November 2010 - phenixbb - phenix-online.org

automr/phaser : b-factors
by Bryan Lepore 19 Nov '10

19 Nov '10

does (or can) phaser use the search probe B-factors in any way? -Bryan

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CRYST card being changed
by Nino Campobasso 18 Nov '10

18 Nov '10

Phenix developers, When I run a refinement, it appears that the CRYST card is not being written as expected by programs like pymol and coot. I'll start with a file that has C 1 2 1 and phenix.refine will write out C2 . If I attempt to view symmetry related molecule within coot or pymol, these programs complain that there is no symmetry op. If "fix" the spacegroup in the CRYST line, pymol and coot are happy and generate the related molecules. Best, Nino

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autobuild : rigid?
by Bryan Lepore 18 Nov '10

18 Nov '10

dev-572 my understanding of the autobuild<->refine keyword table on the website is that there's no rigid body available through autobuild - is that right? -Bryan

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reflection file converter
by r n 17 Nov '10

17 Nov '10

Hi I did tried reflection file converter in phenix. I do have the anomalous data, like to keep all anomalous difference and also merged F and FreeR for refinement. Phenix GUI give me an warning message that "File are not suitable for amplitudes change them as F or leave them as Intensities" Also have hard time to convert them in command line, Is there any auto script that can work similar to scaelpack2mtz , which keeps all I+, I- and F , SigF, Rfree for refinement. Converted using Phenix.refine , that keeps separate I+, I- and Rfree+, Rfree-. Thanks ram

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link restraints for modified nucleotides in RNA
by Gerwald Jogl 17 Nov '10

17 Nov '10

Hi All, I am refining several modified nucleotides in ribosomal RNA (N2-methyl-guanosine and similar). While the restraints generation with phenix.reel work quite well, I am unable to get the phosphate oxygen restraints applied properly. Phenix.refine recognizes the links but for some reason the phosphate groups come out quite distorted... For example, angles after refinement: O3 (1) - P (2, modified) - OP2 (2) = 80 deg and O3 (1) - P (2, modified) - OP1 (2) = 127 deg Here is part of the phenix.refine log on reading the coordinates: Chain: "A" Number of atoms: 32526 Number of conformers: 1 Conformer: "" Number of residues, atoms: 1513, 32526 Unusual residues: {'MA6%rna3p': 2, '5MC%rna3p': 3, '5MC%rna2p': 1, '7M G%rna3p': 1, '2MG%rna3p': 1, 'UR3%rna2p': 1, 'M2G%rna3p': 1, '4OC%rna3p': 1} Classifications: {'undetermined': 11, 'RNA': 1502} Modifications used: {'5*END': 1, 'rna3p': 1318, 'rna2p': 195} Link IDs: {'rna3p': 1318, 'rna2p': 194} Chain breaks: 1 I am at a loss about how to fix this as all links and restraints seem to be in place. Many thanks for advice, Gerwald

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phaser and automr
by Bryan Lepore 16 Nov '10

16 Nov '10

IIUC, phaser keywords cannot be provided to phenix.automr - is that right? i.e. if that's the case, then i ought to run phenix.phaser. -bryan

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automr : [1] MAP_COEFFS [2] output pdb's of ensemble
by Bryan Lepore 16 Nov '10

16 Nov '10

dev-572 [1] in automr, i do not understand why only the last MR.MAP_COEFFS.n.mtz is written- e.g. i don't get 1-9 if 10 models are requested as output. (MR.[1-n].mtz are written ok). [2] when using an ensemble, i gather that the output is *hardwired* for the best rmsd model - i.e. there are no keywords to write out all parts of the ensemble. (i know i can run pdbset for them, but anyways...) -Bryan

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automr : *refinement* resolution limit keyword?
by Bryan Lepore 16 Nov '10

16 Nov '10

[ dev-572 ] i'm wondering if users can set the *refinement* resolution limits in automr? the webpage suggests this, but it wasn't clear to me. i can set the search resolution fine, however by default as indicated, all data is used - and the only other keyword i see that would at all be relevant is the building resolution. -Bryan

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refine : annealing temperature
by Bryan Lepore 13 Nov '10

13 Nov '10

just wondering if the annealing temperature in phenix is absolutely the same as in cns. -Bryan

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Question about restraints
by Schubert, Carsten [PRDUS] 13 Nov '10

13 Nov '10

Hi, I was wondering what the default values for restraints in reel/elbow represent in terms of 'tightness' for lack of a better word. I am trying to tighten up the geometry of a badly behaving ligand and want to avoid over tightening. What is the consensus out there what kind of ESDs represent a 'loose' 'medium' and 'tight' restraint for bond, angle, dihedral, planar and chiral restraints. Thanks Carsten

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