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Gevorkov Y, Barty A, Brehm W, White TA, Tolstikova A, Wiedorn MO, Meents A, Grigat RR, Chapman HN, Yefanov O. pinkIndexer - a universal indexer for pink-beam X-ray and electron diffraction snapshots. Acta Crystallogr A Found Adv 2020; 76:121-131. [PMID: 32124850 PMCID: PMC7053222 DOI: 10.1107/s2053273319015559] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2019] [Accepted: 11/18/2019] [Indexed: 12/15/2022] Open
Abstract
A crystallographic indexing algorithm, pinkIndexer, is presented for the analysis of snapshot diffraction patterns. It can be used in a variety of contexts including measurements made with a monochromatic radiation source, a polychromatic source or with radiation of very short wavelength. As such, the algorithm is particularly suited to automated data processing for two emerging measurement techniques for macromolecular structure determination: serial pink-beam X-ray crystallography and serial electron crystallography, which until now lacked reliable programs for analyzing many individual diffraction patterns from crystals of uncorrelated orientation. The algorithm requires approximate knowledge of the unit-cell parameters of the crystal, but not the wavelengths associated with each Bragg spot. The use of pinkIndexer is demonstrated by obtaining 1005 lattices from a published pink-beam serial crystallography data set that had previously yielded 140 indexed lattices. Additionally, in tests on experimental serial crystallography diffraction data recorded with quasi-monochromatic X-rays and with electrons the algorithm indexed more patterns than other programs tested.
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Affiliation(s)
- Yaroslav Gevorkov
- Center for Free-Electron Laser Science, Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
- Vision Systems, Hamburg University of Technology, 21071 Hamburg, Germany
| | - Anton Barty
- Center for Free-Electron Laser Science, Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - Wolfgang Brehm
- Center for Free-Electron Laser Science, Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - Thomas A. White
- Center for Free-Electron Laser Science, Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - Aleksandra Tolstikova
- Center for Free-Electron Laser Science, Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
- Department of Physics, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
| | - Max O. Wiedorn
- Center for Free-Electron Laser Science, Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
- Department of Physics, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
- The Hamburg Center for Ultrafast Imaging, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
| | - Alke Meents
- Center for Free-Electron Laser Science, Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - Rolf-Rainer Grigat
- Vision Systems, Hamburg University of Technology, 21071 Hamburg, Germany
| | - Henry N. Chapman
- Center for Free-Electron Laser Science, Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
- Department of Physics, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
- The Hamburg Center for Ultrafast Imaging, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
| | - Oleksandr Yefanov
- Center for Free-Electron Laser Science, Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
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Gevorkov Y, Yefanov O, Barty A, White TA, Mariani V, Brehm W, Tolstikova A, Grigat RR, Chapman HN. XGANDALF - extended gradient descent algorithm for lattice finding. Acta Crystallogr A Found Adv 2019; 75:694-704. [PMID: 31475914 PMCID: PMC6718201 DOI: 10.1107/s2053273319010593] [Citation(s) in RCA: 53] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2019] [Accepted: 07/26/2019] [Indexed: 11/24/2022] Open
Abstract
Serial crystallography records still diffraction patterns from single, randomly oriented crystals, then merges data from hundreds or thousands of them to form a complete data set. To process the data, the diffraction patterns must first be indexed, equivalent to determining the orientation of each crystal. A novel automatic indexing algorithm is presented, which in tests usually gives significantly higher indexing rates than alternative programs currently available for this task. The algorithm does not require prior knowledge of the lattice parameters but can make use of that information if provided, and also allows indexing of diffraction patterns generated by several crystals in the beam. Cases with a small number of Bragg spots per pattern appear to particularly benefit from the new approach. The algorithm has been implemented and optimized for fast execution, making it suitable for real-time feedback during serial crystallography experiments. It is implemented in an open-source C++ library and distributed under the LGPLv3 licence. An interface to it has been added to the CrystFEL software suite.
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Affiliation(s)
- Yaroslav Gevorkov
- Center for Free-Electron Laser Science, Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
- Institute of Vision Systems, Hamburg University of Technology, Harburger Schloßstraße 20, 21079 Hamburg, Germany
| | - Oleksandr Yefanov
- Center for Free-Electron Laser Science, Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - Anton Barty
- Center for Free-Electron Laser Science, Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - Thomas A. White
- Center for Free-Electron Laser Science, Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - Valerio Mariani
- Center for Free-Electron Laser Science, Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - Wolfgang Brehm
- Center for Free-Electron Laser Science, Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - Aleksandra Tolstikova
- Center for Free-Electron Laser Science, Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
| | - Rolf-Rainer Grigat
- Institute of Vision Systems, Hamburg University of Technology, Harburger Schloßstraße 20, 21079 Hamburg, Germany
| | - Henry N. Chapman
- Center for Free-Electron Laser Science, Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany
- Department of Physics, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
- The Hamburg Center for Ultrafast Imaging, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
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White TA. Processing serial crystallography data with CrystFEL: a step-by-step guide. Acta Crystallogr D Struct Biol 2019; 75:219-233. [PMID: 30821710 PMCID: PMC6400257 DOI: 10.1107/s205979831801238x] [Citation(s) in RCA: 42] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/20/2018] [Accepted: 08/31/2018] [Indexed: 11/11/2022]
Abstract
A step-by-step guide to processing serial crystallography data from X-ray free-electron lasers and synchrotron sources using CrystFEL is provided. This article provides a step-by-step guide to the use of the CrystFEL software for processing serial crystallography data from an X-ray free-electron laser or a synchrotron light source. Whereas previous papers have described the theory and algorithms and their rationale, this paper describes the steps to be performed from a user perspective, including command-line examples.
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Affiliation(s)
- Thomas A White
- Center for Free-Electron Laser Science, Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, Hamburg, Germany
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Stellato F, Oberthür D, Liang M, Bean R, Gati C, Yefanov O, Barty A, Burkhardt A, Fischer P, Galli L, Kirian RA, Meyer J, Panneerselvam S, Yoon CH, Chervinskii F, Speller E, White TA, Betzel C, Meents A, Chapman HN. Room-temperature macromolecular serial crystallography using synchrotron radiation. IUCrJ 2014; 1:204-12. [PMID: 25075341 PMCID: PMC4107920 DOI: 10.1107/s2052252514010070] [Citation(s) in RCA: 124] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2013] [Accepted: 05/05/2014] [Indexed: 05/18/2023]
Abstract
A new approach for collecting data from many hundreds of thousands of microcrystals using X-ray pulses from a free-electron laser has recently been developed. Referred to as serial crystallography, diffraction patterns are recorded at a constant rate as a suspension of protein crystals flows across the path of an X-ray beam. Events that by chance contain single-crystal diffraction patterns are retained, then indexed and merged to form a three-dimensional set of reflection intensities for structure determination. This approach relies upon several innovations: an intense X-ray beam; a fast detector system; a means to rapidly flow a suspension of crystals across the X-ray beam; and the computational infrastructure to process the large volume of data. Originally conceived for radiation-damage-free measurements with ultrafast X-ray pulses, the same methods can be employed with synchrotron radiation. As in powder diffraction, the averaging of thousands of observations per Bragg peak may improve the ratio of signal to noise of low-dose exposures. Here, it is shown that this paradigm can be implemented for room-temperature data collection using synchrotron radiation and exposure times of less than 3 ms. Using lysozyme microcrystals as a model system, over 40 000 single-crystal diffraction patterns were obtained and merged to produce a structural model that could be refined to 2.1 Å resolution. The resulting electron density is in excellent agreement with that obtained using standard X-ray data collection techniques. With further improvements the method is well suited for even shorter exposures at future and upgraded synchrotron radiation facilities that may deliver beams with 1000 times higher brightness than they currently produce.
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Affiliation(s)
- Francesco Stellato
- Center for Free Electron Laser Science, DESY, Notkestrasse 85, Hamburg 22607, Germany
| | - Dominik Oberthür
- Center for Free Electron Laser Science, DESY, Notkestrasse 85, Hamburg 22607, Germany
- Institute of Biochemistry and Molecular Biology, University of Hamburg, Hamburg 22607, Germany
| | - Mengning Liang
- Center for Free Electron Laser Science, DESY, Notkestrasse 85, Hamburg 22607, Germany
| | - Richard Bean
- Center for Free Electron Laser Science, DESY, Notkestrasse 85, Hamburg 22607, Germany
| | - Cornelius Gati
- Center for Free Electron Laser Science, DESY, Notkestrasse 85, Hamburg 22607, Germany
| | - Oleksandr Yefanov
- Center for Free Electron Laser Science, DESY, Notkestrasse 85, Hamburg 22607, Germany
| | - Anton Barty
- Center for Free Electron Laser Science, DESY, Notkestrasse 85, Hamburg 22607, Germany
| | | | | | - Lorenzo Galli
- Center for Free Electron Laser Science, DESY, Notkestrasse 85, Hamburg 22607, Germany
- Department of Physics, University of Hamburg, Luruper Chaussee 149, Hamburg 22607, Germany
| | - Richard A. Kirian
- Center for Free Electron Laser Science, DESY, Notkestrasse 85, Hamburg 22607, Germany
| | - Jan Meyer
- Photon Science, DESY, Hamburg 22607, Germany
| | | | - Chun Hong Yoon
- Center for Free Electron Laser Science, DESY, Notkestrasse 85, Hamburg 22607, Germany
- European XFEL GmbH, Albert Einstein Ring 19, Hamburg 22761, Germany
| | - Fedor Chervinskii
- Moscow Institute of Physics and Technology, 141700 Moscow, Russian Federation
| | - Emily Speller
- Department of Physics, University of York, Heslington, York YO10 5DD, UK
| | - Thomas A. White
- Center for Free Electron Laser Science, DESY, Notkestrasse 85, Hamburg 22607, Germany
| | - Christian Betzel
- Institute of Biochemistry and Molecular Biology, University of Hamburg, Hamburg 22607, Germany
- Center for Ultrafast Imaging, Luruper Chaussee 149, Hamburg 22761, Germany
| | - Alke Meents
- Photon Science, DESY, Hamburg 22607, Germany
| | - Henry N. Chapman
- Center for Free Electron Laser Science, DESY, Notkestrasse 85, Hamburg 22607, Germany
- Department of Physics, University of Hamburg, Luruper Chaussee 149, Hamburg 22607, Germany
- Center for Ultrafast Imaging, Luruper Chaussee 149, Hamburg 22761, Germany
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White TA, Barty A, Stellato F, Holton JM, Kirian RA, Zatsepin NA, Chapman HN. Crystallographic data processing for free-electron laser sources. Acta Crystallogr D Biol Crystallogr 2013; 69:1231-40. [PMID: 23793149 PMCID: PMC3689526 DOI: 10.1107/s0907444913013620] [Citation(s) in RCA: 111] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/30/2012] [Accepted: 05/17/2013] [Indexed: 11/10/2022]
Abstract
A processing pipeline for diffraction data acquired using the `serial crystallography' methodology with a free-electron laser source is described with reference to the crystallographic analysis suite CrystFEL and the pre-processing program Cheetah. A detailed analysis of the nature and impact of indexing ambiguities is presented. Simulations of the Monte Carlo integration scheme, which accounts for the partially recorded nature of the diffraction intensities, are presented and show that the integration of partial reflections could be made to converge more quickly if the bandwidth of the X-rays were to be increased by a small amount or if a slight convergence angle were introduced into the incident beam.
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Affiliation(s)
- Thomas A White
- Center for Free-Electron Laser Science, DESY, Notkestrasse 85, 22607 Hamburg, Germany.
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