- phenixbb - phenix-online.org

refining a covalent-bound ligand (part 2)
by Sergio A. Sampieri 22 Jan '22

22 Jan '22

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refining a covalent-bound ligand (part 2) (try 2)
by Sergio A. Sampieri 22 Jan '22

22 Jan '22

Hi all, hope this message finds you well. As in a previous topic from 2018, I’m having problems refining a covalent-bounded ligand. The link shall be made between a carbon atom that is double bonded to an oxigen “SMILES C1=CC=C(C=C1)C=O” and the SG group of a Cys residue. I generated a CIF dictionary through AceDRG in COOT and CCP4i2. But after trying different approaches during refinement, (Automatic Linking parameters, Atom selection, acceptor & donnor, ligand bond cut off and so) the result keeps being a non bounded enzyme-ligand complex (“Not linked: pdbres="LIG A 401”). I readed in the phenixbb that this was solved by changing the nature of the ligand ( http://www.phenix-online.org/pipermail/phenixbb/2018-February/023718.html), but is not the way I would like to follow. Any suggestions or ideas would be greatly appreciated, thanks a lot for your time. Stay safe. -- “I’ve learned to think like a virus; no neurons, a lot of sex, and a lot of errors.” John J. Holland Biól. Sergio Aguirre Sampieri

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AlphaFold changes everything": new lecture on the Phenix tutorials channel
by Dorothee Liebschner 22 Jan '22

22 Jan '22

Hi everyone, I hope you will like "AlphaFold changes everything <https://www.youtube.com/watch?v=9IExeA_A8Xs>", the latest addition to the Phenix tutorials channel at www.youtube.com/c/phenixtutorials. In this full-length lecture, Tom Terwilliger shows how AphaFold models are great hypotheses that can help you jump-start structure determination by X-ray crystallography and Cryo-EM. The talk is from the ReNaFoBis.FRISBI webinar series organized by Jean Cavarelli (https://www.renafobis.fr/seminaires-web-renafobis). Best wishes, The Phenix team -- 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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Staff Scientist opportunity in "Single Molecule Biophysics" at Human Technopole in Milan, Italy
by Sebastiano Pasqualato 20 Jan '22

20 Jan '22

Dear all, another job post from the newly established life science Institute of Milan, Italy, Human Technopole (http://www.humantechnopole.it/en/ <http://www.humantechnopole.org/>) We are looking for a Staff Scientist to establish and manage a Single Molecule Biophysics Platform as a part of an ongoing collaboration with Lumicks. We are looking for persons with proven track record in single-molecule studies, with specific experience with Lumicks optical tweezers (C-trap and M-trap). The successful candidate will work in close collaboration with the Scientists of the Structural Biology Research Centre of Human Technopole (https://humantechnopole.it/en/research-centres/structural-biology/ <https://humantechnopole.it/en/research-centres/structural-biology/>), and their platform will be part of a larger number of research facilities and platforms, such as the Cryo-EM facility (https://humantechnopole.it/en/facilities/cryo-electron-microscopy-facility/ <https://humantechnopole.it/en/facilities/cryo-electron-microscopy-facility/>). More details, and how to apply can be found at the following link: https://careers.humantechnopole.it/o/staff-scientist-single-molecule-biophy… <https://careers.humantechnopole.it/o/staff-scientist-single-molecule-biophy…> Please, share this ad to anyone you think might be interested, ciao, Sebastiano PS: sorry for the double posting in different bulletin boards Sebastiano Pasqualato Biophysics Platform Manager

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Structural Biology Cryo-EM TT Asst. Professor at University of Nebraska
by Alex Vecchio 17 Jan '22

17 Jan '22

Dear PhenixBB Community, I would like to bring your attention to a Tenure-track faculty position at the rank of Assistant Professor in the Department of Biochemistry at the University of Nebraska-Lincoln (UNL). We are looking for candidates with research programs studying the structural biology of macromolecules relevant to human health or disease using cryo-EM. UNL has established a state-of-the-art cryo-EM facility that will house a Glacios 200 keV Cryo-TEM equipped with a Falcon 4i detector, a Selectris energy filter, and have capabilities for microED of crystalline samples. The candidate will be part of the Nebraska Center for Integrated Biomolecular Communication (NCIBC), an NIH-funded COBRE center, and have the opportunity to collaborate with other researchers spanning several departments across the UNL. For more information, please read our ad in Science Careers, HERE <https://jobs.sciencecareers.org/job/580579/assistant-professor-structural-b…> . To apply, please visit the UNL Employment Website, HERE <https://employment.unl.edu/postings/76851>. All the best, Alex -- *Alex J. Vecchio, Ph.D.* *Assistant Professor* *University of Nebraska–Lincoln* *Department of Biochemistry* *Center for Integrated Biomolecular Communication* 1901 Vine Street N113 / N114 Beadle Center [Lab / Office] Lincoln, NE 68588 avecchio(a)unl.edu 1 [402] 472-2933

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regarding number of unique reflections
by Viney Singh 14 Jan '22

14 Jan '22

Dear all, First of all sorry for the novice question. I *processed* one of my datasets using xds. Since I was not expecting an anomalous signal, I kept Friedel's Law = True. The number of unique reflections I got: *17,000* I used xds_ASCII.HKL after correct.LP and converted it to mtz using Phenix with 10% reflections for Rfree calculations. Now, when I am trying to* refine *the structure in Phenix, the structure is being refined against *32,300* reflections with *3230* reflections for Rfree calculation. Looks like refinement is treating Friedel's pair as two different reflections. When I am trying to upload PDB on rcsb, on the refinement tab, the number of reflections used for refinement and Rfree calculations are shown as 32,300 and 3220 respectively, while in the validation report, no. of reflections used for Rfree calculation are shown as *1700*. I would really appreciate if someone can guide me to resolve this discrepancy. Thanks in advance. Viney

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Staff Scientist opportunity in "Structural Proteomics" at Human Technopole in Milan, Italy
by Sebastiano Pasqualato 14 Jan '22

14 Jan '22

Dear all, the newly established Human Technopole Institute, based in Milan, Italy (http://www.humantechnopole.it/en/ <http://www.humantechnopole.org/>) is looking for a Staff Scientist to manage the Structural Proteomics Facility. We are looking for persons with proven track record in high-resolution MS-based proteomics, with specific experience in cross-linking- (XL) and native- MS. Structural proteomics technologies will be closely integrated with the Science Groups of the Structural Biology Research Centre of Human Technopole (https://humantechnopole.it/en/research-centres/structural-biology/ <https://humantechnopole.it/en/research-centres/structural-biology/>), and will be part of a larger number of research facilities and platforms, such as the Cryo-EM facility (https://humantechnopole.it/en/facilities/cryo-electron-microscopy-facility/ <https://humantechnopole.it/en/facilities/cryo-electron-microscopy-facility/>) More details, and how to apply can be found at the following link: https://careers.humantechnopole.it/o/staff-scientist-to-manage-a-structural… <https://careers.humantechnopole.it/o/staff-scientist-to-manage-a-structural…> Please, share this ad to anyone you think might be interested, ciao, Sebastiano PS: sorry for the double posting in different bulletin boards Sebastiano Pasqualato Biophysics Platform Manager

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Re: [phenixbb] refinement of an ensemble of structures -> cryoEM variability
by Oliver Clarke 13 Jan '22

13 Jan '22

Hi, Just to add my two cents, I agree this would be really useful for a lot of folks. Analysis of continuously distributed variability is very common these days in cryoEM, and having a way to jointly refine an ensemble of models against a series of maps would be very handy. Cryodrgn, 3D-VA in cryosparc, ManifoldEM, multibody refinement in relion - there are many tools now for generating a series of density maps potentially corresponding to conformational modes, so having the capacity in phenix to refine models against each map would be very helpful. Cheers Oli > > > Message: 1 > Date: Wed, 12 Jan 2022 10:36:27 +0100 > From: vincent Chaptal <vincent.chaptal(a)ibcp.fr> > To: Guillaume Gaullier <guillaume.gaullier(a)icm.uu.se>, Pavel Afonine > <pafonine(a)lbl.gov> > Cc: PHENIX user mailing list <phenixbb(a)phenix-online.org> > Subject: Re: [phenixbb] refinement of an ensemble of structures -> > cryoEM variability > Message-ID: <ef1a3a20-a0dc-57b0-fcc3-48a9426ce2c3(a)ibcp.fr> > Content-Type: text/plain; charset="utf-8"; Format="flowed" > > Hi Guillaume, > > thanks for the backup. > It's exactly my feeling also. > > Best > Vincent > > Le 12/01/2022 ? 10:09, Guillaume Gaullier a ?crit?: >> Hi, >> >> I am guessing what we are talking about here are the maps generated by >> cryoSPARC 3D variability analysis. See: Punjani A & Fleet DJ (2021) 3D >> Variability Analysis: Resolving continuous flexibility and discrete >> heterogeneity from single particle cryo-EM.?Journal of Structural >> Biology: 107702 https://doi.org/10.1016/j.jsb.2021.107702 >> >> But this is not the only program that generates series of maps to >> describe continuous heterogeneity from single-particle cryoEM images, >> see also cryoDRGN:?Zhong ED, Bepler T, Berger B & Davis JH (2021) >> CryoDRGN: reconstruction of heterogeneous cryo-EM structures using >> neural networks.?Nature Methods: 1?10 >> https://doi.org/10.1038/s41592-020-01049-4 >> >> Except some ideally rigid particles like apoferritin, pretty much >> everything shows some degree of flexibility that generates continuous >> heterogeneity in cryoEM images. So, my feeling is that a user-friendly >> program to fit a series of models (ideally, auto-generated from a >> single starting model) to a map series is probably going to be a >> standard requirement pretty soon for typical single-particle cryoEM >> projects. >> >> Cheers, >> >> Guillaume >> >> >>> On 11 Jan 2022, at 17:16, Pavel Afonine <pafonine(a)lbl.gov> wrote: >>> >>> Hi Vincent, >>> >>> this looks like a very specialized task that I've never heard of >>> before! We can add a tool to do that if this becomes something that >>> more than one person does more than once. Meanwhile, a simple script >>> in a language of your?preference (python, linux shell, etc) should do >>> the job. I can help with a script if needed, let me know! >>> >>> Also.. just curious -- what is "3D variability of this map"? Is this >>> one map that is a composition of several map or an ensemble of maps? >>> >>> Pavel >>> >>> On 1/11/22 01:48, vincent Chaptal wrote: >>>> Hi Phenix-ers, >>>> >>>> I thought to ask for something that I believe you have already >>>> implemented, but I'm not sure of the best tool to use. >>>> >>>> I have a cryoEM map where I refine my "high resolution" structure. I >>>> also have the 3D variability of this map that shows?several maps >>>> varying around the consensus high-res map. I want to refine an >>>> ensemble (20) of structures, one for every 20?maps around the >>>> consensus map. >>>> Is there a tool in phenix to do this? >>>> >>>> I could refine individually the high-res structure into each map >>>> incrementally; since every map differs a little from the?original >>>> one, Real-space-refinement could move the structure a little at a >>>> time. Then I could combine all the PDBs in an?ensemble? >>>> A tool to refine variability would be very useful. Input could be a >>>> PDB and an ensemble of maps, and output would be all the?PDBs combined? >>>> >>>> Thank you. >>>> >>>> All the best >>>> Vincent >>>> >>>> >>>> -- >>>> Vincent Chaptal, PhD >>>> Director of GdR APPICOM >>>> Drug Resistance and Membrane Proteins Lab >>>> >>>> MMSB -UMR5086 >>>> 7 passage du Vercors >>>> 69007 LYON >>>> FRANCE >>>> +33 4 37 65 29 01 >>>> http://www.appicom.cnrs.fr >>>> http://mmsb.cnrs.fr/en/ >>>> >>>> >>>> >>>> _______________________________________________ >>>> phenixbb mailing list >>>> >>>> phenixbb(a)phenix-online.org >>>> http://phenix-online.org/mailman/listinfo/phenixbb >>>> >>>> Unsubscribe: >>>> phenixbb-leave(a)phenix-online.org >>> _______________________________________________ >>> phenixbb mailing list >>> phenixbb(a)phenix-online.org >>> http://phenix-online.org/mailman/listinfo/phenixbb >>> Unsubscribe: phenixbb-leave(a)phenix-online.org >> >> Page Title >> >> >> >> >> >> >> >> N?r du har kontakt med oss p? Uppsala universitet med e-post s? >> inneb?r det att vi behandlar dina personuppgifter. F?r att l?sa mer om >> hur vi g?r det kan du l?sa h?r: >> 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 > > -- > > Vincent Chaptal, PhD > > Director of GdR APPICOM > > Drug Resistance and Membrane Proteins Lab > > > MMSB -UMR5086 > > 7 passage du Vercors > > 69007 LYON > > FRANCE > > +33 4 37 65 29 01 > > http://www.appicom.cnrs.fr > > http://mmsb.cnrs.fr/en/ > >

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Re: [phenixbb] refinement of an ensemble of structures -> cryoEM variability
by Oliver Clarke 13 Jan '22

13 Jan '22

I guess it isn't all that different. If you run all jobs naively starting from a single model corresponding to the overall reconstruction, depending on the magnitude of the conformational changes the maps at either end of the series may be outside the radius of convergence of phenix.real_space_refine (with default parameters). Some way to initially perturb a single model to more-or-less match the series of maps would be useful (maybe morphing in real_space_refine will already work for this?). This could probably be scripted, but having it built into phenix would be useful I think. Oli > Date: Thu, 13 Jan 2022 09:26:50 -0800 > From: James Holton <jmholton(a)lbl.gov> > To: phenixbb(a)phenix-online.org > Subject: Re: [phenixbb] refinement of an ensemble of structures -> > cryoEM variability > Message-ID: <92b5f0e3-c4b1-59f9-1c38-50fffcda0bb1(a)lbl.gov> > Content-Type: text/plain; charset=UTF-8; format=flowed > > How is that different from running parallel jobs of n models against n maps? > > On 1/13/2022 8:17 AM, Oliver Clarke wrote: >> Hi, >> >> Just to add my two cents, I agree this would be really useful for a lot of folks. Analysis of continuously distributed variability is very common these days in cryoEM, and having a way to jointly refine an ensemble of models against a series of maps would be very handy. Cryodrgn, 3D-VA in cryosparc, ManifoldEM, multibody refinement in relion - there are many tools now for generating a series of density maps potentially corresponding to conformational modes, so having the capacity in phenix to refine models against each map would be very helpful. >> >> Cheers >> Oli >> >>> >>> Message: 1 >>> Date: Wed, 12 Jan 2022 10:36:27 +0100 >>> From: vincent Chaptal <vincent.chaptal(a)ibcp.fr> >>> To: Guillaume Gaullier <guillaume.gaullier(a)icm.uu.se>, Pavel Afonine >>> <pafonine(a)lbl.gov> >>> Cc: PHENIX user mailing list <phenixbb(a)phenix-online.org> >>> Subject: Re: [phenixbb] refinement of an ensemble of structures -> >>> cryoEM variability >>> Message-ID: <ef1a3a20-a0dc-57b0-fcc3-48a9426ce2c3(a)ibcp.fr> >>> Content-Type: text/plain; charset="utf-8"; Format="flowed" >>> >>> Hi Guillaume, >>> >>> thanks for the backup. >>> It's exactly my feeling also. >>> >>> Best >>> Vincent >>> >>> Le 12/01/2022 ? 10:09, Guillaume Gaullier a ?crit?: >>>> Hi, >>>> >>>> I am guessing what we are talking about here are the maps generated by >>>> cryoSPARC 3D variability analysis. See: Punjani A & Fleet DJ (2021) 3D >>>> Variability Analysis: Resolving continuous flexibility and discrete >>>> heterogeneity from single particle cryo-EM.?Journal of Structural >>>> Biology: 107702 https://doi.org/10.1016/j.jsb.2021.107702 >>>> >>>> But this is not the only program that generates series of maps to >>>> describe continuous heterogeneity from single-particle cryoEM images, >>>> see also cryoDRGN:?Zhong ED, Bepler T, Berger B & Davis JH (2021) >>>> CryoDRGN: reconstruction of heterogeneous cryo-EM structures using >>>> neural networks.?Nature Methods: 1?10 >>>> https://doi.org/10.1038/s41592-020-01049-4 >>>> >>>> Except some ideally rigid particles like apoferritin, pretty much >>>> everything shows some degree of flexibility that generates continuous >>>> heterogeneity in cryoEM images. So, my feeling is that a user-friendly >>>> program to fit a series of models (ideally, auto-generated from a >>>> single starting model) to a map series is probably going to be a >>>> standard requirement pretty soon for typical single-particle cryoEM >>>> projects. >>>> >>>> Cheers, >>>> >>>> Guillaume >>>> >>>> >>>>> On 11 Jan 2022, at 17:16, Pavel Afonine <pafonine(a)lbl.gov> wrote: >>>>> >>>>> Hi Vincent, >>>>> >>>>> this looks like a very specialized task that I've never heard of >>>>> before! We can add a tool to do that if this becomes something that >>>>> more than one person does more than once. Meanwhile, a simple script >>>>> in a language of your?preference (python, linux shell, etc) should do >>>>> the job. I can help with a script if needed, let me know! >>>>> >>>>> Also.. just curious -- what is "3D variability of this map"? Is this >>>>> one map that is a composition of several map or an ensemble of maps? >>>>> >>>>> Pavel >>>>> >>>>> On 1/11/22 01:48, vincent Chaptal wrote: >>>>>> Hi Phenix-ers, >>>>>> >>>>>> I thought to ask for something that I believe you have already >>>>>> implemented, but I'm not sure of the best tool to use. >>>>>> >>>>>> I have a cryoEM map where I refine my "high resolution" structure. I >>>>>> also have the 3D variability of this map that shows?several maps >>>>>> varying around the consensus high-res map. I want to refine an >>>>>> ensemble (20) of structures, one for every 20?maps around the >>>>>> consensus map. >>>>>> Is there a tool in phenix to do this? >>>>>> >>>>>> I could refine individually the high-res structure into each map >>>>>> incrementally; since every map differs a little from the?original >>>>>> one, Real-space-refinement could move the structure a little at a >>>>>> time. Then I could combine all the PDBs in an?ensemble? >>>>>> A tool to refine variability would be very useful. Input could be a >>>>>> PDB and an ensemble of maps, and output would be all the?PDBs combined? >>>>>> >>>>>> Thank you. >>>>>> >>>>>> All the best >>>>>> Vincent >>>>>> >>>>>> >>>>>> -- >>>>>> Vincent Chaptal, PhD >>>>>> Director of GdR APPICOM >>>>>> Drug Resistance and Membrane Proteins Lab >>>>>> >>>>>> MMSB -UMR5086 >>>>>> 7 passage du Vercors >>>>>> 69007 LYON >>>>>> FRANCE >>>>>> +33 4 37 65 29 01 >>>>>> http://www.appicom.cnrs.fr >>>>>> http://mmsb.cnrs.fr/en/ >>>>>> >>>>>> >>>>>> >>>>>> _______________________________________________ >>>>>> phenixbb mailing list >>>>>> >>>>>> phenixbb(a)phenix-online.org >>>>>> http://phenix-online.org/mailman/listinfo/phenixbb >>>>>> >>>>>> Unsubscribe: >>>>>> phenixbb-leave(a)phenix-online.org >>>>> _______________________________________________ >>>>> phenixbb mailing list >>>>> phenixbb(a)phenix-online.org >>>>> http://phenix-online.org/mailman/listinfo/phenixbb >>>>> Unsubscribe: phenixbb-leave(a)phenix-online.org >>>> Page Title >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> N?r du har kontakt med oss p? Uppsala universitet med e-post s? >>>> inneb?r det att vi behandlar dina personuppgifter. F?r att l?sa mer om >>>> hur vi g?r det kan du l?sa h?r: >>>> 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 >>> -- >>> >>> Vincent Chaptal, PhD >>> >>> Director of GdR APPICOM >>> >>> Drug Resistance and Membrane Proteins Lab >>> >>> >>> MMSB -UMR5086 >>> >>> 7 passage du Vercors >>> >>> 69007 LYON >>> >>> FRANCE >>> >>> +33 4 37 65 29 01 >>> >>> http://www.appicom.cnrs.fr >>> >>> http://mmsb.cnrs.fr/en/ >>> >>>

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refinement of an ensemble of structures -> cryoEM variability
by vincent Chaptal 12 Jan '22

12 Jan '22

Hi Phenix-ers, I thought to ask for something that I believe you have already implemented, but I'm not sure of the best tool to use. I have a cryoEM map where I refine my "high resolution" structure. I also have the 3D variability of this map that shows several maps varying around the consensus high-res map. I want to refine an ensemble (20) of structures, one for every 20 maps around the consensus map. Is there a tool in phenix to do this? I could refine individually the high-res structure into each map incrementally; since every map differs a little from the original one, Real-space-refinement could move the structure a little at a time. Then I could combine all the PDBs in an ensemble? A tool to refine variability would be very useful. Input could be a PDB and an ensemble of maps, and output would be all the PDBs combined? Thank you. All the best Vincent -- Vincent Chaptal, PhD Director of GdR APPICOM Drug Resistance and Membrane Proteins Lab MMSB -UMR5086 7 passage du Vercors 69007 LYON FRANCE +33 4 37 65 29 01 http://www.appicom.cnrs.fr http://mmsb.cnrs.fr/en/

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