- phenixbb - phenix-online.org

definition of glycosylation in phenix.refine
by Laurent Maveyraud 18 Nov '14

18 Nov '14

Hi, I am currently refining a structure of a glycosylated protein, but I fail to define the appropriate links... The glycosylatin is Asn638-NAG1061-(beta1-4)-NAG1062-(beta1-4)-BMA1063-(ALPHA1-3)-MAN1064 This is what I add in the eff file : apply_cif_link { data_link = NAG-ASN residue_selection_1 = chain D and resname NAG and resid 1061 residue_selection_2 = chain A and resname ASN and resid 638 } apply_cif_link { data_link = BETA1-4 residue_selection_1 = chain D and resname NAG and resid 1062 residue_selection_2 = chain D and resname NAG and resid 1061 } apply_cif_link { data_link = BETA1-4 residue_selection_1 = chain D and resname BMA and resid 1063 residue_selection_2 = chain D and resname NAG and resid 1062 } apply_cif_link { data_link = ALPHA1-3 residue_selection_1 = chain D and resname MAN and resid 1064 residue_selection_2 = chain D and resname BMA and resid 1063 } this is correctly read in refine: apply_cif_link: data_link: NAG-ASN mod_id_1: DEL-O1 mod_id_2: DEL-HD22 residue_selection_1: chain D and resname NAG and resid 1061 residue_selection_2: chain A and resname ASN and resid 638 apply_cif_link: data_link: BETA1-4 mod_id_1: DEL-HO4 mod_id_2: DEL-O1 residue_selection_1: chain D and resname NAG and resid 1062 residue_selection_2: chain D and resname NAG and resid 1061 apply_cif_link: data_link: BETA1-4 mod_id_1: DEL-HO4 mod_id_2: DEL-O1 residue_selection_1: chain D and resname BMA and resid 1063 residue_selection_2: chain D and resname NAG and resid 1062 apply_cif_link: data_link: ALPHA1-3 mod_id_1: DEL-HO3 mod_id_2: DEL-O1 residue_selection_1: chain D and resname MAN and resid 1064 residue_selection_2: chain D and resname BMA and resid 1063 but generates an error : Number of atoms with unknown nonbonded energy type symbols: 5 "HETATM10951 HO4 NAG D1052 .*. H " "HETATM10973 HO4 BMA D1053 .*. H " "HETATM11028 HO4 NAG D1062 .*. H " "HETATM11050 HO4 BMA D1063 .*. H " "HETATM11070 HO3 MAN D1064 .*. H " and the job stops. Any ideas on what if wrong ? thanks for your help Laurent -- ---------------------------------------------------------- Laurent Maveyraud laurent.maveyraud AT ipbs DOT fr P I C T --- Plateforme Intégrée de Criblage de Toulouse Université Paul Sabatier / CNRS / I.P.B.S. UMR 5089 Département Biologie Structurale et Biophysique http://cribligand.ipbs.fr http://www.ipbs.fr 205 route de Narbonne 31077 TOULOUSE Cedex FRANCE Tél: +33 (0)561 175 435 Fax : +33 (0)561 175 994 ----------------------------------------------------------

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mrage with nucleic acids?
by Paul Paukstelis 17 Nov '14

17 Nov '14

I'm trying to run mrage with nucleic acid models. With phaser, it is possible to specify the molecule type, but this option doesn't exist in mrage (from what I can see). Providing a sequence file automatically assumes protein one letter codes. Any suggestion on how to clearly define a sequence file as a nucleic acid? Thanks, --paul

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Filtering CCP4 maps to lower resolution
by Barad, Ben 16 Nov '14

16 Nov '14

Hi All, I am currently trying to filter a CCP4-formatted real space map from the EMDB, which is at 3.2 Å resolution, to different resolutions from 3.2 to 5 Å, and I've been having a bit of a difficult time getting it to work. My first thought was to do an fft to get structure factors, then regenerate the map from those structure factors with a resolution cutoff. To do this, I used the tools "phenix.map_to_structure_factors" and "phenix.mtz2map" to generate a structure factor file, then convert it back into a map. When I do this, I end up with a very noisy map that is not usable for what I would like to do. Is there a better way to accomplish this in phenix (or another tool)? I've also tried some low-pass filtering with proc3d, without much success... Thanks, Ben Barad Fraser Lab @ UCSF

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Re: [phenixbb] simulated annealing omit map
by Pavel Afonine 15 Nov '14

15 Nov '14

Hello Bishal, as discussed before, computing ligand-omit map is tricky. Quoting my previous email: """ There are two commonly used options for omitting the ligand in order to demonstrate its presence/absence in Fo-Fc OMIT map: 1) Physically remove the ligand from PDB file. Then do some refinement and calculate Fo-Fc map. 2) Keep ligand in the file, set its occupancy to zero. Then, again, do some refinement and calculate Fo-Fc map. In this case you may want to ask refinement program to not move the ligand or move it only a little. Now, here is why these two options are poor and will not give you what you want. In the first case the bulk-solvent mask will be set in the ligand region and therefore it will mask ligand density (bulk-solvent will be filled into the ligand region). Depending on the strength of ligand density it may be masked completely or deteriorated. If you follow the second option you will always get positive density in ligand area. This density may correspond to bulk-solvent, ligand or mixture of both. That is there will be no simple way to differentiate whether this density arises from the ligand or bulk-solvent. """ Dale Tronrud offered a great alternative option: """ An alternative you might want to consider is what I call the "discovery map". At some point in the refinement process there was a map that convinced YOU that this ligand was present. You should be the hardest person to be convinced so that map will be both an omit map (because the model had been refined without the ligand prior to this) and clear enough to satisfy the reader. """ Now, recently I improved composite OMIT map calculation in phenix.composite_omit_map tool, see picture that illustrates how it works: https://www.dropbox.com/s/dbp8e0348v5p78h/fig_6.png?dl=0 I think at present that's the best option to follow if for some reason you cannot follow Dale's suggestion. Pavel On 11/13/14 6:58 AM, Singh, Bishal wrote: > Hello everybody, > I am generating figures showing the electron density map around the > ligands. I deleted the ligands from final co-ordinate file and then > performed refinement with identical parameters as before while > keeping simulated annealing=true. I shall be thankful if someone could > suggest me whether I consider mFo-DFc map or 2mFo-DFc map or both. > Kindly also tell me the minimum acceptable contour level required for > showing difference map. All structures are at 1.4 - 2.0 angstrom > resolutions. > > Regards, > Bishal

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CB outliers
by George Devaniranjan 14 Nov '14

14 Nov '14

Hi, I refined a structure using phenix.refine. The R/R free decreased slightly from 13.46/15.87 to 13.0/15.6. But, molprobity said there were 3 CB outliers (starting from 0). I looked at those residues in COOT. I could NOT really see a different between the refined and initial model. In addition I looked at COOT validate-->density fit analysis I cannot see ANY difference in the peak heights (same numerical value too). I looked at RSCC (using phenix validate tools as well). I still can't see a difference in the plots. I am not sure how to get rid of the 3 CB outliers that have crept in since I can't pick them out as worse off in the refined model. I ask since in another case > 3 CB outliers, with the same results in picking them out in COOT/RSCC. I am wondering if there is another way I can see the deviation and fix it? Thank you, George

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Rosetta compile problem
by miyatake 13 Nov '14

13 Nov '14

Dear all, I tried to compile Rosetta for rosetta_refinement, on Mac OX10.10. I run " /rosetta_2014.22.56873_bundle/main/source] user% sudo scons.py But it was in failure, showing the following message: g++-4.2 -o build/external/debug/macos/14.0/64/x86/gcc/4.2/default/dbio/cppdb/atomic_counter.os -c -isystem external/boost_1_55_0/ -isystem external/include/ -isystem external/dbio/ -pipe -ffor-scope -Wall -Wextra -pedantic -Werror -Wno-long-long -Wno-strict-aliasing -m64 -march=nocona -mtune=generic -O0 -g -ggdb -ffloat-store -fPIC -DBOOST_ERROR_CODE_HEADER_ONLY -DBOOST_SYSTEM_NO_DEPRECATED -DCPPDB_EXPORTS -DCPPDB_LIBRARY_SUFFIX=\".dylib\" -DCPPDB_LIBRARY_PREFIX=\"lib\" -DCPPDB_DISABLE_SHARED_OBJECT_LOADING -DCPPDB_DISABLE_THREAD_SAFETY -DCPPDB_SOVERSION=\"0\" -DCPPDB_MAJOR=0 -DCPPDB_MINOR=3 -DCPPDB_PATCH=0 -DCPPDB_VERSION=\"0.3.0\" -DCPPDB_WITH_SQLITE3 -Ibuild/external/debug/macos/14.0/64/x86/gcc/4.2/default/dbio/sqlite3 -Iexternal/dbio/sqlite3 -Iexternal/boost_1_55_0 -Iexternal/dbio -I/usr/include -I/usr/local/include external/dbio/cppdb/atomic_counter.cpp sh: g++-4.2: command not found scons: *** [build/external/debug/macos/14.0/64/x86/gcc/4.2/default/dbio/cppdb/atomic_counter.os] Error 127 scons: building terminated because of errors. How can I resolve that? Best regards, H. Miyatake

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simulated annealing omit map
by Singh, Bishal 13 Nov '14

13 Nov '14

Hello everybody, I am generating figures showing the electron density map around the ligands. I deleted the ligands from final co-ordinate file and then performed refinement with identical parameters as before while keeping simulated annealing=true. I shall be thankful if someone could suggest me whether I consider mFo-DFc map or 2mFo-DFc map or both. Kindly also tell me the minimum acceptable contour level required for showing difference map. All structures are at 1.4 - 2.0 angstrom resolutions. Regards, Bishal

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Settings-Directories of MR-Rosetta wizard is altered when phenix-GUI is restarted?
by Martin Moche 13 Nov '14

13 Nov '14

Dear colleagues, When restarting phenix followed by opening the "MR-Rosetta(beta)" the Settings-Directories need to be reset each time? How can I set Rosetta binary directory name: Rosetta binary name: Rosetta script directory name: Rosetta database directory name: in Settings-Directories of "MR-Rosetta(beta)" wizard (or elsewhere) so that they do not change each time I restart the phenix-GUI? These settings are not changed: Base output folder: Rosetta path: Likely "Rosetta path" does not change between phenix-GUI restarts since PHENIX_ROSETTA_PATH is set in the shell as: echo $PHENIX_ROSETTA_PATH /software/apps/rosetta/2014.35/gcc01/rosetta_2014.35.57232_bundle The "Path to Rosetta" in "Phenix preferences - Wizards" is currently left blank since $PHENIX_ROSETTA_PATH is set in the shell. I have by accident started a few jobs with mixed (new and old) settings and phenix-GUI starts without error messages and all processors are running 100% CPU, however likely in some infinite loop since no work is performed beyond "place model"... Best regards, Martin Martin Moche, Ph.D. Head of Protein Crystallography Karolinska Institutet MBB/PSF Scheeles väg 2 171 77 Stockholm Sweden phone: +46-8-524 868 43 mobile: +46-73-322 93 27 fax: +46-8-524 868 68 email: Martin.Moche(a)ki.se

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fix atoms during refinement
by CPMAS Chen 10 Nov '14

10 Nov '14

Dear All Phenix Users, Is there a way to fix certain atoms position during refinement? I have some heavy atoms identified with MR-SAD, but when I build the whole molecule and have phenix to refine its position, the heavy atom's position is shifted from the anomalous signal. Therefore I would like to have these heavy atoms positions fixed during refinement. Thanks! Charles -- *************************************************** Charles Chen Research Associate University of Pittsburgh School of Medicine Department of Anesthesiology ******************************************************

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Ringer
by Ivan IVANOV 10 Nov '14

10 Nov '14

Dear All, I am trying to use ringer with a model I have. I followed the tutorial for Calmodulin and it worked very well for my protein. (http://bl831.als.lbl.gov/ringer/ringer/Tutorial/tutorial.htm). Now I have all files sigma vs chi angles for the residues I want and also the list of peaks identified above the sigma cutoff I selected. I am struggling to analyse the outputs as it is shown on the calmodulin exemple. I found this website (http://bl831.als.lbl.gov/ringer/ringer/Documentation/ringerManual.htm#Userp…) which is explaining very briefly how to plot all different conformation vs chi angles and how to show all selected amino acid conformation in the electron density (4.4 Plotting Accessory). I have to admit that this is not straigthforward for me to plot all outputs in a comprehensive way. Does anyone of you have a script to run with ringer outputs and get the final figures as it is shown on both websites ?? Kind regards, Ivan -- Ivan Ivanov, PhD PostDoctoral fellow at EMBL, European Molecular Biology Laboratory, Structural biology of RNA-protein complexes, Dr. Stephen Cusack, EMBL 71, avenue des Martyrs CS 90181 38042 Grenoble Cedex 9 T: +33 (0)4 76 20 7630 T(lab): +33 (0)4 76 20 7014 Email: ivanov(a)embl.fr Url: http://www.embl.fr

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"Femtosecond crystallography of membrane proteins in lipidic cubic phase (LCP)” Webinar
by Angela Criswell 04 Nov '14

04 Nov '14

Dear colleagues, I would like to draw your attention to an upcoming free, educational webinar to be presented by Dr. Wei Liu titled “Femtosecond crystallography of membrane proteins in lipidic cubic phase (LCP).” Despite recent technological advances in heterologous expression, stabilization and crystallization of membrane proteins, structural studies remain difficult. Wei’s presentation will describe the use of serial femtosecond crystallography of membrane proteins in LCP and how this approach holds promise to interrogate this difficult, yet important, class of proteins. This webinar is scheduled to occur on Thursday, November 13th at 11:00 AM CST (9:00 AM PST / 5:00 PM GMT). You can find an abstract and registration link for this webinar at: http://www.rigaku.com/webinars. We hope you will join us for the event. Best regards, Angela Criswell -- Angela Criswell VP, Life Science X-ray Products Rigaku Americas Corporation 9009 New Trails Drive The Woodlands, TX 77381 USA Ph: +1 281 362 2300 ext. 216 Fax: +1 281 364 3628 Email: angela.criswell(a)rigaku.com URL: http://www.rigaku.com Subscribe to Rigaku eNewsletters<http://www.rigaku.com/subscribe>

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green ball in aspartate
by Murpholino Peligro 31 Oct '14

31 Oct '14

Hi Everybody. Does anybody knows what could this be? Blue map at 1rmsd Green and red map at 3.5 rmsd Purple map (FEM map) at 1rmsd Conditions 100mM sodium acetate, NaCl 10% w/v, cryo=glycerol 30 % v/v; protein is hen egg white lysozyme (usual condition, usual protein and ohh..almost forget it.. ascorbic acid at 0.5 M) A water molecule overlaps with the oxygen atom (OD1) of the aspartate residue. So it is not a water molecule. Any ideas? (In coot -> validate-> difference map peaks and holes-> its the only one at 7.7 rmsd) Thanks

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[ot]: nedit on Mac 10.10 yosemite
by Sebastiano Pasqualato 29 Oct '14

29 Oct '14

Hi folks, sorry for the off-topic and slightly ‘demodée’ question, but, since I updated to Yosemite on my Mac, "nedit" does not work any more. Here’s the error message: Seba@host041:~> nedit dyld: Library not loaded: /usr/X11R6/lib/libXp.6.dylib Referenced from: /Applications/nedit/nedit Reason: image not found Trace/BPT trap: 5 Seba@host041:~> Anybody knows if there is a fix for that? Thanks in advance, S -- Sebastiano Pasqualato, PhD Crystallography Unit Department of Experimental Oncology European Institute of Oncology IFOM-IEO Campus via Adamello, 16 20139 - Milano Italy tel +39 02 9437 5167 fax +39 02 9437 5990 web http://is.gd/IEO_XtalUnit

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Fwd: Postdoc position in acoustic crystal preparation and high throughput screening at NSLS II
by Nathaniel Echols 28 Oct '14

28 Oct '14

---------- Forwarded message ---------- From: "Soares, Alexei" <soares(a)bnl.gov> To: "CCP4BB(a)JISCMAIL.AC.UK" <CCP4BB(a)jiscmail.ac.uk>, "cnsbb(a)yahoogroups.com" <cnsbb(a)yahoogroups.com>, "pdb-l(a)rcsb.org" <pdb-l(a)rcsb.org>, " phenixbb(a)phenix-online.org" <phenixbb(a)phenix-online.org>, " x-plor(a)net.bio.net" <x-plor(a)magpie.bio.indiana.edu>, "xtal-log(a)net.bio.net" <xtal-log(a)magpie.bio.indiana.edu> Cc: Date: Tue, 28 Oct 2014 14:44:30 +0000 Subject: Postdoc position in acoustic crystal preparation and high throughput screening at NSLS II *Postdoctoral Research Associate – Macromolecular Crystal Preparation for NSLS-II* *2-year Term Position* *BNL Overview:* Brookhaven National Laboratory is a nonprofit research and development institution whose purpose is to advance ideas and knowledge through a multidisciplinary program of basic and applied research. *Project Overview:* A postdoctoral position is available to develop new crystal-preparation technologies to advance the use of serial macromolecular crystallography (MX) at NSLS-II. This new synchrotron will soon begin operation at Brookhaven National Laboratory. The individual will develop technologies for crystallization, drug discovery, and crystal handling to make serial crystallography possible, using various technologies, including acoustic droplet ejection (ADE). The project will provide the capability for experimenters to employ nanoliter quantities of material to produce specimens for diffraction studies with a large number of discrete experiments in a small area. This will exploit the micro-beam capabilities of NSLS-II MX beamlines; both room temperature and cryogenic serial crystallography strategies will be explored. High-throughput screening will be used for different types of structural biology projects (crystallization conditions, fragment binding, etc). The individual will work closely with a broad technology-development team. Our team members have different areas of expertise, from 3D labware design to research on medically relevant expressed proteins. No experience with ADE is necessary. *Essential Duties and Responsibilities:* The successful candidate will assist in the development and implementation of procedures and computer algorithms that leverage the Echo 550 instrument for macromolecular crystallography applications for serial crystallography applications in the few-nanoliter regime. The candidate will also develop novel technologies as well as improve existing technologies, and will have opportunities to participate in other related projects in a large and diverse group. *Required Knowledge, Skills and Abilities:* - Ph.D. in an appropriate chemistry, biology, or physics discipline; structural biology, crystallography, or a related field will have preference - Demonstrated experience (preferably including publications) in innovative experimentation and/or methods development with crystallography or drug discovery - Experience with conventional crystallization, and familiarity with micro crystallization and handling of micro crystals will be valuable - Experience in computer programming - The candidate must have a demonstrated ability to work with a team. *Other Information:* BNL policy states that Research Associate appointments may be made to those who have received their doctoral degrees within the past five years. *Please apply to Job # 137 on our jobs website:* *http://www.bnl.gov/HR/careers/ <http://www.bnl.gov/HR/careers/> * At Brookhaven National Laboratory we believe that a comprehensive employee benefits program is an important and meaningful part of the compensation employees receive. Our benefits program includes but is not limited to: - Medical Plans - Vacation - Holidays - Dental Plans - Life Insurance - 401(k) Plan - On-site Child Development Center, Swimming Pool, Weight room Tennis Courts, and many other employee perks and benefits.

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R/R free reported values
by Cedric 28 Oct '14

28 Oct '14

Hi Phenix and CCP4 community, (sorry for the cross posting). I was looking at a PDB file. The http://www.rcsb.org/ website page gives the following values: R-Value: 0.103 (work) R-Free: 0.134 The actual PDB file gives the following: R :0.110 FREE R VALUE : 0.170 I was wondering why the difference. The structure is 1.0A resolution 2CWS. Thank you, ____________________________________________________________ FREE ONLINE PHOTOSHARING - Share your photos online with your friends and family! Visit http://www.inbox.com/photosharing to find out more!

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difference between phenix.mrage and phenix.MRage?
by Murpholino Peligro 27 Oct '14

27 Oct '14

? Thanks

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Cacodylate won't stay in place
by Kgosisejo, Oarabile 27 Oct '14

27 Oct '14

Hello all, I am trying to fit cacodylate ion in my model using Coot but it does not stay where I put it. The molecule breaks apart and some of its components attach to the peptide residues. Due to this, phenix.refine would not accept this as the input for refinement. Is there a way I can make cacodylate ion stay in its electron density and refine my structure with cacodylate ion? I appreciate your help! Best Regards, Oarabile M. Kgosisejo o.kgosisejo(a)usask.ca

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help on MIR dataset
by Ni, Fengyun 25 Oct '14

25 Oct '14

Hi everyone, I am working on a MIR dataset: one native data, three EMTS soaked data at different concentration, one PbAc2 data. My initial trial with phenix autosol did not give positive solutions. I hope I could get some information from all of you. I index and integrate the data in Mosflm and possible group is P3, though the Pointless said the most possible is P3121. But for now, I only tried P3 at different resolutions for the reason that a potential MR solution (below 20% identities, TFZ=7.1) was found in P31 space group. If P3121 is the real space group, the space is too crowed to fit my molecules unless they have some unexpected symmetry. For the difference among dataset in P3 space group, the output from SCALEIT of CCP4 gives as follows, RMS differences|RMSiso RMSano ---------------------------------------- FP-hg |172.30 22.50 FP-hg2 |159.20 24.07 FP-hg3 |85.08 27.92 FP-pb |31.15 24.55 The native data's resolution cutoff is 3.2 A, and 3.2/3.8/3.5 for different EMTS data, 3.5 for Pb data.I did notice some radiation damage for EMTS (Hg) data (large negative B-factors in SCALA), but not for Pb data. And the anomalous signal only extend to 5.6 and 4.5 A for EMTS and Pb data, respectively, as indicated by phenix.xtriage. These are all the possible heavy atom data we could obtain. So i tried all of them in phenix.autosol. The input is like follows, autosol { seq_file = ../seq.dat crystal_info { solvent_fraction = 0.62 #determined from matthews coefficient to assure "reasonable" content in asymmetric unit. } native { data = nat.mtz } deriv { data = hg1.mtz atom_type = Hg inano = noinano *inano anoonly lambda = 1.00394 } deriv { data = hg2.mtz atom_type = Hg inano = noinano *inano anoonly lambda = 1.00394 } deriv { data = hg3.mtz atom_type = Hg inano = noinano *inano anoonly lambda = 1.00394 } deriv { data = pb.mtz atom_type = Pb inano = noinano *inano anoonly lambda = 0.94640 } model_building { build = False #my structure is DNA/protein complex, so i choose to stop the building process. } } I tried at different resolutions, 3.6/4.0/4.4/4.8/5.2/5.6/6.0 A. One solution was given based on Pb data at 4.8 A with following statistics, Solution # 6 BAYES-CC: 59.7 +/- 17.2 (2SD) Dataset #4 FOM: 0.24 Score type: SKEW CORR_RMS NCS_OVERLAP Raw scores: 0.31 0.69 0.00 100x EST OF CC: 59.74 17.55 31.25 Refined heavy atom sites (fractional): X Y Z xyz 0.033 0.020 0.538 xyz 0.417 0.217 0.113 xyz 0.041 0.010 0.721 The statistics is almost the same for its inverse, and i read from the output that the statistics for phasing other Hg datasets are very low (BAYES-CC is lower than 20) based on the above solution. The resulting map does not make much sense yet. Sorry for the long post. Any suggestion is welcome. Thank you very much! Fengyun

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pdb deposition
by Sneha Rangarajan 24 Oct '14

24 Oct '14

Hi everyone, For a 1.9A dataset, here are my statistics- Rfactors: 22/26 Ramachandran favored: 90.60% Ramachandran outliers: 2.17% Rotamer outliers: 4% Clashscore: 8 Bonds: 0.007 Angles: 1.2 I have tried a couple of things to refine it further but nothing seems to improve all the parameters. My question is what is an acceptable Rfactor at this resolution for deposition in pdb? Thanks, Sneha

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how to refine everything except n residues in phenix.refine?
by Murpholino Peligro 22 Oct '14

22 Oct '14

Hi everybody! Everytime when I (within coot) do "real space refine" two arginines that have two alternate conformations ..(interacting by hydrogen bonds); and then phenix.refine everything, both conformers move away. Therefore, when I open my mtz and pdb files from phenix.refine in coot, I'll have green blobs where there should be guanidium groups. Can I tell phenix.refine not to move only those two residues? It should be something like the following lines in the eff file? sites { individual = None torsion_angles = None rigid_body = None remove_selection=resid 45 remove_selection=resid 68 } Thank you very much

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Electrostatic potential map/Delphi/PDB2PQR
by Ivan IVANOV 21 Oct '14

21 Oct '14

Dear All, I am facing a problem. I have a protein-RNA complex at 2A resolution I refined using TLS in Phenix. Now in the pdb file I have ANISOU line for every atom and probably many other errors. This is the reason I am not able to run Delphi or PDB2PQR to create potential electrostatic map. I removed already all water molecules and all heteratoms and ANISOU lines and RNA molecule. The program creating the phi file for the potentials does not work at all. Do you know any server which can correct any errors in the pdb file in order to run properly the program to create electrostatic map ?? Thanks a lot, Ivan -- Ivan Ivanov, PhD PostDoctoral fellow at EMBL, European Molecular Biology Laboratory, Structural biology of RNA-protein complexes, Dr. Stephen Cusack, EMBL 71, avenue des Martyrs CS 90181 38042 Grenoble Cedex 9 T: +33 (0)4 76 20 7630 T(lab): +33 (0)4 76 20 7014 Email: ivanov(a)embl.fr Url: http://www.embl.fr

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An old (?) tutorial?
by Bryan Lepore 21 Oct '14

21 Oct '14

Greetings - On the public webpage, there used to be an outstanding text tutorial under the phenix.refine link (I think!) that described the attachment of prosthetic groups and such to protein, I think using NAG (or was it something else...). It had all the commands for inclusion in the .def. and of course I can't find it now on the public site. Should I look in the local docs of an old release? -Bryan

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Phenix Table 1 discrepancy
by Rich Grey 20 Oct '14

20 Oct '14

I'm preparing Table 1 for a structure I have recently solved. I chose to compare the Table 1 Phenix produces to the data found in the PDB file and the log file from my last refinement in Phenix. I see discrepancies between the data for the highest resolution bin's R-factors, including what resolution data that bin contains. In addition, the number of reflections used in refinement is different (although only by about 5, so not a large difference). The PDB file appears to match the log file, and the overall Rwork and Rfree agree for all. Does anyone know where the Table 1 program in Phenix pulls these values from why I may be seeing these differences? Thank You. -Rich

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anomalous signal
by Matteo Colombo 20 Oct '14

20 Oct '14

Hello, I was wondering if the f'' determined by XANES experiment is quantitatively significant and if it can be contributed by two different anomalous scatterers. For example in my protein I know that Co and Zn are present. In theory, at Zn absorption edge, I have a contribution from Co too. If I perform a XANES experiment to determine Zn absorption edge and I obtain a f'' of 5.87, does this value correspond to only Zn signal or to a sum of Zn+Co? Thanks a lot Matteo -- Matteo Colombo PhD Groupe Extremophile et grands assemblages moléculaire Institut de Biologie Structurale 71 avenue des Martyrs CS 10090 38044 Grenoble Cedex 9

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phenix error
by Ivan IVANOV 17 Oct '14

17 Oct '14

Dear all, I have an error appearing in phenix. I think it is a problem of my pdb file. I do not know how to change it. Error: residue.id_str(suppress_segid=false):segid is not unique: pdbres=ATP C 1 "segid= "O" Does anyone can help me?? Where is the mistake and how to solve it ?? Kind regards, Ivan -- Ivan Ivanov, PhD PostDoctoral fellow at EMBL, European Molecular Biology Laboratory, Structural biology of RNA-protein complexes, Dr. Stephen Cusack, EMBL 71, avenue des Martyrs CS 90181 38042 Grenoble Cedex 9 T: +33 (0)4 76 20 7630 T(lab): +33 (0)4 76 20 7014 Email: ivanov(a)embl.fr Url: http://www.embl.fr

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