Novel Catalytic Activity of Nitrile Hydratase from Rhodococcus sp. N771(ENZYMOLOGY, PROTEIN ENGINEERING, AND ENZYME TECHNOLOGY)
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概要
- 論文の詳細を見る
Nitrile hydratase (NHase) from Rhodococcus sp. N771 is a non-heme iron enzyme catalyzing the hydration of various nitriles to the corresponding amides. We report a novel catalytic activity of NHase. When NHase was incubated with an large excess of commercially available isovaleronitrile, the charge transfer band from the sulfur ligand to the Fe atom shifted from 710nm to 820nm, but recovered within 4min. Similar UV-Vis absorption changes were observed after the addition of isobutylisonitrile (iBuNC), a major impurity in commercially available isovaleronitrile, suggesting that NHase catalyzes the conversion of iBuNC to other compounds. The reaction product was identified as isobutylamine (iBuNH_2) by liquid chromatography tandem mass spectrometry. NHase also converts t-butylisonitrile and 1, 1, 3, 3, -tetramethylbutylisonitrile to the corresponding amines. Kinetic analysis of the conversion of iBuNC to iBuNH_2 showed a K_m value comparable to that for nitriles, while the V_<max> value was more than 10^5 times smaller than that for methacrylonitrile. This is the first report suggesting that NHase is a bifunctional enzyme catalyzing a reaction other than the hydration of nitriles.
- 社団法人日本生物工学会の論文
- 2008-08-25
著者
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DOHMAE Naoshi
Biomolecular Characterization Team, RIKEN
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Yohda Masafumi
Department of Biotechnology and Life Science, Tokyo University of Agriculture and Technology
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Hashimoto Koichi
Department of Cardiology, The Jikei University School of Medicine
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Dohmae Naoshi
Biomolecular Characterization Team Riken
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中村 健道
理化学研究所物質構造解析チーム
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中村 健道
理研・バイオ解析
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中村 健道
三共・分析代謝研
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中村 健道
理化学研究所先端技術開発支援センターバイオ解析チーム
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中村 健道
理研
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中村 健道
分析代謝研究所
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KOSHINO Hiroyuki
Molecular Characterization Team, RIKEN
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KOSHINO Hiroyuki
RIKEN
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Maeda Mizuo
Maeda Bioengineering Laboratory Riken
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Yohda Masafumi
Department Of Biotechnology And Life Science Graduate School Of Engineering Tokyo University Of Agri
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Dohmae Naoshi
Biomolecular Characterization Division Riken
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Odaka Masafumi
Maeda Bioengineering Laboratory Riken:department Of Biotechnology And Life Science Graduate School O
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Taniguchi Kayoko
Department of Engineering, Saitama University
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Murata Kensuke
Department of Biotechnology and Life Science, Graduate School of Engineering, Tokyo University of Ag
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Murakami Yoshihiko
Maeda Bioengineering Laboratory, RIKEN
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Takahashi Shunya
Molecular Characterization Team, RIKEN
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Nakamura Takemichi
Biomolecular Characterization Team, RIKEN
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Hirose Takuji
Department of Engineering, Saitama University
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Koshino Hiroyuki
Molecular Characterization Characterization Center Riken(the Institute Of Physical And Chemical Rese
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Takahashi Shunya
Molecular Characterization Team Riken
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Murakami Yoshihiko
Maeda Bioengineering Laboratory Riken:(present Office)department Of Applied Chemistry Graduate Schoo
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Hirose Takuji
Department Of Applied Chemistry Faculty Of Engineering Saitama University
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Hirose Takuji
Department Of Engineering Saitama University
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Murata Kensuke
Department Of Biotechnology And Life Science Graduate School Of Engineering Tokyo University Of Agri
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中村 健道
理化学研究所先端技術開発支援センター
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Hashimoto Koichi
Department Of Biotechnology And Life Science Graduate School Of Engineering Tokyo University Of Agri
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Taniguchi Kayoko
Department Of Applied Chemistry Faculty Of Engineering Saitama University
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Taniguchi Kayoko
Department Of Engineering Saitama University:maeda Bioengineering Laboratory Riken:(present Office)e
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