- phenixbb - phenix-online.org

27 Apr '15

Is there a way to "idealize" a structure in Phenix? I mean, ideal omega, all residues within allowed regions of Ramachandran maps, no clashes..etc. I know it won't fit the map well but I would like to see what it looks like. Thank you. ____________________________________________________________ FREE 3D MARINE AQUARIUM SCREENSAVER - Watch dolphins, sharks & orcas on your desktop! Check it out at http://www.inbox.com/marineaquarium

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Re: [phenixbb] citation
by Sneha Rangarajan 27 Apr '15

27 Apr '15

Hello All, I have a non-Phenix problem- finding shape complementarity! I tried running the script for sc (ccp4) but it doesn't run to completion to give me the sc number. It stops saying "imaginary contain". What does that mean? However there is no error as such. I gave it the pdb that I got after my phenix refinement. Is there something I should be doing first to the pdb after refinement before running sc on it? Here is the script and I am also attaching the pdb. sc XYZIN F7-2_refine_113.pdb <<eof-sc MOLECULE 1 CHAIN A CHAIN B MOLECULE 2 CHAIN C eof-sc Thanks in advance!! Sneha From: Randy Read [mailto:[email protected]] Sent: Tuesday, April 21, 2015 3:42 AM To: Sneha Rangarajan Subject: Re: [phenixbb] citation Dear Sneha, Here's a link to the publication (which is open access): http://scripts.iucr.org/cgi-bin/paper?ba5210. Best wishes, Randy Read On 20 Apr 2015, at 19:02, Sneha Rangarajan <rsneha(a)umd.edu<mailto:[email protected]>> wrote: Hello, What is the correct way to cite Phenix MRage? Thanks, Sneha _______________________________________________ phenixbb mailing list phenixbb(a)phenix-online.org<mailto:[email protected]> http://phenix-online.org/mailman/listinfo/phenixbb Unsubscribe: phenixbb-leave(a)phenix-online.org<mailto:[email protected]> ------ Randy J. Read Department of Haematology, University of Cambridge Cambridge Institute for Medical Research Tel: + 44 1223 336500 Wellcome Trust/MRC Building Fax: + 44 1223 336827 Hills Road E-mail: rjr27(a)cam.ac.uk<mailto:[email protected]> Cambridge CB2 0XY, U.K. www-structmed.cimr.cam.ac.uk<http://www-structmed.cimr.cam.ac.uk>

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rigid_body refinement
by Irina PROKHOROVA 24 Apr '15

24 Apr '15

Hello, how can i select two chains to be refined as one rigid body? I tried refinement.refine.sites { rigid_body = chain A and chain B } but it did not work. Irina

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on Cutting out density by Phenix
by Smith Liu 23 Apr '15

23 Apr '15

Dear All, I have tried to cut out the density by the Phenix graphical interface with the cutout type as model, but I find in the cut out map, there is more density arond the residues than in the input mtz map, here I mean, take a Lys residue as an example, in the input map, from Calpha there is about 1/2 of the sidechain was surrounded by the density, but in the cutting out map, there is about 2/3 of the sidechain was surrounded by the density. Will you please tell me if I want to get the cutting out density in the model cutout type, how can I have the cutting out density looks exactly or very close to the input density in the input mtz? Smith

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Generating cif file for DNA basepairing in PHENIX
by 李翔 22 Apr '15

22 Apr '15

Hi everyone, I am trying to build some DNA duplex models with different pitches by 3DNA. After changing the pitches from the original duplex model, I refined the duplex in PHENIX with geometry minimization. However, the basepairing get completely distorted. Is there a quick way to generate the cif file for basepairing in PHENIX or are there any other better ways to keep the basepairing restraint during the model refinement? Thank you very much for your kind help! Sincerely, Xiang -- Li Xiang Department of chemistry, University of Michigan Email：lixiang1642(a)gmail.com

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on the convergence of the Phenix refine
by Smith Liu 22 Apr '15

22 Apr '15

Dear All, Suppose I have a refine of 10 cycles, it get stablized from cycle 7. But sometimes I noticed that from the end of the cycle 10 to the end of the whole refinement, the stablization from 7 to cycle 10 can be destroyed a little, which makes me concern whether the final refinement can be regarded as convergent or not. Will you please explain why the stablization from 7 to cycle 10 can be destroyed a little from the end of cycle 10 to the end of the whole refinement? More critically, in the other situation, suppose I have a refine of 10 cycles, it get relatively stablized from cycle 5, from the end of cycle 5 to the end of cycle 10 the Rfree increase very slightly each cycle of the refine, which makes at the end of cycle 10 the Rfree is slightly higher than the Rfree at the start of the whole refinement. But from the end of cylce 10 to the end of the whole refinement, there is a slight decrease of Rfree, which makes the Rfree at the end of the whole refinement slightly lower than Rfree at the start of the whole refinement. It seems to increase the cycles of the refinement would not help further. Will you please explain the above phenomenon and to see whether the refine result can be acceptable, or do you have any suggestions for improvement? Smith

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Off-topic: Hydrogen images
by mohamed noor 21 Apr '15

21 Apr '15

Dear all I will be presenting about protein crystallography to a group of PhD-level physicists and need some images from the community. Would anyone have high-quality images of density maps that show hydrogen atoms at 1. high and ultra-high X-ray resolution (say, about 1.2 A to about 0.5 A) 2. low or medium X-ray resolution (where H atoms are not visible) compared with neutron data (with H). Ideally these images should be from the same protein so that I can show the power of complementary beam source for the diffraction. A side question - what is the community's preference to get deuterated samples? Is it crystal soaking or growing E. coli in deuterium? All contributions will be credited. Thanks.

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citation
by Sneha Rangarajan 21 Apr '15

21 Apr '15

Hello, What is the correct way to cite Phenix MRage? Thanks, Sneha

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Standard settings for map generation in phenix.refine
by Tristan Croll 21 Apr '15

21 Apr '15

Hi all, In the phenix.refine GUI, the default options for the maps auto-generated in Coot include the R-free set in the map coefficients. Is this the best choice? It's fairly natural for the user to immediately inspect/correct their structure using the helpfully-provided Coot window - which, as per a recent discussion thread on this list, can easily lead to over-fitting. I suspect I've been looking at such a case over the last week or so - a mid-3A structure refined in Phenix with an amazingly low Rfree (0.234) and Rfree-Rwork (~0.016), despite clear (albeit non-disastrous) errors in a number of loops, and moderate-poor statistics in structural quality metrics. Tellingly, the Rfree goes up quite substantially upon re-refinement after correcting these issues. If maps generated with the Rfree set included should only ever be used for final display, wouldn't it be better to have them excluded by default? Best regards, Tristan Tristan Croll Lecturer Faculty of Health School of Biomedical Sciences Institute of Health and Biomedical Engineering Queensland University of Technology 60 Musk Ave Kelvin Grove QLD 4059 Australia +61 7 3138 6443 This email and its attachments (if any) contain confidential information intended for use by the addressee and may be privileged. We do not waive any confidentiality, privilege or copyright associated with the email or the attachments. If you are not the intended addressee, you must not use, transmit, disclose or copy the email or any attachments. If you receive this email by mistake, please notify the sender immediately and delete the original email.

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on importing CIF structure factors and cutting out density
by Smith Liu 21 Apr '15

21 Apr '15

Dear All, By importing CIF structure factors of the Phenix graphical interface, I converted a CIF file to a mtz file. But when I tried to cutting out the density by Phenix with the converted mtz file, it request the map labels, which the converted mtz file seems does not have. Will you please let me know how to have the issue settles? Smith

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