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Wych DC, Wall ME. Molecular-dynamics simulations of macromolecular diffraction, part II: Analysis of protein crystal simulations. Methods Enzymol 2023; 688:115-143. [PMID: 37748824 DOI: 10.1016/bs.mie.2023.06.012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/27/2023]
Abstract
Molecular-dynamics (MD) simulations have contributed substantially to our understanding of protein structure and dynamics, yielding insights into many biological processes including protein folding, drug binding, and mechanisms of protein-protein interactions. Much of what is known about protein structure comes from macromolecular crystallography (MX) experiments. MD simulations of protein crystals are useful in the study of MX because the simulations can be analyzed to calculate almost any crystallographic observable of interest, from atomic coordinates to structure factors and densities, B-factors, multiple conformations and their populations/occupancies, and diffuse scattering intensities. Computing resources and software to support crystalline MD simulations are now readily available to many researchers studying protein structure and dynamics and who may be interested in advanced interpretation of MX data, including diffuse scattering. In this work, we outline methods of analyzing MD simulations of protein crystals and provide accompanying Jupyter notebooks as practical resources for researchers wishing to perform similar analyses on their own systems of interest.
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Affiliation(s)
- David C Wych
- Computer, Computational and Statistical Sciences Division, Los Alamos, NM, United States; Center for Nonlinear Studies, Los Alamos National Laboratory, Los Alamos, NM, United States
| | - Michael E Wall
- Computer, Computational and Statistical Sciences Division, Los Alamos, NM, United States.
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2
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Wych DC, Wall ME. Molecular-dynamics simulations of macromolecular diffraction, part I: Preparation of protein crystal simulations. Methods Enzymol 2023; 688:87-114. [PMID: 37748833 DOI: 10.1016/bs.mie.2023.06.008] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/27/2023]
Abstract
Molecular-dynamics (MD) simulations of protein crystals enable the prediction of structural and dynamical features of both the protein and the solvent components of macromolecular crystals, which can be validated against diffraction data from X-ray crystallographic experiments. The simulations have been useful for studying and predicting both Bragg and diffuse scattering in protein crystallography; however, the preparation is not yet automated and includes choices and tradeoffs that can impact the results. Here we examine some of the intricacies and consequences of the choices involved in setting up MD simulations of protein crystals for the study of diffraction data, and provide a recipe for preparing the simulations, packaged in an accompanying Jupyter notebook. This article and the accompanying notebook are intended to serve as practical resources for researchers wishing to put these models to work.
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Affiliation(s)
- David C Wych
- Computer, Computational and Statistical Sciences Division, Los Alamos, NM, United States; Center for Nonlinear Studies, Los Alamos National Laboratory, Los Alamos, NM, United States
| | - Michael E Wall
- Computer, Computational and Statistical Sciences Division, Los Alamos, NM, United States.
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3
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Sharma S, Ebrahim A, Keedy DA. Room-temperature serial synchrotron crystallography of the human phosphatase PTP1B. Acta Crystallogr F Struct Biol Commun 2023; 79:23-30. [PMID: 36598353 PMCID: PMC9813971 DOI: 10.1107/s2053230x22011645] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2022] [Accepted: 12/04/2022] [Indexed: 12/24/2022] Open
Abstract
Room-temperature X-ray crystallography provides unique insights into protein conformational heterogeneity, but obtaining sufficiently large protein crystals is a common hurdle. Serial synchrotron crystallography (SSX) helps to address this hurdle by allowing the use of many medium- to small-sized crystals. Here, a recently introduced serial sample-support chip system has been used to obtain the first SSX structure of a human phosphatase, specifically protein tyrosine phosphatase 1B (PTP1B) in the unliganded (apo) state. In previous apo room-temperature structures, the active site and allosteric sites adopted alternate conformations, including open and closed conformations of the active-site WPD loop and of a distal allosteric site. By contrast, in our SSX structure the active site is best fitted with a single conformation, but the distal allosteric site is best fitted with alternate conformations. This observation argues for additional nuance in interpreting the nature of allosteric coupling in this protein. Overall, our results illustrate the promise of serial methods for room-temperature crystallography, as well as future avant-garde crystallography experiments, for PTP1B and other proteins.
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Affiliation(s)
- Shivani Sharma
- Structural Biology Initiative, CUNY Advanced Science Research Center, New York, NY 10031, USA,PhD Program in Biology, CUNY Graduate Center, New York, NY 10016, USA
| | - Ali Ebrahim
- Structural Biology Initiative, CUNY Advanced Science Research Center, New York, NY 10031, USA
| | - Daniel A. Keedy
- Structural Biology Initiative, CUNY Advanced Science Research Center, New York, NY 10031, USA,Department of Chemistry and Biochemistry, City College of New York, New York, NY 10031, USA,PhD Programs in Biochemistry, Biology and Chemistry, CUNY Graduate Center, New York, NY 10016, USA,Correspondence e-mail:
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4
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Thorne RE. Determining biomolecular structures near room temperature using X-ray crystallography: concepts, methods and future optimization. Acta Crystallogr D Struct Biol 2023; 79:78-94. [PMID: 36601809 PMCID: PMC9815097 DOI: 10.1107/s2059798322011652] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2022] [Accepted: 12/04/2022] [Indexed: 01/05/2023] Open
Abstract
For roughly two decades, cryocrystallography has been the overwhelmingly dominant method for determining high-resolution biomolecular structures. Competition from single-particle cryo-electron microscopy and micro-electron diffraction, increased interest in functionally relevant information that may be missing or corrupted in structures determined at cryogenic temperature, and interest in time-resolved studies of the biomolecular response to chemical and optical stimuli have driven renewed interest in data collection at room temperature and, more generally, at temperatures from the protein-solvent glass transition near 200 K to ∼350 K. Fischer has recently reviewed practical methods for room-temperature data collection and analysis [Fischer (2021), Q. Rev. Biophys. 54, e1]. Here, the key advantages and physical principles of, and methods for, crystallographic data collection at noncryogenic temperatures and some factors relevant to interpreting the resulting data are discussed. For room-temperature data collection to realize its potential within the structural biology toolkit, streamlined and standardized methods for delivering crystals prepared in the home laboratory to the synchrotron and for automated handling and data collection, similar to those for cryocrystallography, should be implemented.
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Affiliation(s)
- Robert E. Thorne
- Physics Department, Cornell University, Ithaca, NY 14853, USA
- MiTeGen LLC, PO Box 3867, Ithaca, NY 14850, USA
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5
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Yabukarski F, Doukov T, Mokhtari DA, Du S, Herschlag D. Evaluating the impact of X-ray damage on conformational heterogeneity in room-temperature (277 K) and cryo-cooled protein crystals. Acta Crystallogr D Struct Biol 2022; 78:945-963. [PMID: 35916220 PMCID: PMC9344472 DOI: 10.1107/s2059798322005939] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2022] [Accepted: 06/02/2022] [Indexed: 11/10/2022] Open
Abstract
Cryo-cooling has been nearly universally adopted to mitigate X-ray damage and facilitate crystal handling in protein X-ray crystallography. However, cryo X-ray crystallographic data provide an incomplete window into the ensemble of conformations that is at the heart of protein function and energetics. Room-temperature (RT) X-ray crystallography provides accurate ensemble information, and recent developments allow conformational heterogeneity (the experimental manifestation of ensembles) to be extracted from single-crystal data. Nevertheless, high sensitivity to X-ray damage at RT raises concerns about data reliability. To systematically address this critical issue, increasingly X-ray-damaged high-resolution data sets (1.02–1.52 Å resolution) were obtained from single proteinase K, thaumatin and lysozyme crystals at RT (277 K). In each case a modest increase in conformational heterogeneity with X-ray damage was observed. Merging data with different extents of damage (as is typically carried out) had negligible effects on conformational heterogeneity until the overall diffraction intensity decayed to ∼70% of its initial value. These effects were compared with X-ray damage effects in cryo-cooled crystals by carrying out an analogous analysis of increasingly damaged proteinase K cryo data sets (0.9–1.16 Å resolution). X-ray damage-associated heterogeneity changes were found that were not observed at RT. This property renders it difficult to distinguish real from artefactual conformations and to determine the conformational response to changes in temperature. The ability to acquire reliable heterogeneity information from single crystals at RT, together with recent advances in RT data collection at accessible synchrotron beamlines, provides a strong motivation for the widespread adoption of RT X-ray crystallography to obtain conformational ensemble information.
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6
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Reducing electron beam damage through alternative STEM scanning strategies, Part II: Attempt towards an empirical model describing the damage process. Ultramicroscopy 2022; 240:113568. [PMID: 35716488 DOI: 10.1016/j.ultramic.2022.113568] [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: 04/30/2021] [Revised: 09/28/2021] [Accepted: 06/03/2022] [Indexed: 11/22/2022]
Abstract
In this second part of a series we attempt to construct an empirical model that can mimick all experimental observations made regarding the role of an alternative interleaved scan pattern in STEM imaging on the beam damage in a specific zeolite sample. We make use of a 2D diffusion model that describes the dissipation of the deposited beam energy in the sequence of probe positions that are visited during the scan pattern. The diffusion process allows for the concept of trying to 'outrun' the beam damage by carefully tuning the dwell time and distance between consecutively visited probe positions. We add a non linear function to include a threshold effect and evaluate the accumulated damage in each part of the image as a function of scan pattern details. Together, these ingredients are able to describe qualitatively all aspects of the experimental data and provide us with a model that could guide a further optimisation towards even lower beam damage without lowering the applied electron dose. We deliberately remain vague on what is diffusing here which avoids introducing too many sample specific details. This provides hope that the model can be applied also in sample classes that were not yet studied in such great detail by adjusting higher level parameters: a sample dependent diffusion constant and damage threshold.
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Suzuki R, Baba S, Mizuno N, Hasegawa K, Koizumi H, Kojima K, Kumasaka T, Tachibana M. Radiation-induced defects in protein crystals observed by X-ray topography. ACTA CRYSTALLOGRAPHICA SECTION D STRUCTURAL BIOLOGY 2022; 78:196-203. [DOI: 10.1107/s205979832101281x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/11/2021] [Accepted: 12/01/2021] [Indexed: 11/10/2022]
Abstract
The characterization of crystal defects induced by irradiation, such as X-rays, charged particles and neutrons, is important for understanding radiation damage and the associated generation of defects. Radiation damage to protein crystals has been measured using various methods. Until now, these methods have focused on decreased diffraction intensity, volume expansion of unit cells and specific damage to side chains. Here, the direct observation of specific crystal defects, such as dislocations, induced by X-ray irradiation of protein crystals at room temperature is reported. Dislocations are induced even by low absorbed doses of X-ray irradiation. This study revealed that for the same total absorbed dose, the formation of defects appears to critically depend on the dose rate. The relationship between dislocation energy and dose energy was analyzed based on dislocation theory associated with elasticity theory for crystalline materials. This demonstration of the crystal defects induced by X-ray irradiation could help to understand the underlying mechanisms of X-ray-induced radiation damage.
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Elbaum M, Seifer S, Houben L, Wolf SG, Rez P. Toward Compositional Contrast by Cryo-STEM. Acc Chem Res 2021; 54:3621-3631. [PMID: 34491730 DOI: 10.1021/acs.accounts.1c00279] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Electron microscopy (EM) is the most versatile tool for the study of matter at scales ranging from subatomic to visible. The high vacuum environment and the charged irradiation require careful stabilization of many specimens of interest. Biological samples are particularly sensitive due to their composition of light elements suspended in an aqueous medium. Early investigators developed techniques of embedding and staining with heavy metal salts for contrast enhancement. Indeed, the Nobel Prize in 1974 recognized Claude, de Duve, and Palade for establishment of the field of cell biology, largely due to their developments in separation and preservation of cellular components for electron microscopy. A decade later, cryogenic fixation was introduced. Vitrification of the water avoids the need for dehydration and provides an ideal matrix in which the organic macromolecules are suspended; the specimen represents a native state, suddenly frozen in time at temperatures below -150 °C. The low temperature maintains a low vapor pressure for the electron microscope, and the amorphous nature of the medium avoids diffraction contrast from crystalline ice. Such samples are extremely delicate, however, and cryo-EM imaging is a race for information in the face of ongoing damage by electron irradiation. Through this journey, cryo-EM enhanced the resolution scale from membranes to molecules and most recently to atoms. Cryo-EM pioneers, Dubochet, Frank, and Henderson, were awarded the Nobel Prize in 2017 for high resolution structure determination of biological macromolecules.A relatively untapped feature of cryo-EM is its preservation of composition. Nothing is added and nothing removed. Analytical spectroscopies based on electron energy loss or X-ray emission can be applied, but the very small interaction cross sections conflict with the weak exposures required to preserve sample integrity. To what extent can we interpret quantitatively the pixel intensities in images themselves? Conventional cryo-transmission electron microscopy (TEM) is limited in this respect, due to the strong dependence of the contrast transfer on defocus and the absence of contrast at low spatial frequencies.Inspiration comes largely from a different modality for cryo-tomography, using soft X-rays. Contrast depends on the difference in atomic absorption between carbon and oxygen in a region of the spectrum between their core level ionization energies, the so-called water window. Three dimensional (3D) reconstruction provides a map of the local X-ray absorption coefficient. The quantitative contrast enables the visualization of organic materials without stain and measurement of their concentration quantitatively. We asked, what aspects of the quantitative contrast might be transferred to cryo-electron microscopy?Compositional contrast is accessible in scanning transmission EM (STEM) via incoherent elastic scattering, which is sensitive to the atomic number Z. STEM can be regarded as a high energy, low angle diffraction measurement performed pixel by pixel with a weakly convergent beam. When coherent diffraction effects are absent, that is, in amorphous materials, a dark field signal measures quantitatively the flux scattered from the specimen integrated over the detector area. Learning to interpret these signals will open a new dimension in cryo-EM. This Account describes our efforts so far to introduce STEM for cryo-EM and tomography of biological specimens. We conclude with some thoughts on further developments.
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Affiliation(s)
| | | | | | | | - Peter Rez
- Department of Physics, Arizona State University, 550 E Tyler Drive, Tempe, Arizona 85287, United States
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Civera M, Moroni E, Sorrentino L, Vasile F, Sattin S. Chemical and Biophysical Approaches to Allosteric Modulation. European J Org Chem 2021. [DOI: 10.1002/ejoc.202100506] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Monica Civera
- Department of Chemistry Università degli Studi di Milano via C. Golgi, 19 20133 Milan Italy
| | - Elisabetta Moroni
- Istituto di Scienze e Tecnologie Chimiche Giulio Natta, SCITEC Via Mario Bianco 9 20131 Milan Italy
| | - Luca Sorrentino
- Department of Chemistry Università degli Studi di Milano via C. Golgi, 19 20133 Milan Italy
| | - Francesca Vasile
- Department of Chemistry Università degli Studi di Milano via C. Golgi, 19 20133 Milan Italy
| | - Sara Sattin
- Department of Chemistry Università degli Studi di Milano via C. Golgi, 19 20133 Milan Italy
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10
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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: 4] [Impact Index Per Article: 1.3] [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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11
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Schneider DK, Shi W, Andi B, Jakoncic J, Gao Y, Bhogadi DK, Myers SF, Martins B, Skinner JM, Aishima J, Qian K, Bernstein HJ, Lazo EO, Langdon T, Lara J, Shea-McCarthy G, Idir M, Huang L, Chubar O, Sweet RM, Berman LE, McSweeney S, Fuchs MR. FMX - the Frontier Microfocusing Macromolecular Crystallography Beamline at the National Synchrotron Light Source II. JOURNAL OF SYNCHROTRON RADIATION 2021; 28:650-665. [PMID: 33650577 PMCID: PMC7941291 DOI: 10.1107/s1600577520016173] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2020] [Accepted: 12/11/2020] [Indexed: 05/26/2023]
Abstract
Two new macromolecular crystallography (MX) beamlines at the National Synchrotron Light Source II, FMX and AMX, opened for general user operation in February 2017 [Schneider et al. (2013). J. Phys. Conf. Ser. 425, 012003; Fuchs et al. (2014). J. Phys. Conf. Ser. 493, 012021; Fuchs et al. (2016). AIP Conf. Proc. SRI2015, 1741, 030006]. FMX, the micro-focusing Frontier MX beamline in sector 17-ID-2 at NSLS-II, covers a 5-30 keV photon energy range and delivers a flux of 4.0 × 1012 photons s-1 at 1 Å into a 1 µm × 1.5 µm to 10 µm × 10 µm (V × H) variable focus, expected to reach 5 × 1012 photons s-1 at final storage-ring current. This flux density surpasses most MX beamlines by nearly two orders of magnitude. The high brightness and microbeam capability of FMX are focused on solving difficult crystallographic challenges. The beamline's flexible design supports a wide range of structure determination methods - serial crystallography on micrometre-sized crystals, raster optimization of diffraction from inhomogeneous crystals, high-resolution data collection from large-unit-cell crystals, room-temperature data collection for crystals that are difficult to freeze and for studying conformational dynamics, and fully automated data collection for sample-screening and ligand-binding studies. FMX's high dose rate reduces data collection times for applications like serial crystallography to minutes rather than hours. With associated sample lifetimes as short as a few milliseconds, new rapid sample-delivery methods have been implemented, such as an ultra-high-speed high-precision piezo scanner goniometer [Gao et al. (2018). J. Synchrotron Rad. 25, 1362-1370], new microcrystal-optimized micromesh well sample holders [Guo et al. (2018). IUCrJ, 5, 238-246] and highly viscous media injectors [Weierstall et al. (2014). Nat. Commun. 5, 3309]. The new beamline pushes the frontier of synchrotron crystallography and enables users to determine structures from difficult-to-crystallize targets like membrane proteins, using previously intractable crystals of a few micrometres in size, and to obtain quality structures from irregular larger crystals.
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Affiliation(s)
| | - Wuxian Shi
- Photon Sciences, Brookhaven National Laboratory, Upton, NY 11973, USA
| | - Babak Andi
- Photon Sciences, Brookhaven National Laboratory, Upton, NY 11973, USA
| | - Jean Jakoncic
- Photon Sciences, Brookhaven National Laboratory, Upton, NY 11973, USA
| | - Yuan Gao
- Photon Sciences, Brookhaven National Laboratory, Upton, NY 11973, USA
| | | | - Stuart F. Myers
- Photon Sciences, Brookhaven National Laboratory, Upton, NY 11973, USA
| | - Bruno Martins
- Facility for Rare Isotope Beams, Michigan State University, East Lansing, MI 48824, USA
| | - John M. Skinner
- Photon Sciences, Brookhaven National Laboratory, Upton, NY 11973, USA
| | - Jun Aishima
- Photon Sciences, Brookhaven National Laboratory, Upton, NY 11973, USA
| | - Kun Qian
- Photon Sciences, Brookhaven National Laboratory, Upton, NY 11973, USA
| | - Herbert J. Bernstein
- Ronin Institute for Independent Scholarship, c/o NSLS-II, Brookhaven National Laboratory, Upton, NY 11973, USA
| | - Edwin O. Lazo
- Photon Sciences, Brookhaven National Laboratory, Upton, NY 11973, USA
| | - Thomas Langdon
- Photon Sciences, Brookhaven National Laboratory, Upton, NY 11973, USA
| | - John Lara
- Photon Sciences, Brookhaven National Laboratory, Upton, NY 11973, USA
| | | | - Mourad Idir
- Photon Sciences, Brookhaven National Laboratory, Upton, NY 11973, USA
| | - Lei Huang
- Photon Sciences, Brookhaven National Laboratory, Upton, NY 11973, USA
| | - Oleg Chubar
- Photon Sciences, Brookhaven National Laboratory, Upton, NY 11973, USA
| | - Robert M. Sweet
- Photon Sciences, Brookhaven National Laboratory, Upton, NY 11973, USA
| | - Lonny E. Berman
- Photon Sciences, Brookhaven National Laboratory, Upton, NY 11973, USA
| | - Sean McSweeney
- Photon Sciences, Brookhaven National Laboratory, Upton, NY 11973, USA
| | - Martin R. Fuchs
- Photon Sciences, Brookhaven National Laboratory, Upton, NY 11973, USA
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Abstract
X-ray crystallography enables detailed structural studies of proteins to understand and modulate their function. Conducting crystallographic experiments at cryogenic temperatures has practical benefits but potentially limits the identification of functionally important alternative protein conformations that can be revealed only at room temperature (RT). This review discusses practical aspects of preparing, acquiring, and analyzing X-ray crystallography data at RT to demystify preconceived impracticalities that freeze progress of routine RT data collection at synchrotron sources. Examples are presented as conceptual and experimental templates to enable the design of RT-inspired studies; they illustrate the diversity and utility of gaining novel insights into protein conformational landscapes. An integrative view of protein conformational dynamics enables opportunities to advance basic and biomedical research.
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Zhu L, Chen X, Abola EE, Jing L, Liu W. Serial Crystallography for Structure-Based Drug Discovery. Trends Pharmacol Sci 2020; 41:830-839. [PMID: 32950259 PMCID: PMC7572805 DOI: 10.1016/j.tips.2020.08.009] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2020] [Revised: 07/17/2020] [Accepted: 08/25/2020] [Indexed: 02/07/2023]
Abstract
Rational drug discovery has greatly accelerated the development of safer and more efficacious therapeutics, assisted significantly by insights from experimentally determined 3D structures of ligands in complex with their targets. Serial crystallography (SX) with X-ray free-electron lasers has enabled structural determination using micrometer- or nanometer-size crystals. This technology, applied in the past decade to solve structures of notoriously difficult-to-study drug targets at room temperature, has now been adapted for use in synchrotron radiation facilities. Ultrashort time scales allow time-resolved characterization of dynamic structural changes and pave the road to study the molecular mechanisms by 'molecular movie.' This article summarizes the latest progress in SX technology and deliberates its demanding applications in future structure-based drug discovery.
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Affiliation(s)
- Lan Zhu
- Biodesign Center for Applied Structural Discovery, Biodesign Institute, Arizona State University, Tempe, AZ 85287, USA; School of Molecular Sciences, Arizona State University, Tempe, AZ 85287, USA
| | - Xiaoyu Chen
- Biodesign Center for Applied Structural Discovery, Biodesign Institute, Arizona State University, Tempe, AZ 85287, USA; School of Molecular Sciences, Arizona State University, Tempe, AZ 85287, USA
| | - Enrique E Abola
- Biodesign Center for Applied Structural Discovery, Biodesign Institute, Arizona State University, Tempe, AZ 85287, USA; School of Molecular Sciences, Arizona State University, Tempe, AZ 85287, USA
| | - Liang Jing
- Biodesign Center for Applied Structural Discovery, Biodesign Institute, Arizona State University, Tempe, AZ 85287, USA; School of Molecular Sciences, Arizona State University, Tempe, AZ 85287, USA
| | - Wei Liu
- Biodesign Center for Applied Structural Discovery, Biodesign Institute, Arizona State University, Tempe, AZ 85287, USA; School of Molecular Sciences, Arizona State University, Tempe, AZ 85287, USA.
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14
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Abstract
Radiation damage and cryogenic sample environment are an experimental limitation observed in the traditional X-ray crystallography technique. However, the serial crystallography (SX) technique not only helps to determine structures at room temperature with minimal radiation damage, but it is also a useful tool for profound understanding of macromolecules. Moreover, it is a new tool for time-resolved studies. Over the past 10 years, various sample delivery techniques and data collection strategies have been developed in the SX field. It also has a wide range of applications in instruments ranging from the X-ray free electron laser (XFEL) facility to synchrotrons. The importance of the various approaches in terms of the experimental techniques and a brief review of the research carried out in the field of SX has been highlighted in this editorial.
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15
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Kuei B, Bator C, Gomez ED. Imaging 0.36 nm Lattice Planes in Conjugated Polymers by Minimizing Beam Damage. Macromolecules 2020. [DOI: 10.1021/acs.macromol.0c01082] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Brooke Kuei
- Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Carol Bator
- Huck Life Sciences, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Enrique D. Gomez
- Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
- Department of Chemical Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
- Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
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16
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Zhao F, Zhang B, Yan E, Sun B, Wang Z, He J, Yin D. A guide to sample delivery systems for serial crystallography. FEBS J 2019; 286:4402-4417. [DOI: 10.1111/febs.15099] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2019] [Revised: 09/26/2019] [Accepted: 10/15/2019] [Indexed: 01/07/2023]
Affiliation(s)
- Feng‐Zhu Zhao
- School of Life Sciences Northwestern Polytechnical University Xi'an China
| | - Bin Zhang
- School of Life Sciences Northwestern Polytechnical University Xi'an China
| | - Er‐Kai Yan
- School of Life Sciences Northwestern Polytechnical University Xi'an China
| | - Bo Sun
- Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai China
| | - Zhi‐Jun Wang
- Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai China
| | - Jian‐Hua He
- Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai China
| | - Da‐Chuan Yin
- School of Life Sciences Northwestern Polytechnical University Xi'an China
- Shenzhen Research Institute Northwestern Polytechnical University Shenzhen China
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17
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Moreau DW, Atakisi H, Thorne RE. Solvent flows, conformation changes and lattice reordering in a cold protein crystal. Acta Crystallogr D Struct Biol 2019; 75:980-994. [PMID: 31692472 PMCID: PMC6834080 DOI: 10.1107/s2059798319013822] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2019] [Accepted: 10/10/2019] [Indexed: 11/10/2022] Open
Abstract
When protein crystals are abruptly cooled, the unit-cell, protein and solvent-cavity volumes all contract, but the volume of bulk-like internal solvent may expand. Outflow of this solvent from the unit cell and its accumulation in defective interior crystal regions has been suggested as one cause of the large increase in crystal mosaicity on cooling. It is shown that when apoferritin crystals are abruptly cooled to temperatures between 220 and 260 K, the unit cell contracts, solvent is pushed out and the mosaicity grows. On temperature-dependent timescales of 10 to 200 s, the unit-cell and solvent-cavity volume then expand, solvent flows back in, and the mosaicity and B factor both drop. Expansion and reordering at fixed low temperature are associated with small-amplitude but large-scale changes in the conformation and packing of apoferritin. These results demonstrate that increases in mosaicity on cooling arise due to solvent flows out of or into the unit cell and to incomplete, arrested relaxation of protein conformation. They indicate a critical role for time in variable-temperature crystallographic studies, and the feasibility of probing interactions and cooperative conformational changes that underlie cold denaturation in the presence of liquid solvent at temperatures down to ∼200 K.
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Affiliation(s)
- David W. Moreau
- Physics Department, Cornell University, Ithaca, NY 14853, USA
| | - Hakan Atakisi
- Physics Department, Cornell University, Ithaca, NY 14853, USA
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18
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Atakisi H, Conger L, Moreau DW, Thorne RE. Resolution and dose dependence of radiation damage in biomolecular systems. IUCRJ 2019; 6:1040-1053. [PMID: 31709060 PMCID: PMC6830208 DOI: 10.1107/s2052252519008777] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/04/2019] [Accepted: 06/19/2019] [Indexed: 05/30/2023]
Abstract
The local Fourier-space relation between diffracted intensity I, diffraction wavevector q and dose D, , is key to probing and understanding radiation damage by X-rays and energetic particles in both diffraction and imaging experiments. The models used in protein crystallography for the last 50 years provide good fits to experimental I(q) versus nominal dose data, but have unclear physical significance. More recently, a fit to diffraction and imaging experiments suggested that the maximum tolerable dose varies as q -1 or linearly with resolution. Here, it is shown that crystallographic data have been strongly perturbed by the effects of spatially nonuniform crystal irradiation and diffraction during data collection. Reanalysis shows that these data are consistent with a purely exponential local dose dependence, = I 0(q)exp[-D/D e(q)], where D e(q) ∝ q α with α ≃ 1.7. A physics-based model for radiation damage, in which damage events occurring at random locations within a sample each cause energy deposition and blurring of the electron density within a small volume, predicts this exponential variation with dose for all q values and a decay exponent α ≃ 2 in two and three dimensions, roughly consistent with both diffraction and imaging experiments over more than two orders of magnitude in resolution. The B-factor model used to account for radiation damage in crystallographic scaling programs is consistent with α = 2, but may not accurately capture the dose dependencies of structure factors under typical nonuniform illumination conditions. The strong q dependence of radiation-induced diffraction decays implies that the previously proposed 20-30 MGy dose limit for protein crystallography should be replaced by a resolution-dependent dose limit that, for atomic resolution data sets, will be much smaller. The results suggest that the physics underlying basic experimental trends in radiation damage at T ≃ 100 K is straightforward and universal. Deviations of the local I(q, D) from strictly exponential behavior may provide mechanistic insights, especially into the radiation-damage processes responsible for the greatly increased radiation sensitivity observed at T ≃ 300 K.
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Affiliation(s)
- Hakan Atakisi
- Physics Department, Cornell University, Ithaca, NY 14853, USA
| | | | - David W. Moreau
- Physics Department, Cornell University, Ithaca, NY 14853, USA
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19
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Martin-Garcia JM, Zhu L, Mendez D, Lee MY, Chun E, Li C, Hu H, Subramanian G, Kissick D, Ogata C, Henning R, Ishchenko A, Dobson Z, Zhang S, Weierstall U, Spence JCH, Fromme P, Zatsepin NA, Fischetti RF, Cherezov V, Liu W. High-viscosity injector-based pink-beam serial crystallography of microcrystals at a synchrotron radiation source. IUCRJ 2019; 6:412-425. [PMID: 31098022 PMCID: PMC6503920 DOI: 10.1107/s205225251900263x] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/24/2018] [Accepted: 02/20/2019] [Indexed: 05/29/2023]
Abstract
Since the first successful serial crystallography (SX) experiment at a synchrotron radiation source, the popularity of this approach has continued to grow showing that third-generation synchrotrons can be viable alternatives to scarce X-ray free-electron laser sources. Synchrotron radiation flux may be increased ∼100 times by a moderate increase in the bandwidth ('pink beam' conditions) at some cost to data analysis complexity. Here, we report the first high-viscosity injector-based pink-beam SX experiments. The structures of proteinase K (PK) and A2A adenosine receptor (A2AAR) were determined to resolutions of 1.8 and 4.2 Å using 4 and 24 consecutive 100 ps X-ray pulse exposures, respectively. Strong PK data were processed using existing Laue approaches, while weaker A2AAR data required an alternative data-processing strategy. This demonstration of the feasibility presents new opportunities for time-resolved experiments with microcrystals to study structural changes in real time at pink-beam synchrotron beamlines worldwide.
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Affiliation(s)
- Jose M. Martin-Garcia
- Biodesign Center for Applied Structural Discovery, Biodesign Institute, Arizona State University, 727 East Tyler Street, Tempe, AZ 85287, USA
- School of Molecular Sciences, Arizona State University, 551 East University Drive, Tempe, AZ 85287, USA
| | - Lan Zhu
- Biodesign Center for Applied Structural Discovery, Biodesign Institute, Arizona State University, 727 East Tyler Street, Tempe, AZ 85287, USA
- School of Molecular Sciences, Arizona State University, 551 East University Drive, Tempe, AZ 85287, USA
| | - Derek Mendez
- Biodesign Center for Applied Structural Discovery, Biodesign Institute, Arizona State University, 727 East Tyler Street, Tempe, AZ 85287, USA
- Department of Physics, Arizona State University, 550 East Tyler Drive, Tempe, AZ 85287, USA
| | - Ming-Yue Lee
- Biodesign Center for Applied Structural Discovery, Biodesign Institute, Arizona State University, 727 East Tyler Street, Tempe, AZ 85287, USA
- School of Molecular Sciences, Arizona State University, 551 East University Drive, Tempe, AZ 85287, USA
| | - Eugene Chun
- Biodesign Center for Applied Structural Discovery, Biodesign Institute, Arizona State University, 727 East Tyler Street, Tempe, AZ 85287, USA
- School of Molecular Sciences, Arizona State University, 551 East University Drive, Tempe, AZ 85287, USA
| | - Chufeng Li
- Biodesign Center for Applied Structural Discovery, Biodesign Institute, Arizona State University, 727 East Tyler Street, Tempe, AZ 85287, USA
- Department of Physics, Arizona State University, 550 East Tyler Drive, Tempe, AZ 85287, USA
| | - Hao Hu
- Department of Physics, Arizona State University, 550 East Tyler Drive, Tempe, AZ 85287, USA
| | - Ganesh Subramanian
- Biodesign Center for Applied Structural Discovery, Biodesign Institute, Arizona State University, 727 East Tyler Street, Tempe, AZ 85287, USA
- Department of Physics, Arizona State University, 550 East Tyler Drive, Tempe, AZ 85287, USA
| | - David Kissick
- Advanced Photon Source, Argonne National Laboratory, 9700 South Cass Ave, Lemont, IL 90439, USA
| | - Craig Ogata
- Advanced Photon Source, Argonne National Laboratory, 9700 South Cass Ave, Lemont, IL 90439, USA
| | - Robert Henning
- Center for Advanced Radiation Sources, The University of Chicago, Argonne National Laboratory, 9700 South Cass Ave, Lemont, IL 90439, USA
| | - Andrii Ishchenko
- Department of Chemistry, Bridge Institute, University of Southern California, 1002 Childs Way, Los Angeles, CA 90089, USA
| | - Zachary Dobson
- Biodesign Center for Applied Structural Discovery, Biodesign Institute, Arizona State University, 727 East Tyler Street, Tempe, AZ 85287, USA
- School of Molecular Sciences, Arizona State University, 551 East University Drive, Tempe, AZ 85287, USA
| | - Shangji Zhang
- Biodesign Center for Applied Structural Discovery, Biodesign Institute, Arizona State University, 727 East Tyler Street, Tempe, AZ 85287, USA
- School of Molecular Sciences, Arizona State University, 551 East University Drive, Tempe, AZ 85287, USA
| | - Uwe Weierstall
- Biodesign Center for Applied Structural Discovery, Biodesign Institute, Arizona State University, 727 East Tyler Street, Tempe, AZ 85287, USA
- Department of Physics, Arizona State University, 550 East Tyler Drive, Tempe, AZ 85287, USA
| | - John C. H. Spence
- Biodesign Center for Applied Structural Discovery, Biodesign Institute, Arizona State University, 727 East Tyler Street, Tempe, AZ 85287, USA
- Department of Physics, Arizona State University, 550 East Tyler Drive, Tempe, AZ 85287, USA
| | - Petra Fromme
- Biodesign Center for Applied Structural Discovery, Biodesign Institute, Arizona State University, 727 East Tyler Street, Tempe, AZ 85287, USA
- School of Molecular Sciences, Arizona State University, 551 East University Drive, Tempe, AZ 85287, USA
| | - Nadia A. Zatsepin
- Biodesign Center for Applied Structural Discovery, Biodesign Institute, Arizona State University, 727 East Tyler Street, Tempe, AZ 85287, USA
- Department of Physics, Arizona State University, 550 East Tyler Drive, Tempe, AZ 85287, USA
| | - Robert F. Fischetti
- Advanced Photon Source, Argonne National Laboratory, 9700 South Cass Ave, Lemont, IL 90439, USA
| | - Vadim Cherezov
- Department of Chemistry, Bridge Institute, University of Southern California, 1002 Childs Way, Los Angeles, CA 90089, USA
| | - Wei Liu
- Biodesign Center for Applied Structural Discovery, Biodesign Institute, Arizona State University, 727 East Tyler Street, Tempe, AZ 85287, USA
- School of Molecular Sciences, Arizona State University, 551 East University Drive, Tempe, AZ 85287, USA
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20
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Radiation damage to organic and inorganic specimens in the TEM. Micron 2019; 119:72-87. [DOI: 10.1016/j.micron.2019.01.005] [Citation(s) in RCA: 174] [Impact Index Per Article: 34.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2018] [Revised: 01/15/2019] [Accepted: 01/16/2019] [Indexed: 02/07/2023]
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21
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Melo LGA, Hitchcock AP. Electron beam damage of perfluorosulfonic acid studied by soft X-ray spectromicroscopy. Micron 2019; 121:8-20. [PMID: 30875488 DOI: 10.1016/j.micron.2019.02.006] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2018] [Revised: 02/08/2019] [Accepted: 02/19/2019] [Indexed: 10/27/2022]
Abstract
Scanning transmission X-ray microscopy (STXM) was used to study chemical changes to perfluorosulfonic acid (PFSA) spun cast thin films as a function of dose imparted by exposure of a 200 kV electron beam in a Transmission Electron Microscope (TEM). The relationship between electron beam fluence and absorbed dose was calibrated using a modified version of a protocol based on the positive to negative lithography transition in PMMA [Leontowich et al, J. Synchrotron Rad. 19 (2012) 976]. STXM was used to characterize and quantify the chemical changes caused by electron irradiation of PFSA under several different conditions. The critical dose for CF2-CF2 amorphization was used to explore the effects of the sample environment on electron beam damage. Use of a silicon nitride substrate was found to increase the CF2-CF2 amorphization critical dose by ∼x2 from that for free-standing PFSA films. Freestanding PFSA and PMMA films were damaged by 200 kV electrons at ∼100 K and then the damage was measured by STXM at 300 K (RT). The lithography cross-over dose for PMMA was found to be ∼2x higher when the PMMA thin film was electron irradiated at 120 K rather than at 300 K. The critical dose for CF2-CF2 amorphization in PFSA irradiated at 120 K followed by warming and delayed measurement by STXM at 300 K was found to be ∼2x larger than at 300 K. To place these results in the context of the use of electron microscopy to study PFSA ionomer in fuel cell systems, an exposure of 300 e-/nm2 at 300 K (which corresponds to an absorbed dose of ∼20 MGy) amorphizes ∼10% of the CF2-CF2 bonds in PFSA. At this dose level, the spatial resolution for TEM imaging of PFSA is limited to 3.5 nm by radiation damage, if one is using a direct electron detector with DQE = 1. This work recommends caution about 2D and 3D morphological information of PFSA materials based on TEM studies which use fluences higher than 300 e-/nm2.
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Affiliation(s)
- Lis G A Melo
- Dept. Chemistry and Chemical Biology, McMaster University, Hamilton, ON, L8S4M1, Canada.
| | - Adam P Hitchcock
- Dept. Chemistry and Chemical Biology, McMaster University, Hamilton, ON, L8S4M1, Canada
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22
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Nam KH. Sample Delivery Media for Serial Crystallography. Int J Mol Sci 2019; 20:ijms20051094. [PMID: 30836596 PMCID: PMC6429298 DOI: 10.3390/ijms20051094] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2019] [Revised: 02/27/2019] [Accepted: 02/27/2019] [Indexed: 01/19/2023] Open
Abstract
X-ray crystallographic methods can be used to visualize macromolecules at high resolution. This provides an understanding of molecular mechanisms and an insight into drug development and rational engineering of enzymes used in the industry. Although conventional synchrotron-based X-ray crystallography remains a powerful tool for understanding molecular function, it has experimental limitations, including radiation damage, cryogenic temperature, and static structural information. Serial femtosecond crystallography (SFX) using X-ray free electron laser (XFEL) and serial millisecond crystallography (SMX) using synchrotron X-ray have recently gained attention as research methods for visualizing macromolecules at room temperature without causing or reducing radiation damage, respectively. These techniques provide more biologically relevant structures than traditional X-ray crystallography at cryogenic temperatures using a single crystal. Serial femtosecond crystallography techniques visualize the dynamics of macromolecules through time-resolved experiments. In serial crystallography (SX), one of the most important aspects is the delivery of crystal samples efficiently, reliably, and continuously to an X-ray interaction point. A viscous delivery medium, such as a carrier matrix, dramatically reduces sample consumption, contributing to the success of SX experiments. This review discusses the preparation and criteria for the selection and development of a sample delivery medium and its application for SX.
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Affiliation(s)
- Ki Hyun Nam
- Division of Biotechnology, College of Life Sciences and Biotechnology, Korea University, Seoul 02841, Korea.
- Institute of Life Science and Natural Resources, Korea University, Seoul 02841, Korea.
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23
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Monteiro DCF, Vakili M, Harich J, Sztucki M, Meier SM, Horrell S, Josts I, Trebbin M. A microfluidic flow-focusing device for low sample consumption serial synchrotron crystallography experiments in liquid flow. JOURNAL OF SYNCHROTRON RADIATION 2019; 26:406-412. [PMID: 30855249 DOI: 10.1107/s1600577519000304] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/08/2018] [Accepted: 01/07/2019] [Indexed: 06/09/2023]
Abstract
Serial synchrotron crystallography allows low X-ray dose, room-temperature crystal structures of proteins to be determined from a population of microcrystals. Protein production and crystallization is a non-trivial procedure and it is essential to have X-ray-compatible sample environments that keep sample consumption low and the crystals in their native environment. This article presents a fast and optimized manufacturing route to metal-polyimide microfluidic flow-focusing devices which allow for the collection of X-ray diffraction data in flow. The flow-focusing conditions allow for sample consumption to be significantly decreased, while also opening up the possibility of more complex experiments such as rapid mixing for time-resolved serial crystallography. This high-repetition-rate experiment allows for full datasets to be obtained quickly (∼1 h) from crystal slurries in liquid flow. The X-ray compatible microfluidic chips are easily manufacturable, reliable and durable and require sample-flow rates on the order of only 30 µl h-1.
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Affiliation(s)
- Diana C F Monteiro
- The Hamburg Centre for Ultrafast Imaging, Universität Hamburg, Luruper Chaussee 149, Hamburg 22761, Germany
| | - Mohammad Vakili
- The Hamburg Centre for Ultrafast Imaging, Universität Hamburg, Luruper Chaussee 149, Hamburg 22761, Germany
| | - Jessica Harich
- The Hamburg Centre for Ultrafast Imaging, Universität Hamburg, Luruper Chaussee 149, Hamburg 22761, Germany
| | - Michael Sztucki
- ESRF, European Synchrotron Radiation Facility, 71 Avenue des Martyrs, Grenoble CS 40220, France
| | - Susanne M Meier
- The Hamburg Centre for Ultrafast Imaging, Universität Hamburg, Luruper Chaussee 149, Hamburg 22761, Germany
| | - Sam Horrell
- The Hamburg Centre for Ultrafast Imaging, Universität Hamburg, Luruper Chaussee 149, Hamburg 22761, Germany
| | - Inokentijs Josts
- The Hamburg Centre for Ultrafast Imaging, Universität Hamburg, Luruper Chaussee 149, Hamburg 22761, Germany
| | - Martin Trebbin
- The Hamburg Centre for Ultrafast Imaging, Universität Hamburg, Luruper Chaussee 149, Hamburg 22761, Germany
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24
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Ebrahim A, Appleby MV, Axford D, Beale J, Moreno-Chicano T, Sherrell DA, Strange RW, Hough MA, Owen RL. Resolving polymorphs and radiation-driven effects in microcrystals using fixed-target serial synchrotron crystallography. Acta Crystallogr D Struct Biol 2019; 75:151-159. [PMID: 30821704 PMCID: PMC6400251 DOI: 10.1107/s2059798318010240] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2018] [Accepted: 07/16/2018] [Indexed: 11/11/2022] Open
Abstract
The ability to determine high-quality, artefact-free structures is a challenge in micro-crystallography, and the rapid onset of radiation damage and requirement for a high-brilliance X-ray beam mean that a multi-crystal approach is essential. However, the combination of crystal-to-crystal variation and X-ray-induced changes can make the formation of a final complete data set challenging; this is particularly true in the case of metalloproteins, where X-ray-induced changes occur rapidly and at the active site. An approach is described that allows the resolution, separation and structure determination of crystal polymorphs, and the tracking of radiation damage in microcrystals. Within the microcrystal population of copper nitrite reductase, two polymorphs with different unit-cell sizes were successfully separated to determine two independent structures, and an X-ray-driven change between these polymorphs was followed. This was achieved through the determination of multiple serial structures from microcrystals using a high-throughput high-speed fixed-target approach coupled with robust data processing.
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Affiliation(s)
- Ali Ebrahim
- School of Biological Sciences, University of Essex, Wivenhoe Park, Colchester CO4 3SQ, England
- Diamond Light Source, Harwell Science and Innovation Campus, Didcot OX11 0DE, England
| | - Martin V. Appleby
- Diamond Light Source, Harwell Science and Innovation Campus, Didcot OX11 0DE, England
| | - Danny Axford
- Diamond Light Source, Harwell Science and Innovation Campus, Didcot OX11 0DE, England
| | - John Beale
- Diamond Light Source, Harwell Science and Innovation Campus, Didcot OX11 0DE, England
| | - Tadeo Moreno-Chicano
- School of Biological Sciences, University of Essex, Wivenhoe Park, Colchester CO4 3SQ, England
| | - Darren A. Sherrell
- Diamond Light Source, Harwell Science and Innovation Campus, Didcot OX11 0DE, England
| | - Richard W. Strange
- School of Biological Sciences, University of Essex, Wivenhoe Park, Colchester CO4 3SQ, England
| | - Michael A. Hough
- School of Biological Sciences, University of Essex, Wivenhoe Park, Colchester CO4 3SQ, England
| | - Robin L. Owen
- Diamond Light Source, Harwell Science and Innovation Campus, Didcot OX11 0DE, England
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25
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Keedy DA. Journey to the center of the protein: allostery from multitemperature multiconformer X-ray crystallography. Acta Crystallogr D Struct Biol 2019; 75:123-137. [PMID: 30821702 PMCID: PMC6400254 DOI: 10.1107/s2059798318017941] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2018] [Accepted: 12/19/2018] [Indexed: 02/08/2023] Open
Abstract
Proteins inherently fluctuate between conformations to perform functions in the cell. For example, they sample product-binding, transition-state-stabilizing and product-release states during catalysis, and they integrate signals from remote regions of the structure for allosteric regulation. However, there is a lack of understanding of how these dynamic processes occur at the basic atomic level. This gap can be at least partially addressed by combining variable-temperature (instead of traditional cryogenic temperature) X-ray crystallography with algorithms for modeling alternative conformations based on electron-density maps, in an approach called multitemperature multiconformer X-ray crystallography (MMX). Here, the use of MMX to reveal alternative conformations at different sites in a protein structure and to estimate the degree of energetic coupling between them is discussed. These insights can suggest testable hypotheses about allosteric mechanisms. Temperature is an easily manipulated experimental parameter, so the MMX approach is widely applicable to any protein that yields well diffracting crystals. Moreover, the general principles of MMX are extensible to other perturbations such as pH, pressure, ligand concentration etc. Future work will explore strategies for leveraging X-ray data across such perturbation series to more quantitatively measure how different parts of a protein structure are coupled to each other, and the consequences thereof for allostery and other aspects of protein function.
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Affiliation(s)
- Daniel A. Keedy
- Structural Biology Initiative, CUNY Advanced Science Research Center, New York, USA
- Department of Chemistry and Biochemistry, City College of New York, New York, USA
- PhD Programs in Chemistry and Biochemistry, The Graduate Center of the City University of New York, New York, USA
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26
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Risk of secondary rectal cancer and colon cancer after radiotherapy for prostate cancer: a meta-analysis. Int J Colorectal Dis 2018; 33:1149-1158. [PMID: 29961918 DOI: 10.1007/s00384-018-3114-7] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 06/22/2018] [Indexed: 02/04/2023]
Abstract
PURPOSE To investigate whether radiotherapy for prostate cancer increases the risk of therapy-related rectal cancer and colon cancer. METHODS A systematic literature search was carried out using the Medline (PubMed), EMBASE, and the Cochrane Library to identify studies examining the association between radiotherapy for prostate cancer and secondary colorectal cancer (rectal cancer and colon cancer) published before March 19, 2018. The risk of second colorectal cancer after radiotherapy was summarized using unadjusted odds ratio (OR) and adjusted hazard ratio (HR) with their 95% confidence interval (CI). Subgroup and sensitivity analyses were conducted to detect potential bias and heterogeneity. RESULTS After study selection, 16 reports were retrieved for analysis. When patients received radiotherapy compared with those unexposed to radiation, there was an increased risk of the rectal cancer (OR 1.37, 95%CI 1.01 to 1.85), but not colon cancer. According to adjusted HR, there was an increased risk of the rectal cancer (HR 1.64, 95%CI 1.39 to 1.94), and colon cancer (HR 1.33, 95%CI 1.02 to 1.76). The OR for rectal cancer showed an increased risk with longer latent period (5 years lag time versus 10 years lag time, OR: 1.56 versus 2.22). Brachytherapy had no association with second cancer across all analyses. CONCLUSIONS Radiotherapy was associated with an increased risk of subsequent rectal cancer compared with patients unexposed to radiation. Colon may be free from the damage of radiation. Brachytherapy had no association with second rectal cancer or colon cancer.
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27
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Gao Y, Xu W, Shi W, Soares A, Jakoncic J, Myers S, Martins B, Skinner J, Liu Q, Bernstein H, McSweeney S, Nazaretski E, Fuchs MR. High-speed raster-scanning synchrotron serial microcrystallography with a high-precision piezo-scanner. JOURNAL OF SYNCHROTRON RADIATION 2018; 25:1362-1370. [PMID: 30179174 PMCID: PMC6140394 DOI: 10.1107/s1600577518010354] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/04/2018] [Accepted: 07/18/2018] [Indexed: 05/06/2023]
Abstract
The Frontier Microfocus Macromolecular Crystallography (FMX) beamline at the National Synchrotron Light Source II with its 1 µm beam size and photon flux of 3 × 1012 photons s-1 at a photon energy of 12.66 keV has reached unprecedented dose rates for a structural biology beamline. The high dose rate presents a great advantage for serial microcrystallography in cutting measurement time from hours to minutes. To provide the instrumentation basis for such measurements at the full flux of the FMX beamline, a high-speed, high-precision goniometer based on a unique XYZ piezo positioner has been designed and constructed. The piezo-based goniometer is able to achieve sub-100 nm raster-scanning precision at over 10 grid-linepairs s-1 frequency for fly scans of a 200 µm-wide raster. The performance of the scanner in both laboratory and serial crystallography measurements up to the maximum frame rate of 750 Hz of the Eiger 16M's 4M region-of-interest mode has been verified in this work. This unprecedented experimental speed significantly reduces serial-crystallography data collection time at synchrotrons, allowing utilization of the full brightness of the emerging synchrotron radiation facilities.
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Affiliation(s)
- Yuan Gao
- Photon Sciences, Brookhaven National Laboratory, Upton, NY 11973, USA
| | - Weihe Xu
- Photon Sciences, Brookhaven National Laboratory, Upton, NY 11973, USA
| | - Wuxian Shi
- Photon Sciences, Brookhaven National Laboratory, Upton, NY 11973, USA
- Case Center for Synchrotron Biosciences, Case Western Reserve University, OH 44106, USA
| | - Alexei Soares
- Photon Sciences, Brookhaven National Laboratory, Upton, NY 11973, USA
| | - Jean Jakoncic
- Photon Sciences, Brookhaven National Laboratory, Upton, NY 11973, USA
| | - Stuart Myers
- Photon Sciences, Brookhaven National Laboratory, Upton, NY 11973, USA
| | - Bruno Martins
- Photon Sciences, Brookhaven National Laboratory, Upton, NY 11973, USA
| | - John Skinner
- Photon Sciences, Brookhaven National Laboratory, Upton, NY 11973, USA
| | - Qun Liu
- Photon Sciences, Brookhaven National Laboratory, Upton, NY 11973, USA
| | - Herbert Bernstein
- Photon Sciences, Brookhaven National Laboratory, Upton, NY 11973, USA
- School of Chemistry and Materials Science, Rochester Institute of Technology, NY 14623, USA
| | - Sean McSweeney
- Photon Sciences, Brookhaven National Laboratory, Upton, NY 11973, USA
| | - Evgeny Nazaretski
- Photon Sciences, Brookhaven National Laboratory, Upton, NY 11973, USA
| | - Martin R. Fuchs
- Photon Sciences, Brookhaven National Laboratory, Upton, NY 11973, USA
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28
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Hattne J, Shi D, Glynn C, Zee CT, Gallagher-Jones M, Martynowycz MW, Rodriguez JA, Gonen T. Analysis of Global and Site-Specific Radiation Damage in Cryo-EM. Structure 2018; 26:759-766.e4. [PMID: 29706530 DOI: 10.1016/j.str.2018.03.021] [Citation(s) in RCA: 111] [Impact Index Per Article: 18.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2017] [Revised: 02/01/2018] [Accepted: 03/30/2018] [Indexed: 11/20/2022]
Abstract
Micro-crystal electron diffraction (MicroED) combines the efficiency of electron scattering with diffraction to allow structure determination from nano-sized crystalline samples in cryoelectron microscopy (cryo-EM). It has been used to solve structures of a diverse set of biomolecules and materials, in some cases to sub-atomic resolution. However, little is known about the damaging effects of the electron beam on samples during such measurements. We assess global and site-specific damage from electron radiation on nanocrystals of proteinase K and of a prion hepta-peptide and find that the dynamics of electron-induced damage follow well-established trends observed in X-ray crystallography. Metal ions are perturbed, disulfide bonds are broken, and acidic side chains are decarboxylated while the diffracted intensities decay exponentially with increasing exposure. A better understanding of radiation damage in MicroED improves our assessment and processing of all types of cryo-EM data.
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Affiliation(s)
- Johan Hattne
- Howard Hughes Medical Institute, University of California, Los Angeles, Los Angeles CA 90095, USA; Janelia Research Campus, Howard Hughes Medical Institute, Ashburn, VA 20147, USA
| | - Dan Shi
- Janelia Research Campus, Howard Hughes Medical Institute, Ashburn, VA 20147, USA
| | - Calina Glynn
- Department of Chemistry and Biochemistry, UCLA-DOE Institute, University of California, Los Angeles, Los Angeles, CA 90095, USA
| | - Chih-Te Zee
- Department of Chemistry and Biochemistry, UCLA-DOE Institute, University of California, Los Angeles, Los Angeles, CA 90095, USA
| | - Marcus Gallagher-Jones
- Department of Chemistry and Biochemistry, UCLA-DOE Institute, University of California, Los Angeles, Los Angeles, CA 90095, USA
| | - Michael W Martynowycz
- Howard Hughes Medical Institute, University of California, Los Angeles, Los Angeles CA 90095, USA; Janelia Research Campus, Howard Hughes Medical Institute, Ashburn, VA 20147, USA
| | - Jose A Rodriguez
- Department of Chemistry and Biochemistry, UCLA-DOE Institute, University of California, Los Angeles, Los Angeles, CA 90095, USA
| | - Tamir Gonen
- Howard Hughes Medical Institute, University of California, Los Angeles, Los Angeles CA 90095, USA; Janelia Research Campus, Howard Hughes Medical Institute, Ashburn, VA 20147, USA; Departments of Physiology and Biological Chemistry, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles CA 90095, USA.
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29
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Abstract
Radiation damage still remains a major limitation and challenge in macromolecular X-ray crystallography. Some of the high-intensity radiation used for diffraction data collection experiments is absorbed by the crystals, generating free radicals. These give rise to radiation damage even at cryotemperatures (~100 K), which can lead to incorrect biological conclusions being drawn from the resulting structure, or even prevent structure solution entirely. Investigation of mitigation strategies and the effects caused by radiation damage has been extensive over the past fifteen years. Here, recent understanding of the physical and chemical phenomena of radiation damage is described, along with the global effects inflicted on the collected data and the specific effects observed in the solved structure. Furthermore, this review aims to summarise the progress made in radiation damage studies in macromolecular crystallography from the experimentalist’s point of view and to give an introduction to the current literature.
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30
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Warkentin MA, Atakisi H, Hopkins JB, Walko D, Thorne RE. Lifetimes and spatio-temporal response of protein crystals in intense X-ray microbeams. IUCRJ 2017; 4:785-794. [PMID: 29123681 PMCID: PMC5668864 DOI: 10.1107/s2052252517013495] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/27/2017] [Accepted: 09/20/2017] [Indexed: 05/22/2023]
Abstract
Serial synchrotron-based crystallography using intense microfocused X-ray beams, fast-framing detectors and protein microcrystals held at 300 K promises to expand the range of accessible structural targets and to increase overall structure-pipeline throughputs. To explore the nature and consequences of X-ray radiation damage under microbeam illumination, the time-, dose- and temperature-dependent evolution of crystal diffraction have been measured with maximum dose rates of 50 MGy s-1. At all temperatures and dose rates, the integrated diffraction intensity for a fixed crystal orientation shows non-exponential decays with dose. Non-exponential decays are a consequence of non-uniform illumination and the resulting spatial evolution of diffracted intensity within the illuminated crystal volume. To quantify radiation-damage lifetimes and the damage state of diffracting crystal regions, a revised diffraction-weighted dose (DWD) is defined and it is shown that for Gaussian beams the DWD becomes nearly independent of actual dose at large doses. An apparent delayed onset of radiation damage seen in some intensity-dose curves is in fact a consequence of damage. Intensity fluctuations at high dose rates may arise from the impulsive release of gaseous damage products. Accounting for these effects, data collection at the highest dose rates increases crystal radiation lifetimes near 300 K (but not at 100 K) by a factor of ∼1.5-2 compared with those observed at conventional dose rates. Improved quantification and modeling of the complex spatio-temporal evolution of protein microcrystal diffraction in intense microbeams will enable more efficient data collection, and will be essential in improving the accuracy of structure factors and structural models.
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Affiliation(s)
- Matthew A. Warkentin
- Physics Department, Cornell University, Clark Hall, Ithaca, NY 14853, USA
- Rubota Corporation, 1260 NW Naito Parkway #609, Portland, OR 97209, USA
| | - Hakan Atakisi
- Physics Department, Cornell University, Ithaca, NY 14853, USA
| | | | - Donald Walko
- Advanced Photon Source, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439, USA
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31
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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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32
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Martin-Garcia JM, Conrad CE, Nelson G, Stander N, Zatsepin NA, Zook J, Zhu L, Geiger J, Chun E, Kissick D, Hilgart MC, Ogata C, Ishchenko A, Nagaratnam N, Roy-Chowdhury S, Coe J, Subramanian G, Schaffer A, James D, Ketwala G, Venugopalan N, Xu S, Corcoran S, Ferguson D, Weierstall U, Spence JCH, Cherezov V, Fromme P, Fischetti RF, Liu W. Serial millisecond crystallography of membrane and soluble protein microcrystals using synchrotron radiation. IUCRJ 2017; 4:439-454. [PMID: 28875031 PMCID: PMC5571807 DOI: 10.1107/s205225251700570x] [Citation(s) in RCA: 74] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/27/2017] [Accepted: 04/13/2017] [Indexed: 05/17/2023]
Abstract
Crystal structure determination of biological macromolecules using the novel technique of serial femtosecond crystallography (SFX) is severely limited by the scarcity of X-ray free-electron laser (XFEL) sources. However, recent and future upgrades render microfocus beamlines at synchrotron-radiation sources suitable for room-temperature serial crystallography data collection also. Owing to the longer exposure times that are needed at synchrotrons, serial data collection is termed serial millisecond crystallography (SMX). As a result, the number of SMX experiments is growing rapidly, with a dozen experiments reported so far. Here, the first high-viscosity injector-based SMX experiments carried out at a US synchrotron source, the Advanced Photon Source (APS), are reported. Microcrystals (5-20 µm) of a wide variety of proteins, including lysozyme, thaumatin, phycocyanin, the human A2A adenosine receptor (A2AAR), the soluble fragment of the membrane lipoprotein Flpp3 and proteinase K, were screened. Crystals suspended in lipidic cubic phase (LCP) or a high-molecular-weight poly(ethylene oxide) (PEO; molecular weight 8 000 000) were delivered to the beam using a high-viscosity injector. In-house data-reduction (hit-finding) software developed at APS as well as the SFX data-reduction and analysis software suites Cheetah and CrystFEL enabled efficient on-site SMX data monitoring, reduction and processing. Complete data sets were collected for A2AAR, phycocyanin, Flpp3, proteinase K and lysozyme, and the structures of A2AAR, phycocyanin, proteinase K and lysozyme were determined at 3.2, 3.1, 2.65 and 2.05 Å resolution, respectively. The data demonstrate the feasibility of serial millisecond crystallography from 5-20 µm crystals using a high-viscosity injector at APS. The resolution of the crystal structures obtained in this study was dictated by the current flux density and crystal size, but upcoming developments in beamline optics and the planned APS-U upgrade will increase the intensity by two orders of magnitude. These developments will enable structure determination from smaller and/or weakly diffracting microcrystals.
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Affiliation(s)
- Jose M. Martin-Garcia
- School of Molecular Sciences and Biodesign Center for Applied Structural Discovery, Biodesign Institute, Arizona State University, Tempe, AZ 85287, USA
| | - Chelsie E. Conrad
- School of Molecular Sciences and Biodesign Center for Applied Structural Discovery, Biodesign Institute, Arizona State University, Tempe, AZ 85287, USA
- Structural Biophysics Laboratory, National Cancer Institute, Frederick, MD 21702, USA
| | - Garrett Nelson
- School of Molecular Sciences and Biodesign Center for Applied Structural Discovery, Biodesign Institute, Arizona State University, Tempe, AZ 85287, USA
- Department of Physics, Arizona State University, PO Box 871504, Tempe, AZ 85287, USA
| | - Natasha Stander
- School of Molecular Sciences and Biodesign Center for Applied Structural Discovery, Biodesign Institute, Arizona State University, Tempe, AZ 85287, USA
- Department of Physics, Arizona State University, PO Box 871504, Tempe, AZ 85287, USA
| | - Nadia A. Zatsepin
- School of Molecular Sciences and Biodesign Center for Applied Structural Discovery, Biodesign Institute, Arizona State University, Tempe, AZ 85287, USA
- Department of Physics, Arizona State University, PO Box 871504, Tempe, AZ 85287, USA
| | - James Zook
- School of Molecular Sciences and Biodesign Center for Applied Structural Discovery, Biodesign Institute, Arizona State University, Tempe, AZ 85287, USA
| | - Lan Zhu
- School of Molecular Sciences and Biodesign Center for Applied Structural Discovery, Biodesign Institute, Arizona State University, Tempe, AZ 85287, USA
| | - James Geiger
- School of Molecular Sciences and Biodesign Center for Applied Structural Discovery, Biodesign Institute, Arizona State University, Tempe, AZ 85287, USA
| | - Eugene Chun
- School of Molecular Sciences and Biodesign Center for Applied Structural Discovery, Biodesign Institute, Arizona State University, Tempe, AZ 85287, USA
| | - David Kissick
- Advanced Photon Source, Argonne National Laboratory, 9700 South Cass Avenue, Lemont, IL 60439, USA
| | - Mark C. Hilgart
- Advanced Photon Source, Argonne National Laboratory, 9700 South Cass Avenue, Lemont, IL 60439, USA
| | - Craig Ogata
- Advanced Photon Source, Argonne National Laboratory, 9700 South Cass Avenue, Lemont, IL 60439, USA
| | - Andrii Ishchenko
- Department of Chemistry, Bridge Institute, University of Southern California, 3430 South Vermont Avenue, MC 3303, Los Angeles, CA 90089, USA
| | - Nirupa Nagaratnam
- School of Molecular Sciences and Biodesign Center for Applied Structural Discovery, Biodesign Institute, Arizona State University, Tempe, AZ 85287, USA
| | - Shatabdi Roy-Chowdhury
- School of Molecular Sciences and Biodesign Center for Applied Structural Discovery, Biodesign Institute, Arizona State University, Tempe, AZ 85287, USA
| | - Jesse Coe
- School of Molecular Sciences and Biodesign Center for Applied Structural Discovery, Biodesign Institute, Arizona State University, Tempe, AZ 85287, USA
| | - Ganesh Subramanian
- School of Molecular Sciences and Biodesign Center for Applied Structural Discovery, Biodesign Institute, Arizona State University, Tempe, AZ 85287, USA
- Department of Physics, Arizona State University, PO Box 871504, Tempe, AZ 85287, USA
| | - Alexander Schaffer
- School of Molecular Sciences and Biodesign Center for Applied Structural Discovery, Biodesign Institute, Arizona State University, Tempe, AZ 85287, USA
| | - Daniel James
- Paul Scherrer Institute, 5232 Villigen, Switzerland
| | - Gihan Ketwala
- Department of Physics, Arizona State University, PO Box 871504, Tempe, AZ 85287, USA
| | - Nagarajan Venugopalan
- Advanced Photon Source, Argonne National Laboratory, 9700 South Cass Avenue, Lemont, IL 60439, USA
| | - Shenglan Xu
- Advanced Photon Source, Argonne National Laboratory, 9700 South Cass Avenue, Lemont, IL 60439, USA
| | - Stephen Corcoran
- Advanced Photon Source, Argonne National Laboratory, 9700 South Cass Avenue, Lemont, IL 60439, USA
| | - Dale Ferguson
- Advanced Photon Source, Argonne National Laboratory, 9700 South Cass Avenue, Lemont, IL 60439, USA
| | - Uwe Weierstall
- School of Molecular Sciences and Biodesign Center for Applied Structural Discovery, Biodesign Institute, Arizona State University, Tempe, AZ 85287, USA
- Department of Physics, Arizona State University, PO Box 871504, Tempe, AZ 85287, USA
| | - John C. H. Spence
- Department of Physics, Arizona State University, PO Box 871504, Tempe, AZ 85287, USA
| | - Vadim Cherezov
- Department of Chemistry, Bridge Institute, University of Southern California, 3430 South Vermont Avenue, MC 3303, Los Angeles, CA 90089, USA
| | - Petra Fromme
- School of Molecular Sciences and Biodesign Center for Applied Structural Discovery, Biodesign Institute, Arizona State University, Tempe, AZ 85287, USA
| | - Robert F. Fischetti
- Advanced Photon Source, Argonne National Laboratory, 9700 South Cass Avenue, Lemont, IL 60439, USA
| | - Wei Liu
- School of Molecular Sciences and Biodesign Center for Applied Structural Discovery, Biodesign Institute, Arizona State University, Tempe, AZ 85287, USA
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33
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Abstract
Serial crystallography was developed for the use at free-electron lasers but the approach has recently also been adapted to synchrotron sources. Here we discuss how the synergy between the two X-ray sources will facilitate a wide application of the technique in microcrystallography, room-temperature structure determination and time-resolved studies.
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Affiliation(s)
- Jörg Standfuss
- Laboratory of Biomolecular Research, Division of Biology and Chemistry, Paul Scherrer Institute, Villigen PSI, Switzerland
| | - John Spence
- Department of Physics, Arizona State University, Tempe, Arizona, USA
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34
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Scarborough NM, Godaliyadda GMDP, Ye DH, Kissick DJ, Zhang S, Newman JA, Sheedlo MJ, Chowdhury AU, Fischetti RF, Das C, Buzzard GT, Bouman CA, Simpson GJ. Dynamic X-ray diffraction sampling for protein crystal positioning. JOURNAL OF SYNCHROTRON RADIATION 2017; 24:188-195. [PMID: 28009558 PMCID: PMC5182024 DOI: 10.1107/s160057751601612x] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2016] [Accepted: 10/11/2016] [Indexed: 05/31/2023]
Abstract
A sparse supervised learning approach for dynamic sampling (SLADS) is described for dose reduction in diffraction-based protein crystal positioning. Crystal centering is typically a prerequisite for macromolecular diffraction at synchrotron facilities, with X-ray diffraction mapping growing in popularity as a mechanism for localization. In X-ray raster scanning, diffraction is used to identify the crystal positions based on the detection of Bragg-like peaks in the scattering patterns; however, this additional X-ray exposure may result in detectable damage to the crystal prior to data collection. Dynamic sampling, in which preceding measurements inform the next most information-rich location to probe for image reconstruction, significantly reduced the X-ray dose experienced by protein crystals during positioning by diffraction raster scanning. The SLADS algorithm implemented herein is designed for single-pixel measurements and can select a new location to measure. In each step of SLADS, the algorithm selects the pixel, which, when measured, maximizes the expected reduction in distortion given previous measurements. Ground-truth diffraction data were obtained for a 5 µm-diameter beam and SLADS reconstructed the image sampling 31% of the total volume and only 9% of the interior of the crystal greatly reducing the X-ray dosage on the crystal. Using in situ two-photon-excited fluorescence microscopy measurements as a surrogate for diffraction imaging with a 1 µm-diameter beam, the SLADS algorithm enabled image reconstruction from a 7% sampling of the total volume and 12% sampling of the interior of the crystal. When implemented into the beamline at Argonne National Laboratory, without ground-truth images, an acceptable reconstruction was obtained with 3% of the image sampled and approximately 5% of the crystal. The incorporation of SLADS into X-ray diffraction acquisitions has the potential to significantly minimize the impact of X-ray exposure on the crystal by limiting the dose and area exposed for image reconstruction and crystal positioning using data collection hardware present in most macromolecular crystallography end-stations.
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Affiliation(s)
| | | | - Dong Hye Ye
- Department of Electrical and Computer Engineering, Purdue University, West Lafayette, IN 47907, USA
| | - David J. Kissick
- GM/CA@APS, X-ray Science Division, Argonne National Laboratory, Lemont, IL 60439, USA
| | - Shijie Zhang
- Department of Chemistry, Purdue University, West Lafayette, IN 47907, USA
| | - Justin A. Newman
- Department of Chemistry, Purdue University, West Lafayette, IN 47907, USA
| | - Michael J. Sheedlo
- Department of Chemistry, Purdue University, West Lafayette, IN 47907, USA
| | - Azhad U. Chowdhury
- Department of Chemistry, Purdue University, West Lafayette, IN 47907, USA
| | - Robert F. Fischetti
- GM/CA@APS, X-ray Science Division, Argonne National Laboratory, Lemont, IL 60439, USA
| | - Chittaranjan Das
- Department of Chemistry, Purdue University, West Lafayette, IN 47907, USA
| | - Gregery T. Buzzard
- Department of Mathematics, Purdue University, West Lafayette, IN 47907, USA
| | - Charles A. Bouman
- Department of Electrical and Computer Engineering, Purdue University, West Lafayette, IN 47907, USA
| | - Garth J. Simpson
- Department of Chemistry, Purdue University, West Lafayette, IN 47907, USA
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35
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Abstract
Radiation damage inflicted on macromolecular crystals during X-ray diffraction experiments remains a limiting factor for structure solution, even when samples are cooled to cryotemperatures (~100 K). Efforts to establish mitigation strategies are ongoing and various approaches, summarized below, have been investigated over the last 15 years, resulting in a deeper understanding of the physical and chemical factors affecting damage rates. The recent advent of X-ray free electron lasers permits "diffraction-before-destruction" by providing highly brilliant and short (a few tens of fs) X-ray pulses. New fourth generation synchrotron sources now coming on line with higher X-ray flux densities than those available from third generation synchrotrons will bring the issue of radiation damage once more to the fore for structural biologists.
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Affiliation(s)
- Elspeth F Garman
- Department of Biochemistry, University of Oxford, South Parks Road, Oxford, OX1 3QU, UK.
| | - Martin Weik
- Institut de Biologie Structurale, University of Grenoble Alpes, CEA, CNRS, 71 Avenue des Martyrs, 38044, Grenoble, France.
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36
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Russi S, González A, Kenner LR, Keedy DA, Fraser JS, van den Bedem H. Conformational variation of proteins at room temperature is not dominated by radiation damage. JOURNAL OF SYNCHROTRON RADIATION 2017; 24:73-82. [PMID: 28009548 PMCID: PMC5182021 DOI: 10.1107/s1600577516017343] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2016] [Accepted: 10/28/2016] [Indexed: 05/09/2023]
Abstract
Protein crystallography data collection at synchrotrons is routinely carried out at cryogenic temperatures to mitigate radiation damage. Although damage still takes place at 100 K and below, the immobilization of free radicals increases the lifetime of the crystals by approximately 100-fold. Recent studies have shown that flash-cooling decreases the heterogeneity of the conformational ensemble and can hide important functional mechanisms from observation. These discoveries have motivated increasing numbers of experiments to be carried out at room temperature. However, the trade-offs between increased risk of radiation damage and increased observation of alternative conformations at room temperature relative to cryogenic temperature have not been examined. A considerable amount of effort has previously been spent studying radiation damage at cryo-temperatures, but the relevance of these studies to room temperature diffraction is not well understood. Here, the effects of radiation damage on the conformational landscapes of three different proteins (T. danielli thaumatin, hen egg-white lysozyme and human cyclophilin A) at room (278 K) and cryogenic (100 K) temperatures are investigated. Increasingly damaged datasets were collected at each temperature, up to a maximum dose of the order of 107 Gy at 100 K and 105 Gy at 278 K. Although it was not possible to discern a clear trend between damage and multiple conformations at either temperature, it was observed that disorder, monitored by B-factor-dependent crystallographic order parameters, increased with higher absorbed dose for the three proteins at 100 K. At 278 K, however, the total increase in this disorder was only statistically significant for thaumatin. A correlation between specific radiation damage affecting side chains and the amount of disorder was not observed. This analysis suggests that elevated conformational heterogeneity in crystal structures at room temperature is observed despite radiation damage, and not as a result thereof.
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Affiliation(s)
- Silvia Russi
- Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
| | - Ana González
- Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
| | - Lillian R. Kenner
- Department of Bioengineering and Therapeutic Sciences, UCSF, San Francisco, CA, USA
| | - Daniel A. Keedy
- Department of Bioengineering and Therapeutic Sciences, UCSF, San Francisco, CA, USA
| | - James S. Fraser
- Department of Bioengineering and Therapeutic Sciences, UCSF, San Francisco, CA, USA
| | - Henry van den Bedem
- Bioscience Department, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
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37
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Broecker J, Klingel V, Ou WL, Balo AR, Kissick D, Ogata CM, Kuo A, Ernst OP. A Versatile System for High-Throughput In Situ X-ray Screening and Data Collection of Soluble and Membrane-Protein Crystals. CRYSTAL GROWTH & DESIGN 2016; 16:6318-6326. [PMID: 28261000 PMCID: PMC5328415 DOI: 10.1021/acs.cgd.6b00950] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/21/2016] [Revised: 09/30/2016] [Indexed: 05/20/2023]
Abstract
In recent years, in situ data collection has been a major focus of progress in protein crystallography. Here, we introduce the Mylar in situ method using Mylar-based sandwich plates that are inexpensive, easy to make and handle, and show significantly less background scattering than other setups. A variety of cognate holders for patches of Mylar in situ sandwich films corresponding to one or more wells makes the method robust and versatile, allows for storage and shipping of entire wells, and enables automated crystal imaging, screening, and goniometer-based X-ray diffraction data-collection at room temperature and under cryogenic conditions for soluble and membrane-protein crystals grown in or transferred to these plates. We validated the Mylar in situ method using crystals of the water-soluble proteins hen egg-white lysozyme and sperm whale myoglobin as well as the 7-transmembrane protein bacteriorhodopsin from Haloquadratum walsbyi. In conjunction with current developments at synchrotrons, this approach promises high-resolution structural studies of membrane proteins to become faster and more routine.
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Affiliation(s)
- Jana Broecker
- Department of Biochemistry and Department of Molecular Genetics, University of Toronto, Toronto, Ontario M5S 1A8, Canada
- E-mail:
| | - Viviane Klingel
- Department of Biochemistry and Department of Molecular Genetics, University of Toronto, Toronto, Ontario M5S 1A8, Canada
| | - Wei-Lin Ou
- Department of Biochemistry and Department of Molecular Genetics, University of Toronto, Toronto, Ontario M5S 1A8, Canada
| | - Aidin R. Balo
- Department of Biochemistry and Department of Molecular Genetics, University of Toronto, Toronto, Ontario M5S 1A8, Canada
| | - David
J. Kissick
- GM/CA
at Advanced Photon Source, Argonne National
Laboratory, Lemont, Illinois 60439, United States
| | - Craig M. Ogata
- GM/CA
at Advanced Photon Source, Argonne National
Laboratory, Lemont, Illinois 60439, United States
| | - Anling Kuo
- Department of Biochemistry and Department of Molecular Genetics, University of Toronto, Toronto, Ontario M5S 1A8, Canada
| | - Oliver P. Ernst
- Department of Biochemistry and Department of Molecular Genetics, University of Toronto, Toronto, Ontario M5S 1A8, Canada
- E-mail:
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38
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Sui S, Wang Y, Kolewe KW, Srajer V, Henning R, Schiffman JD, Dimitrakopoulos C, Perry SL. Graphene-based microfluidics for serial crystallography. LAB ON A CHIP 2016; 16:3082-96. [PMID: 27241728 PMCID: PMC4970872 DOI: 10.1039/c6lc00451b] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
Microfluidic strategies to enable the growth and subsequent serial crystallographic analysis of micro-crystals have the potential to facilitate both structural characterization and dynamic structural studies of protein targets that have been resistant to single-crystal strategies. However, adapting microfluidic crystallization platforms for micro-crystallography requires a dramatic decrease in the overall device thickness. We report a robust strategy for the straightforward incorporation of single-layer graphene into ultra-thin microfluidic devices. This architecture allows for a total material thickness of only ∼1 μm, facilitating on-chip X-ray diffraction analysis while creating a sample environment that is stable against significant water loss over several weeks. We demonstrate excellent signal-to-noise in our X-ray diffraction measurements using a 1.5 μs polychromatic X-ray exposure, and validate our approach via on-chip structure determination using hen egg white lysozyme (HEWL) as a model system. Although this work is focused on the use of graphene for protein crystallography, we anticipate that this technology should find utility in a wide range of both X-ray and other lab on a chip applications.
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Affiliation(s)
- Shuo Sui
- Department of Chemical Engineering, The University of Massachusetts Amherst, Amherst, MA 01003, USA.
| | - Yuxi Wang
- Department of Chemical Engineering, The University of Massachusetts Amherst, Amherst, MA 01003, USA.
| | - Kristopher W Kolewe
- Department of Chemical Engineering, The University of Massachusetts Amherst, Amherst, MA 01003, USA.
| | - Vukica Srajer
- BioCARS Center for Advanced Radiation Sources, The University of Chicago, Argonne, IL 60439, USA
| | - Robert Henning
- BioCARS Center for Advanced Radiation Sources, The University of Chicago, Argonne, IL 60439, USA
| | - Jessica D Schiffman
- Department of Chemical Engineering, The University of Massachusetts Amherst, Amherst, MA 01003, USA.
| | - Christos Dimitrakopoulos
- Department of Chemical Engineering, The University of Massachusetts Amherst, Amherst, MA 01003, USA.
| | - Sarah L Perry
- Department of Chemical Engineering, The University of Massachusetts Amherst, Amherst, MA 01003, USA.
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39
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Shen C, Julius EF, Tyree TJ, Moreau DW, Atakisi H, Thorne RE. Thermal contraction of aqueous glycerol and ethylene glycol solutions for optimized protein-crystal cryoprotection. Acta Crystallogr D Struct Biol 2016; 72:742-52. [PMID: 27303794 PMCID: PMC8493611 DOI: 10.1107/s2059798316005490] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2015] [Accepted: 04/01/2016] [Indexed: 11/10/2022] Open
Abstract
The thermal contraction of aqueous cryoprotectant solutions on cooling to cryogenic temperatures is of practical importance in protein cryocrystallography and in biological cryopreservation. In the former case, differential contraction on cooling of protein molecules and their lattice relative to that of the internal and surrounding solvent may lead to crystal damage and the degradation of crystal diffraction properties. Here, the amorphous phase densities of aqueous solutions of glycerol and ethylene glycol at T = 77 K have been determined. Densities with accuracies of <0.5% to concentrations as low as 30%(w/v) were determined by rapidly cooling drops with volumes as small as 70 pl, assessing their optical clarity and measuring their buoyancy in liquid nitrogen-argon solutions. The use of these densities in contraction matching of internal solvent to the available solvent spaces is complicated by several factors, most notably the exclusion of cryoprotectants from protein hydration shells and the expected deviation of the contraction behavior of hydration water from bulk water. The present methods and results will assist in developing rational approaches to cryoprotection and an understanding of solvent behavior in protein crystals.
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Affiliation(s)
- Chen Shen
- Cornell University, Ithaca, NY 14853, USA
| | | | | | - David W. Moreau
- Physics Department, Cornell University, Ithaca, NY 14853, USA
| | - Hakan Atakisi
- Physics Department, Cornell University, Ithaca, NY 14853, USA
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40
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Owen RL, Sherrell DA. Radiation damage and derivatization in macromolecular crystallography: a structure factor's perspective. Acta Crystallogr D Struct Biol 2016; 72:388-94. [PMID: 26960125 PMCID: PMC4784669 DOI: 10.1107/s2059798315021555] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2015] [Accepted: 11/13/2015] [Indexed: 11/11/2022] Open
Abstract
During, or even after, data collection the presence and effects of radiation damage in macromolecular crystallography may not always be immediately obvious. Despite this, radiation damage is almost always present, with site-specific damage occurring on very short time (dose) scales well before global damage becomes apparent. A result of both site-specific radiation damage and derivatization is a change in the relative intensity of reflections. The size and approximate rate of onset of X-ray-induced transformations is compared with the changes expected from derivatization, and strategies for minimizing radiation damage are discussed.
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Affiliation(s)
- Robin L. Owen
- Diamond Light Source, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0DE, England
| | - Darren A. Sherrell
- Diamond Light Source, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0DE, England
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41
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Huang CY, Olieric V, Ma P, Howe N, Vogeley L, Liu X, Warshamanage R, Weinert T, Panepucci E, Kobilka B, Diederichs K, Wang M, Caffrey M. In meso in situ serial X-ray crystallography of soluble and membrane proteins at cryogenic temperatures. Acta Crystallogr D Struct Biol 2016; 72:93-112. [PMID: 26894538 PMCID: PMC4756617 DOI: 10.1107/s2059798315021683] [Citation(s) in RCA: 88] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2015] [Accepted: 11/15/2015] [Indexed: 11/21/2022] Open
Abstract
Here, a method for presenting crystals of soluble and membrane proteins growing in the lipid cubic or sponge phase for in situ diffraction data collection at cryogenic temperatures is introduced. The method dispenses with the need for the technically demanding and inefficient crystal-harvesting step that is an integral part of the lipid cubic phase or in meso method of growing crystals. Crystals are dispersed in a bolus of mesophase sandwiched between thin plastic windows. The bolus contains tens to hundreds of crystals, visible with an in-line microscope at macromolecular crystallography synchrotron beamlines and suitably disposed for conventional or serial crystallographic data collection. Wells containing the crystal-laden boluses are removed individually from hermetically sealed glass plates in which crystallization occurs, affixed to pins on goniometer bases and excess precipitant is removed from around the mesophase. The wells are snap-cooled in liquid nitrogen, stored and shipped in Dewars, and manually or robotically mounted on a goniometer in a cryostream for diffraction data collection at 100 K, as is performed routinely with standard, loop-harvested crystals. The method is a variant on the recently introduced in meso in situ serial crystallography (IMISX) method that enables crystallographic measurements at cryogenic temperatures where crystal lifetimes are enormously enhanced whilst reducing protein consumption dramatically. The new approach has been used to generate high-resolution crystal structures of a G-protein-coupled receptor, α-helical and β-barrel transporters and an enzyme as model integral membrane proteins. Insulin and lysozyme were used as test soluble proteins. The quality of the data that can be generated by this method was attested to by performing sulfur and bromine SAD phasing with two of the test proteins.
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Affiliation(s)
- Chia-Ying Huang
- Membrane Structural and Functional Biology Group, School of Medicine and School of Biochemistry and Immunology, Trinity College, Dublin 2, D02 R590, Ireland
| | - Vincent Olieric
- Swiss Light Source, Paul Scherrer Institute, CH-5232 Villigen, Switzerland
| | - Pikyee Ma
- Membrane Structural and Functional Biology Group, School of Medicine and School of Biochemistry and Immunology, Trinity College, Dublin 2, D02 R590, Ireland
- Laboratory of Structure and Function of Biological Membranes, Center for Structural Biology and Bioinformatics, Université Libre de Bruxelles, 1050 Brussels, Belgium
| | - Nicole Howe
- Membrane Structural and Functional Biology Group, School of Medicine and School of Biochemistry and Immunology, Trinity College, Dublin 2, D02 R590, Ireland
| | - Lutz Vogeley
- Membrane Structural and Functional Biology Group, School of Medicine and School of Biochemistry and Immunology, Trinity College, Dublin 2, D02 R590, Ireland
| | - Xiangyu Liu
- School of Medicine, Tsinghua University, Beijing 100084, People’s Republic of China
| | | | - Tobias Weinert
- Swiss Light Source, Paul Scherrer Institute, CH-5232 Villigen, Switzerland
| | - Ezequiel Panepucci
- Swiss Light Source, Paul Scherrer Institute, CH-5232 Villigen, Switzerland
| | - Brian Kobilka
- School of Medicine, Tsinghua University, Beijing 100084, People’s Republic of China
- Department of Molecular and Cellular Physiology, Stanford University School of Medicine, Stanford, CA 94305, USA
| | - Kay Diederichs
- Fachbereich Biologie, Universität Konstanz, Box 647, D-78457 Konstanz, Germany
| | - Meitian Wang
- Swiss Light Source, Paul Scherrer Institute, CH-5232 Villigen, Switzerland
| | - Martin Caffrey
- Membrane Structural and Functional Biology Group, School of Medicine and School of Biochemistry and Immunology, Trinity College, Dublin 2, D02 R590, Ireland
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Keedy DA, Kenner LR, Warkentin M, Woldeyes RA, Hopkins JB, Thompson MC, Brewster AS, Van Benschoten AH, Baxter EL, Uervirojnangkoorn M, McPhillips SE, Song J, Alonso-Mori R, Holton JM, Weis WI, Brunger AT, Soltis SM, Lemke H, Gonzalez A, Sauter NK, Cohen AE, van den Bedem H, Thorne RE, Fraser JS. Mapping the conformational landscape of a dynamic enzyme by multitemperature and XFEL crystallography. eLife 2015; 4. [PMID: 26422513 PMCID: PMC4721965 DOI: 10.7554/elife.07574] [Citation(s) in RCA: 117] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2015] [Accepted: 09/29/2015] [Indexed: 12/14/2022] Open
Abstract
Determining the interconverting conformations of dynamic proteins in atomic detail is a major challenge for structural biology. Conformational heterogeneity in the active site of the dynamic enzyme cyclophilin A (CypA) has been previously linked to its catalytic function, but the extent to which the different conformations of these residues are correlated is unclear. Here we compare the conformational ensembles of CypA by multitemperature synchrotron crystallography and fixed-target X-ray free-electron laser (XFEL) crystallography. The diffraction-before-destruction nature of XFEL experiments provides a radiation-damage-free view of the functionally important alternative conformations of CypA, confirming earlier synchrotron-based results. We monitored the temperature dependences of these alternative conformations with eight synchrotron datasets spanning 100-310 K. Multiconformer models show that many alternative conformations in CypA are populated only at 240 K and above, yet others remain populated or become populated at 180 K and below. These results point to a complex evolution of conformational heterogeneity between 180-–240 K that involves both thermal deactivation and solvent-driven arrest of protein motions in the crystal. The lack of a single shared conformational response to temperature within the dynamic active-site network provides evidence for a conformation shuffling model, in which exchange between rotamer states of a large aromatic ring in the middle of the network shifts the conformational ensemble for the other residues in the network. Together, our multitemperature analyses and XFEL data motivate a new generation of temperature- and time-resolved experiments to structurally characterize the dynamic underpinnings of protein function. DOI:http://dx.doi.org/10.7554/eLife.07574.001 Proteins are the workhorses of the cell. The shape that a protein molecule adopts enables it to carry out its role. However, a protein’s shape, or 'conformation', is not static. Instead, a protein can shift between different conformations. This is particularly true for enzymes – the proteins that catalyze chemical reactions. The region of an enzyme where the chemical reaction happens, known as the active site, often has to change its conformation to allow catalysis to proceed. Changes in temperature can also make a protein shift between alternative conformations. Understanding how a protein shifts between conformations gives insight into how it works. A common method for studying protein conformation is X-ray crystallography. This technique uses a beam of X-rays to figure out where the atoms of the protein are inside a crystal made of millions of copies of that protein. At room temperature or biological temperature, X-rays can rapidly damage the protein. Because of this, most crystal structures are determined at very low temperatures to minimize damage. But cooling to low temperatures changes the conformations that the protein adopts, and usually causes fewer conformations to be present. Keedy, Kenner, Warkentin, Woldeyes et al. have used X-ray crystallography from a very low temperature (-173°C or 100 K) to above room temperature (up to 27°C or 300 K) to explore the alternative conformations of an enzyme called cyclophilin A. These alternative conformations include those that have previously been linked to this enzyme’s activity. Starting at a low temperature, parts of the enzyme were seen to shift from having a single conformation to many conformations above a threshold temperature. Unexpectedly, different parts of the enzyme have different threshold temperatures, suggesting that there isn’t a single transition across the whole protein. Instead, it appears the way a protein’s conformation changes in response to temperature is more complex than was previously realized. This result suggests that conformations in different parts of a protein are coupled to each other in complex ways. Keedy, Kenner, Warkentin, Woldeyes et al. then performed X-ray crystallography at room temperature using an X-ray free-electron laser (XFEL). This technique can capture the protein’s structure before radiation damage occurs, and confirmed that the alternative conformations observed were not affected by radiation damage. The combination of X-ray crystallography at multiple temperatures, new analysis methods for identifying and measuring alternative conformations, and XFEL crystallography should help future studies to characterize conformational changes in other proteins. DOI:http://dx.doi.org/10.7554/eLife.07574.002
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Affiliation(s)
- Daniel A Keedy
- Department of Bioengineering and Therapeutic Sciences, University of California, San Francisco, San Francisco, United States
| | - Lillian R Kenner
- Department of Bioengineering and Therapeutic Sciences, University of California, San Francisco, San Francisco, United States
| | | | - Rahel A Woldeyes
- Department of Bioengineering and Therapeutic Sciences, University of California, San Francisco, San Francisco, United States
| | - Jesse B Hopkins
- Department of Physics, Cornell University, Ithaca, United States
| | - Michael C Thompson
- Department of Bioengineering and Therapeutic Sciences, University of California, San Francisco, San Francisco, United States
| | - Aaron S Brewster
- Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, United States
| | - Andrew H Van Benschoten
- Department of Bioengineering and Therapeutic Sciences, University of California, San Francisco, San Francisco, United States
| | - Elizabeth L Baxter
- Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, United States
| | - Monarin Uervirojnangkoorn
- Department of Molecular and Cellular Physiology, Stanford University, Stanford, United States.,Howard Hughes Medical Institute, Stanford University, Stanford, United States
| | - Scott E McPhillips
- Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, United States
| | - Jinhu Song
- Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, United States
| | - Roberto Alonso-Mori
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, United States
| | - James M Holton
- Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, United States.,Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, United States.,Department of Biochemistry and Biophysics, University of California, San Francisco, San Francisco, United States
| | - William I Weis
- Department of Molecular and Cellular Physiology, Stanford University, Stanford, United States.,Department of Structural Biology, Stanford University, Stanford, United States.,Department of Photon Science, SLAC National Accelerator Laboratory, Menlo Park, United States
| | - Axel T Brunger
- Department of Molecular and Cellular Physiology, Stanford University, Stanford, United States.,Howard Hughes Medical Institute, Stanford University, Stanford, United States.,Department of Structural Biology, Stanford University, Stanford, United States.,Department of Photon Science, SLAC National Accelerator Laboratory, Menlo Park, United States
| | - S Michael Soltis
- Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, United States
| | - Henrik Lemke
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, United States
| | - Ana Gonzalez
- Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, United States
| | - Nicholas K Sauter
- Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, United States
| | - Aina E Cohen
- Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, United States
| | - Henry van den Bedem
- Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, United States
| | - Robert E Thorne
- Department of Physics, Cornell University, Ithaca, United States
| | - James S Fraser
- Department of Bioengineering and Therapeutic Sciences, University of California, San Francisco, San Francisco, United States
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43
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Pawate AS, Šrajer V, Schieferstein J, Guha S, Henning R, Kosheleva I, Schmidt M, Ren Z, Kenis PJA, Perry SL. Towards time-resolved serial crystallography in a microfluidic device. Acta Crystallogr F Struct Biol Commun 2015; 71:823-30. [PMID: 26144226 PMCID: PMC4498702 DOI: 10.1107/s2053230x15009061] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2015] [Accepted: 05/11/2015] [Indexed: 11/10/2022] Open
Abstract
Serial methods for crystallography have the potential to enable dynamic structural studies of protein targets that have been resistant to single-crystal strategies. The use of serial data-collection strategies can circumvent challenges associated with radiation damage and repeated reaction initiation. This work utilizes a microfluidic crystallization platform for the serial time-resolved Laue diffraction analysis of macroscopic crystals of photoactive yellow protein (PYP). Reaction initiation was achieved via pulsed laser illumination, and the resultant electron-density difference maps clearly depict the expected pR(1)/pR(E46Q) and pR(2)/pR(CW) states at 10 µs and the pB1 intermediate at 1 ms. The strategies presented here have tremendous potential for extension to chemical triggering methods for reaction initiation and for extension to dynamic, multivariable analyses.
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Affiliation(s)
- Ashtamurthy S. Pawate
- Department of Chemical and Biomolecular Engineering, The University of Illinois at Urbana-Champaign, Urbana, Illinois, USA
| | - Vukica Šrajer
- Center for Advanced Radiation Sources, The University of Chicago, Argonne, Illinois, USA
| | - Jeremy Schieferstein
- Department of Chemical and Biomolecular Engineering, The University of Illinois at Urbana-Champaign, Urbana, Illinois, USA
| | - Sudipto Guha
- Department of Chemical and Biomolecular Engineering, The University of Illinois at Urbana-Champaign, Urbana, Illinois, USA
| | - Robert Henning
- Center for Advanced Radiation Sources, The University of Chicago, Argonne, Illinois, USA
| | - Irina Kosheleva
- Center for Advanced Radiation Sources, The University of Chicago, Argonne, Illinois, USA
| | - Marius Schmidt
- Department of Physics, The University of Wisconsin Milwaukee, Milwaukee, Wisconsin, USA
| | - Zhong Ren
- Center for Advanced Radiation Sources, The University of Chicago, Argonne, Illinois, USA
- Renz Research Inc., Westmont, Illinois, USA
| | - Paul J. A. Kenis
- Department of Chemical and Biomolecular Engineering, The University of Illinois at Urbana-Champaign, Urbana, Illinois, USA
| | - Sarah L. Perry
- Department of Chemical and Biomolecular Engineering, The University of Illinois at Urbana-Champaign, Urbana, Illinois, USA
- Department of Chemical Engineering, The University of Massachusetts Amherst, Amherst, Massachusetts, USA
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44
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Huang CY, Olieric V, Ma P, Panepucci E, Diederichs K, Wang M, Caffrey M. In meso in situ serial X-ray crystallography of soluble and membrane proteins. ACTA CRYSTALLOGRAPHICA. SECTION D, BIOLOGICAL CRYSTALLOGRAPHY 2015; 71:1238-56. [PMID: 26057665 PMCID: PMC4461204 DOI: 10.1107/s1399004715005210] [Citation(s) in RCA: 95] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/30/2015] [Accepted: 03/13/2015] [Indexed: 11/21/2022]
Abstract
The lipid cubic phase (LCP) continues to grow in popularity as a medium in which to generate crystals of membrane (and soluble) proteins for high-resolution X-ray crystallographic structure determination. To date, the PDB includes 227 records attributed to the LCP or in meso method. Among the listings are some of the highest profile membrane proteins, including the β2-adrenoreceptor-Gs protein complex that figured in the award of the 2012 Nobel Prize in Chemistry to Lefkowitz and Kobilka. The most successful in meso protocol to date uses glass sandwich crystallization plates. Despite their many advantages, glass plates are challenging to harvest crystals from. However, performing in situ X-ray diffraction measurements with these plates is not practical. Here, an alternative approach is described that provides many of the advantages of glass plates and is compatible with high-throughput in situ measurements. The novel in meso in situ serial crystallography (IMISX) method introduced here has been demonstrated with AlgE and PepT (alginate and peptide transporters, respectively) as model integral membrane proteins and with lysozyme as a test soluble protein. Structures were solved by molecular replacement and by experimental phasing using bromine SAD and native sulfur SAD methods to resolutions ranging from 1.8 to 2.8 Å using single-digit microgram quantities of protein. That sulfur SAD phasing worked is testament to the exceptional quality of the IMISX diffraction data. The IMISX method is compatible with readily available, inexpensive materials and equipment, is simple to implement and is compatible with high-throughput in situ serial data collection at macromolecular crystallography synchrotron beamlines worldwide. Because of its simplicity and effectiveness, the IMISX approach is likely to supplant existing in meso crystallization protocols. It should prove particularly attractive in the area of ligand screening for drug discovery and development.
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Affiliation(s)
- Chia-Ying Huang
- Membrane Structural and Functional Biology Group, Schools of Medicine and Biochemistry and Immunology, Trinity College, Dublin, Ireland
| | - Vincent Olieric
- Swiss Light Source, Paul Scherrer Institute, CH-5232 Villigen, Switzerland
| | - Pikyee Ma
- Membrane Structural and Functional Biology Group, Schools of Medicine and Biochemistry and Immunology, Trinity College, Dublin, Ireland
| | - Ezequiel Panepucci
- Swiss Light Source, Paul Scherrer Institute, CH-5232 Villigen, Switzerland
| | - Kay Diederichs
- Fachbereich Biologie, Universität Konstanz, M647, D-78457 Konstanz, Germany
| | - Meitian Wang
- Swiss Light Source, Paul Scherrer Institute, CH-5232 Villigen, Switzerland
| | - Martin Caffrey
- Membrane Structural and Functional Biology Group, Schools of Medicine and Biochemistry and Immunology, Trinity College, Dublin, Ireland
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45
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Pflugrath JW. Practical macromolecular cryocrystallography. ACTA CRYSTALLOGRAPHICA SECTION F-STRUCTURAL BIOLOGY COMMUNICATIONS 2015; 71:622-42. [PMID: 26057787 PMCID: PMC4461322 DOI: 10.1107/s2053230x15008304] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/08/2015] [Accepted: 04/27/2015] [Indexed: 11/10/2022]
Abstract
Current methods, reagents and experimental hardware for successfully and reproducibly flash-cooling macromolecular crystals to cryogenic temperatures for X-ray diffraction data collection are reviewed. Cryocrystallography is an indispensable technique that is routinely used for single-crystal X-ray diffraction data collection at temperatures near 100 K, where radiation damage is mitigated. Modern procedures and tools to cryoprotect and rapidly cool macromolecular crystals with a significant solvent fraction to below the glass-transition phase of water are reviewed. Reagents and methods to help prevent the stresses that damage crystals when flash-cooling are described. A method of using isopentane to assess whether cryogenic temperatures have been preserved when dismounting screened crystals is also presented.
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Affiliation(s)
- J W Pflugrath
- Rigaku Americas Corp., 9009 New Trails Drive, The Woodlands, TX 77381, USA
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46
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Price SWT, Ignatyev K, Geraki K, Basham M, Filik J, Vo NT, Witte PT, Beale AM, Mosselmans JFW. Chemical imaging of single catalyst particles with scanning μ-XANES-CT and μ-XRF-CT. Phys Chem Chem Phys 2015; 17:521-9. [PMID: 25407850 DOI: 10.1039/c4cp04488f] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The physicochemical state of a catalyst is a key factor in determining both activity and selectivity; however these materials are often not structurally or compositionally homogeneous. Here we report on the 3-dimensional imaging of an industrial catalyst, Mo-promoted colloidal Pt supported on carbon. The distribution of both the active Pt species and Mo promoter have been mapped over a single particle of catalyst using microfocus X-ray fluorescence computed tomography. X-ray absorption near edge spectroscopy (XANES) and extended X-ray absorption fine structure revealed a mixed local coordination environment, including the presence of both metallic Pt clusters and Pt chloride species, but also no direct interaction between the catalyst and Mo promoter. We also report on the benefits of scanning μ-XANES computed tomography for chemical imaging, allowing for 2- and 3-dimensional mapping of the local electronic and geometric environment, in this instance for both the Pt catalyst and Mo promoter throughout the catalyst particle.
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Affiliation(s)
- S W T Price
- Science Division, Diamond Light Source, Harwell Science and Innovation Campus, Didcot, Oxon, OX11 0DE, UK.
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47
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Liebschner D, Rosenbaum G, Dauter M, Dauter Z. Radiation decay of thaumatin crystals at three X-ray energies. ACTA CRYSTALLOGRAPHICA. SECTION D, BIOLOGICAL CRYSTALLOGRAPHY 2015; 71:772-8. [PMID: 25849388 PMCID: PMC4388262 DOI: 10.1107/s1399004715001030] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/28/2014] [Accepted: 01/17/2015] [Indexed: 11/10/2022]
Abstract
Radiation damage is an unavoidable obstacle in X-ray crystallographic data collection for macromolecular structure determination, so it is important to know how much radiation a sample can endure before being degraded beyond an acceptable limit. In the literature, the threshold at which the average intensity of all recorded reflections decreases to a certain fraction of the initial value is called the `dose limit'. The first estimated D50 dose-limit value, at which the average diffracted intensity was reduced to 50%, was 20 MGy and was derived from observing sample decay in electron-diffraction experiments. A later X-ray study carried out at 100 K on ferritin protein crystals arrived at a D50 of 43 MGy, and recommended an intensity reduction of protein reflections to 70%, D70, corresponding to an absorbed dose of 30 MGy, as a more appropriate limit for macromolecular crystallography. In the macromolecular crystallography community, the rate of intensity decay with dose was then assumed to be similar for all protein crystals. A series of diffraction images of cryocooled (100 K) thaumatin crystals at identical small, 2° rotation intervals were recorded at X-ray energies of 6.33 , 12.66 and 19.00 keV. Five crystals were used for each wavelength. The decay in the average diffraction intensity to 70% of the initial value, for data extending to 2.45 Å resolution, was determined to be about 7.5 MGy at 6.33 keV and about 11 MGy at the two higher energies.
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Affiliation(s)
- Dorothee Liebschner
- Structural Biology Research Center, Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization, Tsukuba, Japan
| | - Gerold Rosenbaum
- Department of Biochemistry, University of Georgia and Structural Biology Center, Argonne National Laboratory, Argonne, IL 60439, USA
| | - Miroslawa Dauter
- Leidos Biomedical Research Inc., Basic Science Program, Argonne National Laboratory, Argonne, IL 60439, USA
| | - Zbigniew Dauter
- Synchrotron Radiation Research Section, MCL, National Cancer Institute, Argonne National Laboratory, Argonne, IL 60439, USA
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48
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49
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Nogly P, James D, Wang D, White TA, Zatsepin N, Shilova A, Nelson G, Liu H, Johansson L, Heymann M, Jaeger K, Metz M, Wickstrand C, Wu W, Båth P, Berntsen P, Oberthuer D, Panneels V, Cherezov V, Chapman H, Schertler G, Neutze R, Spence J, Moraes I, Burghammer M, Standfuss J, Weierstall U. Lipidic cubic phase serial millisecond crystallography using synchrotron radiation. IUCRJ 2015; 2:168-76. [PMID: 25866654 PMCID: PMC4392771 DOI: 10.1107/s2052252514026487] [Citation(s) in RCA: 153] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/16/2014] [Accepted: 12/01/2014] [Indexed: 05/19/2023]
Abstract
Lipidic cubic phases (LCPs) have emerged as successful matrixes for the crystallization of membrane proteins. Moreover, the viscous LCP also provides a highly effective delivery medium for serial femtosecond crystallography (SFX) at X-ray free-electron lasers (XFELs). Here, the adaptation of this technology to perform serial millisecond crystallography (SMX) at more widely available synchrotron microfocus beamlines is described. Compared with conventional microcrystallography, LCP-SMX eliminates the need for difficult handling of individual crystals and allows for data collection at room temperature. The technology is demonstrated by solving a structure of the light-driven proton-pump bacteriorhodopsin (bR) at a resolution of 2.4 Å. The room-temperature structure of bR is very similar to previous cryogenic structures but shows small yet distinct differences in the retinal ligand and proton-transfer pathway.
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Affiliation(s)
- Przemyslaw Nogly
- Laboratory for Biomolecular Research, Paul Scherrer Institute, Villigen 5232, Switzerland
| | - Daniel James
- Department of Physics, Arizona State University, Tempe, AZ 85287, USA
| | - Dingjie Wang
- Department of Physics, Arizona State University, Tempe, AZ 85287, USA
| | - Thomas A. White
- Center for Free-Electron Laser Science, Deutsches Elektronen-Synchrotron DESY, Hamburg 22607, Germany
| | - Nadia Zatsepin
- Department of Physics, Arizona State University, Tempe, AZ 85287, USA
| | - Anastasya Shilova
- European Synchrotron Radiation Facility, Grenoble Cedex 9, F-38043, France
| | - Garrett Nelson
- Department of Physics, Arizona State University, Tempe, AZ 85287, USA
| | - Haiguang Liu
- Department of Physics, Arizona State University, Tempe, AZ 85287, USA
| | - Linda Johansson
- Department of Integrative Structural and Computational Biology, Scripps Research Institute, La Jolla, California USA
| | - Michael Heymann
- Center for Free-Electron Laser Science, Deutsches Elektronen-Synchrotron DESY, Hamburg 22607, Germany
| | - Kathrin Jaeger
- Laboratory for Biomolecular Research, Paul Scherrer Institute, Villigen 5232, Switzerland
| | - Markus Metz
- Center for Free-Electron Laser Science, Deutsches Elektronen-Synchrotron DESY, Hamburg 22607, Germany
- Centre for Ultrafast Imaging, Hamburg 22607, Germany
| | - Cecilia Wickstrand
- Department of Chemistry and Molecular Biology, University of Gothenburg, Gothenburg, Sweden
| | - Wenting Wu
- Laboratory for Biomolecular Research, Paul Scherrer Institute, Villigen 5232, Switzerland
| | - Petra Båth
- Department of Chemistry and Molecular Biology, University of Gothenburg, Gothenburg, Sweden
| | - Peter Berntsen
- Department of Chemistry and Molecular Biology, University of Gothenburg, Gothenburg, Sweden
| | - Dominik Oberthuer
- Center for Free-Electron Laser Science, Deutsches Elektronen-Synchrotron DESY, Hamburg 22607, Germany
- Centre for Ultrafast Imaging, Hamburg 22607, Germany
| | - Valerie Panneels
- Laboratory for Biomolecular Research, Paul Scherrer Institute, Villigen 5232, Switzerland
| | - Vadim Cherezov
- Department of Integrative Structural and Computational Biology, Scripps Research Institute, La Jolla, California USA
| | - Henry Chapman
- Center for Free-Electron Laser Science, Deutsches Elektronen-Synchrotron DESY, Hamburg 22607, Germany
- Department of Physics, University of Hamburg, Hamburg 22607, Germany
| | - Gebhard Schertler
- Laboratory for Biomolecular Research, Paul Scherrer Institute, Villigen 5232, Switzerland
- Deparment of Biology, ETH Zurich, Zürich 8093, Switzerland
| | - Richard Neutze
- Department of Chemistry and Molecular Biology, University of Gothenburg, Gothenburg, Sweden
| | - John Spence
- Department of Physics, Arizona State University, Tempe, AZ 85287, USA
| | - Isabel Moraes
- Membrane Protein Laboratory, Diamond Light Source, Harwell Science and Innovation Campus, Chilton, Oxfordshire OX11 0DE, England
- Department of Life Sciences, Imperial College London, London, England
- Research Complex at Harwell Rutherford, Appleton Laboratory, Harwell, Didcot, Oxfordshire OX11 0FA, England
| | - Manfred Burghammer
- European Synchrotron Radiation Facility, Grenoble Cedex 9, F-38043, France
- Department of Analytical Chemistry, Ghent University, Ghent B-9000, Belgium
| | - Joerg Standfuss
- Laboratory for Biomolecular Research, Paul Scherrer Institute, Villigen 5232, Switzerland
| | - Uwe Weierstall
- Department of Physics, Arizona State University, Tempe, AZ 85287, USA
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Botha S, Nass K, Barends TRM, Kabsch W, Latz B, Dworkowski F, Foucar L, Panepucci E, Wang M, Shoeman RL, Schlichting I, Doak RB. Room-temperature serial crystallography at synchrotron X-ray sources using slowly flowing free-standing high-viscosity microstreams. ACTA ACUST UNITED AC 2015; 71:387-97. [DOI: 10.1107/s1399004714026327] [Citation(s) in RCA: 159] [Impact Index Per Article: 17.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2014] [Accepted: 11/30/2014] [Indexed: 11/10/2022]
Abstract
Recent advances in synchrotron sources, beamline optics and detectors are driving a renaissance in room-temperature data collection. The underlying impetus is the recognition that conformational differences are observed in functionally important regions of structures determined using crystals kept at ambient as opposed to cryogenic temperature during data collection. In addition, room-temperature measurements enable time-resolved studies and eliminate the need to find suitable cryoprotectants. Since radiation damage limits the high-resolution data that can be obtained from a single crystal, especially at room temperature, data are typically collected in a serial fashion using a number of crystals to spread the total dose over the entire ensemble. Several approaches have been developed over the years to efficiently exchange crystals for room-temperature data collection. These includein situcollection in trays, chips and capillary mounts. Here, the use of a slowly flowing microscopic stream for crystal delivery is demonstrated, resulting in extremely high-throughput delivery of crystals into the X-ray beam. This free-stream technology, which was originally developed for serial femtosecond crystallography at X-ray free-electron lasers, is here adapted to serial crystallography at synchrotrons. By embedding the crystals in a high-viscosity carrier stream, high-resolution room-temperature studies can be conducted at atmospheric pressure using the unattenuated X-ray beam, thus permitting the analysis of small or weakly scattering crystals. The high-viscosity extrusion injector is described, as is its use to collect high-resolution serial data from native and heavy-atom-derivatized lysozyme crystals at the Swiss Light Source using less than half a milligram of protein crystals. The room-temperature serial data allowde novostructure determination. The crystal size used in this proof-of-principle experiment was dictated by the available flux density. However, upcoming developments in beamline optics, detectors and synchrotron sources will enable the use of true microcrystals. This high-throughput, high-dose-rate methodology provides a new route to investigating the structure and dynamics of macromolecules at ambient temperature.
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