Catalytic cycle of cytochrome-c3 hydrogenase, a [NiFe]-enzyme, deduced from the structures of the enzyme and the enzyme mimic

Tatsuhiko Yagi, Seiji Ogo, Yoshiki Higuchi

    研究成果: Contribution to journalArticle査読

    7 被引用数 (Scopus)

    抄録

    Hydrogenases catalyze uptake and production of H2. Heterolytic cleavage of H2 bound on [NiFe]-hydrogenase (E) produces two unequal H species to form E:HaHb, where Ha and Hb behave differently. The structures of various states of the enzyme established by crystallography and spectroscopy were used to construct a catalytic cycle of the enzyme. The Ni-Fe center of the active enzyme has the Ni-Fe bridging site vacant. The enzyme is suggested to bind H2 either at Ni or Fe atom. In E:HaHb, Ha is considered to be a protein-bound hydron (proton or deuteron) at the entrance to the hydrophobic gas tunnel. The structure of a synthetic hydrogenase-mimic suggests Hb to be the 6th ligand to Fe. Two successive one-electron processes from E:HaHb complete the catalytic cycle of H2 uptake. The reverse of the cycle operates in the H2 production. The proposed catalytic cycle is consistent with the kinetic, crystallographic and spectroscopic studies.

    本文言語英語
    ページ(範囲)18543-18550
    ページ数8
    ジャーナルInternational Journal of Hydrogen Energy
    39
    32
    DOI
    出版ステータス出版済み - 10 31 2014

    All Science Journal Classification (ASJC) codes

    • 再生可能エネルギー、持続可能性、環境
    • 燃料技術
    • 凝縮系物理学
    • エネルギー工学および電力技術

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