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Srinivasa Raghavan S, Miyashita O. ResiDEM: Analytical Tool for Isomorphous Difference Electron Density Maps Utilizing Dynamic Residue Identification via Density Clustering. J Chem Inf Model 2024; 64:7565-7575. [PMID: 39299702 PMCID: PMC11483099 DOI: 10.1021/acs.jcim.4c00858] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2024] [Revised: 07/25/2024] [Accepted: 08/14/2024] [Indexed: 09/22/2024]
Abstract
Time-resolved serial femtosecond crystallography (TR-SFX) of biological molecules captures the time-evolved dynamics of the residual motions across crystal structures, enabling the visualization of structural changes in response to chemical and physical stimuli to elucidate the relationship between the structure and function of the system under study. However, interpretations of residual motions can be complex to deconvolute because of various factors such as the system's size, temporal and spatial complexity, and allosteric behavior away from active sites. Relying solely on electron density map visualization can also pose a challenge in differentiating between useful and irrelevant data. In order to accurately identify residues and determine their respective contributions to the reaction dynamics, new tools are needed. We developed a new tool, ResiDEM, which employs a clustering-based approach to group difference electron densities and associate them with proximal residues. It can identify and rank residues with significant motions. Network representation can be used to delineate the interrelations between the residues in motion. With these features, ResiDEM helps to interpret residual motions in TR-SFX data, identify key residues, and elucidate their roles in dynamic processes.
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Affiliation(s)
- Sriram Srinivasa Raghavan
- RIKEN Center for Computational
Science, 6-7-1 Minatojima-minami-machi, Chuo-ku, Kobe, Hyogo 650-0047, Japan
| | - Osamu Miyashita
- RIKEN Center for Computational
Science, 6-7-1 Minatojima-minami-machi, Chuo-ku, Kobe, Hyogo 650-0047, Japan
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2
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Ren Z, Yang X. Deconvolution of dynamic heterogeneity in protein structure. STRUCTURAL DYNAMICS (MELVILLE, N.Y.) 2024; 11:041302. [PMID: 39165899 PMCID: PMC11335360 DOI: 10.1063/4.0000261] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/03/2024] [Accepted: 07/30/2024] [Indexed: 08/22/2024]
Abstract
Heterogeneity is intrinsic to the dynamic process of a chemical reaction. As reactants are converted to products via intermediates, the nature and extent of heterogeneity vary temporally throughout the duration of the reaction and spatially across the molecular ensemble. The goal of many biophysical techniques, including crystallography and spectroscopy, is to establish a reaction trajectory that follows an experimentally provoked dynamic process. It is essential to properly analyze and resolve heterogeneity inevitably embedded in experimental datasets. We have developed a deconvolution technique based on singular value decomposition (SVD), which we have rigorously practiced in diverse research projects. In this review, we recapitulate the motivation and challenges in addressing the heterogeneity problem and lay out the mathematical foundation of our methodology that enables isolation of chemically sensible structural signals. We also present a few case studies to demonstrate the concept and outcome of the SVD-based deconvolution. Finally, we highlight a few recent studies with mechanistic insights made possible by heterogeneity deconvolution.
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Affiliation(s)
- Zhong Ren
- Authors to whom correspondence should be addressed: and
| | - Xiaojing Yang
- Authors to whom correspondence should be addressed: and
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3
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Mehrabi P, Sung S, von Stetten D, Prester A, Hatton CE, Kleine-Döpke S, Berkes A, Gore G, Leimkohl JP, Schikora H, Kollewe M, Rohde H, Wilmanns M, Tellkamp F, Schulz EC. Millisecond cryo-trapping by the spitrobot crystal plunger simplifies time-resolved crystallography. Nat Commun 2023; 14:2365. [PMID: 37185266 PMCID: PMC10130016 DOI: 10.1038/s41467-023-37834-w] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2022] [Accepted: 04/01/2023] [Indexed: 05/17/2023] Open
Abstract
We introduce the spitrobot, a protein crystal plunger, enabling reaction quenching via cryo-trapping with a time-resolution in the millisecond range. Protein crystals are mounted on canonical micromeshes on an electropneumatic piston, where the crystals are kept in a humidity and temperature-controlled environment, then reactions are initiated via the liquid application method (LAMA) and plunging into liquid nitrogen is initiated after an electronically set delay time to cryo-trap intermediate states. High-magnification images are automatically recorded before and after droplet deposition, prior to plunging. The SPINE-standard sample holder is directly plunged into a storage puck, enabling compatibility with high-throughput infrastructure. Here we demonstrate binding of glucose and 2,3-butanediol in microcrystals of xylose isomerase, and of avibactam and ampicillin in microcrystals of the extended spectrum beta-lactamase CTX-M-14. We also trap reaction intermediates and conformational changes in macroscopic crystals of tryptophan synthase to demonstrate that the spitrobot enables insight into catalytic events.
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Affiliation(s)
- Pedram Mehrabi
- Institute for Nanostructure and Solid-State Physics, Universität Hamburg, Hamburg, Germany.
- Max Planck Institute for the Structure and Dynamics of Matter, Hamburg, Germany.
| | - Sihyun Sung
- European Molecular Biology Laboratory, Hamburg Unit, Hamburg, Germany
| | - David von Stetten
- European Molecular Biology Laboratory, Hamburg Unit, Hamburg, Germany
| | - Andreas Prester
- University Medical Center Hamburg-Eppendorf (UKE), Hamburg, Germany
| | - Caitlin E Hatton
- Institute for Nanostructure and Solid-State Physics, Universität Hamburg, Hamburg, Germany
| | - Stephan Kleine-Döpke
- Institute for Nanostructure and Solid-State Physics, Universität Hamburg, Hamburg, Germany
| | - Alexander Berkes
- Institute for Nanostructure and Solid-State Physics, Universität Hamburg, Hamburg, Germany
| | - Gargi Gore
- Institute for Nanostructure and Solid-State Physics, Universität Hamburg, Hamburg, Germany
| | | | - Hendrik Schikora
- Max Planck Institute for the Structure and Dynamics of Matter, Hamburg, Germany
| | - Martin Kollewe
- Max Planck Institute for the Structure and Dynamics of Matter, Hamburg, Germany
| | - Holger Rohde
- University Medical Center Hamburg-Eppendorf (UKE), Hamburg, Germany
| | - Matthias Wilmanns
- European Molecular Biology Laboratory, Hamburg Unit, Hamburg, Germany
- University Medical Center Hamburg-Eppendorf (UKE), Hamburg, Germany
| | - Friedjof Tellkamp
- Max Planck Institute for the Structure and Dynamics of Matter, Hamburg, Germany.
| | - Eike C Schulz
- Institute for Nanostructure and Solid-State Physics, Universität Hamburg, Hamburg, Germany.
- Max Planck Institute for the Structure and Dynamics of Matter, Hamburg, Germany.
- University Medical Center Hamburg-Eppendorf (UKE), Hamburg, Germany.
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4
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Resolving the challenge of insoluble production of mature human growth differentiation factor 9 protein (GDF9) in E. coli using bicistronic expression with thioredoxin. Int J Biol Macromol 2023; 230:123225. [PMID: 36649874 DOI: 10.1016/j.ijbiomac.2023.123225] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2022] [Revised: 01/06/2023] [Accepted: 01/07/2023] [Indexed: 01/15/2023]
Abstract
Growth differentiation factor 9 (GDF9) is an oocyte-derived protein with fundamental functions in folliculogenesis. While the crucial contributions of GDF9 in follicular survival have been revealed, crystallographic studies of GDF9 structure have not yet been carried out, essentially due to the insoluble expression of GDF9 in E. coli and lack of appropriate source for structural studies. Therefore, in this study, we investigated the impact of different expression rate of bacterial thioredoxin (TrxA) using bicistronic expression constructs to induce the soluble expression of mature human GDF9 (hGDF9) driven by T7 promoter in E. coli. Our findings revealed that in BL21(DE3), the high rate of TrxA co-expression at 30 °C was sufficiently potent for the soluble expression of hGDF9 and reduction of inclusion body formation by 4 fold. We also successfully confirmed the bioactivity of the purified soluble hGDF9 protein by evaluation of follicle-stimulating hormone receptor gene expression in bovine cumulus cells derived from small follicles. This study is the first to present an effective approach for expression of bioactive form of hGDF9 using TrxA co-expression in E. coli, which may unravel the current issues regarding structural analysis of hGDF9 protein and consequently provide a better insight into hGDF9 functions and interactions.
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5
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Tandrup T, Muderspach SJ, Banerjee S, Santoni G, Ipsen JØ, Hernández-Rollán C, Nørholm MHH, Johansen KS, Meilleur F, Lo Leggio L. Changes in active-site geometry on X-ray photoreduction of a lytic polysaccharide monooxygenase active-site copper and saccharide binding. IUCRJ 2022; 9:666-681. [PMID: 36071795 PMCID: PMC9438499 DOI: 10.1107/s2052252522007175] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/03/2022] [Accepted: 07/12/2022] [Indexed: 06/15/2023]
Abstract
The recently discovered lytic polysaccharide monooxygenases (LPMOs) are Cu-containing enzymes capable of degrading polysaccharide substrates oxidatively. The generally accepted first step in the LPMO reaction is the reduction of the active-site metal ion from Cu2+ to Cu+. Here we have used a systematic diffraction data collection method to monitor structural changes in two AA9 LPMOs, one from Lentinus similis (LsAA9_A) and one from Thermoascus auranti-acus (TaAA9_A), as the active-site Cu is photoreduced in the X-ray beam. For LsAA9_A, the protein produced in two different recombinant systems was crystallized to probe the effect of post-translational modifications and different crystallization conditions on the active site and metal photoreduction. We can recommend that crystallographic studies of AA9 LPMOs wishing to address the Cu2+ form use a total X-ray dose below 3 × 104 Gy, while the Cu+ form can be attained using 1 × 106 Gy. In all cases, we observe the transition from a hexa-coordinated Cu site with two solvent-facing ligands to a T-shaped geometry with no exogenous ligands, and a clear increase of the θ2 parameter and a decrease of the θ3 parameter by averages of 9.2° and 8.4°, respectively, but also a slight increase in θT. Thus, the θ2 and θ3 parameters are helpful diagnostics for the oxidation state of the metal in a His-brace protein. On binding of cello-oligosaccharides to LsAA9_A, regardless of the production source, the θT parameter increases, making the Cu site less planar, while the active-site Tyr-Cu distance decreases reproducibly for the Cu2+ form. Thus, the θT increase found on copper reduction may bring LsAA9_A closer to an oligosaccharide-bound state and contribute to the observed higher affinity of reduced LsAA9_A for cellulosic substrates.
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Affiliation(s)
- Tobias Tandrup
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100-DK, Copenhagen, Denmark
| | - Sebastian J. Muderspach
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100-DK, Copenhagen, Denmark
| | - Sanchari Banerjee
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100-DK, Copenhagen, Denmark
| | - Gianluca Santoni
- ESRF, Structural Biology Group, 71 avenue des Martyrs, 38027 Grenoble cedex, France
| | - Johan Ø. Ipsen
- Department of Geosciences and Natural Resource Management, University of Copenhagen, 1958-DK, Frederiksberg, Denmark
| | - Cristina Hernández-Rollán
- Novo Nordisk Foundation Center for Biosustainability, Technical University of Denmark, 2800-DK, Kgs. Lyngby, Denmark
| | - Morten H. H. Nørholm
- Novo Nordisk Foundation Center for Biosustainability, Technical University of Denmark, 2800-DK, Kgs. Lyngby, Denmark
| | - Katja S. Johansen
- Department of Geosciences and Natural Resource Management, University of Copenhagen, 1958-DK, Frederiksberg, Denmark
| | - Flora Meilleur
- Department of Molecular and Structural Biochemistry, North Carolina State University, Campus Box 7622, Raleigh, NC 27695, USA
- Neutron Scattering Division, Oak Ridge National Laboratory, PO Box 2008, Oak Ridge, TN 37831, USA
| | - Leila Lo Leggio
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100-DK, Copenhagen, Denmark
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6
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Advancements in macromolecular crystallography: from past to present. Emerg Top Life Sci 2021; 5:127-149. [PMID: 33969867 DOI: 10.1042/etls20200316] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2021] [Revised: 04/09/2021] [Accepted: 04/15/2021] [Indexed: 11/17/2022]
Abstract
Protein Crystallography or Macromolecular Crystallography (MX) started as a new discipline of science with the pioneering work on the determination of the protein crystal structures by John Kendrew in 1958 and Max Perutz in 1960. The incredible achievements in MX are attributed to the development of advanced tools, methodologies, and automation in every aspect of the structure determination process, which have reduced the time required for solving protein structures from years to a few days, as evident from the tens of thousands of crystal structures of macromolecules available in PDB. The advent of brilliant synchrotron sources, fast detectors, and novel sample delivery methods has shifted the paradigm from static structures to understanding the dynamic picture of macromolecules; further propelled by X-ray Free Electron Lasers (XFELs) that explore the femtosecond regime. The revival of the Laue diffraction has also enabled the understanding of macromolecules through time-resolved crystallography. In this review, we present some of the astonishing method-related and technological advancements that have contributed to the progress of MX. Even with the rapid evolution of several methods for structure determination, the developments in MX will keep this technique relevant and it will continue to play a pivotal role in gaining unprecedented atomic-level details as well as revealing the dynamics of biological macromolecules. With many exciting developments awaiting in the upcoming years, MX has the potential to contribute significantly to the growth of modern biology by unraveling the mechanisms of complex biological processes as well as impacting the area of drug designing.
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7
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Molecular Mechanism of Thymidylate Synthase Inhibition by N 4-Hydroxy-dCMP in View of Spectrophotometric and Crystallographic Studies. Int J Mol Sci 2021; 22:ijms22094758. [PMID: 33946210 PMCID: PMC8125507 DOI: 10.3390/ijms22094758] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2021] [Revised: 04/27/2021] [Accepted: 04/29/2021] [Indexed: 11/17/2022] Open
Abstract
Novel evidence is presented allowing further clarification of the mechanism of the slow-binding thymidylate synthase (TS) inhibition by N4-hydroxy-dCMP (N4-OH-dCMP). Spectrophotometric monitoring documented time- and temperature-, and N4-OH-dCMP-dependent TS-catalyzed dihydrofolate production, accompanying the mouse enzyme incubation with N4-OH-dCMP and N5,10-methylenetetrahydrofolate, known to inactivate the enzyme by the covalent binding of the inhibitor, suggesting the demonstrated reaction to be uncoupled from the pyrimidine C(5) methylation. The latter was in accord with the hypothesis based on the previously presented structure of mouse TS (cf. PDB ID: 4EZ8), and with conclusions based on the present structure of the parasitic nematode Trichinella spiralis, both co-crystallized with N4-OH-dCMP and N5,10-methylenetetrahdrofolate. The crystal structure of the mouse TS-N4-OH-dCMP complex soaked with N5,10-methylenetetrahydrofolate revealed the reaction to run via a unique imidazolidine ring opening, leaving the one-carbon group bound to the N(10) atom, thus too distant from the pyrimidine C(5) atom to enable the electrophilic attack and methylene group transfer.
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8
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Poddar H, Heyes DJ, Schirò G, Weik M, Leys D, Scrutton NS. A guide to time-resolved structural analysis of light-activated proteins. FEBS J 2021; 289:576-595. [PMID: 33864718 DOI: 10.1111/febs.15880] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2021] [Revised: 04/03/2021] [Accepted: 04/13/2021] [Indexed: 01/08/2023]
Abstract
Dynamical changes in protein structures are essential for protein function and occur over femtoseconds to seconds timescales. X-ray free electron lasers have facilitated investigations of structural dynamics in proteins with unprecedented temporal and spatial resolution. Light-activated proteins are attractive targets for time-resolved structural studies, as the reaction chemistry and associated protein structural changes can be triggered by short laser pulses. Proteins with different light-absorbing centres have evolved to detect light and harness photon energy to bring about downstream chemical and biological output responses. Following light absorption, rapid chemical/small-scale structural changes are typically localised around the chromophore. These localised changes are followed by larger structural changes propagated throughout the photoreceptor/photocatalyst that enables the desired chemical and/or biological output response. Time-resolved serial femtosecond crystallography (SFX) and solution scattering techniques enable direct visualisation of early chemical change in light-activated proteins on timescales previously inaccessible, whereas scattering gives access to slower timescales associated with more global structural change. Here, we review how advances in time-resolved SFX and solution scattering techniques have uncovered mechanisms of photochemistry and its coupling to output responses. We also provide a prospective on how these time-resolved structural approaches might impact on other photoreceptors/photoenzymes that have not yet been studied by these methods.
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Affiliation(s)
- Harshwardhan Poddar
- Manchester Institute of Biotechnology, Department of Chemistry, University of Manchester, UK
| | - Derren J Heyes
- Manchester Institute of Biotechnology, Department of Chemistry, University of Manchester, UK
| | - Giorgio Schirò
- Institut de Biologie Structurale, Univ. Grenoble Alpes, CEA, CNRS, Grenoble, France
| | - Martin Weik
- Institut de Biologie Structurale, Univ. Grenoble Alpes, CEA, CNRS, Grenoble, France
| | - David Leys
- Manchester Institute of Biotechnology, Department of Chemistry, University of Manchester, UK
| | - Nigel S Scrutton
- Manchester Institute of Biotechnology, Department of Chemistry, University of Manchester, UK
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9
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Han H, Round E, Schubert R, Gül Y, Makroczyová J, Meza D, Heuser P, Aepfelbacher M, Barák I, Betzel C, Fromme P, Kursula I, Nissen P, Tereschenko E, Schulz J, Uetrecht C, Ulicný J, Wilmanns M, Hajdu J, Lamzin VS, Lorenzen K. The XBI BioLab for life science experiments at the European XFEL. J Appl Crystallogr 2021; 54:7-21. [PMID: 33833637 PMCID: PMC7941304 DOI: 10.1107/s1600576720013989] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2020] [Accepted: 10/19/2020] [Indexed: 11/26/2022] Open
Abstract
The science of X-ray free-electron lasers (XFELs) critically depends on the performance of the X-ray laser and on the quality of the samples placed into the X-ray beam. The stability of biological samples is limited and key biomolecular transformations occur on short timescales. Experiments in biology require a support laboratory in the immediate vicinity of the beamlines. The XBI BioLab of the European XFEL (XBI denotes XFEL Biology Infrastructure) is an integrated user facility connected to the beamlines for supporting a wide range of biological experiments. The laboratory was financed and built by a collaboration between the European XFEL and the XBI User Consortium, whose members come from Finland, Germany, the Slovak Republic, Sweden and the USA, with observers from Denmark and the Russian Federation. Arranged around a central wet laboratory, the XBI BioLab provides facilities for sample preparation and scoring, laboratories for growing prokaryotic and eukaryotic cells, a Bio Safety Level 2 laboratory, sample purification and characterization facilities, a crystallization laboratory, an anaerobic laboratory, an aerosol laboratory, a vacuum laboratory for injector tests, and laboratories for optical microscopy, atomic force microscopy and electron microscopy. Here, an overview of the XBI facility is given and some of the results of the first user experiments are highlighted.
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Affiliation(s)
- Huijong Han
- European XFEL GmbH, Holzkoppel 4, 22869 Schenefeld, Germany
- Biocenter Oulu and Faculty of Biochemistry and Molecular Medicine, University of Oulu, Aapistie 7, 90220 Oulu, Finland
| | - Ekaterina Round
- European Molecular Biology Laboratory, Notkestrasse 85, 22607 Hamburg, Germany
| | - Robin Schubert
- European XFEL GmbH, Holzkoppel 4, 22869 Schenefeld, Germany
- Institute of Biochemistry and Molecular Biology, Laboratory for Structural Biology of Infection and Inflammation, University of Hamburg, c/o DESY, Building 22a, Notkestrasse 85, 22603 Hamburg, Germany
- The Hamburg Centre for Ultrafast Imaging (CUI), Luruper Chaussee 149, 22761 Hamburg, Germany
| | - Yasmin Gül
- European Molecular Biology Laboratory, Notkestrasse 85, 22607 Hamburg, Germany
| | - Jana Makroczyová
- European XFEL GmbH, Holzkoppel 4, 22869 Schenefeld, Germany
- Institute of Molecular Biology, Slovak Academy of Sciences, Dúbravská cesta 21, 845 51 Bratislava, Slovak Republic
| | - Domingo Meza
- Biodesign Center for Applied Structural Discovery and School of Molecular Sciences, Arizona State University, Tempe, AZ, USA
| | - Philipp Heuser
- European Molecular Biology Laboratory, Notkestrasse 85, 22607 Hamburg, Germany
| | - Martin Aepfelbacher
- Institute of Medical Microbiology, Virology and Hygiene, University Medical Center Hamburg Eppendorf, Martinistrasse 52, 20246 Hamburg, Germany
| | - Imrich Barák
- Institute of Molecular Biology, Slovak Academy of Sciences, Dúbravská cesta 21, 845 51 Bratislava, Slovak Republic
| | - Christian Betzel
- Institute of Biochemistry and Molecular Biology, Laboratory for Structural Biology of Infection and Inflammation, University of Hamburg, c/o DESY, Building 22a, Notkestrasse 85, 22603 Hamburg, Germany
- The Hamburg Centre for Ultrafast Imaging (CUI), Luruper Chaussee 149, 22761 Hamburg, Germany
| | - Petra Fromme
- Biodesign Center for Applied Structural Discovery and School of Molecular Sciences, Arizona State University, Tempe, AZ, USA
| | - Inari Kursula
- Biocenter Oulu and Faculty of Biochemistry and Molecular Medicine, University of Oulu, Aapistie 7, 90220 Oulu, Finland
- Department of Biomedicine, University of Bergen, Jonas Lies vei 91, 5009 Bergen, Norway
| | - Poul Nissen
- DANDRITE, Nordic EMBL Partnership for Molecular Medicine, Aarhus University, Department of Molecular Biology and Genetics, Gustav Wieds Vej 10C, DK – 8000 Aarhus C, Denmark
| | - Elena Tereschenko
- Institute of Crystallography, Russian Academy of Sciences, 59 Leninsky prospekt, Moscow, 117333, Russian Federation
| | - Joachim Schulz
- European XFEL GmbH, Holzkoppel 4, 22869 Schenefeld, Germany
| | - Charlotte Uetrecht
- European XFEL GmbH, Holzkoppel 4, 22869 Schenefeld, Germany
- Heinrich Pette Institute, Leibniz Institute for Experimental Virology, Martinistrasse 52, 20251 Hamburg, Germany
| | - Jozef Ulicný
- Department of Biophysics, Institute of Physics, Faculty of Science, P. J. Šafárik University, Jesenná 5, 04154 Košice, Slovak Republic
| | - Matthias Wilmanns
- European Molecular Biology Laboratory, Notkestrasse 85, 22607 Hamburg, Germany
| | - Janos Hajdu
- The European Extreme Light Infrastructure, Institute of Physics, Academy of Sciences of the Czech Republic, Za Radnici 835, 25241 Dolní Břežany, Czech Republic
- Laboratory of Molecular Biophysics, Department of Cell and Molecular Biology, Uppsala University, Husargatan 3 (Box 596), SE-751 24 Uppsala, Sweden
| | - Victor S. Lamzin
- European Molecular Biology Laboratory, Notkestrasse 85, 22607 Hamburg, Germany
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10
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Pump-Probe Time-Resolved Serial Femtosecond Crystallography at X-Ray Free Electron Lasers. CRYSTALS 2020. [DOI: 10.3390/cryst10070628] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
With time-resolved crystallography (TRX), it is possible to follow the reaction dynamics in biological macromolecules by investigating the structure of transient states along the reaction coordinate. X-ray free electron lasers (XFELs) have enabled TRX experiments on previously uncharted femtosecond timescales. Here, we review the recent developments, opportunities, and challenges of pump-probe TRX at XFELs.
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11
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Frustaci S, Vollmer F. Whispering-gallery mode (WGM) sensors: review of established and WGM-based techniques to study protein conformational dynamics. Curr Opin Chem Biol 2019; 51:66-73. [PMID: 31202140 DOI: 10.1016/j.cbpa.2019.05.003] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2019] [Revised: 04/29/2019] [Accepted: 05/03/2019] [Indexed: 12/31/2022]
Abstract
Monitoring the conformational dynamics of proteins is crucial for a better understanding of their biological functions. To observe the structural dynamics of proteins, it is often necessary to study each molecule individually. To this end, single-molecule techniques have been developed such as Förster resonance energy transfer and optical tweezers. However, although powerful, these techniques do have their limitations, for example, limited temporal resolution, or necessity for fluorescent labelling, and they can often only access a limited set of all protein motions. Here, within the context of established structural biology techniques, we review a new class of highly sensitive optical devices based on WGM, which characterise protein dynamics on previously inaccessible timescales, visualise motions throughout a protein, and track movements of single atoms.
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Affiliation(s)
- Simona Frustaci
- Department of Physics and Astronomy, Living Systems Institute, University of Exeter, EX4 4QD, UK.
| | - Frank Vollmer
- Department of Physics and Astronomy, Living Systems Institute, University of Exeter, EX4 4QD, UK.
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12
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Olmos JL, Pandey S, Martin-Garcia JM, Calvey G, Katz A, Knoska J, Kupitz C, Hunter MS, Liang M, Oberthuer D, Yefanov O, Wiedorn M, Heyman M, Holl M, Pande K, Barty A, Miller MD, Stern S, Roy-Chowdhury S, Coe J, Nagaratnam N, Zook J, Verburgt J, Norwood T, Poudyal I, Xu D, Koglin J, Seaberg MH, Zhao Y, Bajt S, Grant T, Mariani V, Nelson G, Subramanian G, Bae E, Fromme R, Fung R, Schwander P, Frank M, White TA, Weierstall U, Zatsepin N, Spence J, Fromme P, Chapman HN, Pollack L, Tremblay L, Ourmazd A, Phillips GN, Schmidt M. Enzyme intermediates captured "on the fly" by mix-and-inject serial crystallography. BMC Biol 2018; 16:59. [PMID: 29848358 PMCID: PMC5977757 DOI: 10.1186/s12915-018-0524-5] [Citation(s) in RCA: 105] [Impact Index Per Article: 17.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2018] [Accepted: 05/03/2018] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND Ever since the first atomic structure of an enzyme was solved, the discovery of the mechanism and dynamics of reactions catalyzed by biomolecules has been the key goal for the understanding of the molecular processes that drive life on earth. Despite a large number of successful methods for trapping reaction intermediates, the direct observation of an ongoing reaction has been possible only in rare and exceptional cases. RESULTS Here, we demonstrate a general method for capturing enzyme catalysis "in action" by mix-and-inject serial crystallography (MISC). Specifically, we follow the catalytic reaction of the Mycobacterium tuberculosis β-lactamase with the third-generation antibiotic ceftriaxone by time-resolved serial femtosecond crystallography. The results reveal, in near atomic detail, antibiotic cleavage and inactivation from 30 ms to 2 s. CONCLUSIONS MISC is a versatile and generally applicable method to investigate reactions of biological macromolecules, some of which are of immense biological significance and might be, in addition, important targets for structure-based drug design. With megahertz X-ray pulse rates expected at the Linac Coherent Light Source II and the European X-ray free-electron laser, multiple, finely spaced time delays can be collected rapidly, allowing a comprehensive description of biomolecular reactions in terms of structure and kinetics from the same set of X-ray data.
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Affiliation(s)
- Jose L Olmos
- Department of BioSciences, Rice University, 6100 Main Street, Houston, TX, 77005, USA
| | - Suraj Pandey
- Physics Department, University of Wisconsin-Milwaukee, 3135 N. Maryland Ave, Milwaukee, WI, 53211, USA
| | - Jose M Martin-Garcia
- School of Molecular Sciences and Biodesign Center for Applied Structural Discovery, Arizona State University, Tempe, AZ, 85287-1604, USA
| | - George Calvey
- School of Applied and Engineering Physics, Cornell University, 254 Clark Hall, Ithaca, NY, 14853, USA
| | - Andrea Katz
- School of Applied and Engineering Physics, Cornell University, 254 Clark Hall, Ithaca, NY, 14853, USA
| | - Juraj Knoska
- Center for Free-Electron Laser Science, DESY, Notkestrasse 85, 22607, Hamburg, Germany
- University of Hamburg, Luruper Chaussee 149, 22761, Hamburg, Germany
| | - Christopher Kupitz
- Physics Department, University of Wisconsin-Milwaukee, 3135 N. Maryland Ave, Milwaukee, WI, 53211, USA
| | - Mark S Hunter
- Linac Coherent Light Source, Stanford Linear Accelerator Center (SLAC) National, Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA
| | - Mengning Liang
- Linac Coherent Light Source, Stanford Linear Accelerator Center (SLAC) National, Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA
| | - Dominik Oberthuer
- Center for Free-Electron Laser Science, DESY, Notkestrasse 85, 22607, Hamburg, Germany
| | - Oleksandr Yefanov
- Center for Free-Electron Laser Science, DESY, Notkestrasse 85, 22607, Hamburg, Germany
| | - Max Wiedorn
- Center for Free-Electron Laser Science, DESY, Notkestrasse 85, 22607, Hamburg, Germany
- University of Hamburg, Luruper Chaussee 149, 22761, Hamburg, Germany
| | - Michael Heyman
- Max Planck Institut fuer Biochemie, Am Klopferspitz 18, 82152, Planegg, Germany
| | - Mark Holl
- School of Molecular Sciences and Biodesign Center for Applied Structural Discovery, Arizona State University, Tempe, AZ, 85287-1604, USA
| | - Kanupriya Pande
- Lawrence Berkeley National Lab, 1 Cyclotron Road, Berkeley, CA, 94720, USA
| | - Anton Barty
- Center for Free-Electron Laser Science, DESY, Notkestrasse 85, 22607, Hamburg, Germany
| | - Mitchell D Miller
- Department of BioSciences, Rice University, 6100 Main Street, Houston, TX, 77005, USA
| | - Stephan Stern
- Center for Free-Electron Laser Science, DESY, Notkestrasse 85, 22607, Hamburg, Germany
| | - Shatabdi Roy-Chowdhury
- School of Molecular Sciences and Biodesign Center for Applied Structural Discovery, Arizona State University, Tempe, AZ, 85287-1604, USA
| | - Jesse Coe
- School of Molecular Sciences and Biodesign Center for Applied Structural Discovery, Arizona State University, Tempe, AZ, 85287-1604, USA
| | - Nirupa Nagaratnam
- School of Molecular Sciences and Biodesign Center for Applied Structural Discovery, Arizona State University, Tempe, AZ, 85287-1604, USA
| | - James Zook
- School of Molecular Sciences and Biodesign Center for Applied Structural Discovery, Arizona State University, Tempe, AZ, 85287-1604, USA
| | - Jacob Verburgt
- Physics Department, University of Wisconsin-Milwaukee, 3135 N. Maryland Ave, Milwaukee, WI, 53211, USA
- Milwaukee School of Engineering, Milwaukee, WI, 53202-3109, USA
| | - Tyler Norwood
- Physics Department, University of Wisconsin-Milwaukee, 3135 N. Maryland Ave, Milwaukee, WI, 53211, USA
| | - Ishwor Poudyal
- Physics Department, University of Wisconsin-Milwaukee, 3135 N. Maryland Ave, Milwaukee, WI, 53211, USA
| | - David Xu
- Department of BioSciences, Rice University, 6100 Main Street, Houston, TX, 77005, USA
| | - Jason Koglin
- Linac Coherent Light Source, Stanford Linear Accelerator Center (SLAC) National, Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA
| | - Matthew H Seaberg
- Linac Coherent Light Source, Stanford Linear Accelerator Center (SLAC) National, Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA
| | - Yun Zhao
- School of Molecular Sciences and Biodesign Center for Applied Structural Discovery, Arizona State University, Tempe, AZ, 85287-1604, USA
| | - Saša Bajt
- Photon Science, DESY, Notkestrasse 85, 22607, Hamburg, Germany
| | - Thomas Grant
- University of New York Buffalo, Hauptman-Woodward Institute, 700 Ellicott St, Buffalo, NY, 14203, USA
| | - Valerio Mariani
- Center for Free-Electron Laser Science, DESY, Notkestrasse 85, 22607, Hamburg, Germany
| | - Garrett Nelson
- Department of Physics, Arizona State University, Tempe, AZ, 85287, USA
| | | | - Euiyoung Bae
- Department of Agricultural Biotechnology, Seoul National University, Seoul, 08826, Korea
| | - Raimund Fromme
- School of Molecular Sciences and Biodesign Center for Applied Structural Discovery, Arizona State University, Tempe, AZ, 85287-1604, USA
| | - Russell Fung
- Physics Department, University of Wisconsin-Milwaukee, 3135 N. Maryland Ave, Milwaukee, WI, 53211, USA
| | - Peter Schwander
- Physics Department, University of Wisconsin-Milwaukee, 3135 N. Maryland Ave, Milwaukee, WI, 53211, USA
| | - Matthias Frank
- Lawrence Livermore National Laboratory, Livermore, CA, 94550, USA
| | - Thomas A White
- Center for Free-Electron Laser Science, DESY, Notkestrasse 85, 22607, Hamburg, Germany
| | - Uwe Weierstall
- Department of Physics, Arizona State University, Tempe, AZ, 85287, USA
| | - Nadia Zatsepin
- Department of Physics, Arizona State University, Tempe, AZ, 85287, USA
| | - John Spence
- Department of Physics, Arizona State University, Tempe, AZ, 85287, USA
| | - Petra Fromme
- School of Molecular Sciences and Biodesign Center for Applied Structural Discovery, Arizona State University, Tempe, AZ, 85287-1604, USA
| | - Henry N Chapman
- Center for Free-Electron Laser Science, DESY, Notkestrasse 85, 22607, Hamburg, Germany
- University of Hamburg, Luruper Chaussee 149, 22761, Hamburg, Germany
- Centre for Ultrafast Imaging, Luruper Chaussee 149, 22761, Hamburg, Germany
| | - Lois Pollack
- School of Applied and Engineering Physics, Cornell University, 254 Clark Hall, Ithaca, NY, 14853, USA
| | - Lee Tremblay
- 4Marbles Inc., 1900 Belvedere Pl, Westfield, IN, 46074, USA
- GlaxoSmithKline, Gunnels Wood Road, Stevenage, SG1 2NY, UK
| | - Abbas Ourmazd
- Physics Department, University of Wisconsin-Milwaukee, 3135 N. Maryland Ave, Milwaukee, WI, 53211, USA
| | - George N Phillips
- Department of BioSciences, Rice University, 6100 Main Street, Houston, TX, 77005, USA
| | - Marius Schmidt
- Physics Department, University of Wisconsin-Milwaukee, 3135 N. Maryland Ave, Milwaukee, WI, 53211, USA.
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13
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Šrajer V, Schmidt M. Watching Proteins Function with Time-resolved X-ray Crystallography. JOURNAL OF PHYSICS D: APPLIED PHYSICS 2017; 50:373001. [PMID: 29353938 PMCID: PMC5771432 DOI: 10.1088/1361-6463/aa7d32] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
Macromolecular crystallography was immensely successful in the last two decades. To a large degree this success resulted from use of powerful third generation synchrotron X-ray sources. An expansive database of more than 100,000 protein structures, of which many were determined at resolution better than 2 Å, is available today. With this achievement, the spotlight in structural biology is shifting from determination of static structures to elucidating dynamic aspects of protein function. A powerful tool for addressing these aspects is time-resolved crystallography, where a genuine biological function is triggered in the crystal with a goal of capturing molecules in action and determining protein kinetics and structures of intermediates (Schmidt et al., 2005a; Schmidt 2008; Neutze and Moffat, 2012; Šrajer 2014). In this approach, short and intense X-ray pulses are used to probe intermediates in real time and at room temperature, in an ongoing reaction that is initiated synchronously and rapidly in the crystal. Time-resolved macromolecular crystallography with 100 ps time resolution at synchrotron X-ray sources is in its mature phase today, particularly for studies of reversible, light-initiated reactions. The advent of the new free electron lasers for hard X-rays (XFELs; 5-20 keV), which provide exceptionally intense, femtosecond X-ray pulses, marks a new frontier for time-resolved crystallography. The exploration of ultra-fast events becomes possible in high-resolution structural detail, on sub-picosecond time scales (Tenboer et al., 2014; Barends et al., 2015; Pande et al., 2016). We review here state-of-the-art time-resolved crystallographic experiments both at synchrotrons and XFELs. We also outline challenges and further developments necessary to broaden the application of these methods to many important proteins and enzymes of biomedical relevance.
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Affiliation(s)
- Vukica Šrajer
- Center for Advanced Radiation Sources, The University of Chicago, Chicago, IL, USA
| | - Marius Schmidt
- Physics Department, University of Wisconsin-Milwaukee, Milwaukee, IL, USA
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14
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Pérez S, de Sanctis D. Glycoscience@Synchrotron: Synchrotron radiation applied to structural glycoscience. Beilstein J Org Chem 2017; 13:1145-1167. [PMID: 28684994 PMCID: PMC5480326 DOI: 10.3762/bjoc.13.114] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2017] [Accepted: 05/17/2017] [Indexed: 11/29/2022] Open
Abstract
Synchrotron radiation is the most versatile way to explore biological materials in different states: monocrystalline, polycrystalline, solution, colloids and multiscale architectures. Steady improvements in instrumentation have made synchrotrons the most flexible intense X-ray source. The wide range of applications of synchrotron radiation is commensurate with the structural diversity and complexity of the molecules and macromolecules that form the collection of substrates investigated by glycoscience. The present review illustrates how synchrotron-based experiments have contributed to our understanding in the field of structural glycobiology. Structural characterization of protein–carbohydrate interactions of the families of most glycan-interacting proteins (including glycosyl transferases and hydrolases, lectins, antibodies and GAG-binding proteins) are presented. Examples concerned with glycolipids and colloids are also covered as well as some dealing with the structures and multiscale architectures of polysaccharides. Insights into the kinetics of catalytic events observed in the crystalline state are also presented as well as some aspects of structure determination of protein in solution.
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Affiliation(s)
- Serge Pérez
- Department of Molecular Pharmacochemistry, CNRS-University Grenoble Alpes, France
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15
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Bourgeois D. Deciphering Structural Photophysics of Fluorescent Proteins by Kinetic Crystallography. Int J Mol Sci 2017; 18:ijms18061187. [PMID: 28574447 PMCID: PMC5486010 DOI: 10.3390/ijms18061187] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2017] [Revised: 05/24/2017] [Accepted: 05/26/2017] [Indexed: 01/02/2023] Open
Abstract
Because they enable labeling of biological samples in a genetically-encoded manner, Fluorescent Proteins (FPs) have revolutionized life sciences. Photo-transformable fluorescent proteins (PTFPs), in particular, recently attracted wide interest, as their fluorescence state can be actively modulated by light, a property central to the emergence of super-resolution microscopy. PTFPs, however, exhibit highly complex photophysical behaviours that are still poorly understood, hampering the rational engineering of variants with improved performances. We show that kinetic crystallography combined with in crystallo optical spectroscopy, modeling approaches and single-molecule measurements constitutes a powerful tool to decipher processes such as photoactivation, photoconversion, photoswitching, photoblinking and photobleaching. Besides potential applications for the design of enhanced PTFPs, these investigations provide fundamental insight into photoactivated protein dynamics.
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Affiliation(s)
- Dominique Bourgeois
- Institut de Biologie Structurale, Univ. Grenoble Alpes, CNRS, CEA, CNRS, IBS, F-38000 Grenoble, France.
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16
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Abstract
Time-resolved macromolecular crystallography unifies protein structure determination with chemical kinetics. With the advent of fourth generation X-ray sources the time-resolution can be on the order of 10-40 fs, which opens the ultrafast time scale to structure determination. Fundamental motions and transitions associated with chemical reactions in proteins can now be observed. Moreover, new experimental approaches at synchrotrons allow for the straightforward investigation of all kind of reactions in biological macromolecules. Here, recent developments in the field are reviewed.
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Affiliation(s)
- Marius Schmidt
- Kenwood Interdisciplinary Research Complex, Physics Department, University of Wisconsin-Milwaukee, Room 3087, 3135 North Maryland Avenue, Milwaukee, WI, 53211, USA.
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17
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Yorke BA, Beddard GS, Owen RL, Pearson AR. Time-resolved crystallography using the Hadamard transform. Nat Methods 2014; 11:1131-4. [PMID: 25282611 PMCID: PMC4216935 DOI: 10.1038/nmeth.3139] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2013] [Accepted: 09/04/2014] [Indexed: 11/08/2022]
Abstract
We describe a method for performing time-resolved X-ray crystallographic experiments based on the Hadamard transform, in which time resolution is defined by the underlying periodicity of the probe pulse sequence, and signal/noise is greatly improved over that for the fastest pump-probe experiments depending on a single pulse. This approach should be applicable on standard synchrotron beamlines and will enable high-resolution measurements of protein and small-molecule structural dynamics. It is also applicable to other time-resolved measurements where a probe can be encoded, such as pump-probe spectroscopy.
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Affiliation(s)
- Briony A Yorke
- Astbury Centre for Structural Molecular Biology, The University of Leeds, Leeds, UK
| | | | - Robin L Owen
- Diamond Light Source, Harwell Science and Innovation Campus, Didcot, UK
| | - Arwen R Pearson
- Astbury Centre for Structural Molecular Biology, The University of Leeds, Leeds, UK
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18
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Gorfman S. Sub-microsecond X-ray crystallography: techniques, challenges, and applications for materials science. CRYSTALLOGR REV 2014. [DOI: 10.1080/0889311x.2014.908353] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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19
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Warkentin M, Hopkins JB, Badeau R, Mulichak AM, Keefe LJ, Thorne RE. Global radiation damage: temperature dependence, time dependence and how to outrun it. JOURNAL OF SYNCHROTRON RADIATION 2013; 20:7-13. [PMID: 23254651 PMCID: PMC3526918 DOI: 10.1107/s0909049512048303] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/02/2012] [Accepted: 11/25/2012] [Indexed: 05/22/2023]
Abstract
A series of studies that provide a consistent and illuminating picture of global radiation damage to protein crystals, especially at temperatures above ∼200 K, are described. The radiation sensitivity shows a transition near 200 K, above which it appears to be limited by solvent-coupled diffusive processes. Consistent with this interpretation, a component of global damage proceeds on timescales of several minutes at 180 K, decreasing to seconds near room temperature. As a result, data collection times of order 1 s allow up to half of global damage to be outrun at 260 K. Much larger damage reductions near room temperature should be feasible using larger dose rates delivered using microfocused beams, enabling a significant expansion of structural studies of proteins under more nearly native conditions.
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Affiliation(s)
| | | | - Ryan Badeau
- Physics Department, Cornell University, Ithaca, NY 14853, USA
| | | | - Lisa J. Keefe
- IMCA-CAT, Argonne National Laboratory, Argonne, IL 60439, USA
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20
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Warkentin M, Badeau R, Hopkins JB, Thorne RE. Spatial distribution of radiation damage to crystalline proteins at 25-300 K. ACTA CRYSTALLOGRAPHICA. SECTION D, BIOLOGICAL CRYSTALLOGRAPHY 2012; 68:1108-17. [PMID: 22948911 PMCID: PMC3489100 DOI: 10.1107/s0907444912021361] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/02/2012] [Accepted: 05/10/2012] [Indexed: 11/11/2022]
Abstract
The spatial distribution of radiation damage (assayed by increases in atomic B factors) to thaumatin and urease crystals at temperatures ranging from 25 to 300 K is reported. The nature of the damage changes dramatically at approximately 180 K. Above this temperature the role of solvent diffusion is apparent in thaumatin crystals, as solvent-exposed turns and loops are especially sensitive. In urease, a flap covering the active site is the most sensitive part of the molecule and nearby loops show enhanced sensitivity. Below 180 K sensitivity is correlated with poor local packing, especially in thaumatin. At all temperatures, the component of the damage that is spatially uniform within the unit cell accounts for more than half of the total increase in the atomic B factors and correlates with changes in mosaicity. This component may arise from lattice-level, rather than local, disorder. The effects of primary structure on radiation sensitivity are small compared with those of tertiary structure, local packing, solvent accessibility and crystal contacts.
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Affiliation(s)
| | - Ryan Badeau
- Physics Department, Cornell University, Ithaca, NY 14853, USA
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Warkentin M, Badeau R, Hopkins JB, Mulichak AM, Keefe LJ, Thorne RE. Global radiation damage at 300 and 260 K with dose rates approaching 1 MGy s⁻¹. ACTA CRYSTALLOGRAPHICA SECTION D: BIOLOGICAL CRYSTALLOGRAPHY 2012; 68:124-33. [PMID: 22281741 DOI: 10.1107/s0907444911052085] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/08/2011] [Accepted: 12/02/2011] [Indexed: 11/10/2022]
Abstract
Global radiation damage to 19 thaumatin crystals has been measured using dose rates from 3 to 680 kGy s⁻¹. At room temperature damage per unit dose appears to be roughly independent of dose rate, suggesting that the timescales for important damage processes are less than ∼1 s. However, at T = 260 K approximately half of the global damage manifested at dose rates of ∼10 kGy s⁻¹ can be outrun by collecting data at 680 kGy s⁻¹. Appreciable sample-to-sample variability in global radiation sensitivity at fixed dose rate is observed. This variability cannot be accounted for by errors in dose calculation, crystal slippage or the size of the data sets in the assay.
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Kostov KS, Moffat K. Cluster analysis of time-dependent crystallographic data: Direct identification of time-independent structural intermediates. Biophys J 2011; 100:440-9. [PMID: 21244840 DOI: 10.1016/j.bpj.2010.10.053] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2010] [Revised: 10/15/2010] [Accepted: 10/19/2010] [Indexed: 10/18/2022] Open
Abstract
The initial output of a time-resolved macromolecular crystallography experiment is a time-dependent series of difference electron density maps that displays the time-dependent changes in underlying structure as a reaction progresses. The goal is to interpret such data in terms of a small number of crystallographically refinable, time-independent structures, each associated with a reaction intermediate; to establish the pathways and rate coefficients by which these intermediates interconvert; and thereby to elucidate a chemical kinetic mechanism. One strategy toward achieving this goal is to use cluster analysis, a statistical method that groups objects based on their similarity. If the difference electron density at a particular voxel in the time-dependent difference electron density (TDED) maps is sensitive to the presence of one and only one intermediate, then its temporal evolution will exactly parallel the concentration profile of that intermediate with time. The rationale is therefore to cluster voxels with respect to the shapes of their TDEDs, so that each group or cluster of voxels corresponds to one structural intermediate. Clusters of voxels whose TDEDs reflect the presence of two or more specific intermediates can also be identified. From such groupings one can then infer the number of intermediates, obtain their time-independent difference density characteristics, and refine the structure of each intermediate. We review the principles of cluster analysis and clustering algorithms in a crystallographic context, and describe the application of the method to simulated and experimental time-resolved crystallographic data for the photocycle of photoactive yellow protein.
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Affiliation(s)
- Konstantin S Kostov
- Department of Biochemistry and Molecular Biology, Institute for Biophysical Dynamics, University of Chicago, Illinois, USA.
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23
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Sage JT, Zhang Y, McGeehan J, Ravelli RBG, Weik M, van Thor JJ. Infrared protein crystallography. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2011; 1814:760-77. [PMID: 21376143 DOI: 10.1016/j.bbapap.2011.02.012] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2010] [Revised: 02/22/2011] [Accepted: 02/23/2011] [Indexed: 11/19/2022]
Abstract
We consider the application of infrared spectroscopy to protein crystals, with particular emphasis on exploiting molecular orientation through polarization measurements on oriented single crystals. Infrared microscopes enable transmission measurements on individual crystals using either thermal or nonthermal sources, and can accommodate flow cells, used to measure spectral changes induced by exposure to soluble ligands, and cryostreams, used for measurements of flash-cooled crystals. Comparison of unpolarized infrared measurements on crystals and solutions probes the effects of crystallization and can enhance the value of the structural models refined from X-ray diffraction data by establishing solution conditions under which they are most relevant. Results on several proteins are consistent with similar equilibrium conformational distributions in crystal and solutions. However, the rates of conformational change are often perturbed. Infrared measurements also detect products generated by X-ray exposure, including CO(2). Crystals with favorable symmetry exhibit infrared dichroism that enhances the synergy with X-ray crystallography. Polarized infrared measurements on crystals can distinguish spectral contributions from chemically similar sites, identify hydrogen bonding partners, and, in opportune situations, determine three-dimensional orientations of molecular groups. This article is part of a Special Issue entitled: Protein Structure and Function in the Crystalline State.
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Affiliation(s)
- J Timothy Sage
- Department of Physics and Center for Interdisciplinary Research on Complex Systems, Northeastern University, Boston, MA 02115, USA.
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24
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Weik M, Colletier JP. Temperature-dependent macromolecular X-ray crystallography. ACTA CRYSTALLOGRAPHICA SECTION D: BIOLOGICAL CRYSTALLOGRAPHY 2010; 66:437-46. [PMID: 20382997 PMCID: PMC2852308 DOI: 10.1107/s0907444910002702] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/09/2009] [Accepted: 01/21/2010] [Indexed: 11/10/2022]
Abstract
X-ray crystallography provides structural details of biological macromolecules. Whereas routine data are collected close to 100 K in order to mitigate radiation damage, more exotic temperature-controlled experiments in a broader temperature range from 15 K to room temperature can provide both dynamical and structural insights. Here, the dynamical behaviour of crystalline macromolecules and their surrounding solvent as a function of cryo-temperature is reviewed. Experimental strategies of kinetic crystallography are discussed that have allowed the generation and trapping of macromolecular intermediate states by combining reaction initiation in the crystalline state with appropriate temperature profiles. A particular focus is on recruiting X-ray-induced changes for reaction initiation, thus unveiling useful aspects of radiation damage, which otherwise has to be minimized in macromolecular crystallography.
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Affiliation(s)
- Martin Weik
- CEA, IBS, Laboratoire de Biophysique Moléculaire, F-38054 Grenoble, France.
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25
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