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combinding two CIF's and creating links in elbow
by Yarrow Madrona 05 Oct '11

05 Oct '11

Hello, 1. I have a question on creating links using elbow. I have a CIF of NO and I want to define a chemical link between NO and Fe of a HEME group. I need to input the geometry as NO is acting as a metal ligand. I really don't know where to begin. Any help would be greatly appreciated. 2. Is there a quick way of combining CIF files into one large file without a lot of copy and pasting? Thank you. -- Yarrow Madrona Graduate Student Molecular Biology and Biochemistry Dept. University of California, Irvine Natural Sciences I, Rm 2403 Irvine, CA 92697

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Phenix version 1.7.2 released
by Paul Adams 01 Oct '11

01 Oct '11

The Phenix developers are pleased to announce that version 1.7.2 of Phenix is now available. Binary installers for Linux, and Mac OSX platforms are available at the download site: http://phenix-online.org/download/ Some of the new features in this version are: Graphical interface: ==================== - phenix.data_viewer added under Reflection Tools - New GUIs: HySS, phenix.cut_out_density, phenix.reciprocal_space_arrays General: ======== - New commands: phenix.cut_out_density, phenix.data_viewer, phenix.morph_model - Default map output format changed to CCP4 - Native support for CIF-format reflection files (e.g. from PDB) in many commands and GUI Refinement: =========== - New Xray/restraints weight optimization. Keywords optimize_wxc and optimize_wxu replaced with optimize_xyz_weight and optimize_adp_weight, respectively. - Grid searches parallelized: use 'nproc' parameter to set number of CPUs to use - this affects bulk solvent mask optimization, and XYZ and ADP weight optimization (in addition to TLS identification) - can reduce runtime by 75% or more depending on settings (see manual for details) - Modified non-bonded parameters resulting in improved geometry, especially at low resolution - Rigid-body refinement mode defaults to grouping by chain - Printout of validation statistics during coordinate refinement - Bug fix in phase-combined map calculation results in significantly improved maps - Bug fix in X-ray/ADP restraints weight calculation results in smaller B-factors deviations for bonded atoms - Experimental feature (still in testing): - Torsion-space NCS (ncs.type=torsion), automatic parameterization, similar to reference model restraints - Uses top-out potential to allow deviations between NCS related atoms New commands: ============= - phenix.cut_out_density: - carve out a region from map coefficients (MTZ file) - density may be specified as a sphere, a box, or masked around a PDB file - phenix.data_viewer: - visualization of reciprocal-space reflection data - 3D OpenGL view of all data, or 2D view of planes (pseudo-precession photograph) - phenix.morph_model: - Use after molecular replacement to improve model for rebuilding - Morphs model to match a prime-and-switch map Molecular Replacement: ====================== - Phaser (and AutoMR wizard): - significant speedup of fast rotation function Miscellaneous: ============== - phenix.reel: - better integration with main GUI, especially eLBOW - phenix.fobs_minus_fobs_map: - option to disable strict unit cell isomorphism check - phenix.ramalyze: - optional output of PNG images of Ramachandran plots; add --plot to command line arguments - phenix.fetch_pdb: - new flags: --all fetches PDB, CIF, and FASTA files simultaneously --mtz runs phenix.cif_as_mtz on downloaded CIF file For a full list of changes see: http://www.phenix-online.org/documentation/CHANGES Please note that this publication should be used to cite use of Phenix: PHENIX: a comprehensive Python-based system for macromolecular structure solution. P. D. Adams, P. V. Afonine, G. Bunkóczi, V. B. Chen, I. W. Davis, N. Echols, J. J. Headd, L.-W. Hung, G. J. Kapral, R. W. Grosse-Kunstleve, A. J. McCoy, N. W. Moriarty, R. Oeffner, R. J. Read, D. C. Richardson, J. S. Richardson, T. C. Terwilliger and P. H. Zwart. Acta Cryst. D66, 213-221 (2010). Full documentation is available here: http://www.phenix-online.org/documentation/ There is a Phenix bulletin board: http://www.phenix-online.org/mailman/listinfo/phenixbb/ Please consult the installer README file or online documentation for installation instructions. Direct questions and problem reports to the bulletin board or: help(a)phenix-online.org and bugs(a)phenix-online.org Commercial users interested in obtaining access to Phenix should visit the Phenix website for information about the Phenix Industrial Consortium. The development of Phenix is principally funded by the National Institute of General Medical Sciences (NIH) under grant P01-GM063210. We also acknowledge the generous support of the members of the Phenix Industrial Consortium. -- Paul Adams Deputy Division Director, Physical Biosciences Division, Lawrence Berkeley Lab Division Deputy for Biosciences, Advanced Light Source, Lawrence Berkeley Lab Adjunct Professor, Department of Bioengineering, U.C. Berkeley Vice President for Technology, the Joint BioEnergy Institute Head, Berkeley Center for Structural Biology Laboratory Research Manager, ENIGMA Science Focus Area Building 64, Room 248 Tel: 1-510-486-4225, Fax: 1-510-486-5909 http://cci.lbl.gov/paul Lawrence Berkeley Laboratory 1 Cyclotron Road BLDG 64R0121 Berkeley, CA 94720, USA. Executive Assistant: Louise Benvenue [ LBenvenue(a)lbl.gov ][ 1-510-495-2506 ] --

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Twinned Refinement in P 1 21 1
by Yuri 29 Sep '11

29 Sep '11

I dont see spcgrp number 20 on here? Should I be concerned? >>> Unit cell: (44.767, 130.64, 88.33, 90, 104.6, 90) Space group: P 1 (No. 1) Angular tolerance: 5.000 degrees Similar symmetries ================== Symmetry in minimum-lengths cell: C m m m (x+y,2*y,z) (No. 65) Input minimum-lengths cell: (44.767, 88.33, 130.64, 90, 90, 104.6) Symmetry-adapted cell: (44.767, 88.36, 130.64, 90, 90, 104.674) Conventional setting: C m m m (No. 65) Unit cell: (44.767, 170.956, 130.64, 90, 90, 90) Change of basis: x-1/2*z,1/2*z,-y Inverse: x+y,-z,2*y Maximal angular difference: 0.079 degrees Symmetry in minimum-lengths cell: C 1 2/m 1 (x-y,2*x,z) (No. 12) Input minimum-lengths cell: (44.767, 88.33, 130.64, 90, 90, 104.6) Symmetry-adapted cell: (44.767, 88.36, 130.64, 90, 90, 104.674) Conventional setting: C 1 2/m 1 (No. 12) Unit cell: (170.956, 44.767, 130.64, 90, 90, 90) Change of basis: 1/2*z,-x+1/2*z,-y Inverse: x-y,-z,2*x Maximal angular difference: 0.079 degrees Symmetry in minimum-lengths cell: C 1 2/m 1 (x+y,2*y,z) (No. 12) Input minimum-lengths cell: (44.767, 88.33, 130.64, 90, 90, 104.6) Symmetry-adapted cell: (44.767, 88.36, 130.64, 90, 90, 104.674) Conventional setting: C 1 2/m 1 (No. 12) Unit cell: (44.767, 170.956, 130.64, 90, 90, 90) Change of basis: x-1/2*z,1/2*z,-y Inverse: x+y,-z,2*y Maximal angular difference: 0.079 degrees Symmetry in minimum-lengths cell: P 1 1 2/m (No. 10) Input minimum-lengths cell: (44.767, 88.33, 130.64, 90, 90, 104.6) Symmetry-adapted cell: (44.767, 88.33, 130.64, 90, 90, 104.6) Conventional setting: P 1 2/m 1 (No. 10) Unit cell: (44.767, 130.64, 88.33, 90, 104.6, 90) Change of basis: x,y,z Inverse: x,y,z Maximal angular difference: 0.000 degrees Symmetry in minimum-lengths cell: P -1 (No. 2) Input minimum-lengths cell: (44.767, 88.33, 130.64, 90, 90, 104.6) Symmetry-adapted cell: (44.767, 88.33, 130.64, 90, 90, 104.6) Conventional setting: P -1 (No. 2) Unit cell: (44.767, 88.33, 130.64, 90, 90, 104.6) Change of basis: x,z,-y Inverse: x,-z,y Maximal angular difference: 0.000 degrees -- Yuri Pompeu

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Twin Refinement in P 1 21 1
by Yuri 27 Sep '11

27 Sep '11

So in other words, if I input the reflection and the space group as P 1 21 1 (lower symmetry vs the initially attempted C 2 2 21), and I specified the operator in the refinement parameters I should be ok, right? Thank you -- Yuri Pompeu

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Twin Refinement in P 1 21 1
by Yuri 27 Sep '11

27 Sep '11

Hello everyone, I have a twinned data set with PM twin operator h,-k,-h-l I was able to input the twin law into the refinement parameters, however I do not see a place that asks me for the law when generating the Rfree flags. Could someone point me in the right direction? Best, -- Yuri Pompeu

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renaming an holo PDB after the alo one
by Francois Berenger 27 Sep '11

27 Sep '11

Hello, I have one bound complexe (a ligand + a protein in holo conformation). I also have the apo structure for a very similar protein. Is there a tool to create a new PDB, whose coordinates are taken from the holo structure but residue names and numbers are taken from the alo structure (by looking at the corresponding residues in the output of a sequence alignment program)? I thought about doing a script using clustalw for the alignment part, but the task seems not trivial. Thanks a lot, Francois.

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real space residuals
by Bradley Hintze 27 Sep '11

27 Sep '11

Hey phenix, I see a util for real space correlation. Real space residuals are slightly different. Is the a tool to calculate RSR in phenix? -- Bradley J. Hintze Duke University Graduate Student Department of Biochemistry

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map CC given a model and map coefficients
by Francis E Reyes 27 Sep '11

27 Sep '11

Hi all I'd like to compute a resid by resid and overall map CC between a set of coefficients I specify and a model. Any utils to get this to me quickly? phenix.model_vs_data doesn't seem to take in custom coefficients. Thanks! F --------------------------------------------- Francis E. Reyes M.Sc. 215 UCB University of Colorado at Boulder

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Pseudo-merohedral twinning refinement in C2, when beta = 94 degrees
by John Pak 22 Sep '11

22 Sep '11

Hi all, I currently have a dataset that scales well in C2. (a = 224,b = 129,c = 392. beta= 94.5 degrees). Previously, I had thought that these crystals were in P6322 (posted this a few months ago), but I've since grown better crystals, where the beta angle is now 94.5, and not close to 90.0. I'm reasonably confident with the scaling - however, it has always been really difficult to index these crystals in HKL2000. Like the previous crystals, this new C2 dataset looks like it might be perfectly twinned, based on Xtriage's L test. I've solved the structure by MR, and refined it to 3.0 angstroms to R=30%, Rfree=33%, but I am running out of things to fix. I'd like to perform twinning refinement, based on this Xtriage L test result. The problem is that Xtriage cannot find any pseudomerohedral twinning laws, likely because the beta angle is too far from 90 degrees?? For kicks and giggles, I started to enter arbitrary beta angles in Xtriage, and at a beta angle below 93.4, Xtriage can find two twinning laws (closer to 90 degrees, Xtriage can find 5 twin laws). Using "-1/2*h+3/2*k, 1/2*h+1/2*k, -l" in Phenix refine (the beta angle is still 94.5 degrees, I haven't changed this) results in the R and Rfree dropping a lot to 25.5 and 28.6, respectively. Used the same random seed as previous runs to generate the test set from the scalepack file, with the "use lattice symmetry to generate test set" flag enabled. The maps look a lot noisier. So my questions are: 1. Is this twinning refinement valid? I'm really thinking no - since the maps didn't improve. Suppose the maps didn't get worse though - would this twinning refinement then be valid? 2. How do I go about reindexing this dataset in I2? i.e. to see if the beta angle with this unit cell selection is closer to 90 degrees. Would this even help, with respect to pseudomerohedral twinning refinement? Thanks!

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Maps Bias
by Yuri 22 Sep '11

22 Sep '11

I was having a discussion with a friend about maps and model bias. Is the Fobs/PHImodel more biased than 2FOFCWT/PHI2FOFCWt? What about an omit region of these two? Thanks for any opinion on this -- Yuri Pompeu

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