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Journal Articles

Structure of a highly acidic -lactamase from the moderate halophile sp.560 and the discovery of a Cs $^{+}$ -selective binding site

Arai, Shigeki; Yonezawa, Yasushi*; Okazaki, Nobuo*; Matsumoto, Fumiko*; Shibazaki, Chie; Shimizu, Rumi; Yamada, Mitsugu*; Adachi, Motoyasu; Tamada, Taro; Kawamoto, Masahide*; et al.

Acta Crystallographica Section D, 71(3), p.541 - 554, 2015/03

https://doi.org/10.1107/S1399004714027734

Times Cited Count：7 Percentile：50.76(Biochemical Research Methods)

The crystal structure of halophilic -lactamase from sp.560 (HaBLA) was determined using X-ray crystallography. Moreover, the locations of bound Sr $^{2+}$ and Cs $^{+}$ ions were identified by anomalous X-ray diffraction. The location of one Cs $^{+}$ specific binding site was identified on HaBLA even in the presence of 9-fold molar excess of Na $^{+}$ (90 mM Na $^{+}$ /10 mM Cs $^{+}$ ). This Cs $^{+}$ binding site is formed by two main-chain O atoms and an aromatic ring of a side chain of Trp. An aromatic ring of Trp interacts with Cs $^{+}$ by the cation- interaction. The observation of a selective and high-affinity Cs $^{+}$ binding site provides important information that is useful for designing artificial Cs $^{+}$ binding sites useful in bioremediation of radioactive isotopes.

Journal Articles

Relation between the structure and catalytic activity for automotive emissions; Use of X-ray anomalous dispersion effect

Mizuki, Junichiro; Nishihata, Yasuo; Tanaka, Hirohisa*

Nihon Kessho Gakkai-Shi, 45(3), p.203 - 208, 2003/06

https://doi.org/10.5940/jcrsj.45.203

The employment of the X-ray anomalous dispersion effect allows us to detect the change in structure of catalytic converters with the environment exposed. Here we show that palladium atoms in a perovskite crystal move into and out of the crystal by anomalous X-ray diffraction and absorption techniques. This movement of the precious metals plays an important role to keep the catalytic activity long-lived.

Journal Articles

Catalyst for auotomotive emissions control in next generation; Relation of the intelligent property to its structure

Mizuki, Junichiro; Nishihata, Yasuo; Tanaka, Hirohisa*

Genshiryoku eye, 49(3), p.36 - 39, 2003/03

http://ci.nii.ac.jp/naid/80015773116

We use X-ray diffraction and absorption to show that the perovskite-based Pd catalyst retains its high metal dispersion owing to structural responses to the fluctuations in exhaust-gas composition that occur in state-of-the-art petrol engines. We find that as the catalyst is cycled between oxidative and reductive atmospheres typically encounttered in exhaust gas, Pd reversibly moves into and out of the perovskite lattice. This movement appears to suppress the growth of metallic Pd particles, and hence explains the retention of high catalytic activity.

Journal Articles