- phenixbb - phenix-online.org

get_cc_mtz_pdb for neutron data table
by Maxime Cuypers 27 Feb '15

27 Feb '15

hi, i need the correlation coefficients map/residues for a publication, which command should i use to get phenix.get_cc_mtz_pdb to take into account the neutron scattering tables? seems it uses the x ray tables by default. i can not find it on this page: http://www.phenix-online.org/version_docs/1.8.3-1472/get_cc_mtz_pdb.htm#anc… many thanks for your reply. -- Dr. Maxime Cuypers

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hiding clash dots
by Sebastiano Pasqualato 26 Feb '15

26 Feb '15

Hi all, a quick question: how do I get rid of the clash dots that appear in Coot, when opened from a phenix job? thanks a lot in advance, best, Sebastiano -- Sebastiano Pasqualato, PhD Crystallography Unit Department of Experimental Oncology European Institute of Oncology IFOM-IEO Campus via Adamello, 16 20139 - Milano Italy tel +39 02 9437 5167 fax +39 02 9437 5990 web http://is.gd/IEO_XtalUnit <http://is.gd/IEO_XtalUnit>

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on phenix.cut_out_density
by Smith Lee 26 Feb '15

26 Feb '15

Dear All, Can the mtz file produced by phenix.cut_out_density be used by Phenix refine for refinement? Smith

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a sharp rise of R-free in resolution bin
by Singh, Bishal 25 Feb '15

25 Feb '15

Hello everyone, I am refining a structure at 2.3 A resolution. R-work/R-free is 26/31 and is not reducing further. When I looked into the resolution bin, I notices a sharp rise of R-free between resolution range 2.5-2.6 A (marked in figure below). However R-work is fine. I am doubtful of reducing the resolution to 2.5 A or lower. Please suggest me your opinion. Your words will be highly appreciated. With regards, Bishal Singh PhD Student University of Heidelberg, Germany

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How to define a disulfide bond between symmetry related molecules in phenix.refine
by Michael Hothorn 25 Feb '15

25 Feb '15

Dear all, I am trying to refine an intermolecular disulfide bond in phenix.refine. The disulfide involves Cys 188 in chain A and Cys 188 of chain B of a symmetry related molecule, with symop -X, Y+1/2, Z+1/2. There are two molecules in the AU, SG is P212121. I generated the following SSBOND entry in the pdb header: SSBOND 2 CYS A 188 CYS B 188 1555 3555 2.04 Based on this: http://www.wwpdb.org/documentation/file-format/format33/sect6.html the format seems fine, but the disulfide is not being recognized during refinement. Could someone point out to me how to correctly define this for phenix.refine. Thanks! Michael

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sharp rise of R-free in resolution bins
by Singh, Bishal 25 Feb '15

25 Feb '15

Hello everyone, I am refining a structure at 2.3 A resolution. R-work/R-free is 26/31 and is not reducing further. When I looked into the resolution bin, I notices a sharp rise of R-free between resolution range 2.5-2.6 A (marked in figure below). However R-work is fine. I am doubtful of reducing the resolution to 2.5 A or lower. Please suggest me your opinion. Your words will be highly appreciated. With regards, Bishal Singh PhD Student University of Heidelberg, Germany

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On Ramachandran restraints of Phenix refine
by Smith Lee 25 Feb '15

25 Feb '15

Dear All, If my resolution was between 2.5-3.0 A, and if I did not use Ramachandran restraints in the Phenix refine the Ramachandran outliers would be increased significantly during the refinement process, in this situation may I use Ramachandran restraints in the Phenix refine? I am looking forward to getting your reply. Smith

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Bug? phenix.hyss crashes on reading CNS def file
by Mark A Saper 24 Feb '15

24 Feb '15

I am trying the example described on this documentation page: http://www.phenix-online.org/download/documentation/cci_apps/hyss/examples.… For mbp.hkl the HySS command suggested is: phenix.hyss $CNS_SOLVE/doc/html/tutorial/data/mbp/mbp.hkl 4 yb —symmetry $CNS_SOLVE/doc/html/tutorial/data/mbp/def The software does not expect the “{“ character in the def file. I can send you the Traceback on request. I am running dev-1951. -Mark

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on TLS for Phenix refine
by Smith Lee 22 Feb '15

22 Feb '15

Dear All, For TLS, the document says, "Can I use both TLS and anisotropic ADPs? Yes, but not for the same atoms - since TLS is essentially constrained anisotropic refinement, the two methods are mutually exclusive". In the "Refinment settings" of the Phenix refine graphical interface, will you please tell me which button is for the anisotropic ADP? The individual B-factors, or the Group B-factors, or only the "Optimize X-ray/ADP weight"? I am looking forward to getting your reply. Smith

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Odd behaviour of real-space refinement
by Tristan Croll 22 Feb '15

22 Feb '15

Hi all, I'm just finalising the re-refinement of a 3.6 Angstrom structure. The stats in general are excellent (Rwork/Rfree = 0.219/0.260; Ramachandran outliers 0.12%; Clashscore < 2; rotamer outliers 2.1%) and I've gone through the whole structure to check and double-check fit to the density. I'm very confident that it's effectively correct. When I run through a fairly standard refinement protocol (XYZ coords, Individual B-factors, optimizing weights, secondary structure restraints), all seems fine - the Rfree rattles around within 0.2% or so. But when I include the real-space refinement option, very strange things start to happen. Each rsrl step causes a 3-4% jump in both Rwork and Rfree, and jumps the Clashscore up to 40 or so. Rotamer outliers briefly go to zero but then increase substantially (to 6+%) in subsequent steps, and the number of Ramachandran outliers increases. I thought I'd missed some dreadful error in my structure until I looked more closely at the results. Some very nonsensical changes have been made - for example, an arginine in the middle of a beta-sheet (admittedly with no observable density associated with its sidechain, but register is well determined by surrounding residues and backbone density is clear) was flipped from its original orientation to point directly into the hydrophobic core of the domain. Somewhat surprising, to say the least. Is this a bug in the algorithm, or is it simply that 3.6A is too low resolution for it to work reliably? My version of Phenix is a nightly build from about 2 weeks ago. Happy to share coordinates and log files if necessary. Thanks, Tristan

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