Microscopic analyses of complexes formed in adsorbent for Mo and Zr separation chromatography

Abe, Ryoji*; Nagoshi, Kohei*; Arai, Tsuyoshi*; Watanabe, So; Sano, Yuichi; Matsuura, Haruaki*; Takagi, Hideaki*; Shimizu, Nobutaka*; Koka, Masashi*; Sato, Takahiro*

Nuclear Instruments and Methods in Physics Research B, 404, p.173 - 178, 2017/08

https://doi.org/10.1016/j.nimb.2017.02.082

Preparation of large crystals of photoactive yellow protein for neutron diffraction and high resolution crystal structure analysis

Yamaguchi, Shigeo*; Kamikubo, Hironari*; Shimizu, Nobutaka*; Yamazaki, Yoichi*; Imamoto, Yasushi*; Kataoka, Mikio

Photochemistry and Photobiology, 83(2), p.336 - 338, 2007/03

https://doi.org/10.1562/2006-07-23-RA-977

The exact positions of all the hydrogen atoms in photoactive yellow protein (PYP) is important for understanding the molecular mechanism of the photoreaction because the protonation/deprotonation of certain amino acid residues and rearrangements in the hydrogen bond network are involved in the conformational changes of PYP. Neutron crystallography is one of the most effective methods to determine the hydrogen positions. However, a large crystal is required for neutron crystallography because a neutron incident flux is quite limited. In addition, the crystal should be grown from heavy water to reduce the incoherent background from hydrogen. We prepared a large crystal of PYP (dimensions: 1.5 0.7 0.7 mm) for neutron crystallography using ammonium sulfate with sodium chloride. The obtained large crystal gave X-ray diffraction spots up to 0.84 . Although some of the hydrogen atoms could be observed in the high resolution X-ray crystal structure, functionally important hydrogen atoms were impossible to see, indicating the importance of neutron crystallography. Thus, we optimized the crystallization conditions with heavy water and successfully obtained neutron diffraction spots up to 2.1 with the crystal in DO.

Strucutral analysis of complexes formed in adsorbents for MA recovery

Watanabe, So; Sano, Yuichi; Arai, Tsuyoshi*; Matsuura, Haruaki*; Shimizu, Nobutaka*; Takagi, Hideaki*

no journal, , 

no abstracts in English