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Call for Abstracts: Michael G. Rossmann Memorial Symposium at the Microscopy & Microanalysis 2021
by Hasan, Syed Saif 20 Jan '21

20 Jan '21

Dear Colleagues, We cordially invite you to the “Michael G. Rossmann Memorial Symposium” at the Microscopy & Microanalysis 2021 conference, to be held in Pittsburgh, PA, Aug 1-5, 2021. This symposium focuses on the application of hybrid methods in electron microscopy of viruses, enzymes and other macromolecules, areas in which Michael was a pioneer. The symposium will feature invited talks from Prof. Hao Wu (Harvard Medical School), Prof. Rui Zhao (University of Colorado School of Medicine), and Prof. Chuan (River) Xiao (University of Texas El Paso). We invite abstracts from speakers in academics and industry at all career levels who develop and apply cutting-edge structural biology approaches to the study of viruses, viral proteins, enzymes, membrane proteins, and other systems. Ten abstracts will be selected for 15-minute oral presentations whereas the remaining abstracts will have the opportunity to be selected for poster presentations. Please note that the deadline for abstract submission is February 18, 2021. You will have the opportunity to select your preference for either in-person or virtual presentation. For additional meeting information and to register and submit your abstract, visit: https://www.microscopy.org/MandM/2021/ Deadline for abstract submission: February 18, 2021 We look forward to hosting you and learning about your exciting science at the M&M 2021 meeting. Sincerely, Terje Dokland (University of Alabama at Birmingham, Birmingham AL) S. Saif Hasan (University of Maryland School of Medicine, Baltimore MD)

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Retaining hydrogen in ligand while carrying out automatic ligand fitting.
by Rangarajan Erumbi 19 Jan '21

19 Jan '21

Hi, I am using phenix.ligandfit to automatically fit a ligand in to the ligand site of a protein model using the experimentally derived structure factors for the complex. The ligand pdb and restraints are created using phenix.elbow which contains the hydrogen atoms. However, after phenix.ligandfit the coordinates that are derived is stripped of all the ligand hydrogens. I want to retain the hydrogens only on the ligand during the refinement to preserve the overall geometry of the ligand. I am trying to do this automatically over several datasets with different ligands. I don’t see any specific parameter in the phenix.ligandfit that would specifically allow me to retain the ligand hydrogens. Phenix.reduce or phenix.ready_set does add hydrogens to entire coordinates including protein residues and so could not use it directly. Is there a way to get this accomplished in a simple way? Thanks in advance and appreciate your suggestions. Rangarajan.

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postdoc position, automated ligand placement
by Gabor Bunkoczi 17 Jan '21

17 Jan '21

Dear All, We have an opening for skilled post-doctoral researcher with an interest in software development at our Cambridge (UK) site. The aim of the project is to develop new methods for automated ligand fitting guided by experimental electron density/electrostatic potential maps, and will focus on locating, sharpening and classifying unmodelled regions of density, determining the identity of the binder using density shape and other physical properties derived from the surroundings, and subsequently fitting the molecule taking potential interactions with the environment into account. For more information about the position, please see the full advert: https://astx.com/wp-content/uploads/2021/01/SI-Post-Doc-2019-Mol-Sci-new-ad… Interested candidates should liaise with the HR department. For informal enquiries, please feel free to contact me directly. Best wishes, Gabor Bunkoczi Astex Therapeutics Ltd 436 Cambridge Science Park Cambridge CB4 0QA, UK This email and any attachments thereto may contain private, confidential, and privileged material for the sole use of the intended recipient. Any review, copying or distribution of this email (or any attachments thereto) by others is strictly prohibited. If you are not the intended recipient, please delete the original and any copies of this email and any attachments thereto and notify the sender immediately.

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PhD position available
by Tobias Beck 14 Jan '21

14 Jan '21

Dear all, We have an opening for a PhD position in my group. The Beck group is located at the University of Hamburg, with labs well-equipped for nano chemistry and protein chemistry. Moreover, state-of-the-art facilities for structural characterizations such as PETRA III are close by. The project will focus on the design and synthesis of novel biohybrid nanostructures based on proteins and anisotropic inorganic nanoparticles. The post is part of the interdisciplinary research consortium 'Nanohybrid' and is available starting on April 1st 2021. Full details of the post and the applications process are available here: https://www.uni-hamburg.de/uhh/stellenangebote/wissenschaftliches-personal/… Link to the group homepage: https://www.chemie.uni-hamburg.de/institute/pc/arbeitsgruppen/beck.html Link to the research consortium 'Nanohybrid' webpage: https://www.chemie.uni-hamburg.de/en/forschung/grk-nanohybrid/ Deadline for applications is Feb 15 2021. I'd appreciate it if you could pass this announcement on to potentially interested candidates. Please contact me for further information or informal inquiries: tobias.beck @chemie.uni-hamburg.de Best, Tobias. ____________________________________________________________ Prof. Dr. Tobias Beck University of Hamburg Department of Chemistry Institute of Physical Chemistry Grindelallee 117 D-20146 Hamburg Germany phone: +49 4042838 8210 fax: +49 4042838 3462 web: www.chemie.uni-hamburg.de/institute/pc/arbeitsgruppen/beck/ ____________________________________________________________

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Postdoc position, Plant Hormone Transporting Membrane Proteins (Denmark)
by Bjørn Panyella Pedersen 14 Jan '21

14 Jan '21

Dear colleagues, I have an open postdoc position funded by the ERC (details below). Please pass this along to anyone who might be interested. Thanks! /Bjørn Postdoctoral position in Structure of Plant Hormone Transporting Membrane Proteins at Aarhus University, Denmark. (https://tinyurl.com/MBGpostdoc) We are looking for a highly skilled and motivated postdoc with an interest in working on plant hormone transporting membrane transporters and preferably with a proven track record in the area of structural and/or functional analysis of membrane proteins and an interest for plant biology. Starting date is negotiable. Funding is available through an ERC grant for at least 2 years of employment. An extension is possible for up to a total maximum of 4 years of employment as a postdoc. The position: The position seeks to strengthen ongoing activities in the laboratory of Bjørn P. Pedersen on structure, related to the function and mechanism of plant hormone-transporting membrane proteins as defined by the ERC project MUM-GROW (pedersenlab.dk). Exact project will be shaped out in dialogue with top runners. The laboratory's interest is the interplay between structure and function of transmembrane transport processes with a focus on metabolite uptake systems, and the methods uses are primarily crystallography and cryo-EM. The group is part of the Section of Structural Biology at Aarhus University. The candidate: A successful candidate has a relevant Ph.D. degree and a solid and documented background in structural biology, biochemistry and/or biophysics. Experience with membrane protein expression and purification is favored, and the candidate must demonstrate an ability and interest to work with membrane proteins with a structural aim. Applicants should be ambitious, show strong collaborative skills, and be able to take initiatives and responsibility within the work environment. The successful candidate is offered: - access to a well-developed research infrastructure. - a research climate inviting lively, open and critical discussion within and across different fields of research. - a working environment with teamwork, close working relations, network activities among young scientists and social activities. - a workplace characterized by professionalism, equality and a healthy work-life balance. The city: In Aarhus you have easy access to beautiful nature, an exciting culture and city life as well as a safe environment for children - a great place for the whole family. The city of Aarhus has everything you need: exciting national and international jobs, delightful residential areas, a rich cultural life, and beautiful surrounding landscape of woods and coastline that make Aarhus a wonderful place to live and work. See https://international.au.dk/life/ for details. Aarhus University offers relocation service to international researchers. You can read more about it at https://international.au.dk/life/researcherscomingtoau/. Deadline: All applications must be made online (https://tinyurl.com/MBGpostdoc) and received by March 1st 2021.

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Phenix version 1.19 released
by Paul Adams 11 Jan '21

11 Jan '21

The Phenix developers are pleased to announce that version 1.19 of Phenix is now available (build 1.18.2-3874). Binary installers for Linux, Mac OSX, and Windows platforms, and the source installer, are available at the download site: http://phenix-online.org/download/ Please note that this recent publication should now be used to cite the use of Phenix: Macromolecular structure determination using X-rays, neutrons and electrons: recent developments in Phenix. Liebschner D, Afonine PV, Baker ML, Bunkóczi G, Chen VB, Croll TI, Hintze B, Hung LW, Jain S, McCoy AJ, Moriarty NW, Oeffner RD, Poon BK, Prisant MG, Read RJ, Richardson JS, Richardson DC, Sammito MD, Sobolev OV, Stockwell DH, Terwilliger TC, Urzhumtsev AG, Videau LL, Williams CJ, Adams PD: Acta Cryst. (2019). D75, 861-877. https://doi.org/10.1107/S2059798319011471 Highlights for the 1.19 version of Phenix: - phenix.real_space_refine: - Improved rotamer fitting (use multiprocessing, in case of NCS constraints work on one copy only and propagate changes to all related copies, various performance improvements and bug fixes) - Improved map/restraints weight calculation - Morphing can now use multiprocessing (nproc) - phenix.map_to_model and phenix.trace_and_build - Improved high-resolution model-building including detection of insertions and deletions - New methods - phenix.local_resolution: calculates a local resolution map - phenix.local_aniso_sharpen: optimizes a map taking into account local resolution-dependence and anisotropy of the map and its errors - New scripting tools - High-level scriptable Python tools are now available for map and model analyses and manipulation as well as for model-building - Restraints - Adjusting the "positions" of atom names in (pseudo-)symmetric amino acid side chains is now the default - Improved restraints for ARG allows more flexibility of the CD atom - Bug fixes - Chains with modified amino or nucleic acids can be aligned - Fixed handling of modified amino/nucleic acids in sequence alignment For a full list of changes see: http://www.phenix-online.org/documentation/CHANGES Please note that this new publication should be used to cite the use of Phenix: Macromolecular structure determination using X-rays, neutrons and electrons: recent developments in Phenix. Liebschner D, Afonine PV, Baker ML, Bunkóczi G, Chen VB, Croll TI, Hintze B, Hung LW, Jain S, McCoy AJ, Moriarty NW, Oeffner RD, Poon BK, Prisant MG, Read RJ, Richardson JS, Richardson DC, Sammito MD, Sobolev OV, Stockwell DH, Terwilliger TC, Urzhumtsev AG, Videau LL, Williams CJ, Adams PD: Acta Cryst. (2019). D75, 861-877. https://doi.org/10.1107/S2059798319011471 Full documentation is available here: http://www.phenix-online.org/documentation/ There is a Phenix bulletin board: http://www.phenix-online.org/mailman/listinfo/phenixbb/ Please consult the installer README file or online documentation for installation instructions. Direct questions and problem reports to the bulletin board or: help(a)phenix-online.org and bugs(a)phenix-online.org Commercial users interested in obtaining access to Phenix should visit the Phenix website for information about the Phenix Industrial Consortium. The development of Phenix is principally funded by the National Institute of General Medical Sciences (NIH) under grant P01-GM063210. We also acknowledge the generous support of the members of the Phenix Industrial Consortium. -- Paul Adams Division Director, Molecular Biophysics & Integrated Bioimaging, LBL (http://biosciences.lbl.gov/divisions/mbib) Principal Investigator, Computational Crystallography Initiative, LBL (http://cci.lbl.gov) Vice President for Technology, the Joint BioEnergy Institute (http://www.jbei.org) Principal Investigator, ALS-ENABLE, Advanced Light Source (http://als-enable.lbl.gov) Division Deputy for Biosciences, Advanced Light Source (https://als.lbl.gov) Laboratory Research Manager, ENIGMA Science Focus Area (http://enigma.lbl.gov) Adjunct Professor, Department of Bioengineering, U.C. Berkeley (http://bioeng.berkeley.edu) Adjunct Professor, Comparative Biochemistry, U.C. Berkeley (http://compbiochem.berkeley.edu) Building 33, Room 250 Building 978, Room 4126 Building 977, Room 180C Tel: 1-510-486-4225 http://cci.lbl.gov/paul Lawrence Berkeley Laboratory 1 Cyclotron Road BLDG 33R0345 Berkeley, CA 94720, USA. Executive Assistant: Ashley Dawn [ ashleydawn(a)lbl.gov ][ 1-510-486-5455 ] --

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Post-doc vacancy in cryoem of viruses
by Hasan, Syed Saif 11 Jan '21

11 Jan '21

Dear Colleagues, A vacancy for a post-doctoral researcher is available immediately in my lab in the University of Maryland Center for Biomolecular Therapeutics located on the campus of Institute for Bioscience and Biotechnology Research (IBBR; https://www.ibbr.umd.edu/profiles/s-saif-hasan<https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.ibbr.…>) in Rockville MD. We use high-resolution single particle cryoEM and X-ray crystallography to investigate how viruses utilize structural similarities with host proteins to hijack inter-organelle communication. Prior experience in insect cell culture for recombinant protein production is desirable. Expertise in cryoEM or X-ray crystallography will be advantageous. Candidates who have recently completed their PhD are encouraged to apply. IBBR is located 20 miles north-west of Washington DC. In IBBR, you will have in-house access to a 200 kV Talos Arctica with a Falcon 3EC DED and a 200 kV Glacios with a K3 DED and a Volta Phase Plate (VPP). We have a Vitrobot Mark IV and a Cp3 cryo-plunger for sample preparation. We have off-site access to a Titan Krios microscope equipped with DED and VPP. For X-ray crystallography, we have access to a Mosquito crystallization robot. Data collection is usually performed at synchrotrons. Our research is highly collaborative and is supported by wonderful colleagues who help us out with their expertise in NMR spectroscopy, lipidomics, HDX-MS, MD simulations, computer assisted drug design, and cellular imaging. Interested candidates should send their CV and a cover letter to me at sshasan(a)som.umaryland.edu ************************************************************************************************ The University of Maryland, Baltimore is an Equal Opportunity, Affirmative Action employer. Minorities, women, individuals with disabilities and protected veterans are encouraged to apply. ************************************************************************************************ Saif S. Saif Hasan, PhD Assistant Professor Department of Biochemistry and Molecular Biology, University of Maryland School of Medicine 108 N. Greene Street, Baltimore MD 21201 https://www.medschool.umaryland.edu/profiles/Hasan-S-Saif-Hasan-Syed-Saif/ Associate Member Program in Oncology, University of Maryland Marlene and Stewart Greenebaum Comprehensive Cancer Center (UMGCCC) 22 S. Greene Street, Baltimore MD 21201 Office and Laboratory Address: Center for Biomolecular Therapeutics, Institute for Bioscience and Biotechnology Research (IBBR) 9600 Gudelsky Drive, Rockville MD 20850 https://www.ibbr.umd.edu/profiles/s-saif-hasan Phone: 240-314-6396 Fax: 240-314-6225

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Senior Technician Position at the Biochemistry and Structural Biology Unit - IEO Milano
by Sebastiano Pasqualato 11 Jan '21

11 Jan '21

Dear all, a position is open at the Biochemistry and Structural Biology Unit of the European Institute of Oncology in Milan. The Unit (https://www.research.ieo.it/research-and-technology/technological-units/bio… <https://www.research.ieo.it/research-and-technology/technological-units/bio…>) is one of the technological platforms of the Department of Experimental Oncology of the European Institute of Oncology (www.research.ieo.it <http://www.ieo0researh.it/>), a comprehensive cancer centre located in the south area of Milan. We provide services and support to the department in the fields of Biochemistry and Structural Biology and collaborate both with scientific groups of the department and external ones to foster the structural biology aspects of their projects. The ideal candidate has a Master/PhD degree in Chemistry, Biotechnology or Biology, with strong interest in biochemistry and structural biology. We are looking for an enthusiastic, motivated person, with good organisational and relational skills, and a good knowledge of English. She/he will take care of assisting scientists collaborating with the Unit in macromolecular samples purification, characterisation and crystallisation, managing sample shipment to synchrotrons, supervising instrumentation usage and maintenance. The Unit is setting up a Cryo-EM lab with an in-house VitroBot blotting device and external Electron Microscopy access, which the candidate is expected to manage. Experience in setting up grids and Cryo-EM data collection will be a distinguishing skill. Potential applicants are encouraged to contact Dr. Sebastiano Pasqualato, sending a brief description of interests, and a CV with at least one referee contact to sebastiano.pasqualato(a)ieo.it <mailto:[email protected]>. Best regards, Sebastiano -- Sebastiano Pasqualato, PhD Biochemistry and Structural Biology 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: https://www.research.ieo.it/research-and-technology/technological-units/bio…

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Postdoc position available on membrane proteins at Aarhus University
by Joseph Lyons 11 Jan '21

11 Jan '21

Dear Colleagues, Please pass this along to anyone who might be interested. Thanks! Joe online posting: http://tiny.cc/y1y7tz We are looking for a highly skilled and motivated postdoc with an interest in working on structural studies of lipid transporting membrane transporters by cryo-EM. The applicant should preferably have a proven track record in the area of structural and/or functional analysis of membrane proteins. The position will be open from Spring 2021, but starting date is negotiable. Funding is available for at least 2 years of employment, with an extension possible for up to a total maximum of 3 years. The position: The position aims to strengthen ongoing activities in the newly established Lyons Lab at the Department of Molecular Biology and Genetics, Aarhus University, Denmark. The laboratory's interest is the interplay between structure and function of transmembrane transport processes with a focus on lipid transport systems. The lab houses facilities for mammalian protein production, purification, cellular, biochemical and biophysical characterization and data processing and has access to the state-of-the-art Cryo-EM facility based at iNANO (https://inano.au.dk/research/research-platforms/inano-cryo-em-facility/). The group is part of the Section of Structural Biology at Aarhus University. The project is within the framework of a highly prestigious and international collaborative research program ASAP (Aligning Science Across Parkinson’s), the team will explore the structure, function and regulation of the human glucosylceramide transporters (ATP10) (https://parkinsonsroadmap.org/research-network/biology-of-pd-associated-gen…). These molecular insights may pave the way for a drug discovery strategy for Parkinson’s disease. The candidate: A successful candidate has a relevant Ph.D. degree and a solid and documented background in structural biology, biochemistry and/or biophysics. Experience with membrane protein expression and purification and/or functional characterization is favored, and the candidate must demonstrate an ability and interest to work with membrane proteins with a structural aim. Applicants should be ambitious, show strong collaborative skills, and be able to take initiatives and responsibility within the work environment. The successful candidate is offered - a full-time appointment (100%) as a post doc for a period of 3 years with the possibility of an extension. The successful candidate is encouraged to initiate and participate in grant proposals to expand the research line and ensure continuation after the project end - Participation in a vibrant international research network ASAP with focus on collaboration and open science, offering excellent networking opportunities. - access to a well-developed research infrastructure. - a research climate inviting lively, open and critical discussion within and across different fields of research. - a working environment with teamwork, close working relations, network activities among young scientists and social activities. - a workplace characterized by professionalism, equality and a healthy work-life balance. The city: In Aarhus, you have easy access to beautiful nature, an exciting culture and city life as well as a safe environment for children - a great place for the whole family. The city of Aarhus has everything you need: exciting national and international jobs, delightful residential areas, a rich cultural life, and beautiful surrounding landscape of woods and coastline that make Aarhus a wonderful place to live and work. Deadline: All applications must be made online (http://tiny.cc/y1y7tz) and received by 7th Feb. 2021.

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About Restrain Files for ligands
by Sharan Karade 08 Jan '21

08 Jan '21

Hello all, I hope everybody is doing well. Happy New Year 2021!!! I am stuck with some unusual behavior of restrain files generated by Phenix.ReadySet. I crystallized the protein with ligands which have double bonds between the atoms. As I see clear electron density for the ligand, I drew a ligand molecule in Coot (Ligand builder) and fitted in electron density very nicely. Until here, I can see the double bonds in the modelled ligand. I generated the restrain files using Phenix.ReadySet to further proceed for refinement. Unfortunately, after refinement the double bonds were converted to single bonds. I tried to generate new restrain files and refined the model, resulting in similar output. But, fortunately in one case, the double bonds were retained after refinement also. I tried to repeat with other ligands, where I was unsuccessful to retain the double bonds. please help me. Thank you so much. Regards Sharan -- Sharan Karade Postdoc-fellow IBBR-UMD, 9600 Gudelsky Dr, Rockville Maryland 20850

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Modeling sugars with Coot and Phenix
by Emilia C. Arturo (Emily) 07 Jan '21

07 Jan '21

Hello All, I have several questions regarding sugar modeling. These are questions for both Coot (0.9.4-pre/CCPEM) and Phenix (1.18.2-3874) usage (on a Mac) for modeling as correctly as possible several N-linked glycosylation (i.e. not ligand) sugars within a protein, and about the approach as it pertains to higher resolution X-ray maps (better than 2A) or to lower resolution EM maps (~3-4A). I am new to the world of glycoproteins and cryoEM, not new to model building or X-ray crystallography, and would welcome any advice or insight. For relatively low resolution maps, where sugar moieties cannot be placed unambiguously, in theory (say Agirre (2017) and Emsley and Crispin (2018)) pyranose placement within the map should be quite highly restrained by ideal geometry for the specific sugar expected from prior knowledge. In practice, however, it’s not entirely clear how to maintain these restraints on pyranose geometry and conformation during manual building in Coot, or how to apply any special restraints in Phenix. The Glyco module of Coot does indeed place fine looking Asn-NAGs after a few iterations of manual placing and refining to account for the poor resolution of the acetyl group, just as discussed by Emsley and Crispin (2018). However, the validation report that is obtained from the OneDep system at the rcsb web server for the resulting structure shows many outliers in bonds and angles within the NAG or between the NAG and protein Asn residue. In Coot I have experimented with various restraints (in the R/RC menu), including decreasing the Refinement weight/weight matrix to zero, or some small non-zero number, thinking this places less weight on the map signal and more on the ideal values within Coot’s libraries. I have tried a variety of refinement restraint combinations in Coot to address individual bonds and angles outliers within the sugar, but the rcsb validation report still finds departures from ideal geometry. Meanwhile, in Phenix I don’t do anything specific for the refinement of glycosylation sugars (should I?) other than apply the appropriate restraints for any low resolution EM map; are there specific restraints files I ought to be using within Phenix real space refine jobs for N-linked sugars? Then I noticed that loads of existing PDB entries containing N-linked glycans contain similar outliers in pyranose geometry. So this prompted me to wonder whether we’re not doing things right, that in practice we’re not correctly following what’s advised in theory, or whether this is just the state of model building currently. Could someone more experienced than am I on sugar building please comment here on how exactly to get the sugars better built? e.g. what buttons to press and why, in Phenix and/or in Coot. Or is this a tolerable situation where sugar geometries differ from ideal even at low resolution? Is it perhaps a matter of different targets being used for PDB validation by the rcsb versus by Coot? It turns out that regarding higher resolution maps I am also unsure of exactly how to apply restraints within Coot. For example, using PDB ID 5VAA and its map with a reported resolution of 1.55A, I centered on Asn297 and its associated glycosylation sugars. I experimented with refinement strategies (i.e. the settings of R/RC), thinking that the best approach would be little restraint on ideal geometry and higher weight on the map signal. But no matter what combination of restraints I used, I was unable to keep the model locally from distorting; i.e. the deposited model versus map looks great, but within Coot I find a hundred ways to destroy it. I must be doing something wrong. Any advice or references you’d recommend would be greatly appreciated. Thanks. -- "Study as if you were going to live forever; live as if you were going to die tomorrow." - Maria Mitchell "I'm not afraid of storms for I'm learning to sail my ship." - Louisa May Alcott

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post-doc position at KU Leuven, ligand-gated ion channels
by Chris Ulens 05 Jan '21

05 Jan '21

A post-doctoral position is available at the Laboratory of Prof. Chris Ulens, KU Leuven, Belgium (http://www.xtal.be <http://www.xtal.be/>). The research in the Laboratory of Structural Neurobiology is aimed at understanding the molecular mechanism of ligand-gated ion channels. Our methods rely on X-ray crystallography and cryo-EM in combination with electrophysiological recordings and fluorescence-based techniques. Our laboratory hosts an integrated macromolecular crystallization facility with a Mosquito crystallization robot and two RockImagers. We have access to a 200 kV Glacios microscope on campus as well as 300 kV JEOL CryoARM300 at the nearby EM facility in Brussels. Current projects are situated at the crossroads of structural elucidation and drug discovery of different pentameric ligand-gated ion channels. We would like to recruit a post-doc with prior experience in cryo-EM or X-ray crystallography of membrane proteins. The successful candidate: - easily communicates in an open verbal manner and has a team player spirit - has an ambitious work ethic - critically contributes to writing of manuscripts and grant proposals - makes efforts to obtain independent funding - meets intermediate deadlines and brings projects to a successful end - fuels internal discussions of recent publications in the field - sets an example to younger PhD students in the lab - identifies directions for future scientific research The position is open immediately and applications will be accepted until the position is filled. Applicants are requested to submit a CV with publication list and two references. E-mail to chris.ulens(a)kuleuven.be <mailto:[email protected]> Selection of recent publications: A lipid site shapes the agonist response of a pentameric ligand-gated ion channel. Hénault CM, Govaerts C, Spurny R, Brams M, Estrada-Mondragon A, Lynch J, Bertrand D, Pardon E, Evans GL, Woods K, Elberson BW, Cuello LG, Brannigan G, Nury H, Steyaert J, Baenziger JE, Ulens C. Nat Chem Biol. 2019;15(12):1156-1164. doi: 10.1038/s41589-019-0369-4. Modulation of the Erwinia ligand-gated ion channel (ELIC) and the 5-HT3 receptor via a common vestibule site. Brams M, Govaerts C, Kambara K, Price KL, Spurny R, Gharpure A, Pardon E, Evans GL, Bertrand D, Lummis SC, Hibbs RE, Steyaert J, Ulens C. Elife. 2020;9:e51511. doi: 10.7554/eLife.51511. The structural basis for an on-off switch controlling Gβγ-mediated inhibition of TRPM3 channels. Behrendt M, Gruss F, Enzeroth R, Dembla S, Zhao S, Crassous PA, Mohr F, Nys M, Louros N, Gallardo R, Zorzini V, Wagner D, Economou A, Rousseau F, Schymkowitz J, Philipp SE, Rohacs T, Ulens C, Oberwinkler J. Proc Natl Acad Sci U S A. 2020;117(46):29090-29100. doi: 10.1073/pnas.2001177117.

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Bad geometry for DNA after Real-Space-Refine
by Jobichen Chacko 05 Jan '21

05 Jan '21

Dear BB, I am using phenix real space refinement for refining a cryo-EM model of protein-DNA complex. However after refinement the structure of the dna strands are twisted in a very bad geometry compared to the initial input model. I am using version 1.8 for this project, also tried couple of other versions as well, but the same problem happened. How to rectify this issue? Thank you. Jobi

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Variation in bonds after loading restraints
by Vatsal Purohit 02 Jan '21

02 Jan '21

Hello, I’ve been having issues with obtaining consistent number of bonds after generating .cif files using eLBOW. To generate the .cif file for an NADH molecule on eLBOW, I’ve been using a SMILE string generated using Chemdraw and a template .pdb file that was generated after using LigFit with a ligand .pdb model (also initially generated using a SMILE string). However, I find that when I load the restraints the bonds in the molecule only show correctly on the older version of coot (0.8.9.2). The double bonds on the adenine ring don’t appear in the latest version of coot (0.9.3) and the double bonds on the molecule don’t show up at all when I load the .cif file on REEL. Is there a reason why they could be inconsistent? Could I be viewing them incorrectly on REEL? Any thoughts on this would be appreciated! I’ve attached the SMILE string, template .pdb file and final .cif file in this email for your reference. Regards, Vatsal PhD Candidate, Stauffacher Lab, Dept. of Biology, Purdue University PULSe-Biophysics and Structural Biology training group vpurohi(a)purdue.edu<mailto:[email protected]> | 346-719-9409

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Calculating the transformation matrix of density map alignment
by Ahmad Khalifa 23 Dec '20

23 Dec '20

I have two density maps that I'm trying to align, or more precisely, calculate the transformation matrix (rotation and translation) of their alignment (moving one map and aligning it with the other map). Is there a way to accomplish that using phenix or any other tool? Thanks a lot and happy holidays.

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Post-doctoral vacancy in cryoEM of viruses
by Hasan, Syed Saif 22 Dec '20

22 Dec '20

Dear Colleagues, A vacancy for a post-doctoral researcher is available immediately in my lab in the University of Maryland Center for Biomolecular Therapeutics located on the campus of Institute for Bioscience and Biotechnology Research (IBBR; https://www.ibbr.umd.edu/profiles/s-saif-hasan) in Rockville MD. We use high-resolution single particle cryoEM and X-ray crystallography to investigate how viruses utilize structural similarities with host proteins to hijack inter-organelle communication. Prior experience in insect cell culture for recombinant protein production is desirable. Expertise in cryoEM or X-ray crystallography will be advantageous. Candidates who have recently completed their PhD are encouraged to apply. IBBR is located 20 miles north-west of Washington DC. In IBBR, you will have in-house access to a 200 kV Talos Arctica with a Falcon 3EC DED and a 200 kV Glacios with a K3 DED and a Volta Phase Plate (VPP). We have a Vitrobot Mark IV and a Cp3 cryo-plunger for sample preparation. We have off-site access to a Titan Krios microscope equipped with DED and VPP. For X-ray crystallography, we have access to a Mosquito crystallization robot. Data collection is usually performed at synchrotrons. Our research is highly collaborative and is supported by wonderful colleagues who help us out with their expertise in NMR spectroscopy, lipidomics, HDX-MS, MD simulations, computer assisted drug design, and cellular imaging. Interested candidates should send their CV and a cover letter to me at sshasan(a)som.umaryland.edu ************************************************************************************************ The University of Maryland, Baltimore is an Equal Opportunity, Affirmative Action employer. Minorities, women, individuals with disabilities and protected veterans are encouraged to apply. ************************************************************************************************ Saif S. Saif Hasan, PhD Assistant Professor Department of Biochemistry and Molecular Biology, University of Maryland School of Medicine 108 N. Greene Street, Baltimore MD 21201 https://www.medschool.umaryland.edu/profiles/Hasan-S-Saif-Hasan-Syed-Saif/ Associate Member Program in Oncology, University of Maryland Marlene and Stewart Greenebaum Comprehensive Cancer Center (UMGCCC) 22 S. Greene Street, Baltimore MD 21201 Office and Laboratory Address: Center for Biomolecular Therapeutics, Institute for Bioscience and Biotechnology Research (IBBR) 9600 Gudelsky Drive, Rockville MD 20850 https://www.ibbr.umd.edu/profiles/s-saif-hasan Phone: 240-314-6396 Fax: 240-314-6225

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Coot+Phenix issue
by Ashima Chopra 21 Dec '20

21 Dec '20

Hi all, I am running a refinement on Phenix for one structure, as I work on the Molprobity corrections from another refined structure in Coot. My Coot connects to Phenix so I can navigate through the Molprobity list easily, however the tmp.refine files from the first refinement keep popping up and replacing the current maps I have open. Is it possible to be connected to Phenix and define which project to display the maps/models from? Thanks, Ashima Ashima Chopra Graduate Assistant Eddy Arnold Laboratory Department of Chemistry and Chemical Biology/ Center for Advanced Biotechnology and Medicine Rutgers University, New Brunswick

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ASAPpdb - pledge to release data with preprints
by James Fraser 16 Dec '20

16 Dec '20

Fellow structural biologists - The revolution in publishing made possible by preprints calls for a re-evaluation of data disclosure practices in structural biology. While journal review processes take weeks, months, or even years, preprints allow researchers to rapidly communicate their findings to the community. However, withholding access to PDB files that accompany preprints inhibits the progress towards scientific discovery which preprints can enable. There is nothing more disappointing than reading a great preprint and not being able to open the coordinates and inspect the density! Sign the pledge to publicly release PDB files (and associated structure factor, restraint, and map files) with deposition of preprints here: https://asapbio.org/asappdb All the best, James PS> Apologies for the cross post to multiple bb's -- James Fraser - http://www.fraserlab.com - @fraser_lab jaimefraser(a)gmail.com // jfraser(a)fraserlab.com he/his/him (please do NOT use james.fraser(a)ucsf.edu)

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MicroED workshop 2020
by Johan Hattne 13 Dec '20

13 Dec '20

Dear all; We are pleased to announce the 6th MicroED workshop to be held on December 21, 2020. This will be a free virtual event. Please register at the following website to receive your link https://cryoem.ucla.edu/course Topics covered will include all aspects of microcrystal electron diffraction (MicroED) of diverse samples such as soluble proteins, membrane proteins, small molecules, natural products, and other materials. We will cover 1. Sample preparation methodologies 2. EPU-D for data collection 3. Camera systems and performance 4. FIB-milling procedures for soluble and membrane protein samples 5. Data analysis software, refinement, and structure solution The schedule is available on the registration page. // Sincerely; The organizing committee (Tamir Gonen, Brandon Mercado, Brent Nannenga)

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Submission Deadline on December 14th
by Tessa Van Grack 07 Dec '20

07 Dec '20

Hi PHENIX community, The AIMS Awards Fall 2020 application deadline is just one week away! For anyone with a protein target of interest, the AIMS Award program can help you discover new molecular tools, start new drug development programs, and get published. We encourage investigators, postdocs, and graduate students worldwide to apply. The AIMS Awards program provides non-profit researchers with virtual screening and compounds for physical testing at no cost. Collaborate with us to find novel active compounds for your protein target of interest. You can fill out the short application form directly on the website: atomwise.com/aims <https://hubs.la/H0z3sT80>. Please don't hesitate to reach out to me if you have any questions! Kind regards, Tessa *Tessa Van Grack, M.S.* Partnering Associate Atomwise <https://www.atomwise.com/> | Better Medicines Faster ᐧ -- Confidentiality Notice: The information contained herein is for informational purposes only. This message is private and the information contained in this message, including any attachments, contains information that may be confidential, privileged and/or proprietary. It is intended to be read only by the individual or entity to whom it is addressed. If you are not the intended recipient, please notify the sender by replying to this message, delete the material immediately from your system and note that you must not review, disclose, copy, distribute or take any action in reliance on or in reference to this message, including any attachments. No confidentiality, privilege, or property rights are waived or lost by any errors in transmission. Any unauthorized use or disclosure of the contents of this message is not permitted and may be unlawful.

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Re: [phenixbb] [ccp4bb] Phenix refine distorting a sidechain despite correct density
by Folmer Fredslund 03 Dec '20

03 Dec '20

Dear Igor There's a phenix bulletin board for question like this, which is where you should post the question. ( I crosspost here) I would choose to not do the real space refinement in phenix.refine during the last rounds of refinement of a model, when sidechain positions are essentially correct. I hope this helps Folmer tor. 3. dec. 2020 05.48 skrev Igor Petrik <petrik1(a)illinois.edu>: > I am refining a 1.71A X-ray structure with phenix refine. I have > everything modelled in - ~150 residues in the ASU and a heme - and my > R-work/R-free is 0.17/0.22. But when I went to deposit it, PDB pointed out > that two of my sidechains have distorted geometries. One is a His, and > looking at it in Coot, I can clearly see the 2Fo-Fc density for the correct > geometry, but the actual coordinates that phenix refine produce don't lie > in that density; there are significant difference map peaks showing that > the coordinates are in the wrong place. If I use real space refine in Coot > to put the coordinates back into the correct density and refine it again in > phenix, they get distorted again. > > What settings in phenix should I check to try to get it to properly refine > the coordinates? > > Thanks, > - Igor Petrik, PhD > > ------------------------------ > > To unsubscribe from the CCP4BB list, click the following link: > https://www.jiscmail.ac.uk/cgi-bin/WA-JISC.exe?SUBED1=CCP4BB&A=1 >

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Re: [phenixbb] 2x Postdoc positions and Lab Manager position
by Gordon Joyce 03 Dec '20

03 Dec '20

The Joyce Laboratory, Henry M. Jackson Foundation supporting the Emerging Infectious Diseases Branch, Walter Reed Army Institute of Research have openings for two postdoctoral positions and a Lab Manager position in Structural Biology of Emerging Infectious Diseases. One postdoctoral position involves the structural and biochemical characterization of small molecule inhibitors against Emerging Infectious pathogens including SARS-CoV-2, as part of an integrated drug development pipeline at WRAIR. One postdoctoral position involves the structural and biochemical characterization of viral glycoproteins from Emerging Infectious pathogens including SARS-CoV-2 to enable vaccine development, antibody therapeutics and small molecule inhibitors. The Lab manager position will oversee day-to-day activities in the lab including lab inventory, ordering and routine mammalian cell culture and transient transfection. These positions offer a unique opportunity to gain extensive structural biology experience focused on vaccine and therapeutic development for pandemic prevention. Interested candidates should apply at the sites indicated below, or with a cover letter and a current CV directly to Gordon Joyce gjoyce(a)eidresearch.org<mailto:[email protected]> Postdoctoral Fellow: https://recruiting.ultipro.com/HEN1006HMJ/JobBoard/3a6861f3-0883-4466-8b7d-… Postdoctoral Fellow: https://recruiting.ultipro.com/HEN1006HMJ/JobBoard/3a6861f3-0883-4466-8b7d-… Lab Manager: https://recruiting.ultipro.com/HEN1006HMJ/JobBoard/3a6861f3-0883-4466-8b7d-… M. Gordon Joyce, Ph.D. Chief, Structural Biology The Henry M. Jackson Foundation for the Advancement of Military Medicine, Inc. (HJF) In support of the Emerging Infectious Diseases Branch (EIDB) and the US Military HIV Research Program (MHRP) Walter Reed Army Institute of Research (WRAIR) 1N33, 503 Robert Grant Ave, Silver Spring, MD 20910 Office: 301-319-7528 Cell: 240-672-4311 https://eidresearch.org/our-team/m-gordon-joyce-phd gjoyce(a)eidresearch.org<mailto:[email protected]> ********************************************************************** This message contains information that may be confidential, privileged, proprietary, or otherwise protected. If you are not the intended recipient, notify the sender immediately and delete/destroy all copies of this message and any attachments. This message is not intended to constitute or include either an electronic record or an electronic signature unless otherwise specifically indicated.

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Power disruption (12/1 11 pm to 12/2 2 pm)
by Billy Poon 02 Dec '20

02 Dec '20

Hi everyone, Sorry for the short notice, but due to some electrical work in our building, several of the Berkeley servers will be shut down later tonight at 11 pm Pacific and will return tomorrow afternoon at 2 pm Pacific. This will affect: - The Phenix web site (http://phenix-online.org/) - The CCI web site (http://cci.lbl.gov/) - The Structural Biology Technology Portal (http://technology.sbkb.org/) Bug reports and emails requesting help should be queued and we will receive them once the servers are back online. We apologize for any inconvenience. -- Billy K. Poon Research Scientist, Molecular Biophysics and Integrated Bioimaging Lawrence Berkeley National Laboratory 1 Cyclotron Road, M/S 33R0345 Berkeley, CA 94720 Tel: (510) 486-5709 Fax: (510) 486-5909 Web: https://phenix-online.org

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alpha-Fold 2?
by lbetts0508 01 Dec '20

01 Dec '20

all - I just read the blurb in Nature Briefing about the DeepMind AI having made a big advance in the CASP protein fold prediction. Does it sound really transformational, does it work for membrane proteins - all the usual questions come to mind. Do we know enough yet about it? Signed an old protein crystallographer, L. Betts

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map_to_model input labels
by Schnicker, Nicholas J 20 Nov '20

20 Nov '20

Hi All, I'm trying to run map_to_model via command line for the first time (clearly) with an mtz file from an X-ray dataset. I have tried different iterations, but I can't seem to come up with the correct syntax for suppling the input labels. It gives me the list of available labels below, but what is the correct syntax to provide for input? Available labels: ['IMEAN,SIGIMEAN', 'I(+),SIGI(+),I(-),SIGI(-)', 'F,SIGF,DANO,SIGDANO,ISYM', 'F(+),SIGF(+),F(-),SIGF(-)', 'FreeR_flag'] Sorry I have checked the documentation, but still managed to fail. Thanks for your help, Nick

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