- phenixbb - phenix-online.org

IUCr meeting in 2023
by Tom Peat 22 Nov '22

22 Nov '22

Hello All, Some of you may have noticed that the deadline for abstract submission for the IUCr meeting in Melbourne, Australia passed just recently. There are reasons for the early deadline, but please forgive us for that. There is an extension/ second call for abstracts which will be advertised in the near future. In the meantime, the portal is still open and you are welcomed and encouraged to continue to submit and register for this conference (where we hope to see many of you). This link should work to get you there: https://icmsaust.eventsair.com/iucr-2023/portal-2 Best regards, Tom

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Fully-funded PhD and two postdoc positions in structural bioinformatics
by Nicholas Pearce 22 Nov '22

22 Nov '22

Hi all, I am currently recruiting for 1 fully-funded PhD and 2 postdoc positions within my new research group at Linköping University in Sweden. Because this is an international board: the PhD position is a 4-year employed position with salary, healthcare coverage, pension, other employment benefits, etc. The starting salary for PhD researchers is 30 500 SEK/month (in 2022). The postdoc positions are initially for 2 years, and salaries for postdocs are negotiated on an individual basis. PhD Student in Structural Bioinformatics (Macromolecular Flexibility & Dynamics) I am looking for a PhD student to develop machine learning and data-science approaches to characterise heterogeneous/disordered regions of crystallographic structures from multi-dataset experiments (fragment screening/multi-temperature/time-resolved experiments), in order to study flexibility and dynamics of these systems. If you have a background in machine learning approaches, and are interested in applying these approaches to biological data, or a background in (computational) structural biology, and looking to further develop your data-science/programming skills, please get in touch! Read more and apply here: https://liu.se/en/work-at-liu/vacancies?rmpage=job&rmjob=20567&rmlang=UK Postdoctoral Researchers in Structural Bioinformatics (Macromolecular Flexibility & Dynamics) I am also looking for two postdoctoral researchers to 1) develop and deploy methods for quantifying and analysing flexibility in macromolecular structures using machine learning approaches, and 2) develop new modelling and refinement protocols for structures from multi-dataset experiments (fragment screening/multi-temperature/time-resolved experiments) that enable visualisation and quantitative analysis of weak features in multi-dataset macromolecular structural data. Once more, please don’t hesitate to get in touch if you have questions about the positions! Read more and apply here: Position 1: https://liu.se/en/work-at-liu/vacancies?rmpage=job&rmjob=20513&rmlang=UK Position 2: https://liu.se/en/work-at-liu/vacancies?rmpage=job&rmjob=20539&rmlang=UK About the research group In the Data-Driven Determination of Macromolecular Structures (d3ms) group at Linköping University, we develop data-driven methodologies for determining and analysing macromolecular structures, focussing on structural disorder and dynamics in the context of biomedical applications. One of our primary focuses is the development of multi-dataset and integrative approaches which take advantage of ever-increasing data-collection capacities in both crystallographic and cryoEM experiments. This subject area means we use a variety of statistical, data science & machine learning approaches. The group website can be found here: macromolecular.github.io<https://macromolecular.github.io/> We are based in the bioinformatics division within the department of Physics, Chemistry and Biology (IFM) at Linköping University. Our research group is part of the Data-Driven Life Sciences (DDLS) program and the SciLifeLab national network, providing access to national computational resources, expertise and training opportunities. The location of the Swedish national supercomputer centre on the Linköping university campus provides additional access to computational resources. The SciLifeLab and Wallenberg National Program for Data-Driven Life Science (DDLS) is a 12-year initiative funded with a total of 3,1 billion SEK (~300M€) from the Knut and Alice Wallenberg Foundation. The purpose of the program is to recruit and train the next-generation of data-driven life scientists and to create globally leading computational and data science capabilities in life science in Sweden. The program is coordinated by SciLifeLab, a nationwide research infrastructure and a hub for cross-disciplinary life sciences. The DDLS program promotes collaborative interdisciplinary work and engagement with industry, healthcare and other national and international partners, such as WASP, with the aim of bridging the life science and data science communities. Please feel free to forward this to anyone you think might be interested in the position, Thanks, Nick Nicholas (Nick) Pearce | Assistant Professor in Bioinformatics SciLifeLab Data-Driven Life Sciences (DDLS) Fellow Linköping University, Sweden nicholas.pearce(a)liu.se<mailto:[email protected]> | macromolecular.science<http://www.macromolecular.science/> or macromolecular.github.io<https://macromolecular.github.io/>

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Isolate Protofilament from helical reconstruction
by Christian Tüting 09 Nov '22

09 Nov '22

Dear PHENIX mailing list, I have a question regarding a helical reconstruction, done in cryoSPARC. Usually, I work with "normal" symmetric particles, and there I can simply run phenix.map_box to isolate the asymmetric unit. This is somehow not possible with a helical map. As we also don't have an atomic model yet, we cannot just crop it with map_box. In our helical reconstruction, we have helical twist (in degree) and the helical rise (in Å) and a additional point group symmetry. We would like to isolate a single protofilament for further model building. Is this in principle possible in PHENIX? Additionally, is there a way to rebuild the helical structure, analogous to apply_ncs? Thanks Christian

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Douse adding waters with overlapping residue number
by Adrián González López 02 Nov '22

02 Nov '22

Dear phenix developers, When I run phenix.douse it assigns the waters to the closest chain, but it also attributes them the residue number 0, 1, 2, 3, 4…. which overlaps with the protein residues. Is this a bug? My workaround is to run phenix.sort_hetatms right after and it renumbers them correctly. I am on phenix version 1.20.1-4487-000 Thanks! När du har kontakt med oss på Uppsala universitet med e-post så innebär det att vi behandlar dina personuppgifter. För att läsa mer om hur vi gör det kan du läsa här: http://www.uu.se/om-uu/dataskydd-personuppgifter/ E-mailing Uppsala University means that we will process your personal data. For more information on how this is performed, please read here: http://www.uu.se/en/about-uu/data-protection-policy

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Scientist in Protein Crystallography -- ZoBio Leiden
by Misba Ahmad 31 Oct '22

31 Oct '22

ZoBio (www.zobio.com) was founded in 2004 and is located in Leiden, Netherlands. We offer innovative research services in the field of small-molecule drug discovery to the pharmaceutical and biotech industries. Our international team of 40 people covers five fields of expertise: Protein Sciences, Assay Development and Screening, Structural Biology, Medicinal Chemistry, and Data and Information Sciences. We are looking to strengthen our Structural Biology team with an enthusiastic scientist with a track record in protein X-ray crystallography. The structural biology team plays a critical role in supporting our clients’ drug discovery programs by providing structural insights into protein-ligand complexes by both NMR spectroscopy and X-ray crystallography. Our crystallization laboratory is equipped with state-of-the-art liquid handlers and automated imagers, and we have regular access to the main European synchrotrons. The team is involved in many projects with challenging targets and engaged in exploring innovative workflows. It is fully expected that the successful candidate will become a permanent and integral member of the ZoBio team after an initial 12-month contract. A tailored remuneration package will be proposed in line with individual qualifications and experience. The position is immediately available; the evaluation and assessment of candidates will run until the position is filled. *TASKS & RESPONSIBILITIES* As a member of the Structural Biology group, you will work on site in the laboratory primarily to support crystallization and structure determination of protein-ligand complexes. You will work with minimal supervision but in a highly collaborative environment within the Structural Biology group and will effectively cooperate on a per-project basis with other research groups at ZoBio. Your role will require working simultaneously on multiple projects in a rapidly evolving environment. You will: Provide input to research projects: - Design and implement (co-) crystallization and soaking strategies utilizing automation and robotics - High-throughput and -quality structure elucidation and interpretation of biological macromolecules in complexes with small molecules of interest - Troubleshoot proactively various challenges relating to protein crystallization - Perform experiments with deadlines - Report project results in an accurate and concise manner, both verbally and written - Keep up to date with relevant literatures and developments in the field of protein crystallography Organize logistics, planning and quality control for research projects: - Contribute to the overall quality control process of data that is generated by the group members - Control the integrity of data imported in project databases - Develop innovative approaches to protein crystallization and/or structure determination, including evaluation of new technologies that support and improve the workflow - Share knowledge, observations, and insights within the group and ZoBio to improve quality and efficiency of project proceedings - Collaborate with clients, external CROs and suppliers *PROFILE & COMPETENCIES* The ideal candidate has a strong background in biochemistry, biophysics or structural biology and at least 4 years of hands-on experience in protein crystallization and structure determination using standard crystallization software (e.g., CCP4, Phenix). Hands-on experience with crystallization robots and understanding of molecular interactions in the context of ligand modelling is desirable; a willingness to learn is required. The multitude of ongoing projects in a rapidly changing environment demands a flexible, creative, and highly organized person with hands-on mentality and excellent communication skills. Required competencies include: - Problem analysis: ability to identify problems, recognize important information, make connections between data, and trace possible causes of problems - Creativity: ability to come up with original solutions, and think ‘out-of-the-box’ to design novel strategies - Work standards: setting high quality standards with respect to performance of experiments and data analysis, and act accordingly - Oral and written communication: ability to communicate in a clear, persuasive, and effective way to colleagues and clients about ideas, and to report project progress in an accurate and reproducible manner - Adaptability: ability to adjust one’s behavior, planning, and organization in response to frequent changes, delays, and unexpected events - Teamwork: ability to contribute actively to a joint result or solution, even when such teamwork concerns a matter which is not of immediate personal interest - Tenacity: ability to stay with a plan of action or point of view until the desired goal has been attained or is no longer reasonably attainable - Planning and organization: ability to plan and organize tasks and projects to meet the defined goals Please send your CV, motivation letter and names of potential referees to < hrm(a)zobio.com*>* with the subject: “Scientist in Protein Crystallography”.

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staff scientist position for an experienced protein crystallographer
by Mooers, Blaine H.M. (HSC) 28 Oct '22

28 Oct '22

The Laboratory of Biomolecular Structure and Function (LBSF) at the University of Oklahoma Health Sciences Center (OUHSC) seeks an experienced crystallographer to run the daily operations of the LBSF. The position is at the Staff Scientist level. The candidate will be responsible for working with PIs to advance their structural biology projects. These efforts will include routine technical operations, developing new protocols to overcome challenging problems, and training the staff of user labs in protein purification, crystallization, data collection, and structure determination. The ideal candidate for this position will have a PhD and ten years of experience in macromolecular crystallography, a strong work ethic, and the ability to independently carry out each step of the standard crystallographic study workflow: this a service position, not a training position. The candidate will not be expected to write grant applications to support their position. Pluses in a candidate's background include experience with instrument repair, eukaryotic protein expression, membrane protein purification and LCP crystallization, Cyro-EM, microED, SAXS, SANS, XAFS, NMR, or XFELS. The LBSF is part of a suite of core labs supported in part by the OUHSC Vice President of Research. The LBSF is also part of the Biomolecular Structure Core (BSC) for the Oklahoma Center of Biomedical Research Excellence in Structural Biology (OCSB), which is based on the main campus in Norman. The OCSB was awarded five more years of NIH funding in May 2022. The BSC has contributed to the awarding of 26 million dollars in grant funding and 36 publications in the past ten years. The OCSB has been the focal point of Oklahoma's structural biology community for nine years. The community includes 50 labs at three major research institutions. The BSC is a vital part of a new Center for Therapeutic Science. The center coordinates and fosters the drug development pipeline with the BSC playing a central role in structure-based drug design. The LBSF is working closely with Dr. Matt Hart (https://basicsciences.ouhsc.edu/bmb/Faculty/bio_details/hart-matthew-phd-1), Director of the newly established Center for High Throughput Screening. Most of the 12 major users of the LBSF have cancer-related projects. One project led to the 2021 publication of crystal structures of RET Kinase bound to two drug molecules recently approved by the FDA for the treatment of non-small cell lung cancer (https://pubmed.ncbi.nlm.nih.gov/33161056/). Most of the major users are members of the Stephenson Cancer Center, a National Cancer Institute-designated cancer center. The compensation level for this full-time position includes a generous benefits package. The position is based in Oklahoma City -- an affordable place to raise a family. To apply, please submit a cover letter, CV and contact information (name and email) for three references to Blaine Mooers, Director of the Laboratory of Biomolecular Structure and Function at OUHSC, at blaine-mooers at ouhsc.edu. Also apply for Job # 223015 – Staff Scientist Structural Biology at jobs.ou.edu. The position will remain open until filled. Application review will begin immediately. OUHSC is an equal opportunity employer and is committed to creating a diverse and inclusive environment for all employees. Best regards, Blaine Blaine Mooers, Ph.D. Associate Professor Department of Biochemistry and Molecular Biology, College of Medicine Director of the Laboratory of Biomolecular Structure and Function Academic Director, Biomolecular Structure Core, COBRE in Structural Biology Full Member, Cancer Biology Program, Stephenson Cancer Center University of Oklahoma Health Sciences Center Mailing Address: 975 NE 10th Street, BRC 466 Oklahoma City, OK 73104-5419 Office: 405-271-8300 Lab: 405-271-8312 Websites: Faculty page: https://basicsciences.ouhsc.edu/bmb/Faculty/bio_details/mooers-blaine-hm-phd BSC-OKC (LBSF): https://research.ouhsc.edu/Core-Facilities/Laboratory-of-Biomolecular-Struc… COBRE in Structural Biology: https://www.ou.edu/structuralbiology

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Bond angle outliers missing from the list
by Adrián González López 22 Oct '22

22 Oct '22

Hi! I performed a real space refinement on my EM map and my validation summary indicates that I have 17 bond angle outliers. However, when I check on the MolProbity tab, Geometry Restraints, it only shows me one of them (and it still says there are 17). Is this a bug or something else? You can see it on the screenshot below: [cid:BADACC33-3B23-4F5B-8847-E5C39FCB01F3] Thanks! /Adrian När du har kontakt med oss på Uppsala universitet med e-post så innebär det att vi behandlar dina personuppgifter. För att läsa mer om hur vi gör det kan du läsa här: http://www.uu.se/om-uu/dataskydd-personuppgifter/ E-mailing Uppsala University means that we will process your personal data. For more information on how this is performed, please read here: http://www.uu.se/en/about-uu/data-protection-policy

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geometry minimization with ligand present
by CPMAS Chen 21 Oct '22

21 Oct '22

Hi, All, I have a structure calculated with NMR restraints but it has quite some geometry violation, such as torsion angles, clashes etc. The structure has a small molecule ligand bound. Is it possible to add an CIF file for the ligand and use phenix.geometry_minimization to idealize/optimize the protein structure? I have tried the following and phenix reported an error for missing CIF file. phenix.geometry_minimization model.pdb pdb_intepretation.apply_cif_restraints.restraints_file_name=ligand.cif what would be the correct syntax to add ligand cif for this geometry_minimization? Or what would be the proper way to idealize/optimize a protein structure with ligands present? The structure optimization during NMR calculation is not good enough in my case. Thanks! Charles *************************************************** Charles Chen Research Instructor University of Pittsburgh School of Medicine Department of Anesthesiology ******************************************************

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Re: [phenixbb] 3rd CCP4/BGU Workshop on Data Collection and Structure Determination
by Anat Shahar 14 Oct '22

14 Oct '22

Dear all, We are very pleased to announce the 3rd CCP4/BGU Workshop on Data Collection and Structure Determination, which will take place at Ben-Gurion University of the Negev (BGU) in Beer-Sheva, Israel, between 26th February to 1st March, 2023. The workshop is limited to 25 participants, and everybody who is interested is welcome to apply. The workshop program will be suitable for last-year PhD students, as well as postdoctoral researchers and young scientists in their first years of research. The workshop will concentrate on practical aspects of data collection, structure solution, model building, refinement and validation. Modern methods, benefiting from structure prediction with AlphaFold-2, as well as more traditional approaches to Molecular Replacement and Experimental Phasing will be considered in detail. In addition, all participants will have an opportunity to carry out remote data collection at Diamond Light Source on their own samples. A team of leading structural biology software developers from around the world will present lectures and tutorials and will also be available to help participants with their own projects, such as processing own data and solving structures during hands-on sessions of the workshop. More information, including “how to apply”, registration form and tentative program, can be found at: https://lifewp.bgu.ac.il/wp/ccp4workshop/ The closing date for application is 20.12.2022. Best wishes, Anat Shahar & Eugene Krissinel

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Re: [phenixbb] 3rd CCP4/BGU Workshop on Data Collection and Structure Determination
by Anat Shahar 14 Oct '22

14 Oct '22

Dear all, We are very pleased to announce the 3rd CCP4/BGU Workshop on Data Collection and Structure Determination, which will take place at Ben-Gurion University of the Negev (BGU) in Beer-Sheva, Israel, between 26th February to 1st March, 2023. The workshop is limited to 25 participants, and everybody who is interested is welcome to apply. The workshop program will be suitable for last-year PhD students, as well as postdoctoral researchers and young scientists in their first years of research. The workshop will concentrate on practical aspects of data collection, structure solution, model building, refinement and validation. Modern methods, benefiting from structure prediction with AlphaFold-2, as well as more traditional approaches to Molecular Replacement and Experimental Phasing will be considered in detail. In addition, all participants will have an opportunity to carry out remote data collection at Diamond Light Source on their own samples. A team of leading structural biology software developers from around the world will present lectures and tutorials and will also be available to help participants with their own projects, such as processing own data and solving structures during hands-on sessions of the workshop. More information, including “how to apply”, registration form and tentative program, can be found at: https://lifewp.bgu.ac.il/wp/ccp4workshop/ The closing date for application is 20.12.2022. Best wishes, Anat Shahar & Eugene Krissinel

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3rd CCP4/BGU Workshop on Data Collection and Structure Determination
by Anat Shahar 14 Oct '22

14 Oct '22

Dear all, We are very pleased to announce the 3rd CCP4/BGU Workshop on Data Collection and Structure Determination, which will take place at Ben-Gurion University of the Negev (BGU) in Beer-Sheva, Israel, between 26th February to 1st March, 2023. The workshop is limited to 25 participants, and everybody who is interested is welcome to apply. The workshop program will be suitable for last-year PhD students, as well as postdoctoral researchers and young scientists in their first years of research. The workshop will concentrate on practical aspects of data collection, structure solution, model building, refinement and validation. Modern methods, benefiting from structure prediction with AlphaFold-2, as well as more traditional approaches to Molecular Replacement and Experimental Phasing will be considered in detail. In addition, all participants will have an opportunity to carry out remote data collection at Diamond Light Source on their own samples. A team of leading structural biology software developers from around the world will present lectures and tutorials and will also be available to help participants with their own projects, such as processing own data and solving structures during hands-on sessions of the workshop. More information, including “how to apply”, registration form and tentative program, can be found at: https://lifeserv.bgu.ac.il/wp/ccp4workshop/ The closing date for application is 20.12.2023. Best wishes, Anat Shahar & Eugene Krissinel

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X-ray crystallography software developer position at Astex
by Gabor Bunkoczi 09 Oct '22

09 Oct '22

Dear All, We have an opening for a skilled software developer with crystallographic computing background at our Cambridge (UK) site. For more information about the position, please see the full advert: https://www.cloudonlinerecruitment.co.uk/Astex/VacancyDetails.aspx?FromSear… To apply, please follow the link in the advert. For informal enquiries, please feel free to contact me. 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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2022 MicroED Workshop
by Brent Nannenga 07 Oct '22

07 Oct '22

Dear all, We are pleased to announce the 7th MicroED workshop to be held the evening of December 11th to the 14th, 2022, and will be open to both academia and industry. This workshop will be held at the MicroED Imaging Center at UCLA and will contain both lectures and hands on demonstrations and training. For more information, tentative schedule, and to apply please see the following website: https://cryoem.ucla.edu/course-2022 Space is limited and historically, the workshop is typically oversubscribed, therefore we encourage applications to be sent in early. 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 * Sample preparation methodologies for proteins and small molecules * MicroED data collection * Camera performance * Cryo-FIB-milling procedures for MicroED * Data analysis software, structure solution, and refinement The schedule is available on the registration page. // Sincerely; on behalf of the organizing committee (Tamir Gonen, Brent Nannenga)

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Postdoctoral position in drug discovery
by Harp, Joel M 06 Oct '22

06 Oct '22

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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Drug Discovery Scientist opening Vanderbilt University
by Harp, Joel M 06 Oct '22

06 Oct '22

Drug Discovery Scientist Position An opening is available in the drug discovery laboratory of Dr. Stephen Fesik for a candidate with experience in the field of protein x-ray crystallography or NMR. 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 but not required. 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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Phenix secondary structure restraints bug
by Edwin Pozharski 03 Oct '22

03 Oct '22

When using phenix.secondary_structure_restraints (from command line, not sure if it's different in GUI) ss_by_chain flag is ignored when using default method (ksdssp, even if explicitly selected). Works fine when mmtbx_dssp is used though. Details: > phenix.secondary_structure_restraints model.pdb format=pdb ss_by_chain=False only produces intrachain beta sheets. > phenix.secondary_structure_restraints model.pdb format=pdb ss_by_chain=False search_method=mmtbx_dssp produces both intrachain and interchain beta-sheets. I am fairly certain this is not KSDSSP bug per se, since output of $PHENIX/build/ksdssp/exe/ksdssp model.pdb contains interchain beta-sheets. This is with 1.20.1-4487.

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SSRL/LCLS User Meeting Registration is Open
by Mooers, Blaine H.M. (HSC) 29 Sep '22

29 Sep '22

Dear phenixbb: The SSRL/LCLS User's Meeting will be September 26-30, 2022. It will be virtual again due to COVID, but the of the sessions will be recorded live. Registration<https://urldefense.com/v3/__https://events.bizzabo.com/SLAC-UsersMeeting-20…> is free and open to all. We had about 1600 registrants last year. We will have 27 workshops, 3 poster sessions, and 3 plenary sessions. Distinguished plenary speakers include Drs. John Helliwell and Linda Young. Although the registered attendees will be able to view the videos at a later time, please do attend during the live sessions to participate in the question and answer periods. There will be several poster prizes. The BioXFEL prizes are not limited to work done at LCLS. The deadline<https://urldefense.com/v3/__https://events.bizzabo.com/SLAC-UsersMeeting-20…> for the submission of poster abstracts is September 9th. Best regards, Blaine Mooers on behalf of the SSRL/LCLS User's Meeting Organizing Committee and the SSRL User Executive Committee<https://urldefense.com/v3/__https://www-ssrl.slac.stanford.edu/content/abou…> and the LCLS User Executive Committee<https://urldefense.com/v3/__https://lcls.slac.stanford.edu/lcls-users-organ…>

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Alternative to AlphaFold2?
by Chip Lesburg 22 Sep '22

22 Sep '22

Hi PHENIX users, At this past summer's Diffraction Methods GRC meeting<https://www.grc.org/diffraction-methods-in-structural-biology-conference/20…>, Tom Terwilliger presented the utility of incorporating AlphaFold2 predictions during structure fitting and rebuilding. I wonder if anyone has experience using that or an alternative such as OmegaFold<https://www.biorxiv.org/content/10.1101/2022.07.21.500999v1> or OpenFold<https://github.com/aqlaboratory/openfold>? Are any of these easier or harder to get set up? Chip [cid:153156_edd5022b-de61-48a6-bf68-1a41de35ba89.png] Charles Lesburg Vice President, Structural Biology M 908-265-2064 301 Binney Street, Cambridge, MA 02142 odysseytx.com This message is for the named person's use only. It may contain confidential, proprietary or legally privileged information. If you receive this message in error, please immediately delete it and all copies of it from your system, destroy any hard copies of it and notify the sender. ODYSSEY THERAPEUTICS, INC. ("ODYSSEY THERAPEUTICS") reserves the right to monitor all e-mail communications through its networks. ODYSSEY THERAPEUTICS cannot be committed by this e-mail or warrant the accuracy or validity of any information presented. Any views expressed in this message are those of the individual sender.

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Question about occupancy and 2Fo-Fc and Fo-Fc maps
by Vatsal Purohit 19 Sep '22

19 Sep '22

Hi everyone, I had 2 questions regarding occupancy and maps generated in ligand-bound regions for various ligand models potentially present in the structure: 1. I’ve been working with some 2.0 angstrom structures and trying out refinements with 2 sets of bound ligands at varying occupancies (at the same active site) to get an approximate idea of their relative populations in the structure. For one set of ligands, I observe 2Fo-Fc density in regions uniquely occupied by them even when their occupancy is zero. Could there be a reason why this is the case? 2. Additionally, I observe red Fo-Fc density in the same region when the occupancy is set to 1.0. It disappears at lower occupancies of 0.7 indicating that a lower population of this ligand is present. However, when the occupancy is very low, we don’t see an equivalent green Fo-Fc density popping up in the same region. Could there be a reason for why the red Fo-Fc density at high occupancy doesn’t translate to green Fo-Fc for the same region at low occupancy? Any information or resources that could give me more insight into this question would be really helpful! Regards, Vatsal

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General interest article
by John R Helliwell 09 Sep '22

09 Sep '22

Dear Colleagues, I imagine you will find the article “The 4Rs and crystal structure analysis: reliability, reproducibility, replicability and reusability” of interest. The weblink is https://journals.iucr.org/j/issues/2022/05/00/dv5002/index.html The article is open access. It is a Teaching and Education article in J Appl Cryst. Best wishes, John Emeritus Professor John R Helliwell DSc

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Runtime error : Bond distance
by Luca Pellegrini 06 Sep '22

06 Sep '22

Phenix real space refine (dev 4704) crashes with: RuntimeError : Bond distance > max_reasonable_bond_distance: 67.4676 > 50: I’ve found various reports of this error in the bb but no (to me) clear solution, only one suggestion to increase the max_reasonable_bond_distance (Nov 2017). I tried setting excessive_bond_distance_limit (I guess is the same) to 999 but with no success as Phenix stops with the same error. Any help on how to fix this gratefully received. Best wishes, Luca

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Reference model restraints
by Luca Pellegrini 01 Sep '22

01 Sep '22

Hello, Phenix.real_space_refine keeps pushing a residue out of density so I'd like to restrain it to its current position. Can you please let me know how to implement in the GUI the first example at point 14 at https://phenix-online.org/documentation/reference/real_space_refine.html#us… phenix.real_space_refine model.pdb map.mtz \ reference_coordinate_restraints.enabled=true \ reference_coordinate_restraints.selection="chain A and resseq 12:21" \ reference_coordinate_restraints.sigma=0.05 Best wishes, Luca Luca Pellegrini, PhD Department of Biochemistry University of Cambridge Cambridge CB2 1GA UK

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Phenix website downtime
by Billy Poon 31 Aug '22

31 Aug '22

Hi everyone, There was some networking issue which caused the Phenix website to be down for several hours. The site should be back to normal, but please let us know if you have any issues. Thanks! -- Billy K. Poon Research Scientist, Molecular Biophysics and Integrated Bioimaging Lawrence Berkeley National Laboratory 1 Cyclotron Road, M/S 33R0345 Berkeley, CA 94720 Fax: (510) 486-5909 Web: https://phenix-online.org

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RNA structural biology position (Scientist-Sr.Scientist) at Arrakis Therapeutics
by Elena Menichelli 25 Aug '22

25 Aug '22

Dear all, We have an open position for an RNA structural biologist at Arrakis Therapeutics (Boston, MA area). The ideal candidate will have a background in structural characterization of RNA (X-ray crystallography, cryo-EM or atomic force microscopy) and a passion for developing small molecules that target RNA in a very collaborative environment. Please feel free to visit Arrakis’ website for a more detailed job description and to reach out to me for additional information and informal discussion. https://arrakistx.com/careers/current-openings/ With best regards, Elena ******* Elena Menichelli, PhD | Head of Structural Biology emenichelli(a)arrakistx.com<mailto:[email protected]> | www.arrakistx.com<http://www.arrakistx.com/>

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Launch of IUCrData Raw Data Letters: Editorial
by John R Helliwell 24 Aug '22

24 Aug '22

Dear Colleagues, I imagine you will be interested to know of the launch of IUCrData’s Raw Data Letters. The Main Editor is Dr Loes Kroon Batenburg. See https://forums.iucr.org/viewtopic.php?f=39&t=449&p=729#p729 Greetings, John Emeritus Professor John R Helliwell DSc Chair of IUCr CommDat

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