- phenixbb - phenix-online.org

how to generate an isomorphous difference map
by crystallogrphy 13 May '15

13 May '15

Hi, I am trying to generate an isomorphous difference map with phenix GUI. I input reflection 1 and 2 with mtz format and a PDB model, I got an MTZ format map file. Because I want to load it to coot or pymol with negative and positive density, I need to transform this mtz map to ccp4 map. However, FFT map cannot work. Does any know how can I get a ccp4 format maps with positive or negative density? Thanks!

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Scientist-I (Structural Biology) - Frederick National Lab for Cancer Research
by Dhirendra K Simanshu 13 May '15

13 May '15

Dear colleagues, We have an opening for a Scientist-I (Structural Biology) position here in Frederick, MD. If not interested, please forward this email to those who might be. To apply for this position and for further details, including a job description and qualifications, please click on the link below: http://jobs.leidos.com/ShowJob/Id/475028/Scientist-I-615658-%28NCI%29/ Thank you Dhirendra *------* *JOB DESCRIPTION * The Scientist I will work in support of the FNL/NCI RAS Initiative. One of the major objectives of the RAS initiative at the Frederick National Lab for Cancer Research (FNLCR) is to conduct structural analysis of KRAS mutants and biologically relevant KRAS activator/effector complexes in support of drug discovery efforts. The Scientist I will be responsible for: 1) carrying out structural studies on KRAS-effector complexes through the entire protein crystallographic process, including construct design, protein purification, biochemical and biophysical characterization, crystallization, X-ray data collection, structure determination and analysis, 2) working closely with an integrated team of protein scientists in the Protein Expression Laboratory (PEL) at the FNLCR, 3) participating in experimental design and to independently conduct experiments in a priority-driven environment, 4) completing projects independently and as part of a team, and providing timely updates of the project progress to their supervisor both informally and by formal report writing, and 5) generating high-quality peer-reviewed publications. Work may involve the use of potentially hazardous chemical, biological, or radiological materials or may be located in areas where such materials are used. May require the use of personal protective equipment and adherence to strict safety protocols. *Qualifications:* *BASIC QUALIFICATIONS* - PhD in structural biology, protein biochemistry, crystallography, or in a related discipline from an accredited college or university appropriate to biomedical research, or eight (8) years’ experience in lieu of degree - Foreign degrees must be evaluated for U.S. Equivalency - In addition to the educational requirements the candidate will need proven ability in all aspects of protein crystallography from construct design through structure determination and interpretation - Extensive experience in crystallization of protein-ligand and protein-protein complexes - Experience collecting data at synchrotron beamline and solving ab initio structures - Expertise in commonly used crystallography software packages - Proficiency in protein biochemical and biophysical characterization - Record of publications in peer-reviewed journals *PREFERRED QUALIFICATIONS* - Relevant postdoctoral experience in a structural biology laboratory. - Experience working with small GTPases, RAS-related activator/effector proteins, or membrane-associated complexes. - Knowledge of molecular dynamics simulations and protein-ligand docking. *To apply*, click here: http://jobs.leidos.com/ShowJob/Id/475028/Scientist-I-615658-%28NCI%29/

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on minimization_global of phenix.real_space_refine
by Smith Liu 13 May '15

13 May '15

Dear All, For minimization_global of phenix.real_space_refine, does it has relationship with the input map, or it is only processed based on the input pdb? Smith

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Re: [phenixbb] how to generate an isomorphous difference map
by Edward A. Berry 12 May '15

12 May '15

OK. Knowing that and rereading the OP's question and your reply, I think that was the right answer. Apologies to CCP4 for accidentally cross-posting. eab On 05/12/2015 01:21 PM, Philip Kiser wrote: > There is a tool within PHENIX that prepares an mtz file for generation of an isomorphous difference map (scales the two datasets together, etc). I assumed that is what the OP was talking about. > > On Tue, May 12, 2015 at 12:54 PM, Edward A. Berry <BerryE(a)upstate.edu <mailto:[email protected]>> wrote: > > OK. I guess I was thinking of subtracting 2fo-Fc maps, which would give essentially (Fo1-Fo2) coefficients. But coming out of phenix it will be at least 2mFo-DFc, with different m's and D's for the two datasets. Makes it rather more complicated. > eab > > On 05/12/2015 11:58 AM, Philip Kiser wrote: > > Good points. But also, the traditional isomorphous difference map is not as susceptible to model bias issues compared to a real space difference map (or a "vector" isomorphous difference map). > > On Tue, May 12, 2015 at 11:37 AM, Edward A. Berry <BerryE(a)upstate.edu <mailto:[email protected]> <mailto:[email protected] <mailto:[email protected]>>> wrote: > > > > On 05/12/2015 09:46 AM, Philip Kiser wrote: > > crystallogrphy, > > If you did everything correctly, you should be able to directly calculate the difference map in Coot from the MTZ file generated by PHENIX. You would need to open it with "Open MTZ" rather than "Auto open MTZ" and then select the appropriate map coefficients. Note that what Tim described (a real space difference map) is technically different from the traditional isomorphous difference map where the SF amplitudes of the two data sets are subtracted prior to the map calculation. > > Philip > > > Should be the same, due to linear property of the Fourier transform, EXCEPT for possible scaling differences and treatment of missing data. This latter could be significant, since presumably the traditional methods omits reflections unless present in both datasets, whereas in Tim's method each map will be made with all data available in that dataset. As a result, the largest coefficients in Tim's difference map might be the reflections which are absent in one map and present in the other. But if both have good completeness, it may not matter. > > eab > > > > On Tue, May 12, 2015 at 9:24 AM, Tim Gruene <tg(a)shelx.uni-ac.gwdg.de <mailto:[email protected]> <mailto:[email protected] <mailto:[email protected]>> <mailto:[email protected] <mailto:[email protected]> <mailto:[email protected] <mailto:[email protected]>>>> wrote: > > Dear crystallogrphy, > > you can open the PDB file with Coot, then use File -> Open MTZ to read one > mtz-file after the other into Coot. Coot will offer to generate the map > coefficients from the previously loaded PDB file. > > Once you have both maps, you can go to Extensions -> Maps -> Make a Difference > Map to create the difference map. > > In order to see both positive and negative density, you choose Extensions -> > Maps -> Set Map is a Difference Map. > > Regards, > Tim > > On Tue, May 12, 2015 at 08:43:45PM +0800, crystallogrphy wrote: > > Hi, > > > > I am trying to generate an isomorphous difference map with phenix GUI. I > > input reflection 1 and 2 with mtz format and a PDB model, I got an MTZ > > format map file. Because I want to load it to coot or pymol with negative > > and positive density, I need to transform this mtz map to ccp4 map. > > However, FFT map cannot work. > > Does any know how can I get a ccp4 format maps with positive or negative > > density? > > > > Thanks! > > > _______________________________________________ > > phenixbb mailing list > > phenixbb(a)phenix-online.org <mailto:[email protected]> <mailto:[email protected] <mailto:[email protected]>> <mailto:[email protected] <mailto:[email protected]> <mailto:[email protected] <mailto:[email protected]>>> > > http://phenix-online.org/mailman/listinfo/phenixbb > > Unsubscribe: phenixbb-leave(a)phenix-online.org <mailto:[email protected]> <mailto:[email protected] <mailto:[email protected]>> <mailto:[email protected] <mailto:[email protected]> <mailto:[email protected] <mailto:[email protected]>>> > > > -- > -- > Dr Tim Gruene > Institut fuer anorganische Chemie > Tammannstr. 4 > D-37077 Goettingen > phone: +49 (0)551 39 22149 <tel:%2B49%20%280%29551%2039%2022149> <tel:%2B49%20%280%29551%2039%2022149> <tel:%2B49%20%280%29551%2039%2022149> > > GPG Key ID = A46BEE1A > > > _______________________________________________ > phenixbb mailing list > phenixbb(a)phenix-online.org <mailto:[email protected]> <mailto:[email protected] <mailto:[email protected]>> <mailto:[email protected] <mailto:[email protected]> <mailto:[email protected] <mailto:[email protected]>>> > http://phenix-online.org/mailman/listinfo/phenixbb > Unsubscribe: phenixbb-leave(a)phenix-online.org <mailto:[email protected]> <mailto:[email protected] <mailto:[email protected]>> <mailto:[email protected] <mailto:[email protected]> <mailto:[email protected] <mailto:[email protected]>>> > > > > > _______________________________________________ > phenixbb mailing list > phenixbb(a)phenix-online.org <mailto:[email protected]> <mailto:[email protected] <mailto:[email protected]>> > http://phenix-online.org/mailman/listinfo/phenixbb > Unsubscribe: phenixbb-leave(a)phenix-online.org <mailto:[email protected]> <mailto:[email protected] <mailto:[email protected]>> > > >

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Postdoc Position - Berkeley, California
by Paul Adams 10 May '15

10 May '15

Lawrence Berkeley Laboratory Postdoctoral Fellow Job ID: 80929 Division: Physical Biosciences Date Opened: 5/8/2015 Summary: A postdoctoral position is available to work on developing new methods for macromolecular structure determination and refinement with the PHENIX software system. To learn more about Phenix visit: http://www.phenix-online.org Duties: Development and implementation of computational algorithms for structure determination using crystallography. Including methods for the assessment of crystallographic data quality, improved methods for minimization of target functions, algorithms for the automated parameterization of structure refinement, new target functions for the refinement of structures, and enhanced structure deposition tools. Qualifications: Ph.D., or equivalent experience, in computational crystallography, computational biology, bioinformatics, computational chemistry or a related field. Demonstrated experience with computational methods development. Publications in macromolecular crystallography or related field. Familiarity with software development tools such as C++, C and scripting languages such as Python. Good programming and mathematical skills. Solid interpersonal skills and the ability to work in a team environment are important. Ability to communicate with a broad range of researchers. Note that this is a multi-year position that is renewed annually on the basis on performance and continued funding. Lawrence Berkeley National Laboratory is a world leader in science and engineering research, with 13 Nobel Prize recipients over the past 75 years, and 57 present members of the National Academy of Sciences. LBNL conducts unclassified research across a wide range of scientific disciplines and hosts four national user facilities. AA/EEO employer committed to the development of a safe and diverse workforce. Learn more at http://www.lbl.gov. To apply visit https://lbl.taleo.net/careersection/2/jobsearch.ftl?lang=en and search for the job number 80929 or visit: https://lbl.taleo.net/careersection/2/jobdetail.ftl?lang=en&job=80929 -- Paul Adams Deputy Division Director, Physical Biosciences Division, 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 64, Room 248 Tel: 1-510-486-4225, Fax: 1-510-486-5909 http://cci.lbl.gov/paul Lawrence Berkeley Laboratory 1 Cyclotron Road BLDG 64R0121 Berkeley, CA 94720, USA. Executive Assistant: Louise Benvenue [ LBenvenue(a)lbl.gov ][ 1-510-495-2506 ] --

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Molecular replacement at low resolution
by mohamed noor 09 May '15

09 May '15

Dear developers I have a dataset to about 4 A in point group P 4 2 2 (Pointless suggests P 41 21 2). The protein is about 11 kDa and has an identity of about 50 % to my search model. Phaser calculated the eLLG to be about 5, and maybe not surprisingly, it failed even after using Sculptor to prepare the model. It also says that solutions with Z-scores more than 8 were rejected for failing the packing test. Are there any suggestions on getting a solution? Solvent content calculation from Xtriage suggests about 8 copies in the asu. Would this be of any help in MR? Thanks.

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Raw diffraction images required
by mohamed noor 09 May '15

09 May '15

Dear all I am looking for diffraction images that were collected to a resolution of 3 A or so (by visual inspection), highly redundant and the I/sigma at the outermost resolution should be low (not more than 1). Maybe there is something already in the JCSG database but I don't know exactly which one. I want to show that high redundancy can provide a background average to extract weak but useful spots and that this relationship increases to a certain limit. Thanks.

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How to fix atoms in refinement
by Rajeshwer Sankhala 07 May '15

07 May '15

Hi, I have flexible a flexible loop in my structure and every time i refine it derange ramachandrans. Can anyone suggest how can i fix these flexible residues in phenix refinement so basically i don't wanna refine them. Can i do this in GUI? Thanks Raj The information contained in this transmission contains privileged and confidential information. It is intended only for the use of the person named above. If you are not the intended recipient, you are hereby notified that any review, dissemination, distribution or duplication of this communication is strictly prohibited. If you are not the intended recipient, please contact the sender by reply email and destroy all copies of the original message. CAUTION: Intended recipients should NOT use email communication for emergent or urgent health care matters.

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feature request: update project
by Sebastiano Pasqualato 07 May '15

07 May '15

Dear Phenix developers, it happened to me recently to go from one Mac to another, working on the same Phenix projects. I have the directory synchronised via Google Drive, with the same absolute path. Importing a project is not a problem, at all. The problem is that, if I modify one project on one computer, the changes are not “seen” by the other computer, and there is no way to “update” the project, forcing it to read the info on the .phenix directory. Would that be difficult to implement? Thanks a lot in advance, best, 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/IEO_XtalUnit <http://is.gd/IEO_XtalUnit>

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on phenix.real_space_refine
by Smith Liu 06 May '15

06 May '15

Dear All, If I only want to refine resi 30-50 in Chain A by phenix.real_space_refine, and my protein contains A, B, C chains of a identical sequence of 800 aas, will you please let me know how can I specify "residue 30-50 of Chain A" in the phenix.real_space_refine command? Smith

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