- phenixbb - phenix-online.org

Ignoring SegIDs
by Stephen Graham 10 Apr '08

10 Apr '08

Hi all, Apologies if this is a dumb question, but... Is there a way to get phenix.refine to ignore segids? I ask because COOT seems to be blithely unaware of segids and they have a habit of disappearing when one is rebuilding a model, resulting in very odd geometries when the side chain of a residue is in segment ' ' and the main chain is in segment 'A'. Alternatively, is there a 'convert chain IDs to segids' option like in CNS? Basically, I would like the segids removed/fixed/ignored automagically at the start of refinement (since I never use them for anything useful anyway). Thanks, Stephen -- Dr Stephen Graham Nuffield Medical Fellow Division of Structural Biology Wellcome Trust Centre for Human Genetics Roosevelt Drive Oxford OX3 7BN United Kingdom Phone: +44 1865 287 549

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phenix-cns conversion
by Sean Johnson 08 Apr '08

08 Apr '08

What is the best way to convert phases obtained from phenix to a usable cns format? I have 3.6 A maps that were SAD phased and density modified using phenix. I now want to use some of the cns refinement options - like torsion angle refinement. I tried converting structure factors and HL coefficients to cns format using phenix.reflection_file_converter, but when I run cns input files, I start getting errors like the ones shown below (this is from density_modify.inp): _____ Program version= 1.2 File version= 1.2 %XMAPASU-AUTOmem: increasing memory allocation to 2000000 Minimum brick that covers asymmetric unit: A= 0,..., 150 B= 0,..., 150 C= 0,..., 36 Sum of 21042 elements = 21042.0000 SHOW: average of 810150 elements= 0.0000 ANOMalous=FALSe {OFF} XMPST: average = 0.0000 minimum = 0.0000 maximum = 0.0000 XMPST: r.m.s. = 0.0000 norm = 0.0000 XMHISTO: (default from map) RHOMIN and RHOMAX = 0.0000 0.0000 %XMHISTO-ERR: a complete flat map. XMHISTO: (default from map) SLOT width = 0.000000 %XMHISTO-ERR: the SLOT width is too small 0.00000 XMHISTO: the number of slots MBINS=10000 and width SLOT= 0.0000 %XDOTYPE-ERR: Variable/type mismatch: do (masksol=1) (real(automap) <= $cutoff) ^ %DO-ERR: Data type mismatch. Selection must be a logical expression.: do (masksol=1) (real(automap) <= $cutoff) ^ %SHOW error encountered: There were errors in DO expression. (CNS is in mode: SET ABORT=NORMal END) ***************************************************** ABORT mode will terminate program execution. ***************************************************** Program will stop immediately. ______ I'm guessing that the problem has to do with the way I am converting the data to cns (since I have beautiful maps from phenix), but I'm really stuck right now. Any guidance would be appreciated. Thanks, Sean Johnson -- Sean Johnson, PhD R. Gaurth Hansen Assistant Professor Utah State University Department of Chemistry and Biochemistry 0300 Old Main Hill Logan, UT 84322-0300 (435) 797-2089 (435) 797-3390 (fax) sean.johnson(a)usu.edu

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ICSG 2008 Oxford Sept. 20-24, 2008
by Tom Terwilliger 07 Apr '08

07 Apr '08

Dear PHENIX users, I would like to encourage you to attend the 5th International Conference on Structural Genomics Sept 20-24th! This is the principal conference on structural genomics; it occurs every 2 years in a different part of the world. This year's meeting is in Oxford, UK and will have a lot of methods talks in addition to structural biology results. You can register at http://www.spine2.eu/ISGO . I'll look forward to seeing you in Oxford in September! All the best, Tom T The 5th International Conference on Structural Genomics (ICSG 2008) will be held in Oxford, UK on September 20-24th. The biennial Conference is the premier meeting for the Structural Genomics scientific community world-wide and is hosted on behalf of the International Structural Genomics Organization (ISGO) by Professor David Stuart at the University of Oxford, Division of Structural Biology. The Scientific Program will contain main scientific sessions, poster sessions, breakout discussion groups for specific topics and a social program and we expect to attract a worldwide audience of 500 delegates. Provisional Session Topics - Structural genomics, systems biology and complexes - The impact of structural genomics on treating diseases - Maximising impact on and integration with biology - HTP methods for membrane proteins - Hybrid/multidisciplinary approaches - Strategies for intrinsically unfolded proteins - Should we expand the protein universe or concentrate on biology? - New technologies The venue will be in the UK at the University of Oxford Examination Schools, High Street, Oxford. The Schools are in the heart of Oxford, central to all colleges, the main Oxford cultural and shopping areas and close to hotel and college accommodation. Registration and abstract submission is now available. Early registration and abstract submission deadline: 31st July 2008 http://www.spine2.eu/ISGO Social program reservations closing date: August 31st Thomas C. Terwilliger Mail Stop M888 Los Alamos National Laboratory Los Alamos, NM 87545 Tel: 505-667-0072 email: terwilliger(a)LANL.gov Fax: 505-665-3024 SOLVE web site: http://solve.lanl.gov PHENIX web site: http:www.phenix-online.org ISFI Integrated Center for Structure and Function Innovation web site: http://techcenter.mbi.ucla.edu TB Structural Genomics Consortium web site: http://www.doe-mbi.ucla.edu/TB

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"unlimit" command with Phenix GUI -unlimit: descriptors: Can't remove limit (Invalid argument)
by hari jayaram 03 Apr '08

03 Apr '08

Hi I am giving new to Phenix and the Phenix GUI. For starters I am trying to run the prime and switch strategy in Phenix. I know all my inputs are fine (see below) but the program aborts ( GUI turns red ) after a few seconds. I checked the resolve.com file in the directory and it has a command "unlimit" which in Leopard causes the following output to be echoed to the stdout "unlimit: descriptors: Can't remove limit (Invalid argument)" Once I deleted the unlimit command I can run the script just fine from a shell. My question is how can I tweak the Phenix GUI so that I dont have to run everything from the shell by manually editing the resolve.com file. The script that stops the GUI is reproduced here. Thanks for your help Hari Jayaram Postdoc , Brandeis University script: #!/bin/csh setenv SOLVEDIR /usr/local/phenix-1.3b-rc6/solve_resolve/ext_ref_files setenv SOLVEBIN /usr/local/phenix-1.3b-rc6/build/mac-intel-osx/solve_resolve/exe # setenv CCP4_OPEN UNKNOWN setenv SYMOP $SOLVEDIR/symop.lib unlimit # $SOLVEBIN/resolve<<EOF access_file mirima.dat labin FP=F_s3-3 FC=FC PHIC=PHIC FOM=FOM FWT=FWT hklin resolve_input.mtz mask_cycles 5 minor_cycles 10 hklout testpms-resolve.mtz no_build prime_and_switch EOF unlimit returns------------> [mango:hj/s3-3/prime_switch] hari% unlimit unlimit: descriptors: Can't remove limit (Invalid argument)

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Crystallographic Postdoctoral Research Position - Berkeley, USA
by Paul Adams 02 Apr '08

02 Apr '08

A postdoctoral research position is available immediately to work on challenging problems in structural biology: Postdoctoral Researcher Job ID: 21615 Division: Physical Biosciences Date Opened: 3/28/2008 This postdoctoral position will study the structure and function of macromolecular complexes and enzymes using X-ray crystallographic methods. This position will be joint between the Center for Protein Folding Machinery (proteinfoldingcenter.org) and the Joint BioEnergy Institute (www.jbei.org). The biological systems to be studied will include: Type-II chaperonins responsible for the refolding of unfolded proteins in archeal and mammalian cells, Glycosyl transferases responsible for the synthesis of hemicellulose in plants, and Novel glycosyl hydrolases that are able to breakdown cellulosic material for biofuels production. The candidate will have experience with using crystallographic methods to study macromolecules; robotic hardware for performing crystallization trials and imaging trays are available. Crystals will be characterized and data collected using the beamline resources of the Berkeley Center for Structural Biology at the Advanced Light Source. Essential: Primary duties and responsibilities will include using robotic hardware to perform screens for crystallization conditions. Optimization of crystallization conditions. Biophysical characterization of protein samples using standard techniques, such as dynamic light scattering. Characterization of crystals using the Berkeley Center for Structural Biology beamlines at the Advanced Light Source. Collection and analysis of diffraction data, model building and structure refinement. Extensive email and verbal interaction with other researchers. Marginal: Use of small angle X-ray scattering methods to analyze macromolecular complexes in solution. Essential: Ph.D. or equivalent in a scientific discipline, preferably structural biology, biology, or chemistry. Demonstrated experience of scientific research using crystallographic methods. Experience with crystallization methods. Solid interpersonal skills and the ability to work in a team environment are critical. Ability to communicate with a broad range of researchers. Marginal: Experience with the use of small angle scattering methods. Familiarity with robotic hardware for crystal growth. NOTE: This is a one year Term appointment with the possibility of renewal under the same terms and conditions, contingent upon continued funding and availability of work. Lawrence Berkeley National Laboratory is a world leader in science and engineering research, with 11 Nobel Prize recipients over the past 75 years, and 59 present members of the National Academy of Sciences. LBNL conducts unclassified research across a wide range of scientific disciplines and hosts four national user facilities. AA/ EEO employer committed to the development of a safe and diverse workforce. Learn more at http://www.lbl.gov. For more information about the Center for Protein Folding Machinery visit: http://proteinfoldingcenter.org/ and the Joint BioEnergy Institute visit: http://www.jbei.org/. For more information about the Berkeley Center for Structural Biology visit: http://bcsb.lbl.gov/ To apply: visit http://cjo.lbl.gov/ and search for the job number 21615. Please see http://cjo.lbl.gov/app_instr.html for details of how to apply. -- Paul Adams Deputy Division Director, Physical Biosciences Division, 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 Building 64, Room 248 Tel: 510-486-4225, Fax: 510-486-5909 http://cci.lbl.gov/paul Lawrence Berkeley Laboratory 1 Cyclotron Road BLDG 64R0121 Berkeley, CA 94720, USA. --

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TLS, B factors, phenix and refmac
by Mischa Machius 01 Apr '08

01 Apr '08

Hi - Prompted by the recent discussions on B values, TLS refinement and differences between Phenix and refmac, we looked into these matters in more detail. We found that the crux of the problem lies in the fact that TLS and B value refinements are usually decoupled. We have developed a formalism that rolls both TLS and B value refinement into one. Phenix and refmac were modified to carry out the calculations, and the outputs from both programs were made compatible to allow proper comparison of the results. We found that the stability of the refinements is now vastly improved. More importantly, however, due to the reduced number of parameters, these calculations can be carried out to resolutions of 7 Å with meaningful representations of indiviual, anisotropic atomic displacement parameters. This low-resolution limit required reformulating the calculation of Wilson B values, but that is only a minor aspect of our treatment that can be neglected. The new, combined procedure for the simultaneous refinement of TLS/B is called 'TBS' refinement, reflecting all required components: Translation, Bibation, Screw. Interestingly, the ‘T’ component is fairly insensitive to input parameters, whereas the overall quality of the refinement is greatly dependent on the ‘B’ component. The more emphasis is put on ‘B’, the more convincing the results. There is a limit, though. At very high levels of ‘B’, the so-called ‘bibacity limit’, the refinement becomes very unstable, leading to inversion in severe cases. Seasoned crystallographers familiar with the concepts can successfully push the procedure to quite high 'B limits', whereas less experienced practitioners should follow the protocols very carefully. Please contact us for any details. Best - MM -------------------------------------------------------------------------------- Mischa Machius, PhD Associate Professor UT Southwestern Medical Center at Dallas 5323 Harry Hines Blvd.; ND10.214A Dallas, TX 75390-8816; U.S.A. Tel: +1 214 645 6381 Fax: +1 214 645 6353

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Question about anisotropic refinement of selected waters during automatic solvent update
by Schubert, Carsten [PRDUS] 01 Apr '08

01 Apr '08

Hi, I am trying to refine a couple of waters in a structure anisotropically in the latest version of CCI-Apps (Feb-08) . The selection is: refine.adp.anisotropic = "chain W and (resid 25 or resid 54)" The refinement works fine if "main.ordered_solvent = False". When I enable "main.ordered_solvent" the refinement fails with: "Sorry: Bad (empty or mixed) selection in adp_individual.aniso" during the first update of the solvent in macrocycle 1. A workaround is easy to implement, but I think this kind of scheme should work. Although it has all kinds of tricky implication for the downstream handling of the selection if the residues/waters in questions are deleted.... Cheers, Carsten

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gnomebreakpad error
by shivesh kumar 01 Apr '08

01 Apr '08

Dear all, We are trying to install phenix in Fedora Core 8.While installing it is showing the following error- Gtk-Message: Failed to load module "gnomebreakpad": libgnomebreakpad.so: cannot open shared object file: No such file or directory Please suggest what is wrong or missing. Thanx in advance. Shivesh

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tls definitions
by PhilEvans 01 Apr '08

01 Apr '08

Sorry if this has been answered before, but I've only just joined this BB In phenix.refine, I'm trying to make TLS groups consisting of multiple chains, eg refinement.refine { strategy=individual_sites+tls+individual_adp adp { tls="chain A and chain B and chain Z" tls="chain C and chain D and chain Y" } } but it doesn't work: what should I do? Phil ================== Extract refinement strategy and selections ================= individual_sites = True rigid_body = False individual_adp = True group_adp = False tls = True individual_occupancies = False group_occupancies = False group_anomalous = False size = 1356 n_use = 1356 n_use_u_iso = 1356 n_use_u_aniso = 0 n_grad_site = 0 n_grad_u_iso = 0 n_grad_u_aniso = 0 n_grad_occupancy = 0 n_grad_fp = 0 n_grad_fdp = 0 n_anisotropic_flag = 0 total number of scatterers = 1356 Sorry: Empty selection in adp_tls selection.

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question about refinement in a SAD data set
by Pascal EGEA 31 Mar '08

31 Mar '08

Dear All, I am trying to refine a seleno met structures at 2.2 Ang resolution I used Auto_Sol and Auto_Build and it worked great since it found the 4 semets with occupancies of about 0.85 to 0.95. and most of the model was built. Phenix generated an exptl_fp_phases.mtz with the Rfree flag. so far so good. I have a couple of questions because I am not quite to understand what phenix.refine is doing at this stage? 1- If I refine using the experimental phases mtz file generated by the auto_sol run, the occupancies for the seleniums change quite a bit and they drop to 0.75-0.80 and that does not sound right to me? What am I doing wrong? should I fix occupancies for the seleniums to the values evaluated at the end of the auto_build run (Rfree=27/ Rfac=24?) 2- This experimental phases mtz file contains FP and the HL coefficients for the phases but there are no more anomalous differences. If I try to refine f' and f" using it, Phenix tells me that there is no anomalous information contained in this file. So how do you refine f' and f"? and what is the practical reason for this AutoSol generated mtz file to not contain the anomalous differences that were used to locate the seleniums. Thanks in advance for the explanation Pascal F. Egea, PhD Post Doctoral Researcher University of California San Francisco Department of Biophysics and Biochemistry Robert Stroud Laboratory pascal(a)msg.ucsf.edu

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