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Structure‐factor analysis of femtosecond microdiffraction patterns from protein nanocrystals

Structure‐factor analysis of femtosecond microdiffraction patterns from protein nanocrystals A complete set of structure factors has been extracted from hundreds of thousands of femtosecond single‐shot X‐ray microdiffraction patterns taken from randomly oriented nanocrystals. The method of Monte Carlo integration over crystallite size and orientation was applied to experimental data from Photosystem I nanocrystals. This arrives at structure factors from many partial reflections without prior knowledge of the particle‐size distribution. The data were collected at the Linac Coherent Light Source (the first hard‐X‐ray laser user facility), to which was fitted a hydrated protein nanocrystal injector jet, according to the method of serial crystallography. The data are single `still' diffraction snapshots, each from a different nanocrystal with sizes ranging between 100 nm and 2 µm, so the angular width of Bragg peaks was dominated by crystal‐size effects. These results were compared with single‐crystal data recorded from large crystals of Photosystem I at the Advanced Light Source and the quality of the data was found to be similar. The implications for improving the efficiency of data collection by allowing the use of very small crystals, for radiation‐damage reduction and for time‐resolved diffraction studies at room temperature are discussed. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Acta Crystallographica Section A Foundations of Crystallography Wiley

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References (37)

Publisher
Wiley
Copyright
Copyright © 2011 Wiley Subscription Services, Inc., A Wiley Company
ISSN
0108-7673
eISSN
1600-5724
DOI
10.1107/S0108767310050981
pmid
21325716
Publisher site
See Article on Publisher Site

Abstract

A complete set of structure factors has been extracted from hundreds of thousands of femtosecond single‐shot X‐ray microdiffraction patterns taken from randomly oriented nanocrystals. The method of Monte Carlo integration over crystallite size and orientation was applied to experimental data from Photosystem I nanocrystals. This arrives at structure factors from many partial reflections without prior knowledge of the particle‐size distribution. The data were collected at the Linac Coherent Light Source (the first hard‐X‐ray laser user facility), to which was fitted a hydrated protein nanocrystal injector jet, according to the method of serial crystallography. The data are single `still' diffraction snapshots, each from a different nanocrystal with sizes ranging between 100 nm and 2 µm, so the angular width of Bragg peaks was dominated by crystal‐size effects. These results were compared with single‐crystal data recorded from large crystals of Photosystem I at the Advanced Light Source and the quality of the data was found to be similar. The implications for improving the efficiency of data collection by allowing the use of very small crystals, for radiation‐damage reduction and for time‐resolved diffraction studies at room temperature are discussed.

Journal

Acta Crystallographica Section A Foundations of CrystallographyWiley

Published: Jan 1, 2011

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