few days ago I tried to use your program Chimera, the reason is because I try to make a structure of a multimer protein but I need to know how can I bond the single subunits of the protein to make an hexamer. I hope you can help me. Greetings Mabel G.

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Re: [Chimera-users] Chimera- Imod file size problems
by Elaine Meng 02 Dec '13

02 Dec '13

Hi Ariane, I only know how to do it for "volume data" like MRC files and other density maps, but not for IMOD segmentation mesh (You said "imod mrc" but then it sounded like you meant a segmentation file instead.) <http://www.rbvi.ucsf.edu/chimera/docs/UsersGuide/filetypes.html#volume> <http://www.rbvi.ucsf.edu/chimera/docs/ContributedSoftware/volumeviewer/imod…> If it's a density map, you can adjust voxel size in the Volume Viewer (choose Features… Coordinates to show those settings) <http://www.rbvi.ucsf.edu/chimera/docs/ContributedSoftware/volumeviewer/volu…> The same thing can also be done with the volume command, see "dimension and scale options": <http://www.rbvi.ucsf.edu/chimera/docs/UsersGuide/midas/volume.html> Unless data are private, please send Chimera questions to chimera-users(a)cgl.ucsf.edu instead of only to me. Then If I don't know the answer or am away from work, others can respond. Thanks, Elaine ---------- Elaine C. Meng, Ph.D. UCSF Computer Graphics Lab (Chimera team) and Babbitt Lab Department of Pharmaceutical Chemistry University of California, San Francisco On Dec 2, 2013, at 10:45 AM, Ariane Briegel <ariane.briegel(a)gmail.com> wrote: > Dear Elaine, > I have a question you might have a quick answer to. I am trying to open a model file I generated with the IMOD program. > Generally, when I open Imod mrc files in chimera the pixel size is correct in both programs. With this model the size is way off in chimera (I have never used an imod model in chimera before, just mrc files so far). > See screenshots below- the first one shows that the model has the correct pixel size when opened in IMOD, the second shows the wrong size in chimera (the blue and green layers should have the same height as the crystal structures below), and the last screenshot shows how the data opened in chimera (as a mesh). Is there a way for me to manually adjust the pixel size of a mesh? > If you have any idea how I can fix this issue I would be very grateful! > Thank you! > Ariane > <Screen Shot 2013-12-02 at 10.03.41 AM.png><Screen Shot 2013-12-02 at 10.35.06 AM.png><Screen Shot 2013-12-02 at 10.39.27 AM.png> > –––––––––––––––––––––––––––– > Ariane Briegel, Ph.D. > California Institute of Technology > Broad Center, MC 114-96 > 1200 E. California Blvd. > Pasadena, CA 91125 > > Tel: 626-395-8848 > Fax: 626-395-5730 > –––––––––––––––––––––––––––– > > >

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Query about increasing resolution for vrml export
by Darren Gowers 02 Dec '13

02 Dec '13

Dear Chimera community, Sorry to bother. I'm very interested in trying to increase the vrml export resolution (of any pdb model) so that more polygons are used to describe the curvature of the electron density more smoothly. There is a command in PyMol that does the equivalent (I think it is 'surface_quality'), but I'd rather use Chimera to generate vrml files! Does anyone have any suggestions how to make molecular surfaces much smoother please? Many thanks, Darren -- Dr Darren Gowers<http://www.port.ac.uk/departments/academic/biology/staff/title,30538,en.html> Senior Lecturer in Biochemistry School of Biological Sciences University of Portsmouth PO1 2DY +44(0)2392 842057

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Re: [Chimera-users] solvent-accessible surface area
by Amit Goyal 02 Dec '13

02 Dec '13

Hi Elaine, Today I subscribe to Chimera mailing list, but unable to get the proper way to post a query on it. So I am sending the query this way. I have been reading this post about how to get the areaSAS and areaSES values for any residues. http://www.cgl.ucsf.edu/pipermail/chimera-users/2008-May/002617.html Still, I think, is there any specific values/range for the areas AS to decide whether a particular amino acid residues is buried or exposed to the solvent. Hoping for Thanks for your help. Sincerely, AMIT -- AMIT GOYAL, Pusan National University, Korea south. amitgsir(a)pusan.ac.kr

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translation matrix
by Antón Vila Sanjurjo 02 Dec '13

02 Dec '13

Hi, I'm trying to get a translation matrix for two different crystal structures of ribisomal subunits. I've been trying to use the "measure rotation" command but I can only get it to display the following message "rotation angle is near zero (0 degrees)". I was wondering whether the command might be failing due to the fact that the ribosome contains numerous chains, or perhaps because the command does not deal with RNA. At any rate, how would one go about obtaining a translation matrix that can be applied to any model? best, Antón -- Antón Vila-Sanjurjo, PhD Marie Curie fellow Grupo QOSBIOS, Dept. Química Fundamental Facultade de Ciencias Universidade de A Coruña (UDC) Campus Zapateira, s/n 15.071 - A Coruña - España (Spain). tlf: (34) 981-167000 ext:2659 e-mail: antonvila.s(a)gmail.com

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