January 2013 - phenixbb - phenix-online.org

density level
by CPMAS Chen 14 Jan '13

14 Jan '13

Dear PhenixBBer, I recently updated my old phenix-1.6.4-486 to phenix-dev-1266. To my surprise, the absolute electron density on the 2Fo-Fc map is quite different. https://www.dropbox.com/s/prs0z8ayb73kg9k/Screenshot_sigma.png At the same sigma level(1.5), the absolute density of the violet map is 0.32e/A^3 (phenix-dev-1266), while that of the blue map is 0.01e/A^3(phenix-1.6.4-486). Besides the different phenix used, there is no other difference on the data and model used. Sam encountered a similar problem on the density. http://phenix-online.org/pipermail/phenixbb/2012-December/019226.html By the way, is there a simple way to keep only F and SIGF column of the autoxds generated truncate.mtz via phenix? the GUI does not allow to reduce columns. I normally use IMEAN and SIGIMEAN to do refinement, but this may not be necessary as it is pointed in the maillist, since the intensity is already transformed to amplitude after truncation in autoxds. I can specify labels by xray_data.labels = "F, SIGF", but apparently phenix treats it as containing anomalous data. the following is extracted from the refine pdb file MIN(FOBS/SIGMA_FOBS) : 1.16 REMARK 3 COMPLETENESS FOR RANGE (%) : 97.11 REMARK 3 NUMBER OF REFLECTIONS : 143207 REMARK 3 NUMBER OF REFLECTIONS (NON-ANOMALOUS) : 73247 Also, in the auto generated def file, xray_data.labels = "F, SIGF, DANO, SIGDANO" Or there is a work round for this issue? Thanks! -- *************************************************** Charles Chen Research Associate University of Pittsburgh School of Medicine Department of Anesthesiology ******************************************************

3 2

Refining anomalous groups
by Brennan Bonnet 13 Jan '13

13 Jan '13

Hi All, I hope everyone had relaxing holidays to begin the new year. I am back to work trying to refine anomalous groups using phenix.refine. I have managed to merge my files so that my exptl_fobs_phases_flags_1_with_hl_anom.mtz now contains F(+), SIGF(+), F(-), SIGF(-). Now I have a new problem which was not occurring before the break. Usually I check the box for "Anomalous groups", then select "Modify selections for: Anomalous groups" which brings up a screen for atom selection and definition of f' and f''. In the past, clicking on the View/pick button launches Coot for selection of the atoms. Sadly, now clicking on the View/pick doesn't launch Coot and instead crashes Phenix. Does anyone else have this problem or know how to fix it? Please help! Thanks, ~Brennan~

4 13

Problem rebuilding ligand structure
by bsubedi＠btk.fi 11 Jan '13

11 Jan '13

Hi, I am using Phenix 1.0-1069 for refinement and coot 0.7-pre-1 for visualization and rebuilding. I used SMILES in coot to build the ligand and then merged them with PDB.I had to do this as a separate step for both chains and the .cif file so produced was not accepted for refinement. I used readyset to obtain the restrains for refinement using .pdb file, even though my refinement works, when i try to run real build refine in coot I get this error message: Failed to match (to the dictionary) the following model atom names: HB3 O6 C10 C11 C12 O7 C13 O5 C8 C9 ...... That would cause exploding atoms, so the refinement didn't start. Could someone help me with fixing this problem. Best regards, Bishwa

4 3

symmetry related bond restraint in R3 space group
by Xiang Li 11 Jan '13

11 Jan '13

I am trying to add some restraints between symmetric molecule with symmetry operation. However, I found it is not correct to use the operation information directly provided in Coot. The crystal I worked on has R3 symmetry. The symmetry operation in Coot shows to be -x+y,-x,z+ (1,1,0) and it did not work in Phenix refine. I read one previous email on this topic about the difference of symmetry operation in Coot and Phenix. However, I do not know how to do the conversion between the two when the numbers changed. Could you help me to work out on correct the symmetry operation in Phenix and talk some more on how to do the conversion please? I really appreciate your help! Sincerely, Xiang

2 1

AutoSol error
by Luca Pellegrini 10 Jan '13

10 Jan '13

AutoSol (phenix 1.8.1-1168) stops at the build stage with the following message: *** ERROR MESSAGE: The cell appears to have changed during the run Original cell: [49.22, 91.325, 103.285, 113.16, 97.64000000000001, 76.74] New cell : [49.173301696777344, 92.32479858398438, 103.37100219726562, 66.54070281982422, 82.29070281982422, 76.58550262451172] If running from a script, please specify the space group in the input file. The incorrect space group may be coming from another wizard... *** Can you please advice as to what might be wrong? I am running AutoSol from the GUI and it did pick up the space group from the mtz file. What AutoSol refers to as the 'new cell' is actually my original cell. I was running two AutoSol jobs simultaneously from two mtz files with the same cell dimensions, and they both failed with the same message. Thanks, Luca Luca Pellegrini Department of Biochemistry University of Cambridge 80 Tennis Court Road Cambridge CB2 1GA - UK Email: lp212(a)cam.ac.uk Tel: 0044-1223-760469 Fax: 0044-1223-766002 Sanger building, room 3.59

3 3

DEN refinement and reference model
by Luca Pellegrini 08 Jan '13

08 Jan '13

Phenix.den_refine (1.8.1-1168) stops and complains that: "Sorry: Reference model contains SEGIDs that do not match the working model." I have four chains in both working and reference model, ordered in the same way (A to D). Chains A and C are the same molecule, and chains B and D are also the same. Can you please advice? Some of the chains in the reference model contain more residues, is this a problem? Thanks for your help. Luca Luca Pellegrini Department of Biochemistry University of Cambridge 80 Tennis Court Road Cambridge CB2 1GA - UK Email: lp212(a)cam.ac.uk Tel: 0044-1223-760469 Fax: 0044-1223-766002 Sanger building, room 3.59

2 2

dev-1261 wizard.test fail
by Morten Groftehauge 08 Jan '13

08 Jan '13

Hi guys, I just updated Rosetta to 3.4 and it seems to have compiled correctly (at least no error interruptions). I've done this enough to not be satisfied by that and ran > phenix_regression.wizards.test_command_line_rosetta_quick which goes past the Rosetta tests correctly but fails at ================================================================= Running test_prerefine ------------------------------------------------------------ Numbers do not match: 0.47825 0.53601 r {{ 0.87799 0.06946 -0.47362} {-0.02049 0.99396 0.10779} { 0.47825 -0.08494 0.87411}} --- r {{ 0.84375 0.06393 -0.53291} {-0.02789 0.99676 0.07541} { 0.53601 -0.04877 0.84280}} ------------------------------------------------------------ FAILED See log files test_prerefine/test_prerefine.log test_prerefine/test_prerefine_current.log ================================================================= Running test_prerefine_double OK ================================================================= Running test_prerefine_no_data ------------------------------------------------------------ Numbers do not match: 0.47825 0.53601 r {{ 0.87799 0.06946 -0.47362} {-0.02049 0.99396 0.10779} { 0.47825 -0.08494 0.87411}} --- r {{ 0.84375 0.06393 -0.53291} {-0.02789 0.99676 0.07541} { 0.53601 -0.04877 0.84280}} ------------------------------------------------------------ FAILED See log files test_prerefine_no_data/test_prerefine_no_data.log test_prerefine_no_data/test_prerefine_no_data_current.log ================================================================= When I look in the log there are no error messages. I don't need to prerefine so I'm good but I still find it weird. I tried again with Rosetta 3.3 and got no error flags. Is it because the quick tests are checking the result against the results that you got earlier and the algorithm has been changed between 3.3 and 3.4? Cheers, Morten PS Really enjoyed the talks at the CCP4 study weekend. -- Morten K Grøftehauge, PhD Pohl Group Durham University

3 4

mr_rosetta and disulphide bonds
by Morten Groftehauge 07 Jan '13

07 Jan '13

Hello again, I forgot my important question in all my "this seems to be working but the test says it doesn't"-drama: How do I specify disulphide bonds for MR_rosetta? I know it keeps them if they are in the input model but disulphides are generally poorly conserved, especially in the %identity range where mr_rosetta is the most useful. According to the changelog this feature should be available in the latest dev. Cheers, Morten -- Morten K Grøftehauge, PhD Pohl Group Durham University

2 2

Ph.D. position at Lund University
by Derek Logan 07 Jan '13

07 Jan '13

A 4-year PhD position is available in the groups of Dr. Derek Logan and Prof. Ulf Ryde at the Dept. of Biochemistry and Structural Biology and the Dept. of Theoretical Chemistry at Lund University, Sweden. The project is sponsored by the European Spallation Source and will also involve the participation of ESS scientists. The PhD student will work on structural and theoretical studies of protein-ligand interactions, using the carbohydrate binding protein galectin-3 as a model system. Structural studies will be conducted principally using neutron crystallography in combination with X-ray crystallography at very high resolution (< 0.9 Å). The work will include production of crystals of suitable size for neutron diffraction, data collection at various neutron sources around the world, data processing and modelling. The theoretical studies will be conducted in Ulf Ryde's group at Theoretical Chemistry. We will develop methods to combine crystallographic refinement and quantum mechanical calculations. In addition, we perform molecular dynamic simulations and estimates of binding affinities using free-energy perturbation. The project is part of a larger network at Lund University including organic chemists, medical scientists and NMR experts, dedicated to a fundamental understanding of protein-ligand interactions in general and galectin inhibition in particular. The candidate must have bachelor's degree in an appropriate subject (preferably chemistry) and should ideally have previous experience in structural biology, both theoretical and practical. The candidate should also have good knowledge of theoretical chemistry. Experience of quantum chemistry, statistical mechanics and simulations is an advantage. The deadline for application is 31st January 2013. For more information on the eligibility requirements, please see: http://admin.lu.se/o.o.i.s?id=22598&Dnr=511988&Type=E Application should be made using the link in the right hand column of this web page. For informal enquiries on the project contact: Derek Logan, Associate professor +46 46-2221443 derek.logan(a)biochemistry.lu.se Ulf Ryde, Professor +46-2224502 ulf.ryde(a)teokem.lu.se http://www.cmps.lu.se/ http://www.teokem.lu.se/ http://www.chem.lu.se/People/galectins_in_Lund/ http://www.esss.se

1 0

Deadline: 4 February -- Please apply for RapiData 2013, a course on Data Collection and Structure Solving at the NSLS.
by Robert Sweet 04 Jan '13

04 Jan '13

We are offering RapiData 2013, the fifteenth offering of our popular course: Rapid Data Collection and Structure Solving at the NSLS: A Practical Course in Macromolecular X-Ray Diffraction Measurement The course will be held 21-26 April 2013: http://www.bnl.gov/RapiData/. Students could be at any level from advanced undergraduate to full professor. The course should accommodate 48 students total. We encourage all students to bring their own specimens for data collection, and to bring old data for the data-reduction and structure-solving tutorials. Please read the Course Announcement at http://www.bnl.gov/RapiData/. You'll see that many experts in the field will be available for lectures and tutorials. You'll find the application materials on the Course Application tab at this site. For the eleventh time we will hold a short lecture course on the fundamentals of crystallography for roughly five hours on Sunday 21 April. The body of the RapiData course really requires that students have a healthy knowledge of crystallography. For potential students who have some experience but are shaky about fundamentals, this course will help. There will be a small additional fee for the fundamentals course, to pay for Saturday night accomodations and food on Sunday morning and noon. Latin American Scientists: Several scholarships are available, from the International Union of Crystallography, to pay partial travel and subsistence costs for Latin-American students and junior faculty (under 40 yrs). Please apply for the course, and then contact R. Sweet (sweet(a)bnl.gov) if you are interested in applying for a scholarship. In accordance with the standards of the International Union of Crystallography, we observe the basic policy of non-discrimination, affirming the right and freedom of scientists to associate in international scientific activity without regard to such factors as citizenship, religion, creed, political stance, ethnic origin, race, colour, language, age, or gender, in accordance with the Statutes of the International Council for Science. At this course no barriers will exist beyond the application procedure that would prevent the participation of bona fide scientists. Please apply or send your students to our course, Bob Sweet, Sonya Kiss, and Alex Soares Course Announcement at http://www.bnl.gov/RapiData/ ========================================================================= Robert M. Sweet E-Dress: sweet(a)bnl.gov Group Leader, PXRR: Macromolecular ^ (that's L Crystallography Research Resource at NSLS not 1) http://px.nsls.bnl.gov/ Photon Sciences and Biology Dept Mail Stop, Bldg 463 Brookhaven Nat'l Lab. Phones: Upton, NY 11973 631 344 3401 (Office) U.S.A. 631 344 2741 (Facsimile) =========================================================================

1 0