- phenixbb - phenix-online.org

Postdoctoral position in Structure and Function of Fungal Membrane Proteins
by Maike Bublitz 02 Aug '17

02 Aug '17

Postdoctoral position in Structure and Function of Fungal Membrane Proteins A post-doctoral position is available in the research group of Associate Prof. Maike Bublitz at the Department of Biochemistry, University of Oxford. The project aims to understand the structure and function of fungal membrane transport proteins identified as potential new drug targets, using a combination of state-of-the-art structural (X-ray crystallography, cryo-EM) and biochemical/biophysical techniques. Applicants should hold a PhD in a relevant subject area, such as membrane protein biochemistry or structural biology. Experience in native or recombinant membrane protein expression, purification and either structural determination or functional analysis using biochemical and biophysical techniques is essential. Ability to work in a team as well as contribute to supervision activities and excellent verbal and written communication skills are expected. Experience in protein X-ray crystallography and/or cryo-EM is an advantage. To apply for this role and for further details, including the job description and selection criteria, please click on the link below: https://www.recruit.ox.ac.uk/pls/hrisliverecruit/erq_jobspec_details_form.j… Applications for this vacancy are to be made online by 31th August 2017.

1 0

(no subject)
by Priyanka Abeyrathne 21 Jul '17

21 Jul '17

1 0

Phenix version 1.12 released
by Paul Adams 14 Jul '17

14 Jul '17

The Phenix developers are pleased to announce that version 1.12 of Phenix is now available (build 1.12-2829). Binary installers for Linux, Mac OSX, and Windows platforms are available at the download site: http://phenix-online.org/download/ Highlights for this version: New tools for secondary structure validation, comparing multiple related structures, cryo-EM model and map validation, and calculation of real space difference maps. Video tutorials are now available on the new Phenix Tutorial YouTube channel (www.youtube.com/c/phenixtutorials). A suite of tools for cryo-EM model building and structure refinement including automated map sharpening, segmentation, and model building. Real space refinement now has an option to use histogram equalized map as a refinement target. Phaser version 2.8 has several new features, including unit cell refinement for EM data, more extensive use of eLLG in decision making and analysis, anomalous substructure determination (Phassade), improved tNCS detection and analysis, and improvements to SCEDS. - NEW TOOLS - phenix.secondary_structure_validation - tool to validate secondary structure section in .pdb and .mmcif files with option to filter bad annotations. - Structure Comparison: tool for parallel validation and analysis of near-identical protein structures. Results include the analysis of ligands, rotamers, Ramachandran angles, missing atoms, water locations and B-factors. - phenix.mtriage: command-line tool to validate cryo-EM models. GUI is available. Computes various map statistics including resolution estimates, FSC between half-maps, full and model maps. Outputs mask file used to compute FSC. Still under development. - phenix.real_space_diff_map: command-line tool to compute difference map. This is a real-space analogue of Fo-Fc map mainly designed for cryo-EM maps. See http://phenix-online.org/newsletter/CCN_2017_01.pdf for details. - PHENIX VIDEO TUTORIALS Video tutorials about Phenix tools are now available on the Phenix Tutorial YouTube channel (www.youtube.com/c/phenixtutorials). The following topics are covered: - How to run phenix.refine - How to calculate polder maps - How to run phenix.real_space_refine - How to run PDB tools - How to change phenix.refine parameters via the GUI - Basic Phenix eLBOW tutorial - How to run Phaser-MR from the Phenix GUI - Explaining the atom selection syntax - How to run Structure Comparison - NEW FEATURES - Phenix.auto_sharpen: New map sharpening algorithms available based on (1) optimization of map clarity (adjusted surface area or kurtosis), (2) resolution-dependent map-model correlation, (3) resolution-dependent half-map correlation, and (4) local map sharpening - Phenix.map_to_model: Iterative map improvement using model from one cycle to optimize sharpening of the map for the next cycle - Phenix.map_to_object: Now you can individually map each member of a group of chains onto your target - Phenix.chain_comparison: Now can compare a target to each of a group of models - Phenix.find_alt_orig_sym_mate: Now uses ssmalignment.stats to see what residue pairs were included by ssm in a hypothetical calculation of the ssm-rmsd. This is to avoid including atoms that even for an optimal structural alignmentwould have been too far apart that ssm would use them. Excluding these is necessary to avoid having the calculated rmsd blow up. - Now using angles for restraining hydrogen bonds in alpha helices and beta sheets in secondary structure restraints. - Phenix.polder: New option (compute_box=True) to compute a difference map excluding the bulk solvent mask within a user-defined box. The map can be used to inspect interesting difference density peaks. - phenix.map_model_cc (phenix.model_map_cc): various enhancements and bug fixes. - phenix.real_space_refine: - improved ADP refinement (still group) - improved NCS constraints definition - multi-model PDB file is not output by default anymore - (experimental) option to use masked histogram equalized map as refinement target. Using such map dramatically improves refined model geometry. This map is not suitable for ADP refinement. - show CCmask, CCvolume and CCpeaks that report on local and gloabal model to map fit. - RESTRAINTS - Specialised restraints for ligands with differing chemistry in the same model allows using the same 3-letter code but different restraints for a specific instance - apply_cif_restraints - Detailed control of peptide planes and omega angles - apply_all_trans - apply_peptide_plane - apply_cis_trans_specification: use an atom selection (CA) to force a cis or trans omega angle - REEL - Improvements to robustness and features - GUI - New interfaces - phenix.mtriage - phenix.map_box - phenix.auto_sharpen - phenix.map_to_model - phenix.ncs_average (under "Other Tools") - phenix.sculpt_ensemble (alpha) - Updated interfaces - Comprehensive Validation shows real-space correlations from phenix.map_model_cc when map files are used - Structure Comparison - Validation - improved speed of clashscore validation - bug fix to handling of cis-peptides in ramalyze - contours for ramalyze, rotalyze, and cablam now accessible at https://github.com/rlabduke/reference_data - validation GUI now shows altloc identifirs for most outliers - improved internal code accessibility of validation statistics - Phaser-2.8.0 - refinement of cell for data (electron micrcoscopy) - more analysis using eLLG for component addition - more analysis using eLLG for polyalanine residues for target eLLG given rms - more analysis using eLLG for single atoms more ordered than average - more analysis using eLLG for chains/gyre-and-gimble * Phassade: Fast Fourier Transform Anomalous Substructure Determination - SOLU TRIAL records RF-LLG for trial orientation - gyre and translation function report RF recorded for trial orientations - 'scons --ccp4' command line flag for ccp4 build (generates ccp4-style headers) * improved tNCS detection and analysis * gyre and gimble improved for output and python scripting * NMA outputs all perturbed files in MODEL delimited pdb file '<fileroot>.nma.pdb' * sceds outputs domains to chain delimited file '<fileroot>.nma.pdb' - sceds domain pdb file have TER separated domains - NMA option to output separate pdb files for each perturbation (XYZOUT NMA ALL OFF) - sceds option to output separate pdb files for each domain (XYZOUT NMA ALL OFF) - NMA has option to turn off output of input coordinates (NMA ORIG ON) - pdb chain identifies can be left unchanged from input (XYZOUT CHAIN COPY) (for Eleanor) - bugfixes -- allow peaks and purge percent to override one another if not default -- rms estimation developer options not being set correctly -- throw out of memory error if Patterson map allocation fails For a full list of changes see: http://www.phenix-online.org/documentation/CHANGES Please note that this publication should be used to cite use of Phenix: PHENIX: a comprehensive Python-based system for macromolecular structure solution. P. D. Adams, P. V. Afonine, G. Bunkóczi, V. B. Chen, I. W. Davis, N. Echols, J. J. Headd, L.-W. Hung, G. J. Kapral, R. W. Grosse-Kunstleve, A. J. McCoy, N. W. Moriarty, R. Oeffner, R. J. Read, D. C. Richardson, J. S. Richardson, T. C. Terwilliger and P. H. Zwart. Acta Cryst. D66, 213-221 (2010). Full documentation is available here: http://www.phenix-online.org/documentation/ There is a Phenix bulletin board: http://www.phenix-online.org/mailman/listinfo/phenixbb/ Please consult the installer README file or online documentation for installation instructions. Direct questions and problem reports to the bulletin board or: help(a)phenix-online.org and bugs(a)phenix-online.org Commercial users interested in obtaining access to Phenix should visit the Phenix website for information about the Phenix Industrial Consortium. The development of Phenix is principally funded by the National Institute of General Medical Sciences (NIH) under grant P01-GM063210. We also acknowledge the generous support of the members of the Phenix Industrial Consortium. -- Paul Adams Division Director, Molecular Biophysics & Integrated Bioimaging, Lawrence Berkeley Lab Division Deputy for Biosciences, Advanced Light Source, Lawrence Berkeley Lab Adjunct Professor, Department of Bioengineering, U.C. Berkeley Vice President for Technology, the Joint BioEnergy Institute Laboratory Research Manager, ENIGMA Science Focus Area Building 33, Room 347 Building 80, Room 247 Building 978, Room 4126 Tel: 1-510-486-4225, Fax: 1-510-486-5909 http://cci.lbl.gov/paul Lawrence Berkeley Laboratory 1 Cyclotron Road BLDG 33R0345 Berkeley, CA 94720, USA. Executive Assistant: Louise Benvenue [ LBenvenue(a)lbl.gov ][ 1-510-495-2506 ] --

1 0

Problem with smiles string in elbow
by Edward A. Berry 13 Jul '17

13 Jul '17

I'm not getting the expected result with this string: COC(=O)C(=COC)c1ccccc1COC(N1C)=CC(=N1)C(=C2O)C=C(Cl)C=C2 When used with coot Lidia it gives the expected result (upper picture). But when I run elbow like this: phenix.elbow --smiles="COC(=O)C(=COC)c1ccccc1COC(N1C)=CC(=N1)C(=C2O)C=C(Cl)C=C2" --output="Y7303" --id="Y03" the result is the lower picture. In particular the pyrazole ring (arrow) gets distorted, but other bond lengths are way off. I want to use elbow because it names the atoms as numbered in the order they appear in the smiles string, irrespective of the element. This is good because this is one of a series of compounds in some of which C's are replaced by N's and vice versa so it helps to have the same number for atoms in the same position. What does work is to save the structure as .mol from Lidia and feed that to elbow, which gives the right structure and the elbow atom names. But it would be good to find out why it isn't working directly. my elbow is: electronic Ligand Builder & Optimisation Workbench (eLBOW) 1.12rc1-2801 None

1 0

Problem with rotamer refinement
by Renato Ferras 11 Jul '17

11 Jul '17

Dear all, I am refining a protein structure at 1.74 A resolution with phenix.refine (version 1.10.1_2155) and I have noticed that some side chains don't remain in the electronic density even after careful hand adjustment in which they are almost perfect. It seems pretty clear where the side chain should (must) be located, moreover it is consistent with two rotamers (either rotamer tp60 - #4 in coot - or rotamer tp-100 - #9 in coot -, which are approx. at 180 deg for chi3). In spite of that, after reciprocal space refinement, I observe that the end of side chain rotates chi3 angle and both N and O gets far from where they started (there is this difference in the chi3 angle). My concerns are about the proper interpretation of geometrical restraints listed in .geo file, specially what the ideal value is, how weights are applied to ideal value and why phenix doesn't reach convergence in reciprocal space refinement. Below are the values from .geo for the referred Gln: dihedral pdb=" CB GLN B 21 " pdb=" CG GLN B 21 " pdb=" CD GLN B 21 " pdb=" OE1 GLN B 21 " ideal model delta sinusoidal sigma weight residual 0.00 23.41 -23.41 2 3.00e+01 1.11e-03 8.42e-01 is there a description for us to interpret what these numbers are? To my understanding, the ideal values are established as being either 0 or 180 degrees (yet sinusoidal 2). I cannot say about how heavy the weights are on these (in fact, I left my refinement to optimize weights), but anyway, if I understand correctly, the ideal value (for chi3) should be rotamer dependent. Taking Gln as an example, I see several rotamers do have values close to either 0 or 180 degree, but what about rotamers 4 and 9? I might imagine a similar situation for residues like Asn and His, though I have not searched deep for these yet. Thanks, Renato

2 1

crystal imaging system
by Sebastiano Pasqualato 30 Jun '17

30 Jun '17

Dear all, we are in the process of considering the purchase of a new Crystal Imager. So far, we have been considering the Formulatrix Rock Imager 182 and the TriTek Crystal Pro HT. I would be extremely grateful to anyone who could provide me: - feedback and user experience (positive/negative) on those instruments; - information on other instruments you would suggest. Thank you very much in advance, wishing you a pleasant weekend, best regards, ciao, S -- 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

2 1

Phenix polder error
by Avinash Punekar 26 Jun '17

26 Jun '17

Dear all, When I run phenix.polder through command line, I get a message "Sorry: Multiple equally suitable arrays of observed xray data found." and phenix.polder stops without producing the maps. How to solve this problem? Any help is highly appreciated. Thanks, Avinash

2 1

does phenix refine fill in missing data?
by Ursula Schulze-Gahmen 22 Jun '17

22 Jun '17

I have very anisotropic data. I used the staraniso webserver to analyse and process my data which creates a final merged file with very incomplete data in the outer shells. If I use this data file in Phenix, what will happen? Will Phenix automatically fill in the unobserved data? If so, can I prevent it from doing so? I am importing the data with the reflection file editor and it seems the reflections are being filled in already at this stage. Ursula -- Ursula Schulze-Gahmen, Ph.D. Project Scientist UC Berkeley, QB3 360 Stanley Hall #3220 Berkeley, CA 94720-3220 (510) 643 9491

2 1

Cif file recognition
by Joel Tyndall 22 Jun '17

22 Jun '17

Hi there, Having a few minor issues with my phenix setup on windows 10. I have the latest stable build Phenix1.11.1-2575. When introducing a new ligand that exists in the monomer library, Pheix complains it does not have the geometry restraints (cif file) - somehow it is not seeing its own library. How can I set up the cif library as default? Cheers Joel Joel Tyndall | BSc(Hons) PhD Associate Professor in Medicinal Chemistry School of Pharmacy | Te Kura Mātauraka Wai-whakaora University of Otago | Te Whare Wānanga o Otāgo PO Box 56 9054 Dunedin | Ōtepoti New Zealand | Aotearoa Ph: 64 3 479 7293 Skype: jtyndall Website | pharmacy.otago.ac.nz

2 1

sculptor modifications
by Emilia C. Arturo (Emily) 21 Jun '17

21 Jun '17

Hello All, Is there a way to identify quickly the changes to a model that Sculptor has made? I am running the Phenix GUI to use Sculptor. I have read through the out-put log file, and understand (mostly) the sculpt protocol as it relates to the circumstances under which modifications to main chain or side chains are made, but it would be nice to see (in a list format, perhaps) what changes (if any...) were made. Regards, Emily. -- "Study as if you were going to live forever; live as if you were going to die tomorrow." - Maria Mitchell "I'm not afraid of storms for I'm learning to sail my ship." - Louisa May Alcott

4 3