June 2008 - phenixbb - phenix-online.org

PHENIX on OS X Intel 10.5 "need access to screen" error
by Ben Eisenbraun 09 Jul '08

09 Jul '08

Howdy, I have PHENIX 1.3-rc2 built on an OS X Intel 10.4 machine. It runs fine there, but using the same installation mounted via NFS, I get this error: This program needs access to the screen. Please run with 'pythonw', not 'python', and only when you are logged in on the main display of your Mac. I dug around in the program a bit to see if there was a script testing for the DISPLAY setting, but this seems to be generated in the wx-python bits: build/mac-intel-osx/base/Python.framework/Versions/2.5/lib/python2.5/site-packages/wx-2.8-mac-ansi/wx/_core.py contains the error message, as do a couple of other files in the /wx/ hierarchy. The PHENIX 1.3-rc2 I built on OS X 10.4 PPC works fine on the 10.5 PPC machines, so I'm a bit surprised it's failing on the Intel side. Does anyone know if a PHENIX built on 10.5 will work on a 10.4 machine? If it was really necessary, I could install versions built on both 10.4 and 10.5, but I'd prefer to avoid it if possible. Any insight on fixing this would be much appreciated. Thanks. -ben -- Ben Eisenbraun Structural Biology Grid Harvard Medical School http://sbgrid.org http://hms.harvard.edu

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Postdoctoral Position - Chemical Imaging of Plant Biomass with Micro- and Nano-Raman Spectroscopy
by Paul Adams 30 Jun '08

30 Jun '08

Postdoctoral Researcher Chemical Imaging of Plant Biomass with Micro- and Nano-Raman Spectroscopy Job ID: UCB-013 Institution: Energy Biosciences Institute, Berkeley California Date Opened: 5/10/2008 Position Description: Development of computational tools for the analysis of chemical imaging data. Computational construction of three- dimensional maps of plant cell wall material from Raman spectroscopy measurements. Position Responsibilities: Development of algorithms to indentify chemical species from Raman spectroscopy measurements. Processing of data to generate two-dimensional images of chemical components in plant cell wall material. Use of tomographic methods to construct three-dimensional images. Development of maximum likelihood methods to extract information from weak spectroscopic data. Position Qualifications: Strong computational skills with experience in their practical application to imaging or complex data analysis. Preference will be given to candidates with experience in the analysis of spectroscopic data or imaging of biological samples. Experience with programming languages: C/C++ and scripting languages: Python/ Perl. Demonstrated publication record in the computational analysis of data and algorithm development. Ability to work in a team environment and good communication skills. Ph.D. in physical chemistry, biology, physics, computer science or related field. See the program description for more details: http://energybiosciencesinstitute.org/index.php?option=com_content&task=vie… How to Apply: Submit a Letter of Interest, CV, and three (3) contacts for references via email to: Paul Adams Lawrence Berkeley Lab, BLDG 64R0121 1 Cyclotron Road Berkeley, CA 94720 510-486-4225 pdadams(a)berkeley.edu The University of California, Berkeley is an Equal Opportunity Employer committed to diversity in its staff, faculty, and student body, and invites all qualified people to apply, including minorities and women, veterans and individuals with disabilities. -- Paul Adams Adjunct Professor, Department of Bioengineering, U.C. Berkeley Tel: 510-486-4225, Fax: 510-486-5909 http://cci.lbl.gov/paul --

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Fwd: Re: help with refinement in Phenix
by hosur＠barc.gov.in 29 Jun '08

29 Jun '08

Hi PHENIX developers, I am forwarding herewith my correspondence with Dr. Pavel Afonine regarding a reinement issue in PHENIX. I would appreciate if other developers can help me with the solution before Pavel comes back on June 25th. Thanks. The requirement is to be able to refine a model in which a piece of electron density is interpreted as partial occupancy protein residue and a set of water molecules. Hosur M.V. ----- Forwarded message from Pavel Afonine <pafonine(a)lbl.gov> ----- Date: Sat, 14 Jun 2008 21:57:36 -0700 From: Pavel Afonine <pafonine(a)lbl.gov> Reply-To: Pavel Afonine <pafonine(a)lbl.gov> Subject: Re: help with refinement in Phenix To: hosur(a)barc.gov.in Hi Hosur, I'm out of town and not regular at email, so the delay with the answer,, sorry for this. Actually, it is the best to address your questions to phenixbb (http://www.phenix-online.org/mailman/listinfo/phenixbb) so all the PHENIX developers get it and you don't hang up with the delay if a particular person is temporarily absent. I will be back in office on June 25. Regarding your question: > In my case, the set of 4 water molecules has to have the same occupancy, and > this occupancy with the occupancy of a side chain must make up unity. That is > the sum of two occupancies must be unity. > This particular feature is currently not available in phenix.refine. I will add this option once I'm back in office. > If I understand correctly, if i identify each of the four water molecules by a > different altloc label, then the sum of 5 occupancies will be adjusted to one, > with the possibility of each water occupancy converging to different value. > Yes, this is expected behavior. > Further, the final occupancy would be close to 0.25 of the required value. The > complication, in my opinion, is because the set of four water molecules is not > like set of atoms that make one residue which can be assigned a single altloc > label. I hope I have been able to convey what I mean. Let me have the suitable > PDB, which I can try out. > Yes, this is very clear for me and like I said above I will add this feature to PHENIX as soon as I get back to office. All the best, Pavel. ----- End forwarded message ----- -------------------------------------------------

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refinement with several twins / modulated data / pseudo-translational symmetry
by iulek 29 Jun '08

29 Jun '08

Dear all, I have a strongly modulated dataset as can be observed in the truncate output below. Specially, the modulation is higher for L odd/even and at lower resolution: !!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Analysis of mean intensity by parity for reflection classes For each class, Mn(I/sig(I)) is given for even and odd parity with respect to the condition, eg group 1: h even & odd; group 7 h+k+l even & odd; group 8 h+k=2n & h+l=2n & k+l=2n or not Range Min_S Dmax Nref 1 2 3 4 5 6 7 8 h k l h+k h+l k+l h+k+l h+k,h+l,k+l 1 0.00018 20.85 519 13.2 8.9 13.9 8.2 22.3 2.4 13.3 8.9 12.5 9.6 12.9 9.0 12.6 9.5 16.5 9.2 2 0.00230 15.04 994 15.9 16.0 15.3 16.5 30.1 2.3 15.7 16.2 15.1 16.7 14.9 16.8 15.1 16.7 13.5 16.6 3 0.00442 12.36 1289 17.2 16.0 17.0 16.2 33.8 3.7 17.2 16.0 14.9 18.0 14.7 18.2 14.9 18.0 13.1 17.4 4 0.00655 10.74 1568 20.7 18.9 20.3 19.2 35.5 4.9 20.4 19.2 18.7 20.7 18.3 21.0 18.5 20.9 17.7 20.3 5 0.00867 9.63 1759 20.3 15.8 20.1 16.0 33.2 4.9 20.1 15.9 18.7 17.3 18.6 17.4 18.8 17.2 21.6 16.9 6 0.01079 8.80 2042 19.6 15.4 19.3 15.7 30.5 5.8 19.5 15.5 17.6 17.3 17.5 17.4 17.6 17.3 19.9 16.7 7 0.01291 8.15 2206 15.9 12.0 15.8 12.1 22.6 5.0 15.5 12.4 14.3 13.5 14.1 13.7 14.0 13.8 16.2 13.2 8 0.01504 7.63 2393 11.8 9.0 11.5 9.3 18.6 3.6 11.7 9.1 10.5 10.2 10.3 10.3 10.4 10.3 12.0 9.9 9 0.01716 7.20 2526 9.8 6.5 9.8 6.5 13.8 3.2 9.8 6.6 9.0 7.3 9.0 7.3 9.0 7.4 11.6 7.1 10 0.01928 6.83 2747 11.1 7.5 11.0 7.6 15.7 3.0 10.8 7.8 10.0 8.5 9.9 8.6 9.8 8.6 12.3 8.3 11 0.02141 6.52 2867 10.3 7.3 10.2 7.3 14.4 3.0 10.3 7.3 9.4 8.1 9.4 8.1 9.4 8.2 11.7 7.9 12 0.02353 6.24 3122 8.6 5.8 8.5 5.8 11.6 3.0 8.4 5.9 7.3 6.9 7.3 6.9 7.2 7.0 8.8 6.6 13 0.02565 6.00 3124 7.9 5.7 7.7 5.9 11.1 2.9 7.7 5.9 6.8 6.7 6.8 6.8 6.8 6.7 7.8 6.5 14 0.02777 5.78 3346 9.8 6.7 9.7 6.7 12.7 3.5 9.6 6.8 8.8 7.7 8.7 7.8 8.6 7.9 10.7 7.5 15 0.02990 5.59 3428 9.0 5.6 8.9 5.7 11.2 3.1 8.8 5.8 7.9 6.7 7.8 6.8 7.7 6.9 9.9 6.4 16 0.03202 5.41 3633 8.3 5.5 8.2 5.5 10.9 3.5 8.2 5.6 7.1 6.6 7.1 6.6 7.1 6.6 8.8 6.2 17 0.03414 5.25 3658 9.6 6.2 9.4 6.3 12.4 3.7 9.4 6.4 8.4 7.3 8.4 7.3 8.2 7.5 10.6 7.0 18 0.03627 5.10 3696 10.2 6.4 10.1 6.5 12.5 4.3 9.8 6.7 8.8 7.8 8.7 7.9 8.6 7.9 10.8 7.4 19 0.03839 4.97 3955 10.1 6.9 9.9 7.0 12.6 4.5 9.8 7.1 8.8 8.2 8.6 8.3 8.6 8.3 10.4 7.9 20 0.04051 4.84 3902 10.9 7.2 10.9 7.2 13.4 4.6 10.7 7.4 9.7 8.4 9.7 8.4 9.7 8.4 12.1 8.0 21 0.04263 4.73 4207 11.4 6.8 11.3 6.9 13.7 4.8 11.1 7.0 9.5 8.5 9.4 8.6 9.5 8.6 12.0 8.1 22 0.04476 4.62 4169 9.7 6.8 9.6 6.9 12.4 4.6 9.5 7.0 8.3 8.1 8.3 8.2 8.2 8.2 9.7 7.8 23 0.04688 4.52 4100 11.1 6.7 11.0 6.8 12.6 5.5 10.8 7.0 9.0 8.8 8.9 8.8 8.9 8.9 11.0 8.2 24 0.04900 4.42 4605 10.8 6.5 10.7 6.5 12.3 4.9 10.5 6.8 9.5 7.8 9.4 7.9 9.3 7.9 12.2 7.5 25 0.05113 4.33 4449 9.6 6.1 9.5 6.2 11.1 4.6 9.4 6.3 8.3 7.4 8.2 7.5 8.2 7.5 10.2 7.0 26 0.05325 4.25 4528 9.1 5.8 9.1 5.8 10.0 4.8 8.8 6.0 7.6 7.2 7.5 7.3 7.5 7.3 9.2 6.8 27 0.05537 4.17 4782 8.6 5.3 8.6 5.3 9.7 4.6 8.5 5.4 7.5 6.5 7.4 6.5 7.4 6.5 9.5 6.1 28 0.05749 4.10 4774 8.3 5.2 8.2 5.3 9.6 3.9 8.0 5.4 7.0 6.4 7.0 6.4 6.9 6.5 8.6 6.1 29 0.05962 4.02 4837 8.1 5.6 8.1 5.7 9.7 4.4 7.9 5.8 7.2 6.6 7.2 6.6 7.2 6.6 8.6 6.4 30 0.06174 3.96 5066 8.2 4.9 8.2 4.9 8.9 4.2 8.0 5.1 6.9 6.2 6.8 6.2 6.7 6.3 8.6 5.8 31 0.06386 3.89 4954 7.4 4.7 7.3 4.8 7.9 4.1 7.2 4.9 6.2 5.9 6.1 6.0 6.2 5.9 7.5 5.6 32 0.06599 3.83 5052 7.6 4.6 7.6 4.6 8.2 4.0 7.4 4.8 6.4 5.8 6.4 5.8 6.3 5.9 8.0 5.5 33 0.06811 3.77 5159 6.9 4.4 6.8 4.5 7.2 4.0 6.6 4.6 5.8 5.4 5.7 5.5 5.6 5.6 6.9 5.2 34 0.07023 3.72 5226 6.7 4.1 6.7 4.2 7.2 3.8 6.6 4.2 5.6 5.2 5.6 5.2 5.6 5.2 7.0 4.9 35 0.07236 3.66 5359 6.6 4.1 6.6 4.2 6.7 4.1 6.4 4.4 5.4 5.3 5.4 5.3 5.3 5.4 6.6 5.0 36 0.07448 3.61 5293 6.4 3.9 6.3 3.9 6.9 3.5 6.2 4.1 5.4 4.8 5.4 4.9 5.4 4.8 6.7 4.6 37 0.07660 3.56 5633 6.7 4.4 6.7 4.4 7.4 3.7 6.6 4.5 5.8 5.3 5.7 5.4 5.7 5.4 7.0 5.1 38 0.07872 3.52 5479 5.9 3.8 5.9 3.8 6.2 3.6 5.8 3.9 5.0 4.7 5.0 4.7 5.0 4.7 6.1 4.5 39 0.08085 3.47 5578 5.2 3.3 5.2 3.3 5.4 3.1 5.0 3.5 4.4 4.0 4.4 4.0 4.3 4.1 5.4 3.8 40 0.08297 3.43 5580 5.3 3.3 5.3 3.3 5.3 3.3 5.2 3.4 4.6 4.0 4.6 4.1 4.6 4.1 5.8 3.8 41 0.08509 3.39 5936 5.3 3.3 5.3 3.2 5.4 3.2 5.1 3.4 4.5 4.0 4.5 4.0 4.4 4.1 5.5 3.8 42 0.08722 3.35 5783 4.7 3.0 4.7 3.0 4.5 3.3 4.6 3.1 3.9 3.8 4.0 3.8 3.9 3.8 4.8 3.6 43 0.08934 3.31 5889 4.4 3.0 4.4 2.9 4.5 2.9 4.3 3.1 3.8 3.6 3.8 3.5 3.7 3.6 4.5 3.4 44 0.09146 3.27 5966 4.4 2.8 4.5 2.8 4.5 2.8 4.3 2.9 3.8 3.5 3.8 3.5 3.8 3.5 4.7 3.3 45 0.09358 3.23 6145 4.0 2.6 4.0 2.6 4.1 2.5 3.9 2.8 3.5 3.2 3.5 3.2 3.5 3.2 4.2 3.0 46 0.09571 3.20 6202 3.6 2.3 3.7 2.3 3.6 2.3 3.6 2.4 3.2 2.8 3.2 2.7 3.2 2.7 4.0 2.6 47 0.09783 3.16 6042 3.7 2.3 3.8 2.2 3.5 2.5 3.7 2.3 3.1 2.9 3.1 2.9 3.1 2.9 4.0 2.7 48 0.09995 3.13 6198 3.5 2.2 3.5 2.1 3.3 2.4 3.4 2.2 2.9 2.8 2.9 2.8 2.9 2.8 3.6 2.6 49 0.10208 3.10 6421 3.3 2.1 3.3 2.1 3.1 2.3 3.2 2.1 2.7 2.6 2.7 2.6 2.7 2.6 3.4 2.4 50 0.10420 3.07 6403 3.2 2.2 3.3 2.1 3.1 2.3 3.2 2.2 2.8 2.6 2.8 2.6 2.8 2.6 3.3 2.5 51 0.10632 3.04 6357 2.9 2.0 3.0 1.9 2.8 2.1 2.9 2.0 2.6 2.4 2.6 2.3 2.6 2.4 3.1 2.2 52 0.10844 3.01 6389 2.6 1.9 2.6 1.9 2.6 2.0 2.6 1.9 2.4 2.2 2.4 2.2 2.3 2.2 2.8 2.1 53 0.11057 2.98 6580 2.8 1.9 2.8 1.9 2.7 2.0 2.8 2.0 2.5 2.3 2.4 2.3 2.4 2.3 2.9 2.2 54 0.11269 2.95 6663 2.8 1.9 2.8 1.8 2.7 1.9 2.7 1.9 2.5 2.1 2.5 2.1 2.5 2.1 3.1 2.0 55 0.11481 2.92 6582 2.6 1.9 2.7 1.8 2.6 1.9 2.6 1.9 2.4 2.1 2.4 2.1 2.4 2.1 2.9 2.0 56 0.11694 2.90 6572 2.6 1.8 2.6 1.8 2.5 1.9 2.6 1.8 2.3 2.1 2.3 2.1 2.3 2.1 2.7 2.0 57 0.11906 2.87 6820 2.4 1.7 2.4 1.7 2.3 1.8 2.4 1.8 2.1 2.0 2.1 2.0 2.1 2.0 2.5 1.9 58 0.12118 2.85 6970 2.3 1.6 2.3 1.6 2.2 1.8 2.3 1.6 2.0 1.9 2.0 1.9 2.0 2.0 2.3 1.8 59 0.12330 2.82 6717 2.4 1.7 2.5 1.6 2.2 1.8 2.4 1.7 2.0 2.0 2.0 2.0 2.0 2.0 2.4 1.9 60 0.12543 2.80 5677 2.1 1.6 2.1 1.6 2.0 1.7 2.0 1.6 1.8 1.8 1.8 1.8 1.8 1.8 2.0 1.8 Totals: 277916 6.4 4.3 6.4 4.3 7.6 3.2 6.3 4.4 5.5 5.2 5.5 5.2 5.5 5.2 6.6 4.9 !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! As you can imagine, I have pseudo-translation peaks , the strongest at 48 % height (of the origin peak) at 0.0 0.0 0.5, other two at ~ 30 % height at 0.0 0.5 0.0 and 0.5 0.0 0.0 (and so at 0.5 0.0 0.5, etc.). The cell is large, 229 229 72 90 90 120, data processed at several space group options with good statistics; the highest symmetry is P622. With much struggle, some solutions from molecular replacement came out. Basically, the monomers (~274 residues each) makes "strings" (pack of one monomer over the other in one dimension), then these strings seem to be able to pack themselves in parallel (within them there must be an up/down feature) and parallel to the shorter cell axis. Given the cell dimensions, it seems most probable that I have 48 mol/au, although I cannot discard 36 mol/au (or even something between, depending upon the symmetry). I attach a picture of the supposed pack in case of 48 mol/au, viewed down to the 120 angle. The packing has made me practically rule out space groups P622 and P312, yet the need for a 2-fold axis passing through both 0, 1, 0 and 1, 0 0. Whenever I process the data in a lower space group, xtriage suggests strongly twinning, and close to 50 % in almost any operation. Also, whatever space group I choose for refinement, the results are all some how alike, R-free stucks (with any twinning operation that I can use to refine) at about 40/41 %; non-twinned refinement stucks R-free around 48 %. The investigated space groups include P321, P6, P3, P2, C222, C2 and P1 (besides, of course, at the beginning, P622 and P312), with several combinations of molecules/au (I there might be screw axes, although no systematic absences). With P1, I have the lowest reason between R and R-free (because R is higher). I must add that I have already tested some refinement alternatives, such as bulk solvent models, fix these, etc., but of course not all alternatives. Much information has been produced; one other highlight I think is the fact that most of the time atomic B-factors are refined to the ground, I suppose because of the abnormal intensity distribution/data modulation. I have a couple of questions and other information which I prefer to number since from now. a) Is there a source of information for refinement of such modulated data? Or previous cases reported in the literature? b) I have not tried yet P1 with 48 molecules. I run out of chain ID's, what does phenix accept besides the alphabet and 0-9? c) For P3, with any of the 3 twin operators the result is practically the same. To my knowledge, only shelxl can deal, currently, with more that one twinned domain, but these can only be produced in a iterative fashion. So, what might be the other way round? Is this development expected for phenix? For P1, I would have 11 pseudo-merohedral twin operations... I think the kind of packing is quite prone to twinning. d) Concerning what is raised in c, how necessary is to combine the 3 possible twin operators with the 3 reindexing possibilities.... e) How can I convince phenix to use the suggested twin operation 1/2*h-1/2*k,3/2*h+1/2*k,l in C222 (and some others with the * symbol in C2)? Much more information is available; I think I could pick the main ones. Thanks for any help. Jorge

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Error when specifying anomalous scatterers in autosol.
by Francis E Reyes 27 Jun '08

27 Jun '08

------------------------------------------------------------ Starting AutoSol with the command: phenix.autosol data=ScalAveragedSG_76_30.ref seq_file=seq_from_pdb.dat \ refine_eff_file_list=./refinement/non_default.eff sites=2 atom_type=I \ f_prime=-0.582314 f_double_prime=6.84299 res_phase=3.4 resolution_build=3.0 \ resolution=3.0 wavelength=1.5418 ha_sites_file=./ha_sites.pdb Sending output to AutoSol_run_7_/AutoSol_run_7_1.log ******************************************************************************** Failed to carry out AutoSol_build: Refinement failed...perhaps something wrong with input refinement file or data file or the column labels for them? Error message from phenix.refine: Empty atom selection: refinement.refine.anomalous_scatterers.group.selection="name I" ******************************************************************************** Cuts out in the first round of refinement (after initial Build_1.pdb) . I guess I should not have specified anomalous scatterers (at least to autosol). Does it refine anomalous automagically in the autobuild when doing a SAD via autosol? How do I recover from this error? (continue with the autobuild without anomalous scattering it now seems). Thanks FR --------------------------------------------- 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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Twinnig
by Michael Gorman 26 Jun '08

26 Jun '08

Dear all, After over 15 years solving structures I have (knowingly) encountered my first twinned data set. Short history.. Processed synchrotron data with HKL2000 SG P 42 21 2 ( Cell 105.485, 105.485, 62.445, 90, 90, 90) Rmerge 6% to 2A Solved MR using Phaser ( 1 mol in ASU) and built using COOT Refined using Phenix to a 'final' Rwork 29.4% Rfree 31.7% The maps look good but not great. Spurious peaks in difference maps. Couldn't get R's down any further. Xtriage suggested 'Overmerging pseudo-symmetric or twinned data' Re-processed in P2 ( cell 105.299, 62.385, 105.548, 90, 90.021, 90) Two molecules in ASU Xtriage suggested the presence of 3 pseudo-merohedral twin operators (one 4-fold and two 2-folds) Refined with twin law h,-k,-l (one of the pseudo 2-folds) using Phenix Rwork 26% Rfree 28% (no further building carried out at the moment) Wondered if it was a higher space group so.... re-processed in P222 (again Rmerge 6% to 2A) and did MR with Phaser in all the alternative space groups. The highest LL-gain was for P 21 21 21 (cell 62.377 105.297 105.546 90 90 90) I re-processed the data in P 21 21 21, all the systematic absences looked 'absent'. Xtriage suggested the presence of only one 4-fold Pseudo-merohedral twin law h,l,-k, R obs 5.1% Simulated annealing and ADP refinement in Phenix with twin law h,l,-k gave Rwork 33% Rfree 40%. Here are my questions... 1) Should I go for P2 due to the low R-factors and build from my good model ( beta angle of 90.021 seems unlikely ) 2) Should I try other possible SG ( HKL2000 suggested, primitive tetragonal, primitive orthorhombic, C centred orthorhombic, and monoclinic). 3) I'm concerned that my free-R reflections will be screwed-up since I have pseudo-merohedral twinning and some Rwork reflections may be the same as Rfree ones. I have read that Phenix is rather clever and chooses the highest observed symmetry to ovoid this problem but I can't see it being reported in the log-file that, in the case of P2, pseudo P42 21 2 is used for Rfree calculations. All help is much appreciated Mike -- Michael Gorman PhD St. Vincent's Institute of Medical Research 9 Princes Street Fitzroy Victoria 3065 Australia Tel : (03) 9288 2519

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Re: [phenixbb] Rfree increases during ordered solvent filtering
by Jennifer L Ekstrom 25 Jun '08

25 Jun '08

Hi Pavel, Thanks. I don't believe that is the cause of this refinement anomaly. If I run the same job without the filter_only option, I am still seeing a very large jump in R/Rfree at the ordered solvent location/analysis/update step (before 2_xyz). ordered_solvent=true 0 : 0.1564 0.1709 2.905699e+00 3.076326e+00 1_bss: 0.1145 0.1431 2.837441e+00 3.027552e+00 1_xyz: 0.1159 0.1433 2.846219e+00 3.029651e+00 1_adp: 0.1159 0.1433 2.846219e+00 3.029651e+00 1_occ: 0.1155 0.1429 2.844726e+00 3.028603e+00 2_bss: 0.1154 0.1427 2.844702e+00 3.028393e+00 2_xyz: 0.1313 0.1555 2.950732e+00 3.111378e+00 2_adp: 0.1307 0.1543 2.945031e+00 3.101981e+00 2_occ: 0.1306 0.1542 2.945015e+00 3.101954e+00 3_bss: 0.1301 0.1538 2.944930e+00 3.101580e+00 3_xyz: 0.1312 0.1565 2.951306e+00 3.117549e+00 3_adp: 0.1306 0.1546 2.940355e+00 3.100448e+00 3_occ: 0.1305 0.1546 2.940347e+00 3.100439e+00 3_bss: 0.1292 0.1534 2.940856e+00 3.100060e+00 However, if I run this job with no ordered solvent manipulation, the R/Rfree are stable at their previous lower value. ordered_solvent=false 0 : 0.1564 0.1709 2.905699e+00 3.076326e+00 1_bss: 0.1145 0.1431 2.837441e+00 3.027552e+00 1_xyz: 0.1159 0.1433 2.846219e+00 3.029651e+00 1_adp: 0.1159 0.1433 2.846219e+00 3.029651e+00 1_occ: 0.1155 0.1429 2.844726e+00 3.028603e+00 2_bss: 0.1154 0.1427 2.844702e+00 3.028393e+00 2_xyz: 0.1151 0.1427 2.842538e+00 3.027628e+00 2_adp: 0.1151 0.1427 2.842538e+00 3.027628e+00 2_occ: 0.1151 0.1427 2.842433e+00 3.027654e+00 3_bss: 0.1151 0.1426 2.842430e+00 3.027578e+00 3_xyz: 0.1156 0.1428 2.846107e+00 3.029162e+00 3_adp: 0.1156 0.1428 2.846106e+00 3.029160e+00 3_occ: 0.1156 0.1429 2.846122e+00 3.029225e+00 3_bss: 0.1156 0.1429 2.846122e+00 3.029225e+00 I wouldn't expect to see a 1% jump in Rfree after minor tweaking of a few dozen waters. This is not a small structure. There must be something strange in the refinement protocol during the ordered water treatment. I had thought it could be a weighting issue, but subsequent refinement with optimization of wxc and wxu does not bring the R/Rfree down to the original range. Thanks, Jennifer (Running version 2008_05_03_2330) ................................................... Pavel Afonine writes: > Hi Jennifer, > > you are using "ordered_solvent.mode=filter_only". This means that the new > waters are not added but the existing ones are filtered (removed) at final > step based on selection criteria (B-factors, distances, H-bonding, > etc...). Do you really want this? If not, then do not use > "ordered_solvent.mode=filter_only" (the default is "auto" which is good in > most of cases). > > Please let me know if you have any questions! > > Pavel. > > > On 6/24/2008 2:42 PM, Jennifer L Ekstrom wrote: >> I am running phenix.refine (version 2008_05_03_2330) with the >> command-line options ordered_solvent=true >> ordered_solvent.mode=filter_only >> >> During the final step (3_bss), my R and Rfree increase significantly. >> Any thoughts on why this jump would occcur? Per the notations in the >> logfile, only 30 waters were removed in the final model. >> >> Thanks, Jennifer >> >> >> R-factors, x-ray target values and norm of gradient of x-ray target >> stage r-work r-free xray_target_w xray_target_t >> 0 : 0.1564 0.1709 2.905699e+00 3.076326e+00 >> 1_bss: 0.1145 0.1431 2.837441e+00 3.027552e+00 >> 1_xyz: 0.1159 0.1433 2.846219e+00 3.029651e+00 >> 1_adp: 0.1159 0.1433 2.846219e+00 3.029651e+00 >> 1_occ: 0.1155 0.1429 2.844726e+00 3.028603e+00 >> 2_bss: 0.1154 0.1427 2.844702e+00 3.028393e+00 >> 2_xyz: 0.1151 0.1427 2.842538e+00 3.027628e+00 >> 2_adp: 0.1151 0.1427 2.842538e+00 3.027628e+00 >> 2_occ: 0.1151 0.1427 2.842433e+00 3.027654e+00 >> 3_bss: 0.1151 0.1426 2.842430e+00 3.027578e+00 >> 3_xyz: 0.1156 0.1428 2.846107e+00 3.029162e+00 >> 3_adp: 0.1156 0.1428 2.846106e+00 3.029160e+00 >> 3_occ: 0.1156 0.1429 2.846122e+00 3.029225e+00 >> 3_bss: 0.1306 0.1512 2.943092e+00 3.079441e+00 >> >> >> _______________________________________________ >> phenixbb mailing list >> phenixbb(a)phenix-online.org >> http://www.phenix-online.org/mailman/listinfo/phenixbb >> >

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PI Position @ SGC-Oxford: Integral Membrane Proteins
by Frank von Delft 25 Jun '08

25 Jun '08

Hi, any ambitious membrane protein researchers, please read about the vacancy below. Thanks, phx We are seeking a Principal Investigator to lead the Integral Membrane Protein (IMP) group of the Structural Genomics Consortium (SGC), Oxford. The SGC is a charity organization that includes ~200 researchers in laboratories in the universities of Oxford, Toronto and the Karolinska Institute. Our goal, successfully pursued since 2004, is to solve structures of medically relevant human proteins and deposit them immediately in public databases. We further exploit our target proteins in downstream studies with special emphasis on Chemical Biology, using both our in-house infrastructure and a network of collaborators. In the last year, our efforts have expanded to human integral membrane proteins. The present PI of the IMP group is leaving, and we are seeking a replacement with demonstrated experience and publication record in structural biology of membrane proteins. The IMP group comprises ~8 people, and is additionally supported by the SGC's extensive infrastructure, with close collaborations with molecular biologists, crystallographers, biophysicists and informaticians in the other groups. Currently funded until 2011, the post offers an unrivalled opportunity to develop a strong research program and a reputation as a group leader. More details are available at the following links: http://www.sgc.ox.ac.uk http://www.sgc.ox.ac.uk/jobs/H908014.html

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group_adp default ? and other phenix questions?
by hari jayaram 24 Jun '08

24 Jun '08

Hi I quite new to the phenix environemnt and just ran a phenix refinement with the following command line *phenix.refine myfile.mtz mymodel.pdb simulated_annealing=true model.ncs refinement.main.ncs=true --overwrite refinement.ncs.excessive_distance_limit=None >phenix_06_18_2008_2.log * The model.ncs file is structured as follows refinement.ncs.restraint_group { reference = chain A selection = chain B selection = chain C selection = chain D } My data is good to 3.3 A ( membrane protein) and thus far I have been refining with refmac5. After the phenix run indicated above, I had a dramatic reduction in r/rfree ( post refmac 33/36 AND post phenix 28/31). This is despite relatively small changes to my model by the simulated annealing refinement. I have a few questions about the process and am hoping some phenix veterans can help me out. 1) At my resolution I guess I should at best be refining only one B-factor / ADP per residue is this the default behavior with the command line above 2) I have seen the emails about syntax for forcing group-B refinement at this location<http://www.phenix-online.org/pipermail/phenixbb/2007-March/000161.html>and this one<http://www.phenix-online.org/download/documentation/cci_apps/structure_refi…>. Basically they use strategy=group_adp . I am imagining this calculates one ADP per residue or per defined group. In my case if I force the behavior with the syntax , how is group ADP for NCS-mates handled? 3) On a general note , when I say phenix.refine --show-defaults , the section on strategy has a long list, what do the asterisks (*) in the syntax mean .Does that mean those are the defaults . Also how can I infer the syntax from this hierarchy? Sorry for the long list of questions but I am very happy with phenix and just thought I should understand the syntax better. Thanks for your help Hari Jayaram Attachments: phenix.refine --show-defaults returns refine { strategy = *individual_sites rigid_body *individual_adp group_adp tls \ individual_occupancies group_occupancies group_anomalous sites { individual = None rigid_body = None } adp { individual { isotropic = None anisotropic = None } group = None one_adp_group_per_residue = True tls = None }

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How to generate an anomalous map in PHENIX?
by Schubert, Carsten [PRDUS] 24 Jun '08

24 Jun '08

Hi, I am trying to make an anomalous map in the latest phenix. After refinement of a medium resolution structure (1.8A) with anomalous data (and signal) I used the ANOM and PHANOM columns in the map_coeffs.mtz file to generate a map. The map was created either in coot or via fft, but shows no anomalous peaks for a present Cl1 nor for SS bonds. It rather mimics a noisy protein map. Generation of an anomalous map in CNX using the same data (FOBS(+/-) and HL coeffs(calc) ) produces a nice map with the expected peaks. Am I misunderstanding the purpose of the ANOM/PHANOM columns or is this feature not implemented yet. Cheers Carsten

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Rfree increases during ordered solvent filtering
by Jennifer L Ekstrom 24 Jun '08

24 Jun '08

I am running phenix.refine (version 2008_05_03_2330) with the command-line options ordered_solvent=true ordered_solvent.mode=filter_only During the final step (3_bss), my R and Rfree increase significantly. Any thoughts on why this jump would occcur? Per the notations in the logfile, only 30 waters were removed in the final model. Thanks, Jennifer R-factors, x-ray target values and norm of gradient of x-ray target stage r-work r-free xray_target_w xray_target_t 0 : 0.1564 0.1709 2.905699e+00 3.076326e+00 1_bss: 0.1145 0.1431 2.837441e+00 3.027552e+00 1_xyz: 0.1159 0.1433 2.846219e+00 3.029651e+00 1_adp: 0.1159 0.1433 2.846219e+00 3.029651e+00 1_occ: 0.1155 0.1429 2.844726e+00 3.028603e+00 2_bss: 0.1154 0.1427 2.844702e+00 3.028393e+00 2_xyz: 0.1151 0.1427 2.842538e+00 3.027628e+00 2_adp: 0.1151 0.1427 2.842538e+00 3.027628e+00 2_occ: 0.1151 0.1427 2.842433e+00 3.027654e+00 3_bss: 0.1151 0.1426 2.842430e+00 3.027578e+00 3_xyz: 0.1156 0.1428 2.846107e+00 3.029162e+00 3_adp: 0.1156 0.1428 2.846106e+00 3.029160e+00 3_occ: 0.1156 0.1429 2.846122e+00 3.029225e+00 3_bss: 0.1306 0.1512 2.943092e+00 3.079441e+00

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Phenix / Resolve build related..
by Partha Chakrabarti 24 Jun '08

24 Jun '08

Hi, Sorry for the slightly off the topic question. I have a three wavelength SE MAD data to 3A, which I could only solve using SHARP or BP3. It seemed to have two monomers and each having one ordered SE sites. Found the NCS using RAVE programs, AVE, NCS6d and IMP. I am wondering if it is possible to give the NCS matrix (transposed from O format) and somehow tell Resolve (or Autobuild) to build multiple chains.. in this case, a homodimer. Do I need to duplicate the sequence? Regards, Partha -- MRC National Institute for Medical Research Division of Molecular Structure The Ridgeway, NW7 1AA, UK Email: pchakra(a)nimr.mrc.ac.uk Phone: + 44 208 816 2515

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NCS
by john kryst 24 Jun '08

24 Jun '08

Hi all !! What is the NCS restrain energy used by default in phenix... like CNS can we restarain 100kcal/mol.... Thanks regards John

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COURSE ANNOUNCEMENT - BIOCRYS2008 - REMINDER
by Daniele de Sanctis 24 Jun '08

24 Jun '08

On behalf of the organizers, Maria Armenia Carrondo and Thomas R. Schneider COURSE ANNOUNCEMENT - BIOCRYS 2008 Fundamentals of Modern Methods in Biocrystallography - 'What you always wanted to know about crystallography but never dared to ask' http://biocrys.itqb.unl.pt 4th - 11th October 2008 at the Instituto de Tecnologia Química e Biológica, Oeiras, Portugal. The topics of the second edition of this course will run from fundamentals such as symmetry, point groups and crystal systems, basic diffraction physics, reciprocal space and the Ewalds sphere, radiation damage, data processing, structure factors, Patterson function to modern methodologies including molecular replacement, SAD, MAD, MIR and maximum likelihood phasing, density modification, refinement, model building, twinning and structure validation. The course will be organized with lectures in the mornings and interactive practicals and tutorials in the afternoons. Evening lectures on current topics will be presented by the invited speakers. Instructors and speakers (confirmed): M. Archer, I. Bento, N. Berrow, G. Bunkoczi, M. Coll, K. Cowtan, Z. Dauter, D. de Sanctis, P. Donner, C. Frazão, E. Garman, C. Hermes, E. Hough, G. Leonhard, A. Leslie, P. Matias, A. Perrakis, T. Schneider, C. Vonrhein. 36 participants will be selected with preference to scientists at the beginning of their crystallographic career and to those from Europe. A registration fee of 500 Euro for academic and of 1000 Euro for not academic applicants is requested for full board and accommodation. Selected applicants will have to pay the registration fee by bank transfer before arrival. A very limited number of grants may be available to partially cover the registration fees and will be paid upon students arrival. For application, please please fill the form on the web page http://www.embl-hamburg.de/workshops/2008/BIOCRYST08/ by the 15th of July For more information visit the course web page http://biocrys.itqb.unl.pt -- Daniele de Sanctis, PhD Homo sum humani nil alienum a me puto ______________________________________________________________ phone ++ 351 21 4469 662 fax ++ 351 21 4433 664 e-mail de.sanctisd(a)gmail.com, sanctis(a)itqb.unl.pt Mailing address: ITQB, Av. República, Apartado 127 2781-901 Oeiras Portugal

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Problem running phenix.autobuild version 1.3-rc2
by Terry Lang 23 Jun '08

23 Jun '08

Hey Everyone, We just upgraded to the newest version of PHENIX and are now having some problems running autobuild. The command we are running is: phenix.autobuild data=061908.mtz seq_file=mydata.dat model=062308polyser.pdb sg=p212121 When we run this command file with version 1.3b-rc6, the calculation runs to completion. However, when we run version 1.3-rc2, we get the following error message: ******************************************************************************************************* Failed to carry out AutoBuild_build_cycle: child process stderr output: command: 'csh /nfs/berger/allyn/elsa/062308ab/AutoBuild_run_1_/TEMP0/RUN_FILE_1' Word too long. ******************************************************************************************************* We have also tried running from the top-level directory to make the path name shorter, but still get the same error. Has anyone else experienced a similar problem? If so, what is the best way to address it? Please let me know if you need additional information. Sincerely, Terry -- P. Therese Lang Postdoctoral Scholar Alber Lab, UC Berkeley

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Switching refinement to higher resolution
by Francis E Reyes 19 Jun '08

19 Jun '08

Hello all, I was previously refining a structures used phased (mlhl) refinement at 3.4. My dataset has a resolution range up to 2.5. The I/sig is still good at 3.0A. I tried changing the resolution cut off in the refinement .def file refinement.xray_data.high_resolution to 3.0, but I now get the error: Sorry: R-free flags not compatible with F-obs array: missing flag for 1 F-obs selected for refinement. Any advice? thanks FR --------------------------------------------- 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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cif mods, .def, .cifs...
by Bryan W. Lepore 18 Jun '08

18 Jun '08

using phenix 1.3b rc6 cctbx_tag 2007_11_18_2203 have a few questions : 1. can .cif modifications such as refinement.pdb_interpretation.apply_cif_modification { data_mod = 5pho residue_selection = resname GUA and name O5T } (from http://www.phenix-online.org/documentation/refinement.htm#anch281 ) be copy/pasted into the .def file so a .params file doesn't have to be given on the command line? i.e. can't _everything_ go in the .def? 2. in the example where it says "data_mod_5pho" at the top of the .cif file, is phenix looking for a file - .pdb, .params, .. - with that prefix? 3. in "data_mod = 5pho", does 5pho come from 5pho.cif? and it still needs to be on the command line? -bryan

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Ordered Solvent in phenix-1.3-rc2
by Mary Fitzgerald 11 Jun '08

11 Jun '08

I just installed the new version of of Phenix and I'm trying to use ordered solvent. I have a twinned, 3 A data set of about a 0.5 kDa protein, two in the asu. The job keeps dying during the ordered solvent, it says killed in the window the process was ran from. I think I might be running out of memory. I tried phenix refine without the ordered solvent and it didn't crash. How can I tell if it's a memory problem or a problem with the program? Thanks, Mary Mary X. Fitzgerald Postdoctoral Associate Arnold Lab

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Re: [phenixbb] constraining alpha-helical geometry in phenix
by Ralf W. Grosse-Kunstleve 10 Jun '08

10 Jun '08

Hi Pascal, > I am currently refining a structure at moderate resolution (~3.4A) > which is mainly composed of alpha-helices . Is there a way to > constrain the backbone geometry of the alpha helical regions in the > model used for refinement. Luca Jovine has kindly contributed a perl script that converts HBPLUS output to phenix geometry_restraints.edits. You can find it here: http://www.phenix-online.org/contrib/hbplus2phenix_restraints.pl We don't have much practical experience with this approach yet, other that it works at a technical level. If you get a chance to try it out, we'd be interested to know how much it helps in your case. Ralf

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After 25 years: photos from the 1983 Crystallographic Computing School on the web
by Ralf W. Grosse-Kunstleve 10 Jun '08

10 Jun '08

For those interested in the history of Crystallographic Computing, the 1983 Crystallographic Computing School, organised by Prof. Sydney Hall and Prof. Tamaichi Ashida, was held in Kyoto, Japan at the same site as the upcoming IUCr Crystallographic Computing School: the Kansai Seminar House. Thanks to Prof Atsushi Nakagawa, pictures of that 1983 Computing School are now on the IUCr Computing Commission website at: http://www.iucr.org/iucr-top/comm/ccom/1983school/ Many "young" faces can be seen in the album. The album includes not only the School itself but also the excursion to Nara and the Institute for Protein Research at Osaka University. Information, including program and registration on the upcoming IUCr Crystallographic Computing School 2008 * Sharing our knowledge * Kyoto, Japan, August 18-23 - is available on the school webpage: http://www.iucr.org/iucr-top/comm/ccom/kyoto2008/

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xtriage crash - what to do?
by Martin Moche 09 Jun '08

09 Jun '08

Dear Phenix developers, I got a crash when running phenix xtriage on a mtz-file in P3112. Error message below: The logfile prior to the crash is attached. Best regards, Martin ############# Error message ################ Traceback (most recent call last): File "/net/fileserver/xtal/phenix-1.3b-rc4/mmtbx/mmtbx/command_line/xtriage.py", line 7, in <module> xtriage.run(args=sys.argv[1:]) File "/net/fileserver/xtal/phenix-1.3b-rc4/mmtbx/mmtbx/scaling/xtriage.py", line 725, in run plot_out = string_buffer ) File "/net/fileserver/xtal/phenix-1.3b-rc4/mmtbx/mmtbx/scaling/xtriage.py", line 383, in __init__ additional_parameters=self.params.scaling.input.parameters.misc_twin_parameters) File "/net/fileserver/xtal/phenix-1.3b-rc4/mmtbx/mmtbx/scaling/twin_analyses.py", line 2380, in __init__ out=out, verbose=verbose) File "/net/fileserver/xtal/phenix-1.3b-rc4/mmtbx/mmtbx/scaling/twin_analyses.py", line 425, in __init__ self.show(out) File "/net/fileserver/xtal/phenix-1.3b-rc4/mmtbx/mmtbx/scaling/twin_analyses.py", line 596, in show self.suggest_new_space_groups(out=out) File "/net/fileserver/xtal/phenix-1.3b-rc4/mmtbx/mmtbx/scaling/twin_analyses.py", line 450, in suggest_new_space_groups tmp_space_group = sgtbx.space_group_info( str(tmp_space_group), space_group_t_den=t_den) File "/net/fileserver/xtal/phenix-1.3b-rc4/cctbx/cctbx/sgtbx/__init__.py", line 61, in __init__ space_group_symbols=symbols, t_den=space_group_t_den) RuntimeError: cctbx Internal Error: /net/longnose/scratch1/phenix/phenix-1.3b-rc4/cctbx/sgtbx/change_of_basis_op.cpp(70): CCTBX_ASSERT(c_.t().den() % s.t().den() == 0) failure. __________________________________________________ Martin Moche, Ph.D., M.Sc. Senior scientist Karolinska Institutet MBB/SGC Scheeles väg 2 171 77 Stockholm Sweden Phone: +46-8-524 868 43 Mob: +46-733-229327 Fax: +46-8-524 868 68 Martin.Moche(a)ki.se

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disulfides and .defs, maybe custom geom.
by Bryan W. Lepore 08 Jun '08

08 Jun '08

i can start phenix with new .pdb/.mtz, and custom geometry with satisfactory output. problem is, when i provide that output .def file (possibly w/ custom geometry in it) on the command line, phenix always sets up disulfides when it didn't before: Number of disulfides: simple=4, symmetry=0 Simple disulfide: " SG CYS A 14 " - " SG CYS A 14 " distance=0.10 Simple disulfide: " SG CYS A 140 " - " SG CYS A 140 " distance=0.08 Simple disulfide: " SG CYS A 144 " - " SG CYS A 144 " distance=0.54 Simple disulfide: " SG CYS A 147 " - " SG CYS A 147 " distance=0.18 Custom bonds: Sorry: More than one atom selected: "chain A and resname CYS and resid 140 and name SG" Number of selected atoms: 2 my ligands are attached to the cysteines, so i suspect some trouble here but can't see it - shouldn't be a problem, right? if i set disulfide_distance_cutoff= 1.0 or less, phenix drives the system into swap. any pointers, appreciated. -bryan

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effect of solvent fraction on density modification/solvent flattening for a membrane protein
by Pascal EGEA 08 Jun '08

08 Jun '08

Dear All, This is a question about the effect of solvent fraction estimation on the quality of the initial phases. I am trying to solve the structure of a membrane protein at moderate resolution 3.5A from a MAD data set (peak, inflection and high energies). I have one copy of my complex which gives me a solvent fraction of 0.7 without considering the contribution of the detergent. With a related molecule I found a Phaser-MR solution but it does not refine although it is right. I am using Phenix with the phases obtained from molecular replacement and combining them with the MAD signal to locate the seleniums. A visual inspection of the anomalous fourier difference map shows 6 sites out of the 7 expected at 4sigma contouring. If I let Phenix decide by itself it goes on its own with two copies in the ASU and considers a solvent fraction of 0.50; then it finds 7 sites (and not 14 ? why is that?) (the seventh is weak but we expect this for this region of the complex). now if I force Phenix to take ncs_copies=1 and solvent fraction=0.7 then it only find 6 sites. Wether it is 2 "freely chosen" molecules/ASU and 0.5 of solvent or 1 "forced" molecule/ASU and 0.7 of solvent, the 6 first sites are identical (although occupancies are quite higher in the first case) Should I take into account the detergent and lower somewhat my solvent fraction (in the 0.6 range maybe) with the fixed one copy ASU estimation or just trust Solve/Resolve when it runs the density modification part. Does it really affect the quality of the phasing? Between these two extremes I am surprised to see that the quality of the resolve map are quite similar apparently showing clear new structural features. Thanks in advance for your comments, Pascal F. Egea, PhD Post Doctoral Researcher University of California San Francisco Department of Biophysics and Biochemistry Robert Stroud Laboratory pascal(a)msg.ucsf.edu

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OS X source install relocatable?
by Ben Eisenbraun 05 Jun '08

05 Jun '08

Howdy, I'm doing an install from source on Mac OS X from the latest Phenix source packages. We install everything on an NFS mount so we can share it out to the workstations, so it's a little different than most OS X installs I suspect. Anyway, the installer was failing like this: (from the top level source directory) ./install --prefix=/programs/i386-mac/phenix/1.3-rc2 Which was getting me: configuring python compiling python csh: /programs/source/phenix/1.3-rc2/osx86/phenix-installer-1.3/bin/check_lib: No match. installation of python failed problem building main python library Looking at bin/install-from-source, it was failing on line 482: set py_lib = `$PHENIX_TAR/bin/check_lib $PHENIX_BUILD/base/Python.Framework/Versions/Current/lib/python*/config python` The reason for the failure is that the python framework installs with a lower case 'f': /programs/i386-mac/phenix/1.3-rc2/phenix-1.3-rc2/build/mac-intel-osx/base/Python.framework/ On a default HFS+ volume, which is case insensitive, this works just fine, but it fails when you try to install on a case-sensitive volume. Editing bin/install-from-source and :%s/Python.Framework/Python.framework/g seems to have fixed the build problem. -ben -- Ben Eisenbraun Structural Biology Grid Harvard Medical School http://sbgrid.org http://hms.harvard.edu

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constraining alpha-helical geometry in phenix
by Pascal EGEA 05 Jun '08

05 Jun '08

Dear All, I am currently refining a structure at moderate resolution (~3.4A) which is mainly composed of alpha-helices . Is there a way to constrain the backbone geometry of the alpha helical regions in the model used for refinement. Many Thanks, Pascal F. Egea, PhD Post Doctoral Researcher University of California San Francisco Department of Biophysics and Biochemistry Robert Stroud Laboratory pascal(a)msg.ucsf.edu

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