- phenixbb - phenix-online.org

Find Difference peaks and holes
by John Rose 03 May '13

03 May '13

Hi, I can't seem to find the "Find Difference peaks and holes" utility in the PHENIX 1.8.2-1309 distribution. I found it to be very useful. Can you tell me where it is hiding. Regards, John John Rose Ph.D. Associate Professor B204B, The Fred C. Davison Life Sciences Complex 120 Green Street Department of Biochemistry and Molecular Biology University of Georgia Athens, GA 30602-7229 ========================================= Phone: 706-542-1750 Fax: 706-542-3077

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ReadySet & phenix.refine problem: NAG-Asn with hydrogen atoms
by Zhijie Li 30 Apr '13

30 Apr '13

Hello, I am refining my structure with hydrogen atoms on (phenix 1.8.2-1309). The protein contains two Asn-linked GlcNAc. I noticed two problems with respect to the NAG-Asn linkage in the presence of hydrogen atoms: 1) After running ReadySet (to add hydrogen to the PDB ab initio), the H1 on the NAG is pointing to the amino group of Asn, ie, the NAG seems to be interpreted as in its alpha anomer instead of beta (should be GlcNAc beta1,N-Asn). This is not really a problem as it doesn't seem to affect the refinement. 2) The H21 in Asn is correctly removed by ReadySet, leaving only H22. However, if I send this PDB to phenix.refine, the refinement will fail almost instantly complaining that H22 of the Asn has an unknown nonbonded energy type symbol. But if I simply change the atom name of H22 to H21, the refinement will proceed to completion with no problem, only leaving an H21 at the position where H22 should be. I was not sure what caused this error. So I trimmed my PDBs down to the Asn and NAG only, and fed the small PDB to ReadySet and phenix.refine (with an eff file indicating the NAG-Asn linkage) and got the same behavior: H22 on Asn - error; H21 on Asn - OK. I hope someone can look into this. Thanks in advance. Zhijie

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SIGF in refinement
by Aksyuk, Anastasia (NIH/NIAMS) [F] 29 Apr '13

29 Apr '13

Hi, I was wondering how SigFobs values are used in phenix refinement and how important those are. I am asking in view of P1 space group with low redundancy or even cryo-EM map based Fobs. Maybe you can point me to a useful reference on likelihood targets. I feel lost in those that I have. Thanks, --Anastasia ------------------------------ Anastasia A Aksyuk, PhD Laboratory of Structural Biology, NIAMS Bldg 50, Room 1511, 50 South Drive MSC 8025 N.I.H., Bethesda, MD 20892-8025 tel 301 451-8247 e-mail: anastasia.aksyuk(a)nih.gov

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Re: [phenixbb] clashscore discrepancies
by Alex Theodossis 27 Apr '13

27 Apr '13

Dear phenixbb, I have carried out refinement using the latest version of PHENIX, which gives improved molprobity stats. However, these stats still do not match those porvided by the molprobity server: PHENIX output Molprobity server Existing H-model Electron-cloud H-model All atom clashscore 2.57 4.2 (81st perc) 3.25 (88th percentile) Rotamer outliers 0.7 1.14 1.14 Overall score 1.04 1/24 (89th perc) 1.16 (93rd percentile) Given that PHENIX is now giving me the best results and all scenarios give reasonable results I am less inclined to be concerned. However, I still find these inconsistencies rather puzzling and am curious to learn what is causing them. Thanks in advance.

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phenix.elbow: Best ploy to generate restraints files for similar compounds ?
by Phil Jeffrey 26 Apr '13

26 Apr '13

I've got homologues of small molecule compounds I want to generate restraints for. The changes I'm looking at are converting O to S and moving a substituent around on a phenyl ring. I expect them to have similar conformations overall. Is the best method to: 1. create a new PDB file of the homolog, change atom types and do some primitive modeling, assuming that the --opt method will fix geometry snafus ~or~ 2. use a SMILES string, edit the numbering of the PDB file and regenerate the restraints from that Thanks Phil Jeffrey Princeton

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clashscore discrepancies
by Alex Theodossis 25 Apr '13

25 Apr '13

Dear phenixbb, Have refined a 1.05A structure with riding hydrogen model in phenix v1.8.1-1168 and doing final validation. The molprobity statistics output by phenix include: all atom clashscore = 4.12 Rotamer outliers = 0.71% Overall score = 1.2 Put through the molprobity server I am given the option of analysing with existing hydrogen model, or replacing with the 'electron-cloud parameters' they recommend for X-ray crystal structures. The results end up being very different: existing H model: electron-cloud model: All atom clash score: 4.66 (78th percentile) 3.72 (85th percentile) Poor rotamers: 1.14% 1.14% Overall score: 1.28 (88th percentile) 1.20 (92nd percentile) While all three scenarios give acceptable statistics, I am surprised by the inconsistency in the results given by molprobity, even when using the same hydrogen model. I am also wondering whether I am using a suboptimal riding model in my refinement (generated using phenix ready-set). Can anyone advise on the reason for these inconsistencies (is it just due to differences in the version of molprobity being run in each case). Is there anything I should be doing differently? Thanks in advance. On 18 November 2012 12:36, Alex Theodossis <alex.theodossis(a)monash.edu>wrote: > Hi, > > I'm attempting to install the latest version of phenix on mac 10.5.8, > using the command line installer. > > Installation proceeds well until towards the end, where it hangs on: > > precompiling .py files > > I can leave it for up to an hour without any further progress, but upon > typing: > > ctrl+c > > The installation comes back to life and proceeds to completion. > > Can anyone advise as to what might be causing this and on how reliable > this installation is going to be? > > Thanks in advance. > > >

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Postdoctoral positions in structure and function of membrane proteins at the NIH
by Anirban Banerjee 25 Apr '13

25 Apr '13

Dear all, Will you please bring this to the attention of suitable candidates ? Postdoctoral positions in structure and function of membrane proteins at the NIH The research group of Dr. Anirban Banerjee at the National Institutes of Health (NIH) is seeking candidates for postdoctoral fellows to start from September, 2013 or later. The broad interests of the lab are in membrane protein structure and function. We will combine macromolecular crystallography with functional assays with detergent-solubilized and liposome-reconstituted proteins to investigate the structural bases of the mechanisms of a number of membrane proteins. The lab is part of the Cell Biology and Metabolism (CBMP) program and is part of a large and diverse macromolecular crystallography and NMR community in the NIH campus. There is ample opportunity to interact with other scientific groups across a broad range of scientific disciplines. CBMP is part of the National Institute of Child Health and Human Development (NICHD). Our lab also has an affiliation to the National Institute of Neurological Disorders and Stroke (NINDS). The DC Metro area is a wonderful place to live, the weather is pleasant and the NIH is a vibrant international community. Candidates must be motivated and have a strong background in biochemistry and structural biology. Experience with protein expression, purification and crystallization is required. Prior experience in membrane protein biochemistry will be an added advantage. Candidates should hold a Ph.D. degree by the time they join and have no more than one year of postdoctoral experience at the time of applying. To apply, please send an email of interest to anirban.banerjee(a)nih.gov with a CV and a summary of previous research experience and future research interests. Best regards, Anirban

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install problem on Ubuntu 12.10
by Guan Hong Hsiang 25 Apr '13

25 Apr '13

Dear all: When I wanted to install phenix on my computer with ubuntu 12.10 (./install), the error message showed that "/usr/local/phenix-installer-1.8.2-1309/bin/install-from-binary:130:export:6 core : bad variable name. I am a newbie of phenix. Could anyone give me some suggestion? Thank you Hong-Hsiang

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phenix.refine - blocking sorry error
by Maxime Cuypers 24 Apr '13

24 Apr '13

hello, i just installed the latest buid of phenix : 1356 i now get the following error in phenix.refine - this was ok with previous version ' Sorry: Your refinement strategy includes anisotropic ADPs for hydrogen atoms refined individually; hydrogens should be left as isotropic even for individual refinement. ' which is the new specific command to add to the .params file that will force anisotropic refinement of deuteriums please? PS: this is needed for my neutron structure refinement. thanks for your help -- Dr. Maxime Cuypers Institut Laue Langevin (ILL), Deuteration lab Rue Jules Horowitz, 6, BP 156 38042 Grenoble cedex 9 France

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Clashes while searching second copy using phaser.AUTOMR
by Rojan Shrestha 23 Apr '13

23 Apr '13

Hello, I have same problem as in the following link which is the previous thread in this bb. If you solved the problem who posted, please let me know the solution how it can be tackled. http://www.phenix-online.org/pipermail/phenixbb/2009-April/013136.html I am trying to find 6 copies in ASU. The space group of diffraction set is P3121. I have obtained one copy with high TFZ scores (18.5) without clashes. However, while searching for second copy, Phaser gave so many clashes with no solution. As I read in above thread, it could be due to parallel pseudo-translation symmetry. Can somebody suggest me to overcome this type of problem? Regards, Rojan

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