- phenixbb - phenix-online.org

map-to-model FSC on low resolution map
by bluufive2＠gmail.com 25 May '25

25 May '25

Hello, As part of a reviewer request for our manuscript, we are attempting to generate map-to-model FSCs for two low-resolution cryo-EM reconstructions—one at 10 Å and the other at 20 Å. We’re encountering an issue when using mtriage(both standalone and as part of the comprehensive cryo-EM validation pipeline), where the map-to-model FSC values are reported as “None”. For the 10 Å map, we were able to obtain a valid halfman-halfmap AND map-model FSC by supplying the two half-maps rather than the final unfiltered reconstruction. However, this approach has not worked for the 20 Å map, and we are still unable to retrieve a map-to-model FSC. I initially suspected the issue might be related to masking, but it appears that mtriage does not support the use of a user-provided mask. If you have any insight into what might be causing this or suggestions for alternative approaches, we would greatly appreciate your input. thanks best Jesse Hansen

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Excluding atoms from real-space refinement
by elwood.mullins＠vanderbilt.edu 14 May '25

14 May '25

Is it possible to exclude atoms in real-space refinement? Older posts seem to indicate this is, or at least was, only possible in reciprocal-space refinement. Has that changed? Using reference restraints as an alternative is less than optimal. Any help would be greatly appreciated.

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Integrative Structural Biology Summer School Padua Italy 7-11 July 2025
by Roberto Steiner 13 May '25

13 May '25

Dear All We are now at capacity for the Integrative Structural Biology Summer School www.school2025.cristallografia.org<http://www.school2025.cristallografia.org> that will be held in Padua, Italy 7-11 July 2025 However, given the interest we have decided to re-open the registration form as we have been able to secure a slightly larger room for lectures and tutorial. Registration will close this Friday at 5pm CET. With best wishes Roberto (on behalf of the organising committee) Roberto A Steiner www.steinerlab.org<http://www.steinerlab.org> https://twitter.com/steiner_lab roberto.steiner(a)kcl.ac.uk<mailto:[email protected]> Randall Centre for Cell and Molecular Biophysics Faculty of Life Sciences and Medicine King's College London Room 3.10A New Hunt's House, Guy's Campus SE1 1UL, London, UK Phone 0044 20 78488216 Fax 0044 20 78486435 roberto.steiner(a)unipd.it<mailto:[email protected]> Dipartimento di Scienze Biomediche Università degli Studi di Padova Viale G. Colombo 3 35131 Padova, Italia Telefono 0039 049 8276409 Responses to emails are not expected outside of your normal working hours.

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POSITION AVAILABLE: Visiting Research Specialist Position at the University of Illinois at Chicago
by Yury Polikanov 03 May '25

03 May '25

*Visiting Research Specialist Position Available in the Polikanov Lab <https://sites.google.com/view/polikanovlab>Department of Biological Sciences, University of Illinois at Chicago* *The Polikanov Laboratory <https://sites.google.com/view/polikanovlab> in the Department of Biological Sciences at the University of Illinois at Chicago is looking for a talented, skillful, and highly motivated researcher to fill the Visiting Research Scientist position to study the structure and function of the bacterial ribosome.* For full consideration, please submit your application along with a Cover Letter, CV, and three references by May 31, 2025. Cover letter should describe previous research accomplishments and scientific interests as well as how these fit within the scope of the research in the Polikanov lab. Questions can be addressed to Yury Polikanov at yuryp(a)uic.edu. Visiting Research Specialist- UIC Department of Biological Sciences, Polikanov Lab Hiring Department: Biological Sciences Location: Chicago, IL USA Requisition ID: 1033622 Posting Close Date: 05/31/2025 Link to Apply: https://uic.csod.com/ux/ats/careersite/1/home/requisition/14681?c=uic *Position Summary:* The Polikanov Lab is seeking a Visiting Research Specialist. Successful candidate will conduct research by using X-ray crystallography and cryo-EM techniques to obtain a structural basis for various functions of the bacterial ribosome and its inhibition by different small-molecule inhibitors. The successful candidate should have a strong theoretical background in standard biochemical, molecular biology, and biophysical methods, as well as practical skills in the most standard methods currently used in molecular biology and biochemistry (such as protein expression, purification, etc.). Knowledge in X-ray crystallography or other structural techniques is desired but not required. The successful candidate would conduct research and assist with training laboratory personnel in various techniques, experiments, and the appropriate use of research equipment. He/She would also perform data analysis and manage, document, and help with the dissemination of research activities for publication and outreach. *Duties & Responsibilities:* - Record keeping: log and track inventory of chemicals, reagents, and lab supplies - Maintain accurate records of experiments, procedures, and results - Keep the laboratory clean, organized, and free of contaminants - Glassware & Equipment Maintenance - Prepare culture media, buffers, and reagents according to protocols - Assist other researchers in the lab in conducting experiments - Purify bacterial ribosomes and all additional components necessary for the experiments, such as recombinant proteins, tRNAs - Train undergraduate and graduate students in research methods, use of equipment, record keeping, and laboratory database entry *Minimum Qualifications :* - Bachelor’s degree in biology, chemistry, biochemistry, biophysics, or related field required. Master’s degree in science preferred. - A minimum of 3 years of related research experience. - Strong background in biochemistry and molecular biology - Practical skills with the most standard methods currently used in molecular biology, and biochemistry (such as protein expression, purification) *Salary:* The budgeted salary range for the position is $48,000 to $60,000. The pay offered to the selected candidate will be determined based on factors including (but not limited to) the experience and qualifications of the selected candidate, including equivalent years in rank, training, and field or discipline; internal equity; and external market pay for comparable jobs. *About the University of Illinois Chicago* UIC is among the nation’s preeminent urban public research universities, a Carnegie RU/VH research institution, and the largest university in Chicago. UIC serves over 34,000 students, comprising one of the most diverse student bodies in the nation and is designated as a Minority Serving Institution (MSI), an Asian American and Native American Pacific Islander Serving Institution (AANAPSI) and a Hispanic Serving Institution (HSI). Through its 16 colleges, UIC produces nationally and internationally recognized multidisciplinary academic programs in concert with civic, corporate and community partners worldwide, including a full complement of health sciences colleges. By emphasizing cutting-edge and transformational research along with a commitment to the success of all students, UIC embodies the dynamic, vibrant and engaged urban university. Recent “Best Colleges” rankings published by U.S. News & World Report, found UIC climbed up in its rankings among top public schools in the nation and among all national universities. UIC has over 300,000 alumni, and is one of the largest employers in the city of Chicago. Benefits eligible positions include a comprehensive benefits package which offers: Health, Dental, Vision, Life, Disability & AD&D insurance; a defined benefit pension plan; paid leaves such as Vacation, Holiday and Sick; tuition waivers for employees and dependents. Click for a complete list of *Employee Benefits <https://www.hr.uillinois.edu/benefits/>*. *Final authorization of the position is subject to availability of funding.* *UIC is an EOE including Disability/Vets.* *The University of Illinois may conduct background checks on all job candidates upon acceptance of a contingent offer. Background checks will be performed in compliance with the Fair Credit Reporting Act* *The University of Illinois System requires candidates selected for hire to disclose any documented finding of sexual misconduct or sexual harassment and to authorize inquiries to current and former employers regarding findings of sexual misconduct or sexual harassment. For more information, visit **https://www.hr.uillinois.edu/cms/One.aspx?portalId=4292&pageId=1411899 <https://www.hr.uillinois.edu/cms/One.aspx?portalId=4292&pageId=1411899>*

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Deadline approaching: Integrative Structural Biology Summer School Padua Italy 7-11 July 2025
by Roberto Steiner 28 Apr '25

28 Apr '25

Dear All, Deadline is approaching for the International Summer School on “Current and Future Integrative Structural Biology”, taking place in the beautiful city of Padua, Italy, from 7–11 July 2025. Do not forget to register at the following link www.school2025.cristallografia.org<http://www.school2025.cristallografia.org/> This school will have a strong focus on cryo-EM, along with discussions on other cutting-edge techniques essential for modern structural biology research. Expert international speakers and tutors will provide valuable insights through lectures and practical sessions. With best wishes, Roberto (on behalf of the organising committee) Roberto A Steiner www.steinerlab.org<http://www.steinerlab.org> https://twitter.com/steiner_lab roberto.steiner(a)kcl.ac.uk<mailto:[email protected]> Randall Centre for Cell and Molecular Biophysics Faculty of Life Sciences and Medicine King's College London Room 3.10A New Hunt's House, Guy's Campus SE1 1UL, London, UK Phone 0044 20 78488216 Fax 0044 20 78486435 roberto.steiner(a)unipd.it<mailto:[email protected]> Dipartimento di Scienze Biomediche Università degli Studi di Padova Viale G. Colombo 3 35131 Padova, Italia Telefono 0039 049 8276409 Responses to emails are not expected outside of your normal working hours.

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Phenix Dock & Rebuild Python Error
by Nicholas Clark 22 Apr '25

22 Apr '25

Hi all, I'm trying to run Phenix Dock & Rebuild on a Mac (Venture 13.6.7) but I keep getting a NameError in Python that "DESKTOP_TYPE" is not defined. Does anyone have a quick way to fix this? Can I edit the code directly in that line to explicitly state that I'm on a mac or is this a variable that should be set directly in the base Python installation? Below is the entirety of the error message: NameError : global name 'DESKTOP_TYPE' is not defined Traceback (most recent call last): File "/Applications/phenix-1.20.1-4487/modules/phenix/wxGUI2/Runtime.py", line 224, in OnComplete self.handle_complete_event(event) File "/Applications/phenix-1.20.1-4487/modules/phenix/wxGUI2/Templates.py", line 491, in handle_complete_event self.add_result_panel(result) File "/Applications/phenix-1.20.1-4487/modules/phenix/wxGUI2/Templates.py", line 512, in add_result_panel params=self.params) File "/Applications/phenix-1.20.1-4487/modules/phenix/wxGUI2/Templates.py", line 980, in __init__ JobOutputPanel.__init__(self, parent) File "/Applications/phenix-1.20.1-4487/modules/phenix/wxGUI2/Windows.py", line 551, in __init__ WidgetArea.__init__(self, parent) File "/Applications/phenix-1.20.1-4487/modules/phenix/wxGUI2/Windows.py", line 512, in __init__ self.DisplayWidgets() File "/Applications/phenix-1.20.1-4487/modules/phenix/wxGUI2/Programs/DockAndRebuild.py", line 112, in DisplayWidgets if (DESKTOP_TYPE in ['mac', 'kde', 'gnome']): NameError: global name 'DESKTOP_TYPE' is not defined Thanks! Best regards, Nick Clark

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Research Specialist Position at the University of Illinois to Study Ribosome Structure | POLIKANOV Lab
by Yury Polikanov 21 Apr '25

21 Apr '25

*Research Specialist Position Available, Department of Biological Sciences, University of Illinois at Chicago - Polikanov Lab* *The Polikanov Laboratory in the Department of Biological Sciences at the University of Illinois at Chicago (IL, USA) is looking for a talented, skillful, and highly motivated researcher to fill the Research Specialist position to study the structure and function of the bacterial ribosome.* For fullest consideration, please submit an application and cover letter describing your scientific interests and how your previous research accomplishments and scientific interests fit with the scope of the research in the Polikanov research group at https://uic.csod.com/ux/ats/careersite/1/home/requisition/7573?c=uic *Position Summary:* The research in the Polikanov Laboratory at UIC is focused on understanding the basic principles of protein synthesis in bacteria, the modes of action of ribosome-targeting antibiotics, and the mechanisms of drug resistance at a structural level. This position is involved in the determination of high-resolution structures of ribosome functional complexes with various protein translation factors, tRNAs, and antibiotics using macromolecular X-ray crystallography and potentially cryo-EM techniques. Expected contributes to the design and delivery of research projects and collaborates with researchers to develop, execute, and interpret research projects. Performs complex laboratory and data collection techniques. *Duties & Responsibilities:* - Perform research relevant to the assigned projects; - Isolate, purify, and crystallize bacterial ribosomes; - Purify all additional components necessary for the crystallization experiments, such as recombinant proteins, tRNAs; - Collect X-ray diffraction data from the ribosome crystals at the APS and NSLS-II Synchrotrons; - Perform structural data analysis; - Coordinate, analyze, and document results for publication; - Directly participate in writing papers and grants based on the experimental data; - Train undergraduate and graduate students in research methods, use of equipment, record keeping, and laboratory database entry; - Attend weekly group meetings and journal club seminars. - Perform other related duties and participate in special projects as assigned. *Minimum Qualifications:* - A bachelor’s degree in chemistry, biochemistry, biophysics, or a related field is required. - A master’s degree in chemistry, biochemistry, biophysics, or a related field is preferred. - A minimum of 3 years related research experience. - Possesses and applies comprehensive knowledge of research principles, concepts, practices, and methods. - Proficient in standard molecular biology and biochemistry lab techniques, such as protein expression, and purification *Preferred Qualifications:* - Experience in structural biology (cryo-EM or X-ray crystallography); - Experience in RNA biology, ribosome, and/or protein synthesis fields. *About the University of Illinois Chicago:* UIC is among the nation’s preeminent urban public research universities, a Carnegie RU/VH research institution, and the largest university in Chicago. UIC serves over 34,000 students, comprising one of the most diverse student bodies in the nation and is designated as a Minority Serving Institution (MSI), an Asian American and Native American Pacific Islander Serving Institution (AANAPSI) and a Hispanic Serving Institution (HSI). Through its 16 colleges, UIC produces nationally and internationally recognized multidisciplinary academic programs in concert with civic, corporate and community partners worldwide, including a full complement of health sciences colleges. By emphasizing cutting-edge and transformational research along with a commitment to the success of all students, UIC embodies the dynamic, vibrant and engaged urban university. Recent “Best Colleges” rankings published by U.S. News & World Report, found UIC climbed up in its rankings among top public schools in the nation and among all national universities. UIC has nearly 260,000 alumni, and is one of the largest employers in the city of Chicago. *The University of Illinois System is an equal opportunity employer, including but not limited to disability and/or veteran status, and complies with all applicable state and federal employment mandates. Please visit Required Employment Notices and Posters <https://www.hr.uillinois.edu/cms/one.aspx?portalId=4292&pageId=5705> to view our non-discrimination statement and find additional information about required background checks, sexual harassment/misconduct disclosures, COVID-19 vaccination requirement, and employment eligibility review through E-Verify. **The university provides accommodations to applicants and employees. Request an Accommodation <https://jobs.uic.edu/request-and-accomodation/>*

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sub-unitary occupancy group restraints sum
by Kreitler, Dale 17 Apr '25

17 Apr '25

Hi, For refining an x-ray structure which has a ligand bound with multiple poses modeled as alternate confirmations, is there a way in phenix refine to maintain that the occupancy of each conformation is equal while allowing the sum total occupancy to vary (rather than equal 1)? I realize the [0,1] min/max occupancy values are adjustable parameters -- my interpretation of the docs is that this is not possible, but I thought it'd be worth asking. An example might be a ligand bound with partial occupancy near a rotational symmetry axis. Thank you, Dale ============================= Dale Kreitler AMX Beamline Scientist National Synchrotron Light Source II Building 745, Rm. 5L143 Upton, NY 11973 631-344-7318

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twinning and translational NCS issues
by Wenhui Xi 16 Apr '25

16 Apr '25

Hi all, i have this crystal which was reported severe issues with twinning and translational NCS, thus when i tried to refine its structure, the Rfree would go up to nearly 60% which making directly solving its structure very hard. i'm writing to ask are there any helpful ways to deal with this issue? Thank you! Joyce [image: image.png]

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CBMS Structural Biology Workbench - May 27 through 30, 2025 - registration deadline April 15
by Stojanoff, Vivian 14 Apr '25

14 Apr '25

Dear Colleagues, The CBMS Structural Biology Workbench will take place May 27 through 30, 2025. The first two days, May 27 and 28, are dedicated to MX and the following days May 29 and 30 to Solution Scattering and X-ray Footprintig. This is an IN-PERSON workshop. DEADLINE to REGISTER APRIL 15 https://www.bnl.gov/cbmsworkbench/ PROGRAM Macromolecular Crystallography May 27 - MX data collection on participants samples and pre-analysis May 28 - Phenix workshop "The Phenix workshop will focus on crystallographic refinement using phenix.refine. The first lecture will introduce major features and best practices of reciprocal space refinement, followed by a basic tutorial demonstrating how to run phenix.refine with default options. The second lecture will cover strategies for low-resolution refinement, including the use of secondary structure restraints and reference models. Participants who so desire will have the opportunity to work on their own data with Phenix developers available to answer questions—on phenix.refine or any other Phenix tools in the afternoon. Solution Scattering - SAXS & Xray Footprinting - XFP May 29 - Introduction to SAXS & LIX; Data collection on participants samples May 30 morning - SAXS data analysis software May 30 afternoon - Introduction to XFP and hands-on tutorial Questions can be directed to Vivian Stojanoff (stojanof(a)bnl.gov). ________________________________ To unsubscribe from the CCP4BB list, click the following link: https://www.jiscmail.ac.uk/cgi-bin/WA-JISC.exe?SUBED1=CCP4BB&A=1<https://urldefense.com/v3/__https://www.jiscmail.ac.uk/cgi-bin/WA-JISC.exe?…>

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