- phenixbb - phenix-online.org

[Feature request] Exclude atoms outside user provided mask from refinement (in phenix.real_space_refine)
by Oliver Clarke 26 Feb '18

26 Feb '18

Hi, Often I would like to refine part of a model against a EM map generated by masked refinement. Such a map is typically better than the globally refined map in the region within the mask, and worse outside it. It would be useful to have the capacity to refine the same model first against the globally refined map, and then against the maps generated by masked refinement, but restricting refinement in the latter case to atoms/residues within the bounds of the mask. Is this something that could be maybe added in a future version of phenix.real_space_refine? This would mean allowing the user to provide a mask file, and setting an option to exclude all atoms/residues outside the mask boundaries from refinement. Cheers Oli

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refining a covalent-bound ligand
by Sebastiano Pasqualato 26 Feb '18

26 Feb '18

Hi there, I have a pretty basic question. I am refining a structure in which a drug has been covalently linked to a Cys of the protein. I have generated the .cif fie for the ligand, but I don’t know how to tell the program that carbon C04 has to be covalently linked to the SG of the Cys. Is that sufficient to insert a LINK record in the pdb file? What is the correct syntax for that? Thanks a lot for the feedback and sorry for the naive question, ciao, Sebastiano -- Sebastiano Pasqualato, PhD Crystallography Unit Department of Experimental Oncology European Institute of Oncology IFOM-IEO Campus via Adamello, 16 20139 - Milano Italy tel +39 02 9437 5167 fax +39 02 9437 5990 web http://is.gd/IEOXtalUnit

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Information regarding Anisotropic atoms
by pooja kesari 22 Feb '18

22 Feb '18

I observed that phenix.refine tool is adding anisotropic atoms to the pdb file by default even at resolution more than 2A. Can anyone please suggest why is it doing so?

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lattice symmetry and free-set selection?
by Edward A. Berry 22 Feb '18

22 Feb '18

Where can I find description of the free-r selection parameters: refinement.input.xray_data.r_free_flags { lattice_symmetry_max_delta=5 use_lattice_symmetry=True } ?

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Industrial Biostructures America 2018 conference
by Leonard,Paul G 20 Feb '18

20 Feb '18

Dear all, The inaugural Industrial Biostructures America conference will be held on 20-22 May 2018 at the Hilton La Jolla Torrey Pines Hotel in San Diego, California. Conference registration and accommodation information is available at: https://industrialbiostructuresamerica.org/ This conference brings together structural biologists from across the pharmaceutical and biotech industry to showcase their cutting-edge research. Scientific sessions will cover the following topics: * Cryo-EM * X-ray crystallography * Lead discovery using NMR * Protein design * Membrane crystallography The Abstract submission deadline is 23rd March 2018. We look forward to seeing you there, Paul Leonard Institute Research Scientist MD Anderson Cancer Center pleonard1(a)mdanderson.org<mailto:[email protected]> The information contained in this e-mail message may be privileged, confidential, and/or protected from disclosure. This e-mail message may contain protected health information (PHI); dissemination of PHI should comply with applicable federal and state laws. If you are not the intended recipient, or an authorized representative of the intended recipient, any further review, disclosure, use, dissemination, distribution, or copying of this message or any attachment (or the information contained therein) is strictly prohibited. If you think that you have received this e-mail message in error, please notify the sender by return e-mail and delete all references to it and its contents from your systems.

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BEAM TIME AVAILABLE FOR MACROMOLECULAR CRYSTALLOGRAPHY
by Salbego, Cyndi 18 Feb '18

18 Feb '18

BEAM TIME AVAILABLE FOR MACROMOLECULAR CRYSTALLOGRAPHY AT THE TWO ID BEAMLINES OF NE-CAT AT APS. We currently have a number of days open in March. Below is a brief description of our beam lines, and links with more information. The 24-ID-C beamline can deliver X-rays in the range of 6 to 21 keV or ~2.1 to 0.5 Å. This covers most of the popular elemental edges for phasing. This wide energy-range also makes the beamline well suited for ultra high-resolution data collection and soft X-ray sulfur SAD phasing. The beamline is equipped with an optional kappa goniometer for optimal alignment of crystals. A Pixel Array Detector (PAD), Pilatus-6MF, installed on the 24-ID-C beamline helps measure very weak Bragg reflection intensities due to its noise-less readout technology and also provides a very fast data collection capability in shutter-less data collection mode. The 24-ID-E beamline is a fixed energy microdiffraction beamline delivering X-rays at 12.66 keV, optimized for Se-SAD experiments. It is equipped with an Eiger-16M Pixel Array Detector, offering advantages similar to those of the Pilatus-6MF. For more information on our beamlines (beamline and robot manuals): http://necat.chem.cornell.edu To ask about available time please contact Raj Rajashankar (rajashankar(a)anl.gov<mailto:[email protected]>) or Cyndi Salbego (csalbego(a)anl.gov<mailto:[email protected]>) for further information. To apply for General User Time (Rapid Access for current run cycle) please follow this link: https://beam.aps.anl.gov/pls/apsweb/gup0005.start_page Cyndi Salbego Administrator, NECAT 630.252.0689

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9th workshop on Neutron Scattering Applications in Structural Biology
by Meilleur, Flora 14 Feb '18

14 Feb '18

First announcement 9th Workshop on Neutron Scattering Applications in Structural Biology Oak Ridge, TN. June 11 - June 15, 2018 Detailed information: https://conference.sns.gov/biologyneutrons18/ Application deadline: April 30, 2018 The workshop on Neutron Scattering Applications in Structural Biology aims at enabling structural biologists to fully exploit the latest instrumentation and software development at the SNS and HFIR facilities at Oak Ridge National Laboratory. Attendees will participate in lectures and tutorials focusing exclusively on neutron techniques applied in structural biology. The workshop is designed for graduate students, post-doctoral fellows and faculty new to or with limited experience of neutron scattering. Flora Meilleur, Ph. D Associate Professor, Molecular and Structural Biochemistry North Carolina State University Neutron Scattering Scientist, Neutron Sciences Directorate Oak Ridge National Laboratory

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Postdoctoral position in membrane protein structure and function at the NIH
by Anirban Banerjee 13 Feb '18

13 Feb '18

There is an open postdoctoral position for a membrane protein structure-function project in my lab at the NIH. We are currently focusing on integral membrane enzymes (Science. 2018, doi: 10.1126/science.aao6326) and transporters of transition metal ions (J Biol Chem. 2018, doi: 10.1074/jbc.M117.817478). Here is the formal announcement - EUNICE KENNEDY SHRIVER NATIONAL INSTITUTE OF CHILD HEALTH AND HUMAN DEVELOPMENT, BETHESDA, MD AND SURROUNDING AREA Position Description: The research group of Dr. Anirban Banerjee at the National Institutes of Health (NIH) is seeking candidates for postdoctoral fellows . The broad interests of the lab are in membrane protein structure and function. We combine structural techniques such as macromolecular crystallography with biophysical and biochemical methods such as reconstitution based assays, high resolution microscopy and small molecule screening to investigate the structural bases of the mechanisms of a number of membrane proteins. The lab has state-of-the-art equipment and facilities. We have dedicated periodic access to the 22-ID beamline at the APS, for crystallographers at the NIH, as well as access to 23-ID and 24-ID beam lines at the APS. Our laboratory is part of the Cell Biology and Neurobiology Branch in the Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD). We also have an affiliation to the National Institute of Neurological Disorders and Stroke (NINDS). Qualifications: The candidates should hold a Ph. D. degree, be author of at least one first author publication and have a strong background in biochemistry or structural biology. Experience with basic molecular biology, protein expression, purification and biochemical characterization are required. Prior experience in membrane protein biochemistry or mammalian expression system for protein purification will be added advantages. It is absolutely essential the candidate is motivated and prepared to put in the best efforts for fruition of the project goals. We are a small, friendly lab and ability to work as part of a cohesive group is important. To Apply: Interested candidates can send an e-mail to anirban.banerjee(a)nih.gov with a CV and a summary of previous research experience and future interests. The NIH is dedicated to building a diverse community in its training and employment programs.

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how to inhibit selectively undue H....O repulsion during refinement with phenix.refine ?
by Maxime Cuypers 10 Feb '18

10 Feb '18

Hello, i am refining neutron data with hydrogens on water molecules complexes that systematically bounce the whole molecule away from the hydroxyls or carboxylic groups or other waters. the Fo-Fc map is crystal clear about where the H atoms should go... any commands i can enter in i.e. a .param file to inhibit repulsion and promote closer h bonds? thanks for your help, cheers, Dr. Maxime Cuypers Post-Doctoral Research Associate, Structural Biology St Jude Children s Research Hospital, 262 Danny Thomas Place Memphis, TN 38105-3678, USA

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query re local grid search in phenix.real_space_refine
by Oliver Clarke 10 Feb '18

10 Feb '18

Hi all, Related to the last message - when using local_grid_search, does phenix attempt to torsion-angle search every residue, or just outliers? It would seem like maybe using EMRinger or similar to identify residues where there is strong sidechain density, but in a non-rotameric position or with an incorrectly fit rotamer might be one way to make it more efficient if it is the former. I don’t want phenix trying to do a local grid search on residues with no sidechain density - these may be in an area of the map with poor local resolution, perhaps where I have docked a crystal structure, or carefully manually adjusted rotamers - local grid search in these regions is likely to make things worse if it is not focused on residues with clear sidechain density. Cheers Oli

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