- phenixbb - phenix-online.org

Improved refinement method for low resolution data
by Florian Nachon 14 May '10

14 May '10

Hi all, Axel Brunger just published a paper in Nature (http://www.nature.com/nature/journal/v464/n7292/abs/nature08892.html) about a new method to improve models despite low-resolution data. It is implemented in CNS 1.3. It might be a bit early, but is there any plan to implement that method in phenix? Florian.

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where do phenix.metal_coordination ideal bond lengths come from?
by Scott Classen 14 May '10

14 May '10

Hello, I have a structure with several water/carboxylate-coordinated metal ions and I am using phenix.metal_coordination to generate the restraints parameter file for phenix.refine. Can someone please tell me where phenix.metal_coordination is getting the ideal bond length/angle values from. Thanks, Scott Classen

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Gordon Conference on Diffraction Methods
by A Leslie 14 May '10

14 May '10

Just a reminder that there is still time to register for the Gordon Conference on Diffraction Methods in Structural Biology, that will be held at Bates College in Lewiston, Maine from 18-23rd July. The program (see below) covers all aspects of macromolecular crystallography, from crystallization to structure solution and refinement, and includes sessions on complementary techniques and the potential of free electron lasers. Many of the leading methods developers will be present and the format of the meeting, with free afternoons, provides ample opportunities for informal discussions. Further details, including a full program and details on the application procedure can be obtained from: http://www.grc.org/programs.aspx?year=2010&program=diffrac We hope to see you there ! Andrew Leslie (Chair) & Ana Gonzalez (Vice Chair) Outline Program: Sunday pm: Macromolecular Structures, Pushing the boundaries Discussion leader: Michael Rossmann 1. ABC Transporters: Doug Rees 2. The Spliceosome : Kyoshi Nagai Monday am: Crystallisation and the diffraction experiment Discussion leader: Zbyszek Dauter 1. Nanolitre crystallisation: Seth Harris 2. Twinning and disorder: Todd Yeates 3. Simulating the diffraction experiment: James Holton 4. Microcrystallography: Gwyndaf Evans Monday pm: Radiation damage and data collection strategies Discussion leader: Vivian Stojanoff 1. Radiation damage, experimental: Elspeth Garman 2. Microbeams: Yanhui Zou 3. Testing data collection strategies with the Pilatus: Marcus Mueller Tues am: Synchrotron developments and automated data processing Discussion leader: Thomas Schneider 1. Synchrotrons, latest developments: Sean Mc Sweeney 2. Synchrotrons, latest developments: Janet Smith 3. Data processing with Xia2/CHEF: Graeme Winter 4. Data processing with AUTOPROC: Clemens Vonrhein Tues pm: Complementary techniques Discussion leader: Ana Gonzales 1. Electron tomography: Sriram Subramaniam 2. SAXS: Hiro Tsuruta 3. Spectroscopy: Carrie Wilmot Weds am: Structure solution and refinement Discussion leader: Paul Adams 1. SAD Phasing: Randy Read 2. Molecular replacement with BALBES: Garib Murshudov 3. PHENIX: Tom Terwilliger 4. TLS: Ethan Merritt Weds pm: Challenging problems/Membrane Proteins Discussion leader: TBC 1. Using cubic lipidic phase: Martin Caffrey 2. Membrane Proteins: Stephen White 3. The Bacterial Ribosome: Venki Ramakrishnan Thurs am: Selected Posters and Map improvement and Model building Discussion leader: Tassos Perrakis 1. COOT: Paul Emsley 2. Modelling nucleic acids: Johan Hattne Thursday pm: Future Methods, FELs, Diffraction imaging Discussion leader: Ed Lattman 1. Anton Barty 2. Serial Crystallography: John Spence and Petra Fromme

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question about free energy calculation in protein complex
by crystallogrphy 14 May '10

14 May '10

Hi, I am trying to calculate the free energy of association for structure of a protein complexes based on the salt bridges, H-bonds and van der waals interaction? Does any one know how to do it? Thanks!

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phenix.model_vs_data
by Young-Jin Cho 13 May '10

13 May '10

Dear Phenix users, This might be trivial questions though... 1. When you did phenix.model_vs_data, I see the discrepancy between R/Rfree. 'After applying resolution and sigma cutoffs' seems more accurate one though, could someone explain why it has such-even small though- discrepancy? 2. Also, when you do phenix.polygon, I used to seeing many branches from old version. With my current version(phenix-1.6.1-343), I normally see only 5 branches. Is there any reasons for that? Thanks in advance as always. Young-Jin

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Refinement with partial model - question
by Peter Grey 13 May '10

13 May '10

Dear Phenix Users, I have a partial model at low resolution. Is there a way let Phenix.refine know the model is not complete and that when a mask is calculated for bulk solvent correction it should take this fact into consideration ? Alternatively, can I use a solvent mask from density modification program in Phenix.refine somehow ? Alternatively, is there a program that will build dummy atoms (zero occupancy) automatically in a map in all peaks above a certain sigma (i.e. atoms just for mask calculation). Thank you in advance, Peter.

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Can simulated annealing remove model bias after MR?
by Francis E Reyes 13 May '10

13 May '10

Just curious.... Thanks F --------------------------------------------- Francis Reyes M.Sc. 215 UCB University of Colorado at Boulder gpg --keyserver pgp.mit.edu --recv-keys 67BA8D5D 8AE2 F2F4 90F7 9640 28BC 686F 78FD 6669 67BA 8D5D

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B factors of zero after refinement
by Kyle Dolan 13 May '10

13 May '10

Hello all, I have been performing standard refinement of atomic coordinates and B factors (ADP) in phenix.refine using NCS and bulk solvent correction without anisotropic scaling. The program has been returning a handful of atoms with B factors of zero after refinement, and I'm not sure why. I tried using adp.set_b_iso to reset all B factors before refinement but some still come back down to zero. Has anyone else noticed something similar, or has a suggestion on what to do? Thanks, Kyle Kyle T. Dolan Department of Biochemistry and Molecular Biology The University of Chicago ktd(a)uchicago.edu

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Phenix Ligand Identification error
by Rajan 13 May '10

13 May '10

Dear All Greetings I was searching for a ligand present in the active site of my protein using Ligand Search in "PHENIX" but i stuck in between with an error : A Python error was detected. This may be a problem with the program settings, an error in your data, or a bug; click "OK" to send a bug report to the PHENIX developers. AttributeError : ligand_identification instance has no attribute 'connections' Traceback: File "/home/programs/linux/phenix- 1.6.1-357/cctbx_project/libtbx/thread_utils.py", line 137, in run return_value = self._target(self._args, self._kwargs, self._c) File "/home/programs/linux/phenix-1.6.1-357/cctbx_project/libtbx/runtime_utils.py", line 55, in __call__ result = self.target() File "/home/programs/linux/phenix-1.6.1-357/phenix/phenix/command_line/ligand_identification.py", line 1769, in __call__ identify_ligands = ligand_identification(args=list(self.args), quiet=False) File "/home/programs/linux/phenix-1.6.1-357/phenix/phenix/command_line/ligand_identification.py", line 308, in __init__ ligand_identification.Run(self, params) File "/home/programs/linux/phenix-1.6.1-357/phenix/phenix/command_line/ligand_identification.py", line 1454, in Run return self.connections['STOP '] I am not able to identify the problem? Please let me know if some one can identify the problem, i don't know whether it is a bug or problem in my files. Thanks for your suggestions in advance. Rajan -- ************************************************ Current Address: Rajan Vyas Research Scholar Deptt. of Biotechnology Panjab University Chandigarh, India 160014 Mob. +919417374197 Fax: +91-172-2625254 ************************************************

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Re: [phenixbb] General user proposal deadline May 15, 2010
by Peter Zwart 12 May '10

12 May '10

Dear All, Just a reminder that May 15, 2010 is the deadline for the July-August 2010 Rapid Access Proposal cycle for PX beamtime at the ALS. The BCSB beamlines (5.0.1,5.0.2, 5.0.3, 8.2.1 & 8.2.2) can all be operated remotely and are all equipped with ADSC Q315(R) detectors. Beamlines 8.2.2, 8.2.1 and 5.0.2 are tuneable stations whereas 5.0.1 and 5.0.3 are fixed-wavelength beamlines. Control software for the beamlines features an interface allowing ultra high-throughput screening, automated annotation of diffraction quality and on the fly indexing and collection strategy feedback. The automounters in use on sector 5 support the unipuck and the ALS puck (both commercially available at http://www.crystalpositioningsystems.com). Beamlines 8.2.1 and 8.2.2. support in addition to the uni- and ALS puck the Rigaku system (http://www.rigaku.com/) To submit a proposal, please go to the ALS website link listed below: http://alsusweb.lbl.gov/4DCGI/WEB_GetForm/PXProposalEntry.shtml/Initialize Thank you, Stacey Ortega 510-495-2450

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