March 2011 - phenixbb - phenix-online.org

free R test or work set flag value
by Bryan Lepore 25 Mar '11

25 Mar '11

[ dev-705 ] i see: Test (R-free flags) flag value: 1 is the work set the negation? -Bryan

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Postdoctoral position in Grenoble, France - Living deep
by Eric Girard 25 Mar '11

25 Mar '11

*Living deep: Structural basis of piezophilic adaptation* ELMA group. Institut de Biologie Structurale J.-P. Ebel -- Grenoble -- France http://www.ibs.fr/groupes/groupe-extremophiles-et-grands/ We are recruiting a post-doctoral scientist interested in life adaptation to extreme conditions. The position is for 2 years and is funded by the french national agency for research (ANR) A high-pressure environment characterizes our planet. For more than 60 % of the biosphere pressure is greater than 100 bars and it can reach 1000 bars in the deepest sea trenches, like the Marianna's trench. However, in these extreme conditions, a vast biodiversity of adapted micro-organisms (piezophiles) can be encountered. So far, the molecular mechanisms that facilitate proteins function under high pressure remain obscurs. Beside interests to understand fundamental protein folding processes and life evolution, this information is essential to develop biotechnological application from deep sea enzymes. This work will be performed in the framework of a collaborative network including ENS Lyon and IFREMER-UBO in Brest in which a new archaeon from the Pyroccoccus phylum was recently discovered and was called Pyrococcus yayanosii CH1. This microbe is the first obligate piezophile as it is only able to grow under pressure (optimal growth: 98°C and 520 bars). The project is based on the study of two protein families, for which the biochemistry is well handled by the team: large peptidases complexes and lactate/malate dehydrogenase (LDH/MalDH). These proteins play key roles in metabolic adaptation to deep sea ecosystem and allow combining structural approaches (protein crystallography, small-angle scattering...) and biochemical approaches (oligomer stability, enzymatic activity measurements...). The candidate will study the molecular effects of high pressure/temperature by comparing the structural and functional properties of different proteases and LDH/MalDH from Thermococcus and Pyrococcus phylums (including Pyrococcus yayanossi CH1) isolated at various water depths. The ELMA team possesses a fully-fledged wet laboratory for all biochemical steps and the project will benefit from privileged access to large facilities (synchrotron and neutron sources) as well as from latest developments in high-pressure biophysics: high-pressure protein crystallography, for which the ELMA team is a world leader, small-angle x-ray scattering under high-pressure, UV-Visible spectrophotometer and fluorimeter both equipped with a high-pressure vessel. The candidate should have a background in biochemistry with a strong interest in structural approaches or a physico-chemistry background with a strong interest for biophysics. Candidatures, including CV, intention letter and the names and contact information of referees, as well as informal inquiries should be sent to Eric Girard (eric.girard at ibs.fr) and Bruno Franzetti (bruno.franzetti at ibs.fr). Relevant publications from the team: Coquelle et al (2007) Activity, stability and structural studies of lactate dehydrogenases adapted to extreme thermal environments. J Mol Biol 374: 547-562. Dura et al (2009) The structural and biochemical characterizations of a novel TET peptidase complex from Pyrococcus horikoshii reveal an integrated peptide degradation system in hyperthermophilic Archaea. Mol Microbiol 72: 26-40. Girard et al. (2011). Structure-function perturbation and dissociation of tetrameric urate oxidase by high-hydrostatic pressure. Biophys J 98: 2365-2373. -- *************************************************************** Eric Girard Extremophiles and Large Macromolecular Assemblies (ELMA) group Institut de Biologie Structurale J.-P. Ebel UMR 5075 CEA-CNRS-UJF-PSB 41, Rue Jules Horowitz 38027 Grenoble Cedex 1, France Web site:http://www.ibs.fr/ ***************************************************************

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fwd: Reminder: Fourth annual CCP4 summer school in USA, at APS, June 7-15
by Nathaniel Echols 24 Mar '11

24 Mar '11

---------- Forwarded message ---------- From: "Sanishvili, Ruslan" <rsanishvili(a)anl.gov> Date: Thu, 24 Mar 2011 16:35:22 -0500 Subject: Reminder: Fourth annual CCP4 summer school in USA, at APS, June 7-15 Dear Colleagues, This is a reminder that the deadline for applications for the 4th annual CCP4 summer school “From data collection to structure refinement and beyond” is April 8. The school will take place June 7-15, 2011 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-2011/ 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. Garib, Ronan and Nukri Ruslan Sanishvili (Nukri), Ph.D. GM/CA-CAT Biosciences 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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local B-factors
by Priit Eek 24 Mar '11

24 Mar '11

Hi, Talking about B-factors... Being a novice crystallographer I came to a problem: what's the best tool to calculate the average B-factor of a specified region (a domain) in the model, to describe the mobility of chains (or disorder in the crystal) in that region? Regards, Priit

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Multiprocessors/parallel runs keywords
by Jendrek 24 Mar '11

24 Mar '11

Hi, I'm trying to get a grip on what seems to be a multitude of options for running Phenix in multiprocessor/parallel mode. Some of the options/keywords are obvious and easy to find in documentation but other elude me and the posts on the phenixbb make the whole issue even more complicated. So, here is my humble request: Dear Phenix Developers could you please prepare a short summary containing the info concerning running Phenix in multiprocessor/parallel environment for both stable and self compiled developer versions? Even a table with required keywords per program would be a great help... Best regards, Andrzej Lyskowski -- Dr. Andrzej Lyskowski (andrzej[.]lyskowski[(a)]acib[.]at) ACIB Austrian Centre of Industrial Biotechnology GmbH Petersgasse 14, A-8010 Graz, Austria http://acib.at/ c/o IMB Institute of Molecular Biosciences, University of Graz Humboldtstraße 50,III/194, A-8010 Graz, Austria http://strubi.uni-graz.at/ +43 316 380 1993 tel +43 316 380 9897 fax

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weird B factor refinement
by Sebastiano Pasqualato 24 Mar '11

24 Mar '11

Hi all, I am refining a structure and have turned on TLS refinement. Since I have done this, I see a weird behavior in some sulphur atom's B factor, and their near atoms. I paste below an example. Has anybody else seen this? Looks like a bug... Thanks a lot in advance, ciao, s ATOM 655 N PHE A 82 66.343 -40.145 -6.536 1.00 25.85 N ANISOU 655 N PHE A 82 3247 3386 3190 162 103 157 N ATOM 656 CA PHE A 82 65.631 -38.890 -6.206 1.00 23.86 C ANISOU 656 CA PHE A 82 2967 3126 2971 192 102 153 C ATOM 657 C PHE A 82 64.134 -39.032 -6.460 1.00 27.82 C ANISOU 657 C PHE A 82 3494 3640 3436 176 116 173 C ATOM 658 O PHE A 82 63.709 -39.388 -7.568 1.00 46.67 O ANISOU 658 O PHE A 82 5852 6065 5815 251 147 222 O ATOM 659 CB PHE A 82 66.174 -37.668 -6.970 1.00 14.67 C ANISOU 659 CB PHE A 82 1831 1971 1772 176 119 175 C ATOM 660 CG PHE A 82 65.501 -36.397 -6.574 1.00 25.83 C ANISOU 660 CG PHE A 82 3217 3375 3223 210 117 169 C ATOM 661 CD1 PHE A 82 64.399 -35.932 -7.285 1.00 19.12 C ANISOU 661 CD1 PHE A 82 2363 2528 2371 221 125 179 C ATOM 662 CD2 PHE A 82 65.919 -35.707 -5.429 1.00 37.72 C ANISOU 662 CD2 PHE A 82 4725 4876 4732 206 117 168 C ATOM 663 CE1 PHE A 82 63.734 -34.784 -6.874 1.00 23.74 C ANISOU 663 CE1 PHE A 82 2979 3122 2919 200 145 205 C ATOM 664 CE2 PHE A 82 65.275 -34.544 -5.018 1.00 34.01 C ANISOU 664 CE2 PHE A 82 4257 4438 4226 262 171 240 C ATOM 665 CZ PHE A 82 64.176 -34.080 -5.744 1.00 33.79 C ANISOU 665 CZ PHE A 82 4254 4389 4196 197 145 203 C ATOM 666 N CYS A 83 63.337 -38.791 -5.425 1.00 35.53 N ANISOU 666 N CYS A 83 4471 4615 4413 176 117 175 N ATOM 667 CA CYS A 83 61.879 -38.960 -5.524 1.00 55.90 C ANISOU 667 CA CYS A 83 7050 7200 6991 181 121 181 C ATOM 668 C CYS A 83 61.332 -37.537 -5.259 1.00 48.88 C ANISOU 668 C CYS A 83 6132 6340 6100 265 163 240 C ATOM 669 O CYS A 83 61.949 -36.777 -4.512 1.00 50.54 O ANISOU 669 O CYS A 83 6344 6544 6313 262 165 239 O ATOM 670 CB CYS A 83 61.343 -40.122 -4.596 1.00 2.87 C ANISOU 670 CB CYS A 83 332 481 275 174 114 172 C ATOM 671 SG CYS A 83 61.739 -41.776 -5.153 1.00212.79 S ANISOU 671 SG CYS A 83 26919 27069 26861 166 105 162 S ATOM 672 N ASP A 84 60.251 -37.131 -5.925 1.00 46.73 N ANISOU 672 N ASP A 84 5887 6042 5827 199 138 202 N ATOM 673 CA ASP A 84 59.894 -35.684 -6.003 1.00 53.97 C ANISOU 673 CA ASP A 84 6774 6990 6743 291 187 268 C ATOM 674 C ASP A 84 59.468 -34.966 -4.713 1.00 54.16 C ANISOU 674 C ASP A 84 6797 6968 6812 239 140 198 C ATOM 675 O ASP A 84 59.898 -33.835 -4.448 1.00 54.40 O ANISOU 675 O ASP A 84 6861 7005 6804 211 158 221 O ATOM 676 CB ASP A 84 58.829 -35.479 -7.062 1.00 52.17 C ANISOU 676 CB ASP A 84 6574 6736 6511 218 157 225 C ATOM 677 CG ASP A 84 59.320 -35.845 -8.416 1.00 59.41 C ANISOU 677 CG ASP A 84 7456 7647 7469 252 143 207 C ATOM 678 OD1 ASP A 84 60.375 -35.284 -8.783 1.00 61.87 O ANISOU 678 OD1 ASP A 84 7770 7956 7782 252 144 207 O ATOM 679 OD2 ASP A 84 58.683 -36.697 -9.087 1.00 57.64 O ANISOU 679 OD2 ASP A 84 7230 7428 7243 253 141 207 O -- Sebastiano Pasqualato, PhD Crystallography Unit IFOM-IEO Campus Cogentech - Consortium for Genomic Technologies via Adamello, 16 20139 - Milano Italy tel +39 02 9437 5172 fax +39 02 9437 5990

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B factor statistics
by Yuri 24 Mar '11

24 Mar '11

Hello phenixers, I am putting together a crystallography table for my model, what is the best way to find the average B factors. Are they broken down by main chain, side chain and HOH? thank you -- Yuri Pompeu

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reference model
by Kendall Nettles 24 Mar '11

24 Mar '11

Dear PHENIX developers, I would like to use a reference model in refinement, but the structure has two components with known higher resolution structures. Can I specify two reference models? How? I'm also having trouble with the syntax. With the following params file, the run fails saying that reference model is an unused parameter. Lastly, what does "reference_xray_structure" do? Thanks! Kendall refinement.main { reference_model_restraints = True } refinement.refine { strategy = *individual_sites \ rigid_body \ individual_sites_real_space \ *individual_adp \ group_adp \ tls \ occupancies \ group_anomalous \ none } reference_model { file = 4.pdb }

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Re: [phenixbb] rotamers
by Phoebe Rice 24 Mar '11

24 Mar '11

I'm moderately in favor of the "just let B go through the roof" option. Here's why: Most "user friendly" programs like pymol have an option to color the atoms by B but not by occupancy. Most end-users I interact with know enough to see if coloring by B makes a side chain flaming red, but they'd never think (or know how) to check occupancy. (So if you do set occ to zero, please set B to the max!) And truncating side chains screws up simple electrostatics calculations, which matters if you deal with nucleic acid-binding proteins. Phoebe ===================================== Phoebe A. Rice Dept. of Biochemistry & Molecular Biology The University of Chicago phone 773 834 1723 http://bmb.bsd.uchicago.edu/Faculty_and_Research/01_Faculty/01_Faculty_Alph… http://www.rsc.org/shop/books/2008/9780854042722.asp

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pdb editor after autobuild
by Jason 23 Mar '11

23 Mar '11

Hi, I have a pdb file obtained from autobuild. However, some of the sidechains are missing. Is there an easy way to detect which sidechains are missing? The reason I am asking is my pdb file is huge. It takes a lot of effort to go through one reside by one residue. Thanks. -- ====================== Jason Structural Biology Department University of Pittsburgh ======================

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