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Generation of residual electron density maps using IAS (inter atomic scatteres) model
by Ankur Kumar Singh 08 Aug '23

08 Aug '23

Dear Members, I am working on a protein structure resolved at 1.1 angstroms, and I am trying to generate a residual electron density map. I am following a series of articles from Prof. Afonine (Macromolecular refinement at subatomic resolution with interatomic scatterers<https://pubmed.ncbi.nlm.nih.gov/18007035/>). Here, an IAS modeling of the protein structure is done, followed by refinement in Phenix. The residual density is observed in conventional maps. I am trying to figure out how to create an IAS model for my protein structure. Please suggest any relevant method/article to obtain the model. And also, is it possible to have an IAS model for a protein resolved at 1.1 angstroms? Many thanks for considering my request. ----- Regards, Ankur K Singh Graduate Student

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General interest: Data matters session at the ACA 2023 in Baltimore
by John R Helliwell 05 Aug '23

05 Aug '23

Dear Colleagues, I have placed a note about this at the IUCr Committee on Data Public Forum: https://forums.iucr.org/viewtopic.php?f=39&t=457&sid=54ca94b6a4db968acc28ab… including a weblink to my slides at Zenodo. Best wishes, John Emeritus Professor John R Helliwell DSc

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[URGENT] Sorry: Fatal problems interpreting PDB file
by Esra A 02 Aug '23

02 Aug '23

Hello everyone, I am Esra Ayan. I would like to ask you about getting an error in Phenix: *Sorry: Fatal problems interpreting PDB file* *I followed the below command to resolve this issue:* 1. just running "phenix.ready_set MR.1.pdb" 2. then running "phenix.refine MR.1.updated.pdb MR.1.mtz MR.1.ligands.cif refinement.input.xray_data.r_free_flags.generate=True This way, i was able to solve the problem but still getting high Rwork and Rfree values. I still couldn't lower the values even though I tried many ways. What is your recommendation about this issue? i was wondering if I did a mistake by using Step 1 and Step 2 commands. You can find the reference pdb and mtz files in the attachment. Any help would be appreciated. Kind regards, Esra Ayan

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Postdoctoral position in drug discovery
by Harp, Joel M 02 Aug '23

02 Aug '23

Postdoctoral position in drug discovery An opening is available in the drug discovery laboratory of Dr. Stephen Fesik for a post-doc in the field of protein x-ray crystallography. Responsibilities will include protein production, fragment screening by NMR, and all aspects of x-ray crystallography including preparation of protein-ligand complexes, crystallization, home/synchrotron data collection, and structure determination. Additional experience in molecular biology including construct design, cloning, site-directed mutagenesis and modeling is a plus. The ideal candidate should be self-motivated and be able to communicate efficiently in a highly collaborative environment. Please send cv to jason.phan(a)Vanderbilt.Edu<mailto:[email protected]> The Vanderbilt campus is located in Nashville Tennessee. Also known as Music City, Nashville is a fast growing and dynamic environment with plenty of cultural attractions and opportunities for outdoor recreation.

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High Temperature Factors with TLS
by Thomas, Leonard M. 02 Aug '23

02 Aug '23

Hello All, A general questions though phenix.refine is being used for refinement. A student I am working with has a structure that was solved and initially refined using TLS and NCS parameters. They were given the structure to gain some experience in refinement and they have been asking me some questions, I was not involved in the initial work. While everything seems to be happy and the model is correct with good refinement statistics for the most part one thing that I am unsure of is some of the heavier atoms (Phosphate and Sulfer) have very high temperature factors when looking at individual residues or ligands. The temperature factors are at least twice as high as the lighter atoms they are associated with. I am at a loss to explain what is going on, I really have not used TLS refinement a lot so there is that. Resolution is about 2.5 angstroms with good completeness. Thoughts? Thank You in advance Len Thomas Leonard Thomas, Ph.D. Biomolecular Structure Core, Director Oklahoma COBRE in Structural Biology Price Family Foundation Institute of Structural Biology University of Oklahoma Department of Chemistry and Biochemistry 101 Stephenson Parkway Norman, OK 73019-5251 Office: (405)325-1126 lmthomas(a)ou.edu<mailto:[email protected]> http://www.ou.edu/structuralbiology/cobre-core-facilities/mcl

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Job Advert: Drug Discovery Project Research Scientist position, Francis Crick Institute, London, UK.
by David Briggs 01 Aug '23

01 Aug '23

Dear all, We have a position available at the Francis Crick Institute - please share with any soon-to-finish PhD students and postdocs who might be interested: We seek a talented, highly motivated and independent post-doctoral project research scientist to work on a project to design protein kinase C beta selective inhibitors for B cell malignancies. Work will be carried out in Neil McDonald's laboratory at the Francis Crick Institute, in collaboration with clinician-scientist Ingo Ringshausen at the University of Cambridge, and is funded by a Cancer Research Horizon Therapeutic Catalyst Award. The project will be funded for 18 months in the first instance, with the potential for extension depending on progress. The project will build upon prior work within our laboratory to characterise and develop new, selective kinase inhibitors. The work will involve both optimisation of existing inhibitors, and the parallel discovery of novel inhibitors using an XChem Fragment screening approach at Diamond Light Source. The Francis Crick Institute is situated in central London, and is the largest single-site biomedical research institute in Europe, with excellent provision for X-ray crystallography and medicinal chemistry to allow rapid characterisation and follow-up of any lead compounds. Prior experience with baculovirus protein expression and X-ray crystallography would be advantageous. Informal enquiries can be made to Professor Neil McDonald (neil.mcdonald(a)crick.ac.uk). Application Deadline: 1st Sept 2023. For more details about the role and the application process, please see: https://crick.wd3.myworkdayjobs.com/External/job/London/Postdoctoral-Projec… -- Dr David C. Briggs CSci MRSB (he/him) Principal Laboratory Research Scientist Signalling and Structural Biology Lab The Francis Crick Institute London, UK Working hours: Mon-Fri 0900-1700 == about.me/david_briggs<https://about.me/david_briggs> | OrcID<https://orcid.org/0000-0002-9793-7339> | Google Scholar <https://scholar.google.co.uk/citations?user=DRKG5KwAAAAJ> The Francis Crick Institute Limited is a registered charity in England and Wales no. 1140062 and a company registered in England and Wales no. 06885462, with its registered office at 1 Midland Road London NW1 1AT

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latest nightly build that runs on windows flawless
by Georg Mlynek 31 Jul '23

31 Jul '23

Hi community members, what is the latest latest nightly build that runs on windows flawless? I tried several versions after dev 4815 in the last year but all of them had different bugs. Most importantly the import of old projects should work. Many thanks, br Georg.

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General interest
by John R Helliwell 17 Jul '23

17 Jul '23

Dear Colleagues, I imagine that this book on the History of Scientific Journals: Publishing at The Royal Society 1665-2015, which I have reviewed in the current issue of J Appl Cryst will be of interest:- https://journals.iucr.org/j/issues/2023/04/00/xo0198/index.html My review is open access. The book itself is also open access:- https://www.jstor.org/stable/j.ctv2gz3zp1 Best wishes, John Emeritus Professor John R Helliwell DSc

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Phenix Phaser Question
by hyun4867 11 Jul '23

11 Jul '23

Dear, Everyone Hi all, I am Hyun Jeong. I want to ask you about phenix phaser problem. I obtain diffraction pattern of crystal that is complex. I tried to solve the phase based on the Apo structure i previoulsy solved. Using full-featured phaser, i obtain 18 Phaser solution. This is really strange number. But, the map obtained 18 Phaser solution is fitted in electron density map. May I proceed with processing using the discovered electron map with 18 Phasers? Is it necessary to redo the scaling? I appreciate your request for advice. Best regards, Hyun Jeong

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symmetry finding question
by Dmitry Semchonok 07 Jul '23

07 Jul '23

Dear colleagues, I have a chaperone map with D7 symmetry. But the Phenix «Map symmetry» tool finds only C7. Is there a way to make the software see the D7 symmetry of my protein? Many thanks for considering my request. Sincerely, Dmitry

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