- phenixbb - phenix-online.org

Global real-space refinement
by oleg＠quantumbioinc.com 27 Apr '15

27 Apr '15

I have a question. What does trigger Global real-space refinement ? I never seen it before except one structure I am currently working on. Also I do not see any options that switch on/off "Global real-space refinement " Please advise Oleg

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Automatic linking of glycans doesn't work when hydrogens are added by ReadySet
by Tristan Croll 27 Apr '15

27 Apr '15

Hi, I'm currently using the dev 2000 version of Phenix, and noticed an issue with the automatic linking of N-linked (and presumably O-linked) glycans. If you feed a glycosylated structure sans hydrogens to Phenix and allow ReadySet to add hydrogens prior to refinement, it adds hydrogens as if the glycans are unlinked. Then, the automatic linking script rejects them due to valence issues. Cheers, Tristan

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idealizing structure
by PC 27 Apr '15

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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phenix refinement of cryoEM data
by Ali Malay 17 Apr '15

17 Apr '15

Dear all, I am a relative newcomer to Phenix. I have a large multimeric protein structure docked into an electron density map, and I would like to further refine it by rigid-body refinement using Phenix. Is this a realistic strategy? I have made some attempts, first by converting the .mrc map file to .mtz as outlined here: https://www.phenix-online.org/documentation/reference/map_to_structure_fact… <https://www.phenix-online.org/documentation/reference/map_to_structure_fact…> Then I tried to refine using rigid body refinement in Phenix. However, the program quits but doesn’t really tell me why. Here’s the last part of the log file: Number of unique models: 24 Time building chain proxies: 36.85, per 1000 atoms: 0.26 Number of scatterers: 142296 At special positions: 0 Unit cell: (342, 342, 342, 90, 90, 90) Space group: P 1 (No. 1) Number of sites at special positions: 0 Number of scattering types: 4 Type Number sf(0) S 264 16.00 O 27720 8.00 N 25872 7.00 C 88440 6.00 sf(0) = scattering factor at diffraction angle 0. Writing MTZ file: /Users/xxx/Documents/Phenix/TEST/Refine_1/Test_refine_data.mtz Sorry Can anyone give me any ideas as to what went wrong? Also, is there a better way to do this? Thanks very much in advance!! A.M.

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find difference peaks
by Alejandro Virrueta 16 Apr '15

16 Apr '15

Hello, I'm working on a small project, and need some feedback. I am trying to rebuild methionine side-chains by looking at the difference peaks for a given Fo-Fc map. I envision a process as follows: 1. Delete the MET side-chain of a PDB file 2. Refine structure to get Fo-Fc map 3. Get a list of the peak positions relative to the coordinates of the PDB file I used 4. Filter list by keeping peaks near the MET C alpha/beta PDB coordinate. 5. Try to rebuild side-chain after anchoring the sulfur atom (assuming sulfur is located at the highest peak and within some distance to C beta) What functions should I use to achieve step 3? I am also trying to implement this process within the ringer program (phenix/cctbx_project/mmtbx/command_line/ringer.py). If anyone is familiar with this, what commands would work best within this ringer program? i.e. what functions can operate on difference_map (which is sampled by a point using tricubic_interpolation under 'def sample_angle')? I hope this makes some sense to someone. Thanks! Alex

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reflections file editor
by Almudena Ponce Salvatierra 14 Apr '15

14 Apr '15

Dear all, I would like to merge two datasets containing anomalous signal. If have done so earlier for native data within phenix in the reflections editor by selecting the arrays corresponding to FP and SIGFP and then running the program. However when I try to do so for the anomalous datasets it writes FP SIGFP and FP2 SIGFP2 instead or merging them, so it does with the anomalous signal... so I guess I have basically only one file containing two datasets but not a merged dataset. How can I solve it? Would it be possible, on the other hand, to merge a dataset with anomalous signal with a native one? The intention behind is to extend the resolution to the one of the native data. Best, Almudena -- Almudena Ponce-Salvatierra Macromolecular crystallography and Nucleic acid chemistry Max Planck Institute for Biophysical Chemistry Am Fassberg 11 37077 Göttingen Germany

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sugar puckering refinement with phenix refine
by Almudena Ponce Salvatierra 14 Apr '15

14 Apr '15

Dear all, does anyone know how phenix.refine deals with the sugar puckering of an RNA or a DNA strand? Does it refine it? Or does it leave it as it was built? Thank you very much in advance. Best wishes, Almudena -- Almudena Ponce-Salvatierra Macromolecular crystallography and Nucleic acid chemistry Max Planck Institute for Biophysical Chemistry Am Fassberg 11 37077 Göttingen Germany

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Link NGA and THR
by Cory Brooks 13 Apr '15

13 Apr '15

Hello! I am refining a structure with O-link glycosylation (GalNAc linked to Thr). Phenix seems to remove the link during refinement. Can anyone suggest a solution that will maintain the bond during refinement? Regards, Cory Cory Brooks,Ph.D.

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elbow-readyset
by Tarek DawoD 13 Apr '15

13 Apr '15

Dear All if i have pdb file for CdCl2, how could i generate cif file (to use later in phenix.refine) from that using readyset or elbow or any other tool.i could not find 3 letter could for CdCl2. COMPND UNNAMED AUTHOR GENERATED BY OPEN BABEL 2.3.1 HETATM 1 CD LIG 1 0.994 8.428 20.546 1.00 0.00 Cd HETATM 2 CL1 LIG 1 -0.441 6.507 20.373 1.00 0.00 Cl HETATM 3 CL2 LIG 1 3.190 7.731 21.231 1.00 0.00 Cl END Thank you for Help.regardsTK_DawoD

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Submit your abstract for the ACA Annual meeting in Philadelphia July 25-29, 2015
by Terwilliger, Thomas Charles 13 Apr '15

13 Apr '15

Hi Phenix users! You are invited to the ACA meeting in Philadelphia! Abstracts are still being accepted (see the invitation below). All the best, Tom T Tom Terwilliger Vice President, ACA Abstracts still being accepted ACA 2015 Meeting - July 25-29 Philadelphia, PA Is this email not displaying correctly? View it in your browser<http://us2.campaign-archive2.com/?u=3e43dd9d1724b97d2bc286881&id=0f524b9d2c…>. [https://gallery.mailchimp.com/3e43dd9d1724b97d2bc286881/images/2a8238a9-d30…] [http://www.amercrystalassn.org/2015-mtg-homepage]<http://amercrystalassn.us2.list-manage.com/track/click?u=3e43dd9d1724b97d2b…> ABSTRACT SUBMISSION DEADLINE IS EXTENDED ACA Annual Meeting • Philadelphia, PA • July 25 - 29, 2015 Submit abstract now to be considered for an oral presentation. Once all the lectures are scheduled, abstracts will continue to be accepted for poster presentations. [https://gallery.mailchimp.com/3e43dd9d1724b97d2bc286881/images/21952137-733…] Exhibit Show<http://amercrystalassn.us2.list-manage.com/track/click?u=3e43dd9d1724b97d2b…> First-time exhibitors receive 25% discount Discount rates for Not-for profits Corporate Members receive an additional discount Coffee breaks & poster sessions held in the exhibit hall to offer multiple opportunities to reach your target audience Your website linked on the meeting page Free listing in ACA RefleXions and Program & Show Guides Special sponsorships for Exhibitors only [https://gallery.mailchimp.com/3e43dd9d1724b97d2bc286881/images/d9f63f39-b8b…] Call for Papers:<http://amercrystalassn.us2.list-manage.com/track/click?u=3e43dd9d1724b97d2b…> 40% of talks selected from contributed abstracts No abstract submission fee Lower registration fees for members Sessions for students & young scientists on career directions, reviewer practices & more Full scientific program:www.AmerCrystalAssn.org<http://amercrystalassn.us2.list-manage1.com/track/click?u=3e43dd9d1724b97d2…> [https://gallery.mailchimp.com/3e43dd9d1724b97d2bc286881/images/961e8c70-86c…] Registration<http://amercrystalassn.us2.list-manage.com/track/click?u=3e43dd9d1724b97d2b…>: Join or pay membership dues and save on Registration fees Corporate Members receive advertising and exhibiting discounts Early bird rates until May 31 Online registration now open<http://amercrystalassn.us2.list-manage2.com/track/click?u=3e43dd9d1724b97d2…> follow on Twitter<Twitter%20Account%20not%20yet%20Authorized> | friend on Facebook | forward to a friend<http://us2.forward-to-friend.com/forward?u=3e43dd9d1724b97d2bc286881&id=0f5…> Copyright © 2014, AmericanCrystallographicAssn. All rights reserved. Our mailing address is: aca(a)hwi.buffalo.edu<mailto:[email protected]> ACA, PO Box 96, Buffalo, NY 14205 [Email Marketing Powered by MailChimp]<http://www.mailchimp.com/monkey-rewards/?utm_source=freemium_newsletter&utm…> unsubscribe from this list<http://amercrystalassn.us2.list-manage.com/unsubscribe?u=3e43dd9d1724b97d2b…> | update subscription preferences<http://amercrystalassn.us2.list-manage.com/profile?u=3e43dd9d1724b97d2bc286…>

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pdbtools: how to set the occupancy for an atom selection?
by Alejandro Virrueta 13 Apr '15

13 Apr '15

Hello, I was wondering if someone could show me a way to set the occupancy of a specific set of atoms to 0 using phenix.pdbtools. I noticed here <http://www.phenix-online.org/download/documentation/cci_apps/pdbtools.html#…> that there is no option under modify => occupancies to do an 'atom_selection'. Any help would be appreciated. Cheers, Alex

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Deposition question
by mohamed noor 13 Apr '15

13 Apr '15

Dear all I solved my structure using SAD from heme to 2 A and then did molecular replacement with a dataset diffracting to 1.2 A. Do I deposit only the mtz and pdb file from the last refinement run and report the corresponding statistics in 'Table 1'? Should I specify the experimental f' and f'' values? Thanks.

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expermiental sigma or SIGFP of the mtz file
by Smith Lee 13 Apr '15

13 Apr '15

Dear All, Will you please let me know what is the expermiental sigma or SIGFP of the mtz file? If a mtz file lacks the expermiental sigma or SIGFP, what does it mean? I am looking forward to getting your reply. Smith

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Reference model restraints in real space refinement?
by Oliver Clarke 12 Apr '15

12 Apr '15

Hi all, Is it possible to use reference model restraints at the moment during real space refinement (in phenix.real_space_refine)? I can’t see it in the documentation. On a related note, would it be possible at some point to allow users to set d_max in the phenix.map_to_structure_factors utility? At the moment it seems like the user can set d_min but not d_max - sometimes it is convenient to restrict the low res to 20 or 50Å, rather than the whole box size of an EM-map, which is the default. Best, Oliver.

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Phenix command to align the PDB sequence and input sequence
by Smith Liu 11 Apr '15

11 Apr '15

Dear All, Will you please tell me the Phenix command to align the PDB sequence and input sequence? I am looking forward to getting your reply. Smith

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Error refining with ramachandran restraints
by Oliver Clarke 10 Apr '15

10 Apr '15

Hi all, When I attempt to run a refinement using phenix.refine from the command line, using the parameter “ramachandran_restraints=true”, in the latest nightly build of phenix (dev-2006), I get the following error: ========================== Anomalous scatterer groups ========================= All atoms refined with f_prime=0 and f_double_prime=0. Traceback (most recent call last): File "/Applications/phenix-dev-2006/build/../modules/phenix/phenix/command_line/refine.py", line 11, in <module> command_line.run(command_name="phenix.refine", args=sys.argv[1:]) File "/Applications/phenix-dev-2006/modules/phenix/phenix/refinement/command_line.py", line 96, in run master_params=customized_master_params) File "/Applications/phenix-dev-2006/modules/phenix/phenix/refinement/driver.py", line 272, in __init__ secondary_structure_manager=self.sec_str, AttributeError: refine instance has no attribute 'sec_str' This happens for two different structures, so I don’t think it is a structure-specific thing, and I don’t recall this happening in older builds of phenix. The refinement runs fine if I don’t specify ramachandran restraints. Is there something obvious I am doing wrong? Best, Oliver.

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