- phenixbb - phenix-online.org

BEAM TIME AVAILABLE FOR MACROMOLECULAR CRYSTALOGRAPHY
by Cyndi Salbego 16 Sep '08

16 Sep '08

BEAM TIME AVAILABLE FOR MACROMOLECULAR CRYSTALLOGRAPHY AT THE TWO ID BEAMLINES OF NE-CAT AT APS. Beamline 24ID-C: Variable energy between 6-18keV, ADSC Q315 Detector, MAD Capable. Beamline 24ID-E: Equipped with MD2 microdiffractometer, delivering beam as small as 5 microns. Single energy (12662eV), ADSC Q315 Detector. Contact csalbego(a)anl.gov for further details. See http://necat.chem.cornell.edu for information on our beamlines and a calendar of available days.

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link in a double conformation residue
by mvliberato＠ursa.ifsc.usp.br 12 Sep '08

12 Sep '08

Dear all, I'm refining a protein structure with a cysteine covalently bonded with a fatty acid. However, this cysteine has a double conformation. I try to make a link with "cif_link.params", but I don't know how to describe the double conformation. How can I make this link between the fatty acid oxigen and the sulfur of the cysteine in one of the conformations? Any help would be much appreciated! Thanks Marcelo Marcelo Vizoná Liberato, Ms Physics Institute of São Carlos - USP São Carlos, Brazil ---------------------------------------------------------------- WEBMAIL - IFSC - Instituto de FÃsica de SÃ£o Carlos

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Odd twinning issue (or maybe all twinning issues are odd by default)
by Francis E Reyes 12 Sep '08

12 Sep '08

All I had a structure that seemed perfectly twinned in P41 21 2, completely built to the observable density (no peaks in 2Fo-Fc map over 2sigma) and refined to 33/35 (R/Rfree). I indexed, scaled, and merged the original unmerged data to P41, molecular replaced using the above model. Three rounds of rigid body refinement of the MR solution with group adp's dropped R/Rfree to 28/30 (while generating new free R flags based on the P41 data). The resolution was to 2.5 so I skipped the NCS. Now I try to do a second round of refinement with this time individual_sites and individual_adps with no change to the input model. The final R/Rfree's are now in the 50's? Am I missing something (fundamental) ? 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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difficulties with autoMR
by Feldman III, George Franklin 10 Sep '08

10 Sep '08

I am trying to run phenix.automr on what I believe is perhaps a perfectly twinned data set, at 3A resolution. It is in space group 146 and according to the matthews has 3 molecules in the asu. This is a mutant of an orriginally published structure in which only one residue has been mutated (but crystallizes in a different space group). When I give the autoMR the following input: phenix.automr coords="MR.1.pdb" data=dtscale.ref resolution=0 component_type=protein identity="95" mass=13900 build=False copies=3 seq.dat I get an LLG of 37 and the run goes quite quickly. The speed of the run itself leads me to believe that I have a correct solution regardless of the slightly low LLG, but when I open the .pdb output file there is only one molecule in the asu. Am I doing something incorrectly? Why is there only one molecule instead of 3 in the asu, and how can I go about getting the other two to appear? I did let the program go ahead run autobuild, this resulted in a structure with an r_work:.5448 and r_free:.6005. I am relatively new to crystallography, but these values seem rather high to be a good starting point for refinement. I would appreciate any advice that might help me move on with my structure. Attached is the log file from phenix.xtriage in case it may be of any help. Thank you, in advance, for all of your help and advice. Best Regards, George F. Feldman

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Re: [phenixbb] cci_apps on irix
by Ralf W. Grosse-Kunstleve 07 Sep '08

07 Sep '08

On 22 Aug 2008 o.h.weiergraeber(a)fz-juelich.de wrote: > I am just compiling the latest cci_apps package for the IRIX > platform. I know this is unsupported, but since the package is very > self-contained, I would not expect major problems with the command-line > packages (who needs a gui, anyway ;)) > I'm just running into two issues with the boost package which are > obviously a matter of syntax: Our IRIX machine is up again, and - to my surprise - the current CCI Apps compiled without errors. The IRIX binary bundle is available again at the usual place: http://www.phenix-online.org/download/cci_apps/ Ralf

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selection usage
by Mark Collins 05 Sep '08

05 Sep '08

Hi All, The current phenix 1.3 release automatically selects alternate conformations when refine *occupancy is selected. How do I select a loop region (in low density) to refine the loop occupancy without messing up the auto selection? Thanks in advance, Mark

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Deborah Palestrant is out of the office.
by deborah.palestrant＠novartis.com 05 Sep '08

05 Sep '08

I will be out of the office starting 09/04/2008 and will not return until 09/08/2008.

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Re: [phenixbb] sugar links
by Ralf W. Grosse-Kunstleve 04 Sep '08

04 Sep '08

Hi Morten, > Why isn't it included in the standard set btw? Sorry, too many bigger things to take care off right now. But Garib told me he'll move the monomer library to a Google source server, which should make it much more practical to collectively work on changes like the one you're requesting. Ralf

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Re: [phenixbb] Real Space R value
by Thomas C. Terwilliger 03 Sep '08

03 Sep '08

Hi Matthew, You can also use phenix.get_cc_mtz_pdb with a ligand...it should treat the ligand as a single residue. Mark also asked offline about alternate conformations...here is my answer to that: If there is only on N for each residue, it will average over all atoms in all conformations. If there are multiple N atoms, and all atoms for each conformer are grouped, it will write out the residue twice. If there are multiple N atoms and they are interspersed, it will give an incorrect answer (it will write out the residue twice but the cc values will not be for the two conformers). All the best, Tom T > Hi, > Yes, you can use phenix.get_cc_mtz_pdb (see phenix.doc) > > But I wonder if there is a way to get CC value for a ligand or a metal > ion too ?? > > Nigel ??? > >> Date: Tue, 2 Sep 2008 13:18:59 -0400 >> From: "nih\mayerm" <mayerm(a)mail.nih.gov> >> Subject: [phenixbb] Real Space R value >> To: phenixbb(a)phenix-online.org >> Message-ID: <FEAAD2DC-1906-4194-881B-CA83B48E8043(a)mail.nih.gov> >> Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed >> >> >> Is it possible to calculate a list of Real Space R values for >> structures refined with phenix.refine ? >> If so advice on how to do this would be greatly appreciated. >> >> Thanks - Mark Mayer >> >> > > _______________________________________________ > phenixbb mailing list > phenixbb(a)phenix-online.org > http://www.phenix-online.org/mailman/listinfo/phenixbb >

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Re: [phenixbb] Real Space R value
by mathieu Coincon 03 Sep '08

03 Sep '08

Hi, Yes, you can use phenix.get_cc_mtz_pdb (see phenix.doc) But I wonder if there is a way to get CC value for a ligand or a metal ion too ?? Nigel ??? > Date: Tue, 2 Sep 2008 13:18:59 -0400 > From: "nih\mayerm" <mayerm(a)mail.nih.gov> > Subject: [phenixbb] Real Space R value > To: phenixbb(a)phenix-online.org > Message-ID: <FEAAD2DC-1906-4194-881B-CA83B48E8043(a)mail.nih.gov> > Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed > > > Is it possible to calculate a list of Real Space R values for > structures refined with phenix.refine ? > If so advice on how to do this would be greatly appreciated. > > Thanks - Mark Mayer > >

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