Analysis of oscillatory rocking curve by dynamical diffraction in protein crystals

作者：Suzuki Ryo; Koizumi Haruhiko; Hirano Keiichi; Kumasaka Takashi; Kojima Kenichi; Tachibana Masaru^*

来源：Proceedings of the National Academy of Sciences, 2018, 115(14): 3634-3639.

DOI：10.1073/pnas.1720098115

• protein crystal
• dynamical diffraction
• rocking curve
• glucose isomerase
• X-ray topography

High-quality protein crystals meant for structural analysis by X-ray diffraction have been grown by various methods. The observation of dynamical diffraction in protein crystals is an interesting topic because dynamical diffraction generally occurs in perfect crystals such as Si crystals. However, to our knowledge, there is no report yet on protein crystals showing clear dynamical diffraction. We wonder whether the perfection of protein crystals might still be low compared with that of high-quality Si crystals. Here, we present observations of the oscillatory profile of rocking curves for protein crystals such as glucose isomerase crystals. The oscillatory profiles are in good agreement with those predicted by the dynamical theory of diffraction. We demonstrate that dynamical diffraction occurs even in protein crystals. This suggests the possibility of the use of dynamical diffraction for the determination of the structure and charge density of proteins.

• 出版日期2018-4-3