- phenixbb - phenix-online.org

PDF slides: introduction to refinement, phenix.refine and why automation is important (PHENIX)
by Pavel Afonine 09 Mar '09

09 Mar '09

Dear PHENIX community: I would like to draw your attention to these two PDF files with the slides that I recently made for a PHENIX workshop (workshop on Neutron crystallography, March 5-6, Japan). The first file (69 of very dense slides) makes a general introduction to crystallographic structure refinement (certainly biased towards how things are done in phenix.refine), plus some introduction to phenix.refine functionality. The second PDF file talks about PHENIX and "quick validation" with the strong accent of why automation is important. In general, I don't like and normally don't do such advertisements, but in this case I believe I can make an exception since I spent too much "of my software development" time on making these slides and they might be instructive for (new) PHENIX users. The links are (the first two!): http://www.phenix-online.org/presentations/neutron_japan_2009/ Thanks, Pavel. PS> Two slides in the first file are borrowed from Sasha Urzhumtsev, and 2-3 slides are borrowed from Paul Adams (second file).

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Re: [phenixbb] phenixbb Digest, Vol 40, Issue 7
by Pascal Egea 08 Mar '09

08 Mar '09

Pavel and Paul, this is really awesome.Thanks a lot. Pascal Egea UCSF Department of Biochemistry and Biophysics Laboratory of Robert Stroud On Sun, Mar 8, 2009 at 1:00 PM, <phenixbb-request(a)phenix-online.org> wrote: > Send phenixbb mailing list submissions to > phenixbb(a)phenix-online.org > > To subscribe or unsubscribe via the World Wide Web, visit > http://www.phenix-online.org/mailman/listinfo/phenixbb > or, via email, send a message with subject or body 'help' to > phenixbb-request(a)phenix-online.org > > You can reach the person managing the list at > phenixbb-owner(a)phenix-online.org > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of phenixbb digest..." > > > Today's Topics: > > 1. PDF slides: introduction to refinement, phenix.refine and why > automation is important (PHENIX) (Pavel Afonine) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Sat, 07 Mar 2009 23:41:35 -0800 > From: Pavel Afonine <PAfonine(a)lbl.gov> > Subject: [phenixbb] PDF slides: introduction to refinement, > phenix.refine and why automation is important (PHENIX) > To: phenixbb(a)phenix-online.org > Message-ID: <49B376AF.1020803(a)lbl.gov> > Content-Type: text/plain; charset=ISO-8859-1; format=flowed > > Dear PHENIX community: > > I would like to draw your attention to these two PDF files with the > slides that I recently made for a PHENIX workshop (workshop on Neutron > crystallography, March 5-6, Japan). > > The first file (69 of very dense slides) makes a general introduction to > crystallographic structure refinement (certainly biased towards how > things are done in phenix.refine), plus some introduction to > phenix.refine functionality. > > The second PDF file talks about PHENIX and "quick validation" with the > strong accent of why automation is important. > > In general, I don't like and normally don't do such advertisements, but > in this case I believe I can make an exception since I spent too much > "of my software development" time on making these slides and they might > be instructive for (new) PHENIX users. > > The links are (the first two!): > > http://www.phenix-online.org/presentations/neutron_japan_2009/ > > Thanks, > Pavel. > > PS> Two slides in the first file are borrowed from Sasha Urzhumtsev, and > 2-3 slides are borrowed from Paul Adams (second file). > > > > > ------------------------------ > > _______________________________________________ > phenixbb mailing list > phenixbb(a)phenix-online.org > http://www.phenix-online.org/mailman/listinfo/phenixbb > > > End of phenixbb Digest, Vol 40, Issue 7 > *************************************** >

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Re: [phenixbb] refinement using a multiprocessor machine or on a cluster
by Pavel Afonine 07 Mar '09

07 Mar '09

Hi Gino, phenix.refine does not use any advantage of multiple available CPUs. Sorry. Pavel. On 3/4/09 11:26 AM, Gino Cingolani wrote: > Dear Phenix community, > > I was wondering if it is possible to run a refinement job on multiple > processor. The refinement of my 13,000 asymmetric unit takes about 2 > days. It could be greatly speeded up by taking advantage of the 4 CPUs > in my PC. The phenix manual suggest to use > nproc=3 > to run using a multiprocessor machine or on a cluster. > But this applies only to LigandFit and AutoBuild Wizards. > What about simple refinement? > > Thanks in advance, > > Gino > >

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fwd: TLS without isotropic adp refinement
by Nathaniel Echols 07 Mar '09

07 Mar '09

(I think the server must have a lag time between adding a new email address and accepting posts from it. . .) > From: Roeland Boer <rbocri(a)ibmb.csic.es> > Date: March 5, 2009 5:29:19 AM PST > To: phenixbb(a)phenix-online.org > Subject: TLS without isotropic adp refinement > > Dear all, > > I'm trying to refine a structure using TLS on some of the domains > without refining the isotropic B factors of the atoms of the full > structure. I haven't been able to do this: the isotropic B factors > seem to be refined per residue when I include TLS. If I don't use > TLS, the B factors are not refined. I've looked around in the > archives and browsed the manual without luck. Any suggestions would > be highly appreciated. I include the parameter file I've used. Quoting Pavel (since he's teaching a workshop): "phenix.refine always writes out the total B-factors and not split them. The total B-factor in phenix.refine is defined as: Utotal = Utls + Ulocal + Ucryst." So the atomic B-factors in your structure are not being refined individually, but they change anyway because the contribution of the TLS refinement is included. -Nat > > Kind regards, > Roeland Boer. > > > ++++++++++++++ Parameters ++++++++++++++++ > > refinement.main.number_of_macro_cycles=4 > refinement.main.ncs = True > refinement.input.xray_data { > labels=F > low_resolution=20.0 > high_resolution=3.6 > } > refinement.refine { > strategy=tls+individual_sites > adp { > tls="chain A and (resid 4:132 or resid 301)" > tls="chain B and (resid 4:132 or resid 301)" > tls="chain C and (resid 4:132 or resid 301)" > tls="chain X and (resid 4:132 or resid 301)" > tls="chain Y and (resid 4:132 or resid 301)" > tls="chain Z and (resid 4:132 or resid 301)" > } > } > refinement.ncs { > find_automatically = False > restraint_group { > reference = chain A and resid 133:203 > selection = chain B and resid 133:203 > selection = chain C and resid 133:203 > selection = chain X and resid 133:203 > selection = chain Y and resid 133:203 > selection = chain Z and resid 133:203 > } > restraint_group { > reference = chain B and (resid 4:132 or resid 301) > selection = chain A and (resid 4:132 or resid 301) > selection = chain C and (resid 4:132 or resid 301) > selection = chain X and (resid 4:132 or resid 301) > selection = chain Y and (resid 4:132 or resid 301) > selection = chain Z and (resid 4:132 or resid 301) > } > } > refinement.output.prefix=3.6-tlsnter-indsite-inputb-autowght-ncs > -------------------- Parameters -------------------------- > > ------------------- Nathaniel Echols Lawrence Berkeley Lab 510-486-5136 NEchols(a)lbl.gov

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Re: [phenixbb] fwd: kicked maps
by Pavel Afonine 07 Mar '09

07 Mar '09

Hi Maia, I think it's easier to try out and have an answer right away rather than speculate. Why don't you just try and see if it helps? I can't tell in advance if it will help or not. Again, a "average kick map" (AKM) is computed as following: we create a large ensemble of structures (~500 structures) that are all randomly shaken. The shake amount (rmsd distortion introduced to coordinates) varies from 0 to 1.0A. Then for each structure the map is computed (mFo-DFc or 2mFo-DFc or any other requested by the user). And finally, all maps are averaged out to produce one "averaged kick map". Obviously, just from general considerations, such map is supposed to have less or no bias, less noise and enhanced signal, and potentially can clear up some initially bad densities. I would also try an "omit AKM", where you remove some model parts in questions and compute mFo-DF and 2mFo-DFc AK maps. Please use the latests CCI Apps for this since we recently fixed a number of problems with this. Pavel. >> Hi Pavel, I have a problem with long linkers between domains in a >> protein structure that is a biological hexamer. >> I don't have much density for the linkers. Should "kicked maps" help >> me to see the density? The resolution of the X-ray data is 2.3A. >> >> Maia >

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default bondlengths - metal
by Engin Ozkan 06 Mar '09

06 Mar '09

Hi, all, Recently following the phenixbb, I was made aware of phenix.metal_coordination. So I just gave it a try for a structure of mine with sodium in it. Specifically, I decided to turn the use-default-bondlengths option on. The result was surprising, because the output file thinks that sodum to oxygen distances are supposed to be 1.9 Angstroms. Work done by Marjorie Harding and others have shown that this distance should be about 2.4 (Acta Cryst. D62 (2006), 678-682; for a summary of their numbers, http://tanna.bch.ed.ac.uk/newtargs_06.html). I wonder why phenix.metal_coordination chose 1.9 A as the default Na-O distance, or is the default option a different type of bond distance, I am not sure. Any clarification from the authors would be appreciated. Below is part of the output, showing the distance: refinement.geometry_restraints.edits { bond { action = *add atom_selection_1 = name NA and chain N and resname NA and resseq 1 atom_selection_2 = name O and chain A and resname PHE and resseq 76 distance_ideal = 1.920420 sigma = 0.01 } } Engin

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fwd: phenix.autobuild- multiple models.
by Nathaniel Echols 04 Mar '09

04 Mar '09

> (The server bounced this message for some reason.) > From: Michael Karl Uhl <michael.uhl(a)uni-graz.at> > Date: March 3, 2009 11:55:16 PM PST > To: phenixbb(a)phenix-online.org > Subject: phenix.autobuild- multiple models > Reply-To: michael.uhl(a)a-b.at > > > Hello, > > I have not registered for this list until now, but have a very > urgent question concerning phenix.autobuild and multiple models as > input. Is there a possibility to merge models generated by different > phenix.autobuild runs. I have several overall_best-structure and > want to merge them into one single overall_best structure. I have > found the keyword "merge_models= True" but it does not really work > (Sorry, unknown file or keyword: merge_models=True). How should I > make the input in this case? > > > Thanks a lot, > > > Michael Uhl. > > ------------------- Nathaniel Echols Lawrence Berkeley Lab 510-486-5136 NEchols(a)lbl.gov

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Re: [phenixbb] Please help with neutron composite SA-omit
by Pavel Afonine 03 Mar '09

03 Mar '09

Hi Anna, a "kick map" is computed as following: we create a large ensemble of structures (~500 structures) that are all randomly shaken. The shake amount (rmsd distortion introduced to coordinates) varies from 0 to 1.0A. Then for each structure the map is computed (mFo-DFc or 2mFo-DFc or any other requested by the user). And finally, all maps are averaged out to produce one "averaged kick map". Obviously, such map is supposed to have less or no bias, less noise, and potentially can clear up some initially bad densities. The is currently no paper published about this method; we are preparing the manuscript. There are scattered references and uses of AK maps, mostly by Dusan Turk (he originally implemented it in his program MAIN). Documentation is not yet updated, this is true. Sorry. In phenix.refine GUI you can just check the corresponding box to compute a kick map (under map menu). In command line version you need to supply a parameter file that will define such map: refinement.electron_density_maps { map { mtz_label_amplitudes = 2FOFCWT mtz_label_phases = PH2FOFCWT likelihood_weighted = True obs_factor = 2 calc_factor = 1 kicked = True fill_missing_f_obs_with_weighted_f_model = True } map { mtz_label_amplitudes = FOFCWT mtz_label_phases = PHFOFCWT likelihood_weighted = True obs_factor = 1 calc_factor = 1 kicked = True fill_missing_f_obs_with_weighted_f_model = True } } I was recently trying this with neutron maps and the maps are significantly better (computed with AK approach). Please use the latest version of CCI Apps for this. Let me know if you have any questions or problems. Pavel. On 2/24/09 7:58 AM, Anna Gardberg wrote: > Hi, Pavel. > > I'm not trying to bring up features, exactly, but rather trying to get > an unbiased, quantitative measure of the the deuterium atoms' nuclear > density. The idea is to compare the visibility of hydrogen or > deuterium atoms with x-ray and neutron diffraction, correlating this > parameter (perhaps in the form of OMIT density) to others. > > I have only briefly toyed with kick-maps, but the lack of > documentation (http://phenix-online.org/documentation/refinement.htm > doesn't say much about how best to use them) made it frustrating. Can > you recommend an article about kick maps? Or some suggestions on how > to best use this feature, please? > > > -Anna > > On Mon, Feb 23, 2009 at 11:46 PM, Pavel Afonine <PAfonine(a)lbl.gov> wrote: > >> Hi Anna, >> >> you can ask phenix.refine produce "kick maps" that are supposed to be less >> biased, contain less noise and, if you are lucky, might bring some more >> features (that were buried in noise before). >> >> Let me know if you have any questions. >> >> Pavel. >> >> >> On 2/23/09 11:40 AM, Anna Gardberg wrote: >> >>> Hello. >>> >>> I am attempting to create an SA-omit composite map with neutron >>> scatterers. >>> >>> Unfortunately, >>> >>> phenix.autobuild data= "neutron.mtz" model="neutron_004.pdb" >>> composite_omit_type=sa_omit scattering_table=neutron >>> >>> results in an error: >>> >>> "Sorry, unknown file or keyword: scattering_table=neutron >>> Possibilities... (use 'phenix.autobuild --help all' to get full help): >>> general.resolve_pattern_command_list=neutron >>> density_modification.use_resolve_pattern=neutron >>> decision_making.semi_acceptable_r=neutron >>> decision_making.acceptable_r=neutron >>> multiple_models.multiple_models_starting_resolution=neutron >>> " >>> >>> Can someone here help, please? >>> >>> (For what it's worth: I'd use nCNS, but while CNS 1.21 (precompiled >>> binaries) works on my computer, CNS 1.1 version seems to compile, it >>> will not run. When I apply the nCNS patch to CNS 1.1, again it seems >>> to compile, but will not run. ) >>> >>> Regards, >>> Anna Gardberg >>> _______________________________________________ >>> phenixbb mailing list >>> phenixbb(a)phenix-online.org >>> http://www.phenix-online.org/mailman/listinfo/phenixbb >>> >>>

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AutoBuild after resolve
by Mo Wong 28 Feb '09

28 Feb '09

Hi all, Can someone tell me where in the AutoBuild GUI I can set "phases_from_resolve"? I've looked for it in the "set variable" section, but it's not listed. Thanks!

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rfree flag fractions
by Yusuf Akhter 28 Feb '09

28 Feb '09

Hi Everybody! I am using phenix version 1.3b for refining a structure at 3 A resolution and total number of total reflections are 12680. I have seen a provision in phenix to change the default maximal number of test flags to be generated and the fraction with this command line xray_data.r_free_flags.fraction=0.05 xray_data.r_free_flags.max_free=500 My queries are 1)when should somebody use this utility ?? 2)what is minimum number of Rfree flags one should use on this resolution and this total number of reflections?? Any kind of suggestions will be appreciated. Cheers! Yusuf

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RuntimeError: Not enough memory for cubicles:
by Gino Cingolani 27 Feb '09

27 Feb '09

Hi, I'm refining a huge structure with ~13,000 residues in the asymmetric unit. I started a massive job with the following inputs: phenix.refine data.mtz model.pdb ordered_solvent=true strategy=individual_sites+group_adp+tls tls_group_selections.params main.ncs=true main.number_of_macro_cycles=10 After >24 h the Rfree had dropped from 45% to 33%, but at the very end, just before outputting the refined pdb model, Phenix died with the following error message: ############################################################ Hello all========== residual map mFobs-DFmodel: highest peaks and deepst holes ========= ----------peaks---------- Traceback (most recent call last): File "/usr/local/phenix-1.3-final/phenix/phenix/command_line/refine.py", line 5, in <module> command_line.run(command_name="phenix.refine", args=sys.argv[1:]) File "/usr/local/phenix-1.3-final/phenix/phenix/refinement/command_line.py", line 89, in run call_back_after_monitor_collect=call_back_after_monitor_collect) File "/usr/local/phenix-1.3-final/phenix/phenix/refinement/driver.py", line 1081, in run call_back_after_monitor_collect = call_back_after_monitor_collect) File "/usr/local/phenix-1.3-final/phenix/phenix/refinement/strategies.py", line 724, in refinement_machine fmodels=fmodels, model=model, log=log) File "/usr/local/phenix-1.3-final/phenix/phenix/refinement/strategies.py", line 752, in highest_peaks_and_deepest_holes_in_residual_map log = log) File "/usr/local/phenix-1.3-final/mmtbx/mmtbx/find_peaks.py", line 210, in show_highest_peaks_and_deepest_holes log = log) File "/usr/local/phenix-1.3-final/mmtbx/mmtbx/find_peaks.py", line 117, in __init__ map = fft_map_data).all(max_clusters = max_number_of_peaks) File "/usr/local/phenix-1.3-final/cctbx/cctbx/maptbx/__init__.py", line 196, in peak_search max_clusters=parameters.max_clusters()) File "/usr/local/phenix-1.3-final/cctbx/cctbx/maptbx/__init__.py", line 303, in __init__ general_positions_only=self._general_positions_only) File "/usr/local/phenix-1.3-final/cctbx/cctbx/crystal/__init__.py", line 477, in site_cluster_analysis cubicle_epsilon=cubicle_epsilon) RuntimeError: Not enough memory for cubicles: This may be due to unreasonable parameters: cubicle_edge=0.7 space_span=(293.298,92.903,214.527) n_cubicles=(419,133,307) max_number_of_bytes=1724676096 ###################################################### Any suggestion on what to do? As invididual refinement modules (e.g. regular rigid body refinemnet, SA, energy minimization, TLS, etc) run OK, is the problem coming from the "ordered_solvent=true" command? Thanks in advance! Gino Cingolani, Ph.D. *********************************************************** Gino Cingolani, Ph.D. Assistant Professor Dept. of Biochemistry and Molecular Biology SUNY Upstate Medical University 750 E. Adams Street, Syracuse, NY, 13210 Tel. (315) 464 8744 Fax. (315) 464 8750 Email: cingolag(a)upstate.edu *********************************************************** "Nati non foste per viver come bruti, ma per seguir virtute e conoscenza" ("You were not born to live like brutes, but to follow virtue and knowledge") Dante, The Divine Comedy (Inferno, XXVI, vv. 119-120)

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Failed to carry out AutoBuild_parallel_omit
by Jhon Thomas 26 Feb '09

26 Feb '09

Hello all There is a problem with running phenix.autobuild. Failed to carry out AutoBuild_parallel_omit: child process stderr output: command: 'csh /home/thomas/phenix_omitmap/AutoBuild_run_1_/TEMP0/RUN_FILE_1' Badly placed ()'s. What could be solution. Thanks Thomas

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resolve.phenix and helices_strands_only
by Mo Wong 25 Feb '09

25 Feb '09

Hi all, I'm sure I've done this before, but could some please let me know/remind me what the correct syntax is for including "helices_strands_only=True" in a resolve script like the one below? phenix.resolve<<EOD hklin solve.mtz labin FP=FP SIGFP=SIGFP PHIB=PHIB FOM=FOM HLA=HLA HLB=HLB HLC=HLC HLD=HLD solvent_content 0.43 database 5 EOD Thanks!

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Select atoms by B-factors?
by Oliver Clarke 25 Feb '09

25 Feb '09

Hi, I'm currently refining a structure at 1.6A. Substantial portions of the structure are very well ordered, with B-factors < 15. I'd like to refine these well ordered regions using anisotropic thermal parameters, while keeping everything else isotropic. However, in doing so, the atom selections tend to become quite convoluted. Is there any way to select all atoms which initially have an isotropic B less than a certain cuttoff value? That way one could (after isotropic B-factor refinement) select the most ordered regions of the structure for anisotropic refinement. Cheers, Oliver Clarke

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links and REMARK 3 record in the final PDB
by Pascal Egea 24 Feb '09

24 Feb '09

Dear All, I apologize if this question has already been answered. I am refining a structure of a glycosylated-enzyme and I understood the way to define all the links (N-glycosylation to the ASN and beta-glycosidic bonds between the NAG units) and refinement is complete and everything is good. All the links I included in my cif_link definition file where taken into account and dealt with by Phenix (the .def and .geo files are fine). Is it normal however that in the resulting refined PDB file, no such links are written by PHENIX under the REMARK 3 record ? Same thing for the 5 disulfide bonds present in the protein. Thanks in advance for the clarification. Pascal Egea University of California San Francisco Department of Biochemistry and Biophysics Laboratory of Robert Stroud

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Please help with neutron composite SA-omit
by Anna Gardberg 24 Feb '09

24 Feb '09

Hello. I am attempting to create an SA-omit composite map with neutron scatterers. Unfortunately, phenix.autobuild data= "neutron.mtz" model="neutron_004.pdb" composite_omit_type=sa_omit scattering_table=neutron results in an error: "Sorry, unknown file or keyword: scattering_table=neutron Possibilities... (use 'phenix.autobuild --help all' to get full help): general.resolve_pattern_command_list=neutron density_modification.use_resolve_pattern=neutron decision_making.semi_acceptable_r=neutron decision_making.acceptable_r=neutron multiple_models.multiple_models_starting_resolution=neutron " Can someone here help, please? (For what it's worth: I'd use nCNS, but while CNS 1.21 (precompiled binaries) works on my computer, CNS 1.1 version seems to compile, it will not run. When I apply the nCNS patch to CNS 1.1, again it seems to compile, but will not run. ) Regards, Anna Gardberg

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Re: [phenixbb] Please help with neutron composite SA-omit
by Thomas C. Terwilliger 23 Feb '09

23 Feb '09

Hi again Anna, Can you possibly try this syntax for the "refine.eff" file: refinement{ main {scattering_table=neutron} } and then say phenix.autobuild <your usual parameters> refine_eff_file=refine.eff That should do it! All the best, -Tom T > Hello. > > I am attempting to create an SA-omit composite map with neutron > scatterers. > > Unfortunately, > > phenix.autobuild data= "neutron.mtz" model="neutron_004.pdb" > composite_omit_type=sa_omit scattering_table=neutron > > results in an error: > > "Sorry, unknown file or keyword: scattering_table=neutron > Possibilities... (use 'phenix.autobuild --help all' to get full help): > general.resolve_pattern_command_list=neutron > density_modification.use_resolve_pattern=neutron > decision_making.semi_acceptable_r=neutron > decision_making.acceptable_r=neutron > multiple_models.multiple_models_starting_resolution=neutron > " > > Can someone here help, please? > > (For what it's worth: I'd use nCNS, but while CNS 1.21 (precompiled binaries) works on my computer, CNS 1.1 version seems to compile, it will not run. When I apply the nCNS patch to CNS 1.1, again it seems to compile, but will not run. ) > > Regards, > Anna Gardberg > _______________________________________________ > phenixbb mailing list > phenixbb(a)phenix-online.org > http://www.phenix-online.org/mailman/listinfo/phenixbb >

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Re: [phenixbb] Please help with neutron composite SA-omit
by Thomas C. Terwilliger 23 Feb '09

23 Feb '09

Hi Anna, Try putting your cmmand "scattering_table=neutron" in a "refine.eff" file and then run phenix.autobuild including the keyword refine_eff_file=refine.eff (note that you may need to specify the scope of scattering_table just as if you were using the command directly for phenix.refine) That is the way you can put any phenix.refine parameters into autobuild. Let me know if that doesn't do it! -Tom T > Hello. > > I am attempting to create an SA-omit composite map with neutron > scatterers. > > Unfortunately, > > phenix.autobuild data= "neutron.mtz" model="neutron_004.pdb" > composite_omit_type=sa_omit scattering_table=neutron > > results in an error: > > "Sorry, unknown file or keyword: scattering_table=neutron > Possibilities... (use 'phenix.autobuild --help all' to get full help): > general.resolve_pattern_command_list=neutron > density_modification.use_resolve_pattern=neutron > decision_making.semi_acceptable_r=neutron > decision_making.acceptable_r=neutron > multiple_models.multiple_models_starting_resolution=neutron > " > > Can someone here help, please? > > (For what it's worth: I'd use nCNS, but while CNS 1.21 (precompiled > binaries) works on my computer, CNS 1.1 version seems to compile, it > will not run. When I apply the nCNS patch to CNS 1.1, again it seems > to compile, but will not run. ) > > Regards, > Anna Gardberg > _______________________________________________ > phenixbb mailing list > phenixbb(a)phenix-online.org > http://www.phenix-online.org/mailman/listinfo/phenixbb >

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DTT at special position
by Nikos Pinotsis 23 Feb '09

23 Feb '09

Dear all, even though I checked the documentation and previous threads I didn't find something relative to my problem: I have an elongated e-density that looks like DTT and appears to be located on a special position (there is actually an axis betwenn C2 and C3 atoms of DTT). Refining with phenix.refine using either 0.5 or 1.0 occupancy, I am getting the DTT molecule outside the density (and the symmetry related DTT from the other side and still in the middle the strong difference density. thanks in advance for any suggestions-solutions Nikos -- --------------------------------- Dr. Nikos Pinotsis Section of Structural Biology Institute of Cancer Research Chester Beatty Laboratories 237 Fulham Road London SW3 6JB, UK Tel: +44 20 7153 5453 / 5447 --------------------------------- The Institute of Cancer Research: Royal Cancer Hospital, a charitable Company Limited by Guarantee, Registered in England under Company No. 534147 with its Registered Office at 123 Old Brompton Road, London SW7 3RP. This e-mail message is confidential and for use by the addressee only. If the message is received by anyone other than the addressee, please return the message to the sender by replying to it and then delete the message from your computer and network.

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ADP refinement
by Katya Heldwein 20 Feb '09

20 Feb '09

Hi, I would like to use TLS refinement for protein (I have selected TLS groups) and individual isotropic refinement for water. How can I specify this in phenix.refine? Thanks, Katya -- Ekaterina Heldwein, Ph.D. Assistant Professor Department of Molecular Biology and Microbiology Tufts University School of Medicine 136 Harrison Ave Boston, MA 02111 phone: 617-636-0858 fax: 617-636-0337 e-mail: katya.heldwein(a)tufts.edu

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Strange negative density when refining at low resolution
by Andrew Purkiss-Trew 20 Feb '09

20 Feb '09

Dear Phenixers I've been helping a colleague with a dataset at ~3.8 Angstroms (phases and map from AutoSharp using SAD phasing). At the moment he has an incomplete polyALA model consisting of two chains related by NCS and a few extra sections. Refinement seems to proceed OK using phenix.refine version 1.4-3, but the resultant maps have blobs of negative density in the core of the protein. I am assuming that these are a side-effect of the bulk-solvent correction part of the refinement which is confusing the region where the protein sidechains would be as solvent. There are no corresponding negative peaks on the surface of protein, but some positive peaks where larger sidechains may be. Is this interpretation likely to be correct and if so, which parameter should be altered in the Bulk Solvent section of the input to allow for a bigger mask around the protein. I see that it isn't recommended to change the parameters, but the refinement.mask.solvent_radius=1.0 looks like an obvious candidate. If necessary, I can get an image made showing the maps. Thanks Andrew Purkiss-Trew This communication is from Cancer Research UK. Our website is at www.cancerresearchuk.org. We are a charity registered under number 1089464 and a company limited by guarantee registered in England & Wales under number 4325234. Our registered address is 61 Lincoln's Inn Fields, London WC2A 3PX. Our central telephone number is 020 7242 0200. This communication and any attachments contain information which is confidential and may also be privileged. It is for the exclusive use of the intended recipient(s). If you are not the intended recipient(s) please note that any form of disclosure, distribution, copying or use of this communication or the information in it or in any attachments is strictly prohibited and may be unlawful. If you have received this communication in error, please notify the sender and delete the email and destroy any copies of it. E-mail communications cannot be guaranteed to be secure or error free, as information could be intercepted, corrupted, amended, lost, destroyed, arrive late or incomplete, or contain viruses. We do not accept liability for any such matters or their consequences. Anyone who communicates with us by e-mail is taken to accept the risks in doing so.

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2 Wonderings: adding H atoms and overcoming overfitting problem
by Young-Jin Cho 19 Feb '09

19 Feb '09

Hi, my current wonderings are as below: First, how can I add H atoms into nucleotide ligands in pdb file? I did 'phenix.reduce model.pdb > model_h.pdb', but as I see it didn't add H's of sugar (1', 2', 3' 4' and 5'). Once I had this kind of problem before, I was suggested to use phenix.ready_set command but seemingly this does not work any longer with last version that I am using now. Also, is it possible to add H into phosphate group? The second very general question is about getting over overfitting problem. My phenix runs gave me too much difference between R and Rfree about .7 w/o adding H atoms. I assume it came from water molecules because it(huge gap) just starts to happen after 1_bss stage. If anybody can suggest a good way to get over this problem, you will save my tremendous times and useless efforts. Big thanks in advance, Young-Jin

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optimizing target weights in phenix
by Yusuf Akhter 19 Feb '09

19 Feb '09

*Hi Everybody, I am using phenix-1.3b. When i tried to use "Optimizing target weights" utility by typing following command line * *phenix.refine data.hkl model.pdb optimize_wxc=true optimize_wxu=true I got following error. * Traceback (most recent call last): File "/public/xtal/phenix/phenix-1.3b/phenix-1.3b/phenix/phenix/command_line/refine.py", line 5, in <module> command_line.run(command_name="phenix.refine", args=sys.argv[1:]) File "/public/xtal/phenix/phenix-1.3b/phenix-1.3b/phenix/phenix/refinement/command_line.py", line 78, in run call_back_after_monitor_collect=call_back_after_monitor_collect) File "/public/xtal/phenix/phenix-1.3b/phenix-1.3b/phenix/phenix/refinement/driver.py", line 1308, in run log = log) File "/public/xtal/phenix/phenix-1.3b/phenix-1.3b/phenix/phenix/refinement/strategies.py", line 642, in refinement_machine log = log) File "/public/xtal/phenix/phenix-1.3b/phenix-1.3b/phenix/phenix/refinement/weight_xray_chem.py", line 327, in __init__ self.wxc_optimization() File "/public/xtal/phenix/phenix-1.3b/phenix-1.3b/phenix/phenix/refinement/weight_xray_chem.py", line 450, in wxc_optimization rw, rf, b, a, a_xc = self.wx_opt_helper(w = wxc_scale_0 * wxc, sites=True) File "/public/xtal/phenix/phenix-1.3b/phenix-1.3b/phenix/phenix/refinement/weight_xray_chem.py", line 387, in wx_opt_helper verbose = 0) TypeError: __init__() takes at least 5 non-keyword arguments (3 given) *May anybody tell me please how can i fix these errors?? Thanks in advance. yusuf *

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maintenance release of CCI Apps
by Pavel Afonine 17 Feb '09

17 Feb '09

PHENIX users: A maintenance release of CCI Apps is available: http://www.phenix-online.org/download/ See "Changes" section for the list of problems fixed: http://www.phenix-online.org/download/cci_apps/ Pavel.

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phenix.refine GUI freezes when using Coot or Pymol
by Derek Logan 17 Feb '09

17 Feb '09

Hi, I've been using the phenix.refine GUI for a few days now and find it a very valuable addition. However I notice that when I choose to display the results of refinement in Pymol or Coot, it freezes the GUI until I exit the chosen graphics program. Is this a bug or a feature? If nothing else, it makes it hard to analyse the MolProbity results in Coot. I'm using Mac OS X 10.5.6. Thanks Derek __________________________________________________________________ Derek Logan tel: +46 46 222 1443 Associate Professor fax: +46 46 222 4692 Molecular Biophysics mob: +46 76 8585 707 Centre for Molecular Protein Science Lund University, Box 124, 221 00 Lund, Sweden

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