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13 items found (0 items not approved), displaying 1 to 10.[First/Prev] 1, 2 [Next/Last]

Instruments / Technical Area	Publication Details	Published
	Untangling the sequence of events during the S 2 → S 3 transition in photosystem II and implications for the water oxidation mechanism Mohamed Ibrahim , Thomas Fransson , Ruchira Chatterjee , Mun Hon Cheah , Rana Hussein , Louise Lassalle , Kyle D. Sutherlin , Iris D. Young , Franklin D. Fuller , Sheraz Gul , In-sik Kim , Philipp S. Simon , Casper De Lichtenberg , Petko Chernev , Isabel Bogacz , Cindy C. Pham , Allen M. Orville , Nicholas Saichek , Trent Northen , Alexander Batyuk , Sergio Carbajo , Roberto Alonso-mori , Kensuke Tono , Shigeki Owada , Asmit Bhowmick , Robert Bolotovsky , Derek Mendez , Nigel W. Moriarty , James M. Holton , Holger Dobbek , Aaron S. Brewster , Paul D. Adams , Nicholas K. Sauter , Uwe Bergmann , Athina Zouni , Johannes Messinger , Jan Kern , Vittal K. Yachandra , Junko Yano Proceedings Of The National Academy Of Sciences 766 DOI: 10.1073/pnas.2000529117 Open Access Show Abstract ▼ Abstract: In oxygenic photosynthesis, light-driven oxidation of water to molecular oxygen is carried out by the oxygen-evolving complex (OEC) in photosystem II (PS II). Recently, we reported the room-temperature structures of PS II in the four (semi)stable S-states, S1, S2, S3, and S0, showing that a water molecule is inserted during the S2 → S3 transition, as a new bridging O(H)-ligand between Mn1 and Ca. To understand the sequence of events leading to the formation of this last stable intermediate state before O2 formation, we recorded diffraction and Mn X-ray emission spectroscopy (XES) data at several time points during the S2 → S3 transition. At the electron acceptor site, changes due to the two-electron redox chemistry at the quinones, QA and QB, are observed. At the donor site, tyrosine YZ and His190 H-bonded to it move by 50 µs after the second flash, and Glu189 moves away from Ca. This is followed by Mn1 and Mn4 moving apart, and the insertion of OX(H) at the open coordination site of Mn1. This water, possibly a ligand of Ca, could be supplied via a “water wheel”-like arrangement of five waters next to the OEC that is connected by a large channel to the bulk solvent. XES spectra show that Mn oxidation (τ of ∼350 µs) during the S2 → S3 transition mirrors the appearance of OX electron density. This indicates that the oxidation state change and the insertion of water as a bridging atom between Mn1 and Ca are highly correlated.	May 2020
I04-Macromolecular Crystallography I24-Microfocus Macromolecular Crystallography VMXi-Versatile Macromolecular Crystallography in situ	Molecular basis for GTP recognition by light‐activated guanylate cyclase RhGC Agata Butryn , Hadeeqa Raza , Heather Rada , Isabel Moraes , Raymond J. Owens , Allen M. Orville The Febs Journal DOI: 10.1111/febs.15167 Diamond Proposal Number(s): [16818, 19737, 19485] Open Access Show Abstract ▼ Abstract: Cyclic guanosine 3′,5′‐monophosphate (cGMP) is an intracellular signaling molecule involved in many sensory and developmental processes. Synthesis of cGMP from GTP is catalyzed by guanylate cyclase (GC) in a reaction analogous to cAMP formation by adenylate cyclase (AC). Although detailed structural information is available on the catalytic region of nucleotidyl cyclases (NCs) in various states, these atomic models do not provide a sufficient explanation for the substrate selectivity between GC and AC family members. Detailed structural information on the GC domain in its active conformation is largely missing and no crystal structure of a GTP‐bound wild‐type GC domain has been published to date. Here, we describe the crystal structure of the catalytic domain of rhodopsin‐GC (RhGC) from Catenaria anguillulae in complex with GTP at 1.7 Å resolution. Our study reveals the organization of a eukaryotic GC domain in its active conformation. We observe that the binding mode of the substrate GTP is similar to that of AC–ATP interaction, although surprisingly not all of the interactions predicted to be responsible for base recognition are present. The structure provides insights into potential mechanisms of substrate discrimination and activity regulation that may be common to all class III purine NCs.	Dec 2019
I24-Microfocus Macromolecular Crystallography	Photoreversible interconversion of a phytochrome photosensory module in the crystalline state E. Sethe Burgie , Jonathan A. Clinger , Mitchell D. Miller , Aaron S. Brewster , Pierre Aller , Agata Butryn , Franklin D. Fuller , Sheraz Gul , Iris D. Young , Cindy C. Pham , In-sik Kim , Asmit Bhowmick , Lee J. O’riordan , Kyle D. Sutherlin , Joshua V. Heinemann , Alexander Batyuk , Roberto Alonso-mori , Mark S. Hunter , Jason E. Koglin , Junko Yano , Vittal K. Yachandra , Nicholas K. Sauter , Aina E. Cohen , Jan Kern , Allen M. Orville , George N. Phillips , Richard D. Vierstra Proceedings Of The National Academy Of Sciences 37 DOI: 10.1073/pnas.1912041116 Diamond Proposal Number(s): [19458] Open Access Show Abstract ▼ Abstract: A major barrier to defining the structural intermediates that arise during the reversible photointerconversion of phytochromes between their biologically inactive and active states has been the lack of crystals that faithfully undergo this transition within the crystal lattice. Here, we describe a crystalline form of the cyclic GMP phosphodiesterases/adenylyl cyclase/FhlA (GAF) domain from the cyanobacteriochrome PixJ in Thermosynechococcus elongatus assembled with phycocyanobilin that permits reversible photoconversion between the blue light-absorbing Pb and green light-absorbing Pg states, as well as thermal reversion of Pg back to Pb. The X-ray crystallographic structure of Pb matches previous models, including autocatalytic conversion of phycocyanobilin to phycoviolobilin upon binding and its tandem thioether linkage to the GAF domain. Cryocrystallography at 150 K, which compared diffraction data from a single crystal as Pb or after irradiation with blue light, detected photoconversion product(s) based on Fobs − Fobs difference maps that were consistent with rotation of the bonds connecting pyrrole rings C and D. Further spectroscopic analyses showed that phycoviolobilin is susceptible to X-ray radiation damage, especially as Pg, during single-crystal X-ray diffraction analyses, which could complicate fine mapping of the various intermediate states. Fortunately, we found that PixJ crystals are amenable to serial femtosecond crystallography (SFX) analyses using X-ray free-electron lasers (XFELs). As proof of principle, we solved by room temperature SFX the GAF domain structure of Pb to 1.55-Å resolution, which was strongly congruent with synchrotron-based models. Analysis of these crystals by SFX should now enable structural characterization of the early events that drive phytochrome photoconversion.	Dec 2019
I24-Microfocus Macromolecular Crystallography	Reducing sample consumption for serial crystallography using acoustic drop ejection Bradley Davy , Danny Axford , John H. Beale , Agata Butryn , Peter Docker , Ali Ebrahim , Gabriel Leen , Allen M. Orville , Robin L. Owen , Pierre Aller Journal Of Synchrotron Radiation 26 DOI: 10.1107/S1600577519009329 Diamond Proposal Number(s): [14493, 19458] Open Access Show Abstract ▼ Abstract: Efficient sample delivery is an essential aspect of serial crystallography at both synchrotrons and X-ray free-electron lasers. Rastering fixed target chips through the X-ray beam is an efficient method for serial delivery from the perspectives of both sample consumption and beam time usage. Here, an approach for loading fixed targets using acoustic drop ejection is presented that does not compromise crystal quality, can reduce sample consumption by more than an order of magnitude and allows serial diffraction to be collected from a larger proportion of the crystals in the slurry.	Sep 2019
	Structures of the intermediates of Kok’s photosynthetic water oxidation clock Jan Kern , Ruchira Chatterjee , Iris D. Young , Franklin D. Fuller , Louise Lassalle , Mohamed Ibrahim , Sheraz Gul , Thomas Fransson , Aaron S. Brewster , Roberto Alonso-mori , Rana Hussein , Miao Zhang , Lacey Douthit , Casper De Lichtenberg , Mun Hon Cheah , Dmitry Shevela , Julia Wersig , Ina Seuffert , Dimosthenis Sokaras , Ernest Pastor , Clemens Weninger , Thomas Kroll , Raymond G. Sierra , Pierre Aller , Agata Butryn , Allen M. Orville , Mengning Liang , Alexander Batyuk , Jason E. Koglin , Sergio Carbajo , Sébastien Boutet , Nigel W. Moriarty , James M. Holton , Holger Dobbek , Paul D. Adams , Uwe Bergmann , Nicholas K. Sauter , Athina Zouni , Johannes Messinger , Junko Yano , Vittal K. Yachandra Nature 11 DOI: 10.1038/s41586-018-0681-2 Show Abstract ▼ Abstract: Inspired by the period-four oscillation in flash-induced oxygen evolution of photosystem II discovered by Joliot in 1969, Kok performed additional experiments and proposed a five-state kinetic model for photosynthetic oxygen evolution, known as Kok’s S-state clock or cycle1,2. The model comprises four (meta)stable intermediates (S0, S1, S2 and S3) and one transient S4 state, which precedes dioxygen formation occurring in a concerted reaction from two water-derived oxygens bound at an oxo-bridged tetra manganese calcium (Mn4CaO5) cluster in the oxygen-evolving complex3,4,5,6,7. This reaction is coupled to the two-step reduction and protonation of the mobile plastoquinone QB at the acceptor side of PSII. Here, using serial femtosecond X-ray crystallography and simultaneous X-ray emission spectroscopy with multi-flash visible laser excitation at room temperature, we visualize all (meta)stable states of Kok’s cycle as high-resolution structures (2.04–2.08 Å). In addition, we report structures of two transient states at 150 and 400 µs, revealing notable structural changes including the binding of one additional ‘water’, Ox, during the S2→S3 state transition. Our results suggest that one water ligand to calcium (W3) is directly involved in substrate delivery. The binding of the additional oxygen Ox in the S3 state between Ca and Mn1 supports O–O bond formation mechanisms involving O5 as one substrate, where Ox is either the other substrate oxygen or is perfectly positioned to refill the O5 position during O2 release. Thus, our results exclude peroxo-bond formation in the S3 state, and the nucleophilic attack of W3 onto W2 is unlikely.	Nov 2018
I03-Macromolecular Crystallography	Megahertz serial crystallography Max O. Wiedorn , Dominik Oberthuer , Richard Bean , Robin Schubert , Nadine Werner , Brian Abbey , Martin Aepfelbacher , Luigi Adriano , Aschkan Allahgholi , Nasser Al-qudami , Jakob Andreasson , Steve Aplin , Salah Awel , Kartik Ayyer , Saša Bajt , Imrich Barák , Sadia Bari , Johan Bielecki , Sabine Botha , Djelloul Boukhelef , Wolfgang Brehm , Sandor Brockhauser , Igor Cheviakov , Matthew A. Coleman , Francisco Cruz-mazo , Cyril Danilevski , Connie Darmanin , R. Bruce Doak , Martin Domaracky , Katerina Dörner , Yang Du , Hans Fangohr , Holger Fleckenstein , Matthias Frank , Petra Fromme , Alfonso M. Gañán-calvo , Yaroslav Gevorkov , Klaus Giewekemeyer , Helen Mary Ginn , Heinz Graafsma , Rita Graceffa , Dominic Greiffenberg , Lars Gumprecht , Peter Göttlicher , Janos Hajdu , Steffen Hauf , Michael Heymann , Susannah Holmes , Daniel A. Horke , Mark S. Hunter , Siegfried Imlau , Alexander Kaukher , Yoonhee Kim , Alexander Klyuev , Juraj Knoška , Bostjan Kobe , Manuela Kuhn , Christopher Kupitz , Jochen Küpper , Janine Mia Lahey-rudolph , Torsten Laurus , Karoline Le Cong , Romain Letrun , P. Lourdu Xavier , Luis Maia , Filipe R. N. C. Maia , Valerio Mariani , Marc Messerschmidt , Markus Metz , Davide Mezza , Thomas Michelat , Grant Mills , Diana C. F. Monteiro , Andrew Morgan , Kerstin Mühlig , Anna Munke , Astrid Münnich , Julia Nette , Keith A. Nugent , Theresa Nuguid , Allen M. Orville , Suraj Pandey , Gisel Pena , Pablo Villanueva-perez , Jennifer Poehlsen , Gianpietro Previtali , Lars Redecke , Winnie Maria Riekehr , Holger Rohde , Adam Round , Tatiana Safenreiter , Iosifina Sarrou , Tokushi Sato , Marius Schmidt , Bernd Schmitt , Robert Schönherr , Joachim Schulz , Jonas A. Sellberg , M. Marvin Seibert , Carolin Seuring , Megan L. Shelby , Robert L. Shoeman , Marcin Sikorski , Alessandro Silenzi , Claudiu A. Stan , Xintian Shi , Stephan Stern , Jola Sztuk-dambietz , Janusz Szuba , Aleksandra Tolstikova , Martin Trebbin , Ulrich Trunk , Patrik Vagovic , Thomas Ve , Britta Weinhausen , Thomas A. White , Krzysztof Wrona , Chen Xu , Oleksandr Yefanov , Nadia Zatsepin , Jiaguo Zhang , Markus Perbandt , Adrian P. Mancuso , Christian Betzel , Henry Chapman , Anton Barty Nature Communications 9 DOI: 10.1038/s41467-018-06156-7 Open Access Show Abstract ▼ Abstract: The new European X-ray Free-Electron Laser is the first X-ray free-electron laser capable of delivering X-ray pulses with a megahertz inter-pulse spacing, more than four orders of magnitude higher than previously possible. However, to date, it has been unclear whether it would indeed be possible to measure high-quality diffraction data at megahertz pulse repetition rates. Here, we show that high-quality structures can indeed be obtained using currently available operating conditions at the European XFEL. We present two complete data sets, one from the well-known model system lysozyme and the other from a so far unknown complex of a β-lactamase from K. pneumoniae involved in antibiotic resistance. This result opens up megahertz serial femtosecond crystallography (SFX) as a tool for reliable structure determination, substrate screening and the efficient measurement of the evolution and dynamics of molecular structures using megahertz repetition rate pulses available at this new class of X-ray laser source.	Oct 2018
	Entering an era of dynamic structural biology… Allen M. Orville Bmc Biology 16 DOI: 10.1186/s12915-018-0533-4 Open Access Show Abstract ▼ Abstract: A recent paper in BMC Biology presents a general method for mix-and-inject serial crystallography, to facilitate the visualization of enzyme intermediates via time-resolved serial femtosecond crystallography (tr-SFX). They apply their method to resolve in near atomic detail the cleavage and inactivation of the antibiotic ceftriaxone by a β-lactamase enzyme from Mycobacterium tuberculosis. Their work demonstrates the general applicability of time-resolved crystallography, from which dynamic structures, at atomic resolution, can be obtained.	May 2018
Accelerator Physics	Where is crystallography going? Jonathan M. Grimes , David R. Hall , Alun W. Ashton , Gwyndaf Evans , Robin L. Owen , Armin Wagner , Katherine E. Mcauley , Frank Von Delft , Allen M. Orville , Thomas Sorensen , Martin A. Walsh , Helen Ginn , David I. Stuart Acta Crystallographica Section D Structural Biology 74, 152 - 166 DOI: 10.1107/S2059798317016709 Open Access Show Abstract ▼ Abstract: Macromolecular crystallography (MX) has been a motor for biology for over half a century and this continues apace. A series of revolutions, including the production of recombinant proteins and cryo-crystallography, have meant that MX has repeatedly reinvented itself to dramatically increase its reach. Over the last 30 years synchrotron radiation has nucleated a succession of advances, ranging from detectors to optics and automation. These advances, in turn, open up opportunities. For instance, a further order of magnitude could perhaps be gained in signal to noise for general synchrotron experiments. In addition, X-ray free-electron lasers offer to capture fragments of reciprocal space without radiation damage, and open up the subpicosecond regime of protein dynamics and activity. But electrons have recently stolen the limelight: so is X-ray crystallography in rude health, or will imaging methods, especially single-particle electron microscopy, render it obsolete for the most interesting biology, whilst electron diffraction enables structure determination from even the smallest crystals? We will lay out some information to help you decide.	Feb 2018
I24-Microfocus Macromolecular Crystallography	An Acoustic On-Chip Goniometer for Room Temperature Macromolecular Crystallography C. G. Burton , Danny Axford , Andrew Michael John Edwards , Richard J. Gildea , Robert H. Morris , Michael I. Newton , Allen M. Orville , Mark Prince , Paul D. Topham , Peter D. Docker Lab On A Chip DOI: 10.1039/C7LC00812K Show Abstract ▼ Abstract: This paper describes the design, development and successful use of an on-chip goniometer for room-temperature macromolecular crystallography via acoustically induced rotations. We present for the first time a low cost, rate-tunable, acoustic actuator for randomised in-fluid sample orientation and its utilisation for protein structure determination on a synchrotron beamline. The device enables the efficient collection of diffraction data via a rotation method from a sample within a surface confined droplet. This method facillitates efficient macromolecular structural data acquisition in fluid environments for dynamical studies.	Nov 2017
Data acquisition	Pico-litre Sample Introduction and Acoustic Levitation Systems for Time Resolved Protein Crystallography Experiments at XFELS Peter Docker , Robert Morris , Michael Newton , Elizabeth Dye , James Kay , John Beale , Danny Axford , Allen Orville , Dave Stuart , Gabriel Leen Sensors & Transducers Journal 7, 39-45 Open Access Show Abstract ▼ Abstract: The system described in this work is a variant from traditional acoustic levitation first described by, Marzo et al. It uses multiple transducers eliminating the requirement for a mirror surface, allowing for an open geometry as the sound from multiple transducers combines to generate the acoustic trap which is configured to catch pico litres of crystal slurries. These acoustic traps also have the significant benefit of eliminating potential beam attenuation due to support structures or microfluidic devices. Additionally they meet the need to eliminate sample environments when experiments are carried out using an X-ray Free Electron Lasers (XFEL) such as the Linac Coherent Light Source (LCLS) as any sample environment would not survive the exposure to the X-Ray beam. XFELs generate Light a billion times brighter than the sun. The application for this system will be to examine turn over in Beta lactamase proteins which is responsible for bacteria developing antibiotic resistance and therefore of significant importance to future world health. The system will allow for diffraction data to be collected before and after turnover allowing for a better understanding of the underling processes. The authors first described this work at Nanotech 2017.	Jul 2017

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