March 2013 - phenixbb - phenix-online.org

labelit distl_minimum_number_spots_for_indexing
by Christian Roth 21 Sep '15

21 Sep '15

Dear Phenix-Team I installed the latest nightly build 1.8-1069. I tried to index some diffraction images and to overwrite the minimum usable spots for indesing I tried the suggested command. However If I try this command, it seems that it does not exist. At least in the list of the possible distl commands it does not show up. Do I have to install some additional stuff or change some preferences to get this command? Best Regards Christian

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Phenix version 1.8.2 released
by Paul Adams 26 Jun '13

26 Jun '13

The Phenix developers are pleased to announce that version 1.8.2 of Phenix is now available. Binary installers for Linux, Mac OSX, and Windows platforms are available at the download site: http://phenix-online.org/download/ Highlights from this version: Ensemble refinement, updated hydrogen parameters in refinement and validation, mmCIF reading and writing, LLG maps output from refinement, ligand pipeline for automated solution of protein/ligand complexes, autobuilding starting from a very accurate but very small part of a model, CC* calculation from unmerged data, maximum entropy maps, and PDB editor. Graphical interface: ==================== - New GUIs: phenix.merging_statistics, phenix.pdb_editor General: ======== - Multiple bug fixes - phenix.refine, phenix.reduce, and MolProbity updated to use consistent, revised, electron-cloud centers for hydrogen positions as default (for X-ray) - also see MolProbity website for details: http://molprobity.biochem.duke.edu - mmCIF format now supported in place of PDB format for input to many programs - new commands: phenix.ensemble_refinement, phenix.ligand_pipeline, phenix.sort_hetatms, phenix.cc_star, phenix.pdb_editor, phenix.maximum_entropy_map Refinement: =========== - phenix.refine - support for LLG map type - uses Phaser to compute residual anomalous LLG map - best when used with group_anomalous strategy, which will flatten the LLG map around existing anomalous scatterers with refined f'/f''. - alternatively, anomalous_residual map type (similar but less sensitive) - automatic linking in refinement and pdbtools for residues in the same chain - enabled with automatic_linking.intra_chain=True; this includes carbohydrate linking to protein and between sugars, and covalently bound ligands. - optional output of mmCIF format model and data files - phenix.ensemble_refinement (new command): - New method for refining ensemble models - Combines MD simulation with X-ray restraints that simultaneously account for anisotopic and anharmonic atomic distributions. - For full description see: Burnley BT, Afonine PV, Adams PD, Gros P. 2012. Modelling dynamics in protein crystal structures by ensemble refinement. eLife 1:e00311. doi: 10.7554/elife.00311. Experimental Phasing and Model Building: ======================================== - phenix.autobuild: - now uses torsion NCS parameterization when NCS is used in refinement - building starting from a very accurate but very small part of a model: You can now use the keyword rebuild_from_fragments=True to start rebuilding from fragments of a model. You might want to use this if you look for ideal helices using Phaser, then rebuild the resulting partial model, as in the Arcimboldo procedure. The special feature of finding helices is that they can be very accurately placed in some cases. This really helps the subsequent rebuilding. If you have enough computer time, then run it several or even many times with different values of i_ran_seed. Each time you'll get a slightly different result. - Base-pairing in RNA building -- phenix.autobuild will now try to guess which bases in a model are base-paired, and if there is no positive sequence match to the model, the bases that are base-paired will be chosen to be complementary. You can set the cutoff for base pairing with the keyword dist_cut_base. - waters are automatically named with the chain of the closest macromolecule if you set sort_hetatms=True. This is for the final model only. - you can supply a target position for your model with map_to_object=my_target.pdb. Then at the very end of the run your molecule will be placed as close to this as possible. The center of mass of the autobuild model will be superimposed on the center of mass of my_target.pdb using space group symmetry, taking any match closer than 15 A within 3 unit cells of the original position. The new file will be overall_best_mapped.pdb. Molecular Replacement: ====================== - phenix.mr_rosetta - You can now give commands for Rosetta in mr_rosetta, including a command to specify where disulfide bonds are located - The Rosetta models are now identified by an ID number so that they have unique names - Default number of homology models to download is now 1 (was 5) - Default number of NCS copies (if ncs_copies=Auto) is number leading to solvent content closest to 50%; if ncs_copies=None then all plausible values of ncs_copies are tested. New commands: ============= - phenix.ligand_pipeline (new command): - combines Xtriage, Phaser, eLBOW, phenix.refine, AutoBuild, and LigandFit to automatically solve protein/ligand complexes - optional integration with Coot (parameter interactive=True) allows semi-interactive operation where more rebuilding is required - phenix.cc_star (new command): - combined assessment of model and data quality, as outlined in Karplus & Diederichs (2012) Science 336:1030-3. - summary also output by phenix.model_vs_data if additional unmerged_data keyword is specified - phenix.maximum_entropy_map (new command): - tool to compute maximum entropy map from map coefficients. The program reads input Fourier map coefficients and modifies corresponding synthesis using Maximum-Entropy Method (MEM). The MEM modified map is everywhere positive, smooth and is of higher resolution. The method uses is a modification of Gull & Daniell (1978) algorithm. - phenix.sort_hetatms (new command): - rearranges heteroatoms (ligands, waters, etc.) in a model so they are paired with the nearest macromolecule chain, similar to the PDB's processing of models - phenix.pdb_editor (new command): - graphical editor for PDB files, based on tree view of model hierarchy - perform common operations such as chain renaming, renumbering, manipulation of atomic properties, add/remove atoms Ligands: ======== - phenix.ready_set: - methyl rotations now automatic when adding explicit hydrogens (also in phenix.reduce) - more options adding deuteriums to a model have been introduced Miscellaneous: ============== - phenix.xtriage: - include merging statistics if unmerged intensities are used as input - phenix.maps: - added wavelength parameter and support for anomalous residual and Phaser LLG map coefficients 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 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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links in phenix summary
by Christian Roth 03 Apr '13

03 Apr '13

Dear all, thanks to the phenix team which helped me a lot to resolve all issues regarding the correct link definitions. I have summarised a few things which one might consider if nonstandard links are necessary. Try phenix ready set to get your links out of the pdb. Do not forget to change the possible LINKR to LINK! Inspect the links and decide if they are useful! Peptide links are automatically incorporated if residues are close (inspect geo file) Non standard peptide links could be created using using an now available alpha release script: elbow.ligand_linking model.pdb Inspect the generated cif file and correct angles and incorporate dihedrals and so on if necessary. Sugar links which exists in the mon_lib.cif should be incorporated using the apply_cif link option like refinement.pdb_interpretation.apply_cif_link { data_link = ALPHA1-4 residue_selection_1 = chain B and resname GLC and resseq 1 residue_selection_2 = chain B and resname GLC and resseq 2 } According to the link definition the C1 oxygen of the following sugar with the higher number must be removed. The automatic incorporation of sugar links will be probably soon available in phenix. Nigel is already working on this. If one want use hydrogens in the refinement, they have to be added previously with ready_set and afterwards the OH4 sugar hydrogen has to be removed before the refinement. For links with symmetry related atoms the symmetry operator must be included in a custom bond definition efinement.geometry_restraints.edits { bond { action = *add delete change atom_selection_1 = chain A and resname HEM and resid 154 and name FE atom_selection_2 = chain A and resname MTO and resid 155 and name O symmetry_operation = -x,y,-z distance_ideal = 2.2 sigma = 0.01 } } The operator can be obtained using iotbx.show_distances your.pdb > all_distances Search for keyword "sym" or from Coot clicking on the symm option. Coot print out the operator and the translation term separately. Both has to be merged in the final operator used in phenix! Christian

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Fitting ligand using coot
by bsubedi＠btk.fi 31 Mar '13

31 Mar '13

Hi all, I tried to fit the ligand using the coot -> calculate-> other modeling tools-> Find ligands. I have imported cif to coot and also opened the pdb file of my ligand. However, coot do not identify the ligand and asks to adjust r.m.s.d. I can see the density for my ligand. Could anyone suggest me what could be the problem or if I am missing anything here. Best regards. Bishwa

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Re: [phenixbb] question about FFT map coefficients
by Michael Thompson 29 Mar '13

29 Mar '13

Hi Nat, The FFT didn't work out, but I'm not sure if it's due to negative Fs. When I set up the FFT map coefficients utility with my mtz file, after picking my input I get a warning that "The reflections file does not appear to contain any suitable map coefficients." Then if I try to run it anyway I get the error message "There are no map coefficients in this MTZ file." An mtz dump confirms that I have columns FP and SIGFP. Additional info: these Fs were generated using a python script that I wrote, and there are not meaningful values for SIGFP. My script simply wrote out 0.000 to the SIGFP column for each reflection essentially as a place holder. I thought that maybe 0 was not a valid entry for SIGFP so I changed it to 0.001 so there would be some value there, but I get all the same errors. Could this be the problem? Any suggestions? Thanks for the help. Sorry to bug you. Mike ----- Original Message ----- From: "Nathaniel Echols" <nechols(a)lbl.gov> To: "PHENIX user mailing list" <phenixbb(a)phenix-online.org> Sent: Thursday, March 28, 2013 3:42:31 PM GMT -08:00 US/Canada Pacific Subject: Re: [phenixbb] question about FFT map coefficients On Thu, Mar 28, 2013 at 3:28 PM, Michael Thompson <miket(a)chem.ucla.edu> wrote: > I have an mtz file with map coefficients that are essentially Fo-Fo for two data sets. I would like to generate a map using these coefficients, but because the subtraction of Fs has already been done, there are some values of FP that are negative. Is "FFT map coefficients" able to handle negative values for FP? My guess would be that the answer is yes, because internally the amplitudes and phases for map calculation are combined to form a single array of complex numbers, and this effectively converts the amplitudes to be all-positive. Also, if this were not the case, the isomorphous or anomalous difference maps would never work. But I haven't actually tried what you're wanting to do with real data - if the result isn't what you expect, let us know. -Nat _______________________________________________ phenixbb mailing list phenixbb(a)phenix-online.org http://phenix-online.org/mailman/listinfo/phenixbb -- Michael C. Thompson Graduate Student Biochemistry & Molecular Biology Division Department of Chemistry & Biochemistry University of California, Los Angeles miket(a)chem.ucla.edu

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question about FFT map coefficients
by Michael Thompson 28 Mar '13

28 Mar '13

Hello All, A quick question about the "FFT map coefficients" utility in the GUI: I have an mtz file with map coefficients that are essentially Fo-Fo for two data sets. I would like to generate a map using these coefficients, but because the subtraction of Fs has already been done, there are some values of FP that are negative. Is "FFT map coefficients" able to handle negative values for FP? If not, I can always change the sign of negative Fs and add 180 to the corresponding model phases, but I was hoping I could avoid this. Thanks in advance for the help! Mike P.S. I do know there is an Fo-Fo map option in phenix, but the origin of my map coefficients is more complicated than simply Fo-Fo, so I cannot use this option. -- Michael C. Thompson Graduate Student Biochemistry & Molecular Biology Division Department of Chemistry & Biochemistry University of California, Los Angeles miket(a)chem.ucla.edu

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suggested usage of qsub?
by Scott Classen 28 Mar '13

28 Mar '13

Hi all, We have a HPC cluster configured with TORQUE/MAUI. I see in the Phenix GUI that there is some sort of ability to queue jobs to run via qsub. I can't find any documentation on how to set this up. If I'm working at my office computer and I want to submit to a remote server cluster for refinement, is this possible? Or is it assumed that qsub is available on the local machine? Thanks, Scott

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fwd: Deadline for the CCP4 Summer School application is approaching
by Nathaniel Echols 26 Mar '13

26 Mar '13

> ---------- Forwarded message ---------- > From: "Ruslan Sanishvili (Nukri)" <nukri(a)aps.anl.gov> > To: phenixbb(a)phenix-online.org > Date: Tue, 26 Mar 2013 11:52:44 -0500 (CDT) > Subject: Deadline for the CCP4 Summer School application is approaching > Dear Colleagues, > > The deadline for applications for the 6th annual CCP4 Summer School “From data collection to structure refinement and beyond” is only ten days away. Please submit your applications before April 5, 2013. The school will take place from June 18 to June 26, 2013 at the Advanced Photon Source (APS) near Chicago. > > There is no registration fee for the school. The students will be responsible for their own travel and lodging expenses. These and other details (the program, the list of speakers, the application process, accommodations, site access, contacts etc) can be found at the workshop website at http://www.ccp4.ac.uk/schools/APS-2013/index.php > > The school will include data collection, processing, structure solution, model building, refinement, validation, automation of many steps etc. Participants are encouraged to bring their own crystals, raw data or processed data for hands-on problem solving under the guidance of software developers and other experts. > We hope to see you in June > > Garib, Ronan and Nukri > > > > Ruslan Sanishvili (Nukri) > Macromolecular Crystallographer > GM/CA@APS > X-ray Science Division, ANL > 9700 S. Cass Ave. > Argonne, IL 60439 > > Tel: (630)252-0665 > Fax: (630)252-0667 > rsanishvili(a)anl.gov > >

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low-res. real-space refinement
by "Weiergräber, Oliver H." 26 Mar '13

26 Mar '13

Hello, when refining a protein structure against a low-resolution dataset (5 A), I wanted to also attempt real-space refinement. However, in the log file I find: |-real space refinement (target=simple)---------------------------------------| rejected... | | | --------------------------------------------------------------------------- | Changing the target to, e.g., diff_map does not change anything; the message will still refer to the "simple" target. I guess this is due to an internal resolution limit, but that's only speculation since it seems to be undocumented. Indeed, there is probably not much to be gained by real-space refinement at this resolution (at least not in terms of side-chain conformations), but I wanted to give it a try anyway. Any comments on this issue? Regards, Oliver ================================================ PD Dr. Oliver H. Weiergräber Institute of Complex Systems ICS-6: Structural Biochemistry Tel.: +49 2461 61-2028 Fax: +49 2461 61-9540 ================================================ ------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------ Forschungszentrum Juelich GmbH 52425 Juelich Sitz der Gesellschaft: Juelich Eingetragen im Handelsregister des Amtsgerichts Dueren Nr. HR B 3498 Vorsitzender des Aufsichtsrats: MinDir Dr. Karl Eugen Huthmacher Geschaeftsfuehrung: Prof. Dr. Achim Bachem (Vorsitzender), Karsten Beneke (stellv. Vorsitzender), Prof. Dr.-Ing. Harald Bolt, Prof. Dr. Sebastian M. Schmidt ------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------

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Drag drop files
by Colin Levy 25 Mar '13

25 Mar '13

Hi all, I am running 1.8.2-1309 under OSX 10.7.5 but I lost the ability to drag and drop files between various phenix windows. Anyone else experiencing this or is it something specific to my setup? Thanks, Colin Manchester Protein Structure Facility MIB 1.025 Tel 0161 306 5185 c.levy(a)manchester.ac.uk<mailto:[email protected]>

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