- Chimera-users - RBVI Mailing Lists

morph map tool EM density
by Franken, L.E. 14 Apr '16

14 Apr '16

Hi all, I am fairly new to using chimera and was wondering if there is a way to get more control over the path that is calculated when morph map is used for two EM density maps that are different conformations. When I use the tool now it will change the visible density a great deal and rather than rotating only a certain part of the map the result seems quite confusing to look at as the whole structures move. Is there a way to fix some areas while alowing to morph subregeons? Or does anyone have a better idea on how to approach this? the map is a dimer and the change is suposed to be a difference in rotation between the two monomers. Ideally I would show this by fixing two monomers ontop of each other and allowing the other halfs to move. Thank you in advance, Linda

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more
by A G Szabo 14 Apr '16

14 Apr '16

For some reason unknown to me it appears that my registration has expired. One serious matter is that all the PY files no longer seem to exist on the Chimera site, even though they are listed on the right side of the window. I trust that I can have my registration renewed. Arthur G. Szabo.

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issues
by A G Szabo 14 Apr '16

14 Apr '16

I just sent Chimera an email regarding a window that opened up regarding expiry of my registration. I was able to fetch a PDB file, 1GPA But the menu actions do not appear to work as they used to. I try to hide the selected ribbon, and instead of hiding it the color changes. Eventually with some persistence I can hide one of the chains. Do I have to reregister? Thank you Arthur G. Szabo

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Re: [Chimera-users] Density display with CHIMERA
by Elaine Meng 14 Apr '16

14 Apr '16

On Apr 13, 2016, at 9:27 AM, F.Xavier Gomis-Rüth <fxgr(a)ibmb.csic.es> wrote: > Dear Elaine, > I am encountering problems while trying to display a fragment of a structure from a PDB file superimposed > with its Fourier map. When I load the latter, it is presented displaced from the model and I cannot get it centered > onto it. All other features (contouring, mesh/solid style, etc.) work fine, it's just that atoms and density do not superimpose. > I've tried it with different space groups, just for the case it was a problem in a particular library, but without success. > I am working on a Mac, I don´t know if there is a problem, and I am using CCP4 maps. > Any suggestions would be very welcomed! > Best wishes, > Xavier > -- > <fxgr_signanew.jpg> Dear Xavier, I don’t know where or from what program these files came frome, so it is hard to say why the coordinates don’t match up. In some cases the map file does not include information that aligns its coordinates with the corresponding atomic structure, or maybe the map file header does have this information but it is not in a format understood by Chimera. You can change the offset of the map in Chimera, if you know what it should be. After opening the map, in the Volume Viewer dialog choose Features… Coordinates, and in the resulting options you can change origin index, spacing, etc. However, I don’t know how to figure out what values are needed, if you don’t already have that information. The options are explained here: <http://www.rbvi.ucsf.edu/chimera/docs/ContributedSoftware/volumeviewer/fram…> <http://www.rbvi.ucsf.edu/chimera/docs/ContributedSoftware/volumeviewer/volu…> It is generally recommended to send Chimera questions to chimera-users(a)cgl.ucsf.edu (CC’d here), especially in certain areas where others know more than I do. I hope this helps, Elaine ----- Elaine C. Meng, Ph.D. UCSF Computer Graphics Lab (Chimera team) and Babbitt Lab Department of Pharmaceutical Chemistry University of California, San Francisco

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PDB file created by a protein—protien docking tool ZDOCK can not opened by Chimera
by 赵思雨 13 Apr '16

13 Apr '16

Excuse me： Thanks for your good tool.I'am a student studying bioinformatics.I have met a trouble.My PDB file created by a protein—protien docking tool ZDOCK.It can not opened by Chimera.But can opened by Jmol and DS ViewerPro Trial.While the graphic created by Chimera is more beautiful. One of the PDB file is in the accessory. Thanks Siyu Zhao

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mmCIF lacks peptide bonds
by Michael Blaisse 13 Apr '16

13 Apr '16

Hello, I'm solving a crystal structure and as I'm preparing to submit the final structure to PDB, I used the PDB_Extract tool to convert my final refined .pdb to an mmCIF file as per the request of PDB. After I do this, however, I noticed that if I open the CIF file in Chimera, it does not have any connectivity between the residues. This does not appear to be a problem in PyMOL. Less importantly, I also had a question about the Sequence view in Chimera. I have a break in my chain due to unmodelled residues, and I noticed that if I float my cursor over a residue in the sequence, it shows the correct residue number at the bottom of the window, however the numbering at the side of the sequence view window is wrong after the break because it does not take the chain break into account. I appreciate any advice/help people can offer. Thanks, Mike

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Electrostatic potential surface area
by Yasser Almeida Hernández 13 Apr '16

13 Apr '16

Hi all, I did some calculations of the electrostatic potential using APBS and Delphi. I want to calculate the surface area of a positive patch in my protein. There is a way to select and compute the surface area/patch, filtering by the electrostatic surface value? Thanks in advance Yasser

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Re: [Chimera-users] fivefold rotate command
by Cheng-Chen Xu 13 Apr '16

13 Apr '16

Hi Tom, Very nice example. Really big help! Just updated to the newest Chimera version, done! Thanks again for your time and patience. Chen > -----Original Messages----- > From: "Tom Goddard" <goddard(a)sonic.net> > Sent Time: Wednesday, April 13, 2016 > To: "Cheng-Chen Xu" <xucc(a)wh.iov.cn> > Cc: > Subject: Re: [Chimera-users] fivefold rotate command > > Hi Chen, > > Yes you can rotate the pentamers of a T=1 icosahedral capsid in Chimera using the “turn” and “sym” commands. The hardest part is figuring out the direction of the 5-fold axis. Here’s an example > > open 2bpa > open 2bpa > sym #1 update true coord #0 > # Select opposite pentamers by hand (10 monomers total) with mouse and up-arrow key > define axis sel > turn a1 5 model #1 > > I open 2 copies of the virus, the first copy (#0) just serves as a reference coordinate system when I move the second copy (#1). The sym command makes the 60 copies of #1 for the full virus and the “update” option says to update all the positions when copy #1 moves relative to #0. Then I define an axis (called a1) by selecting two opposite pentamers including the #1 monomer. Then I rotate monomer #1 about that axis by 5 degrees, and all the other 60 copies will move automatically to maintain symmetry. Here’s a movie illustrating the motion. > > http://www.cgl.ucsf.edu/home/goddard/temp/spin_5fold.mp4 > > Tom > > > > On Apr 11, 2016, at 8:42 PM, Cheng-Chen Xu wrote: > > > > Hi Chimera, > > Is there anyway to rotate each pentamer around its own fivefold axis separately and simultaneously when dealing with a T=1 icosahedral virus capsid? > > Many thanks, > > > > Chen > > > > > > > > > > > > _______________________________________________ > > Chimera-users mailing list: Chimera-users(a)cgl.ucsf.edu > > Manage subscription: http://plato.cgl.ucsf.edu/mailman/listinfo/chimera-users >

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Other Tools button not present in the Segment Map Dialog
by silvia desanctis 13 Apr '16

13 Apr '16

Dear all, I have performed a segmentation on my map but if I click the Shortcuts button in the Segment Map dialog I cannot see the Other Tools section where I would select the Fit, Extract, rSeg or SegLoop tools. Why not? I updated to the daily built version of Chimera just yesterday so I have no idea why this complete line of tools is missing. Greeetings Silvia

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Mirrored density artefact
by Morris, Kyle 13 Apr '16

13 Apr '16

Dear Chimera dev and community, I am using "vop cover” to extract a box of density around a PDB and making the box quite large with the following: $ vop cover #0 atomBox #1 pad 55 I have noticed in the extracted density that as I increase the pad size the true density gets duplicated and mirrored on the opposite edge of the cell containing the volume. This seems like strange behaviour to me, is there something wrong or that I am doing wrong? Many thanks for your help. Best, Kyle

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