August 2015 - phenixbb - phenix-online.org

Rank-scaled map
by Jianghai Zhu 21 Aug '15

21 Aug '15

Hi, I know PHENIX can calculate a rank-scaled density map. Could anyone inform me which program in PHENIX actually does this? Thanks. Best, --Jianghai

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external passive 3D monitor with macbook pro or imac for coot and pymol stereo view
by Xiao Lei 21 Aug '15

21 Aug '15

Dear phenixbb members, I'm thinking to view stereo 3D structure on coot and pymol with passive 3D monitor, does anyone have experience of doing this with a macbook pro or imac and a external passive 3D monitor connected using HDMI port? If mac does not support this, should I buy a PC and a passive 3D monitor to do it? Thanks ahead. Xiao

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phenix.refine automatic linking options
by Engin Özkan 20 Aug '15

20 Aug '15

Dear Developers, Using the latest phenix nightly, I observed something odd in the phenix.refine UI, and I thought I should report it. If one unchecks Automatic ligand linking, this seems to not override its options, as the instructions in the Options window suggest. Specifically, if "Automatic Ligand Linking" is unchecked, but the "Link metals" is checked within its Options window, metal link restraints are still created. I checked the .geo file to confirm this. Thanks, Engin

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Phenix on Mageia
by Marie Elizabeth Fraser 19 Aug '15

19 Aug '15

Hello, We are having a problem getting the display of the cycles of Phenix running on our Linux machines. I am running Mageia 4, but the problem first appeared when I added a new student and he started to run Phenix on Mandriva. When I changed to Mageia 4, I had to do a clean install, so everyone got new home directories. Then the problem appeared for all of us. This has gone in as a bug report (and I can send the message if that would help). The response was that we were using a character like “é” in the filename or directory. I do not think that we are. However, at the bottom of the bug report it does say "LATIN CAPITAL LETTER A WITH RING ABOVE = Ã…”, which sounds like the symbol for Angstrom. Has anyone else seen a similar problem and been able to fix it? Thank you, Marie

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planarity between atoms of neighboring residues
by Agnieszka Kiliszek 19 Aug '15

19 Aug '15

Dear All, I would like to add restrains between two residues. I was trying to use geometry restrains planarity but I don't know how to select atoms from two different residues. I mean, I have: chain A resid 1 atoms: C5' C' and O1' chain A resid 2 atom: N1' I would like all 4 atoms to be planar. I found example only for atoms from the same residue. Can you help me? Agnieszka

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Re: [phenixbb] Different cell content than expected in Xtriage
by Singh, Bishal 19 Aug '15

19 Aug '15

Dear Folmer, Thank you very much for your words. Yes! I refined the model after molecular replacement. Electron density is nicely defined for all residues including their side chains. There is no extra electron density. All refinement parameters are fine. Rwork and Rfree are around 22% and 25%, respectively. The model that I used for phaser was a homology model generated from a structure with 60 % sequence identity to my protein. I prefer to use homology model than providing sequence identity in phaser because I think that the local structural errors are more precisely defined in homology models. Thanking you again! Kind regards, Bishal From: Folmer Fredslund <folmerf(a)gmail.com<mailto:[email protected]>> Date: Tue, 18 Aug 2015 15:34:23 +0200 To: noro <b.singh(a)dkfz-heidelberg.de<mailto:[email protected]>> Subject: Re: [phenixbb] Different cell content than expected in Xtriage Hi Bishal, Did you try to refine the model from phaser? Did you check the packing of the 2 molecules? Did you look at the electron density from phaser and see if some of it could look like an extra molecule? It is not impossible to have 70% solvent content, so I don't think you should be too worried, just investigate the result. You probably have another molecule there, phaser was just not able to find it, but you should be able to manually fit it easily. Btw, how similar is your model to your own protein? Hope this helps Folmer Fredslund 2015-08-18 15:02 GMT+02:00 Singh, Bishal <b.singh(a)dkfz-heidelberg.de<mailto:[email protected]>>: Dear all, I am solving crystal structure of a protein of size 33.7kDa in space group P 43 21 2 at 2.25 Å resolution. Unit cells constants are 121.51 121.51 156.6 90 90 90. The cell content analysis in Xtriage showed 1050 residues (~ 3X 33.7 kDa) per ASU with 50 % solvent content, whereas the molecular replacement in mr-phaser produced a dimer (2X 33.7 kDa). When we consider a dimer per ASU, it should have approximately 70 % solvent content. Please suggest me whether solution is right or not. I shall appreciate your opinions. Kind regards, Bishal _______________________________________________ phenixbb mailing list phenixbb(a)phenix-online.org<mailto:[email protected]> http://phenix-online.org/mailman/listinfo/phenixbb Unsubscribe: phenixbb-leave(a)phenix-online.org<mailto:[email protected]> -- Folmer Fredslund

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Coot mutation of Asp residue to isoAsp residue
by Xiao Lei 19 Aug '15

19 Aug '15

Dear Phenixbb members, I suspect one Asp residue in my model may be an isoAsp (isomerization of Asp). I am asking if there is way to mutate Asp residue to isoAsp(isoaspartic acid) residue in coot GUI (I'm using coot 0.8.1 EL in Mac OS X10.10.5)? I know there is a mutation button on coot, but the mutated aa lists are all natural amino acids. If I have to delete the Asp residue first and then build isoAsp into the density map, is there a way in coot to build an isoAsp residue in map? Thanks ahead. Xiao

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Different cell content than expected in Xtriage
by Singh, Bishal 18 Aug '15

18 Aug '15

Dear all, I am solving crystal structure of a protein of size 33.7kDa in space group P 43 21 2 at 2.25 Å resolution. Unit cells constants are 121.51 121.51 156.6 90 90 90. The cell content analysis in Xtriage showed 1050 residues (~ 3X 33.7 kDa) per ASU with 50 % solvent content, whereas the molecular replacement in mr-phaser produced a dimer (2X 33.7 kDa). When we consider a dimer per ASU, it should have approximately 70 % solvent content. Please suggest me whether solution is right or not. I shall appreciate your opinions. Kind regards, Bishal

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"Table 1" wavelength
by mohamed noor 16 Aug '15

16 Aug '15

Dear all A trivial question but just to be sure: For a structure phased and built using MR-SAD with a dataset collected at one wavelength and refined with a higher-resolution dataset at a different wavelength, how should the wavelength be reported in "Table 1"? And what if the higher-resolution dataset is not isomorphous to the anomalous dataset? Is it sensible to do MR-SAD first, redo MR with the better dataset against the MR-SAD model and then refine at the higher resolution (about 0.8 A better)? Thanks.

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Post-doctoral position in Structural Biology at the Goethe-University Frankfurt, Germany
by Maike Bublitz 14 Aug '15

14 Aug '15

Dear all, please find below a job announcement posted on behalf of my colleague Jun. Prof. Inga Hänelt at the Goethe-University Frankfurt: The Structural Biology of Membrane Transporters group of Inga Hänelt, Institute of Biochemistry at the Goethe University in Frankfurt am Main invites a post-doctoral researcher to join the Emmy Noether project “Determinants of ion channel versus transporter mechanism in the K(+) transporter superfamily“. The project is in need of a candidate with strong biochemical skills for membrane protein purification and/or experience in protein crystallization. If you are interested in further information please follow the link below. http://biochem.uni-frankfurt.de/fileadmin/user_upload/MechanismsMembraneTra… <http://biochem.uni-frankfurt.de/fileadmin/user_upload/MechanismsMembraneTra…> Contact Information for this post: Dr. Inga Hänelt Juniorprofessor for Biochemistry Institute of Biochemistry, Biocenter N220/1.03 Goethe-University Frankfurt Max-von-Laue-Str. 9 60438 Frankfurt Phone: 0049-69-798-29261 Fax: 0049-69-798-29495 Email: Haenelt(a)biochem.uni-frankfurt.de <mailto:[email protected]> -- Dr. Maike Bublitz Department of Biochemistry, Biocenter Goethe University Frankfurt Max-von-Laue-Str. 9 60438 Frankfurt am Main Germany phone: +49 (0)69 798 29274 bublitz(a)em.uni-frankfurt.de <mailto:[email protected]>

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