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矢野 直峰*; 山田 太郎*; 細谷 孝明*; 大原 高志; 田中 伊知朗*; 新村 信雄*; 日下 勝弘*
Acta Crystallographica Section D; Structural Biology (Internet), 74(11), p.1041 - 1052, 2018/11
被引用回数:13 パーセンタイル:73.67(Biochemical Research Methods)STARGazer is a data processing software for neutron time-of-flight (TOF) single-crystal diffraction data collected by the IBARAKI Biological Crystal Diffractometer (iBIX) at the Japan Proton Accelerator Research Complex (J-PARC). This software creates hkl intensity data from three-dimensional (x, y, TOF) diffraction data. STARGazer is composed of both a data processing component and a data visualization component. This article describes the status of data processing software STARGazer and its data processing algorithms.
茶竹 俊行*; 藤原 悟
Acta Crystallographica Section D; Structural Biology (Internet), 72(1), p.71 - 82, 2016/01
被引用回数:5 パーセンタイル:37.66(Biochemical Research Methods)A technique for the determination of the deuterium/hydrogen (D/H) contrast map in neutron macromolecular crystallography has been developed and evaluated using ribonuclease A. In this technique, the contrast map between the DO-solvent and HO-solvent crystals is calculated using subtraction in real space. The present technique can thus utilize all the amplitudes of the neutron structure factors for both of the DO-solvent and HO solvent crystals. The neutron D/H contrast maps clearly demonstrate powerful detectability of the H/D exchange in proteins. In fact, alternative protonation states and alternative conformations of hydroxyl groups are observed at a medium resolution (1.8 ). Moreover, water molecules can be categorized into three types according to their tendency for rotational disorder. These results directly indicate improvement in the neutron crystal structure analysis. Combination of this technique with the conventional neutron structure determination protocols thus makes more precise and efficient determination of the D atom positions in proteins possible.