July 2013 - phenixbb - phenix-online.org

ADP refinement of cysteinesulfonic acid
by Phillip Steindel 16 Jul '13

16 Jul '13

Hi all- I have a 1.5 Angstrom structure with two cysteines that appear to have oxidized to cysteinesulfonic acid (OCS). I replaced the cysteines in coot, then ran refine with individual and anisotropic ADPs, but the ADPs don't appear to be refining for those residues. The hydrogens are all at 24,and the non-hydrogens are all at 20. I'm running 1.8.2-1309. Thanks, Phillip Steindel Theobald Lab Brandeis University

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cis peptide question
by Edward A. Berry 16 Jul '13

16 Jul '13

I have a cis-peptide in my structure. Phenix recognizes it and .geo file shows this is restrained to 0*: dihedral pdb=" CA ALA A 401 " pdb=" C ALA A 401 " pdb=" N SER A 402 " pdb=" CA SER A 402 " ideal model delta harmonic sigma weight residual 0.00 -1.58 1.58 0 5.00e+00 4.00e-02 1.00e-01 However in statistics printed with the output pdb, I have at least one dihedral that is flagged as off by about 180*: REMARK 3 DEVIATIONS FROM IDEAL VALUES. REMARK 3 RMSD MAX COUNT REMARK 3 DIHEDRAL : 12.902 168.987 3277 ^^^^^^^ Could this be my cis peptide, or do I have a really bad dihedral somewhere else?

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How do I turn off sidechain rotamer fitting?
by Owen Pornillos 15 Jul '13

15 Jul '13

I'm using one of the nightlies - dev 1427. It's not doing very well in combination with NCS. Or what is the most recent nightly that does not have this feature? Many thanks, Owen

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Kicked difference maps
by Ho Leung Ng 13 Jul '13

13 Jul '13

Hi, I am finding that features in kicked difference maps (mFo-DFc) have very different scaling compared to the standard difference maps. For example, a blob that appears in the standard map at 3 sigma might not appear in the kicked map until 5.5 sigma. Is this correct functioning? In contrast, features in the kicked and standard 2mFo-DFc maps are comparable in scale. Thank you, Ho Ho Leung Ng University of Hawaii at Manoa Assistant Professor, Department of Chemistry hng(a)hawaii.edu

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problem with alternate conformations
by George Phillips 11 Jul '13

11 Jul '13

I am trying to adapt my old CNS scripts to to multiple conformer refinements in Phenix, i.e. up to 20 copies of each entire chain. I seem to be OK with up to three copies of the whole chain, but when I try four or more I seem to be in an infinite loop in the 'reduce' phase of a refinement. 3 copies runs in less than hour, even with torsion simulated annealing, with four even overnight the program just runs 'reduce for hours and hours'. This happens on the standard release and development version 1422. Is there some way to turn off hydrogens as a work around? Test files available on request. : ) Thanks for any help! George George N. Phillips, Jr. Ralph and Dorothy Looney Professor Department of Biochemistry and Cell Biology Rice University, MS140 6100 Main Street Houston, Texas 77005-1892 Office: +1 713.348.6951 http://www.bioc.rice.edu/

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2014 Gordon Research Conference and Research Seminars on Diffraction Methods in Structural Biology
by Anastassis Perrakis 11 Jul '13

11 Jul '13

Dear all, In a bit more than a year from now, we will be running the Gordon Research Conference on Diffraction Methods in Structural Biology, this time preceded for the first time by a two-day Gordon Research Seminar, exclusively for young scientists and a few mentors. http://www.grc.org/programs.aspx?year=2014&program=diffrac http://www.grc.org/programs.aspx?year=2014&program=grs_diff We are in the process of inviting the right people to make the schedule as exciting and inviting as possible, hoping we will be able to attract a diverse, enthusiastic, and motivated crowd! At this stage, we would like to ask you for ideas for 1. Specific subjects that are emerging and you would like to see covered, to make it worth your time to join us! 2. Specific people that would be excellent speakers, that would make you attend the Research Conference! 3. Specific people that would be great mentors, that would make you attend the Research Seminars! Many thanks from the team (but please send all replied to me!) Tassos Perrakis (GRC chair), Eddie Snell (GRC vice chair), Jeff Headd (GRS chair) and Maike Bublitz (GRS assoc. chair)

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parallel phenix.phaser on SGE cluster
by L. Costenaro (IBB) 11 Jul '13

11 Jul '13

Hello, I am trying to run phaser in a SGE cluster (qsub) using multiple proc (either phenix.phaser from the command line or phaser-MR from the GUI), but the jobs do not parallelize. When I run the phaser-MR locally (same executable) it does parallelize (multiple python threads). Any help , advice would be welcome. Best regards, Lionel

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Location of Gaussian factors for ED calculation
by Schubert, Carsten [JRDUS] 10 Jul '13

10 Jul '13

Hi, Were in the phenix package can I find the Gaussian factors (scattering table) for calculating the isotropic ED distribution at a given radius of r. I just need that for an illustration. Even better of you could already point me to some plots. Nothing I found online so far was suitable. Thanks Carsten

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: Post-doctoral position in structural biology (Paris, France)
by Benas Philippe 10 Jul '13

10 Jul '13

POST-DOCTORAL POSITION IN STRUCTURAL BIOLOGY (PARIS, FRANCE) . A postdoctoral position is available in the group of Dr. Carine Tisne at the Laboratory of Biological Crystallography and NMR of the University Paris Descartes, jointly with the group of Dr. Ciaran Condon at the Laboratory of Microbial Gene Expression (CNRS UPR9073) of the Institut de Biologie Physico-Chimique. We are studying the structure, function and folding of RNA and their complexes using NMR spectroscopy and X-ray crystallography, together with complementary biophysical methods. The postdoctoral research project focusses on the processing of the 5 and 3 ends of 5S rRNA in Gram-positive bacteria using solution NMR and X-ray crystallography as the main techniques. An integral part of our projects is the use and development of state-of-the-art preparative, biochemical and NMR techniques. . Interested candidates should hold a Ph.D. in Biochemistry, Biophysics or Structural Biology. Expertise in NMR spectroscopy and/or X-ray crystallography is mandatory. The successful candidate should be highly motivated, creative and capable of independent research in a two-team environment (10 minute walk between labs). The position is for a two-year term contract (one year in each team). We offer an exciting and enthusiastic work environment together with a stimulating location at the center of Paris (close to Jardin du Luxembourg). Facilities for structural biology include 600 MHz Bruker spectrometer equipped with cryoprobe. A new 700 MHz spectrometer will be installed in 2014. We also have access to high-field NMR spectrometers through the French TGIR and regular access to synchroton beamtime at either the ESRF or SOLEIL as Beam Time Allocation Group member. The ideal start date for the position would be October 2013. . Applications and informal queries about the labs and research projects should be directed by email to Carine Tisne (carine.tisne(a)parisdescartes.fr) or Ciaran Condon (condon(a)ibpc.fr[1]). Applications must include a letter of motivation summarizing current and future research interests, a CV, list of publications and letters of recommendation from at least two references. . ------------------------- PHILIPPE BENAS, PH.D. X-ray diffraction and computing facilities manager Laboratoire de Cristallographie et RMN Biologiques, UMR 8015 CNRS E-mails: philippe.benas(a)parisdescartes.fr, philippe_benas(a)yahoo.fr URLs: http://lcrbw.pharmacie.univ-paris5.fr/ , http://lcrbw.pharmacie.univ-paris5.fr/spip.php?article18 ------------------------- "We do know nothing ! But tomorrow is another day ! ;-) " Liens: ------ [1] mailto:[email protected]

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give-up-quick Phaser in Rosetta
by Morten Grøftehauge 10 Jul '13

10 Jul '13

Dear Phenixbb, I was wondering if there was any way of getting Rosetta to give up easily and move on to another search model? Say I have 20 or more equally awful search models. I think there's a possibility that one of them will knock it out of the park (i.e. TFZ > 8). But even if I have Phaser set to fast search I will end up with an exhaustive search because the search models are so bad. fast_search_mode= True Run phaser with selection_criteria_rot_value and then if no obvious solution, repeat with cutoff lowered by search_down_percent search_down_percent= 25 Used if fast_search_mode=True. Run phaser with selection_criteria_rot_value and then if no obvious solution, repeat with cutoff lowered by search_down_percent If I set search_down_percent to 75 does this mean that Phaser will give up easily and move on to the next model? Is this a terrible strategy CPU-time-wise? I am of course aware that search_down_percent is much more likely to give me the right solution for a given model but in this case there are just so many possible search models. Cheers, Morten -- Morten K Grøftehauge, PhD Pohl Group Durham University

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