Molecular mechanism of autocatalytic processing of γ-glutamyltranspeptidase
Molecular mechanism of autocatalytic processing of γ-glutamyltranspeptidase
批准号:
13660090
负责人:
SUZUKI Hideyuki
金额:
$2.3万
依托单位:
依托单位国家:
日本
项目类别:
Grant-in-Aid for Scientific Research (C)
财政年份:
2001
资助国家:
日本
项目状态:
已结题
起止时间:
2001 至 2002
中文摘要
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英文摘要
γ-Glutamyltranspeptidase is the key enzyme in glutathione metabolism and we previously presented evidence suggesting that it belongs to the N-terminal nucleophile hydrolase superfamily. Enzymatically active γ-glutamyltranspeptidase, which consists of one large subunit and one small subunit, is generated from an inactive common precursor through post-translational proteolytic processing. The processing mechanism for γ-glutamyltranspeptidase of Escherichia coli K-12 has been analyzed by means of in vitro studies using purified precursors. We here show that the processing of a precursor of γ-glutamyltranspeptidase is an intramolecular autocatalytic event and that the catalytic nucleophile for the processing reaction is the oxygen atom of the side-chain of Thr-391 (N-terminal residue of the small (β) subunit), which is also the nucleophile for the enzymatic reaction.
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H.Suzuki, H.Kumagai: "Autocatalytic processing of γ-glutamyltranspeptidase."J.Biol.Chem.. 277・45. 43536-43543 (2002)
H.Suzuki、H.Kumagai:“γ-谷氨酰转肽酶的自催化处理”。J.Biol.Chem.. 277・45(2002)。
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H. Suzuki, S. Izuka, N. Miyakawa, and H. Kumagai: "Enzymatic production of theanine, as "umami" component of tea, from glutamine and ethylamine with bacterial γ-glutamyltranspeptidase"Enzyme Microb. Technol.. 31(6). 884-889 (2002)
H. Suzuki、S. Izuka、N. Miyakawa 和 H. Kumagai:“用细菌 γ-谷氨酰转肽酶从谷氨酰胺和乙胺酶促生产茶氨酸,作为茶的“鲜味”成分”Enzyme Microb.. 31(6) )884-889(2002)。
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H.Suzuki, Y.Kajimoto, H.Kumagai: "Improvement of the bitter taste of amino acids through the transpeptidation reaction of bacterial γ-glutamyltranspeptidase"J. Agric. Food Chem.. 50(2). 313-318 (2002)
H.Suzuki,Y.Kajimoto,H.Kumagai:“通过细菌γ-谷氨酰转肽酶的转肽反应改善氨基酸的苦味”J.Agric. 50(2)。
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H.Suzuki, N.Miyakawa, H.Kumagai: "Enzymatic production of γ-L-glutamyltaurine through the transpeptidation reaction of γ-glutamyltranspeptidase from E. coli K-12"Enzyme and Microbial Technology. (in press). (2002)
H.Suzuki、N.Miyakawa、H.Kumagai:“通过大肠杆菌 K-12 的 γ-谷氨酰转肽酶的转肽反应酶促生产 γ-L-谷氨酰牛磺酸”(酶和微生物技术)(2002 年出版)。
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H.Suzuki, S.Izuka, N.Miyakawa, H.Kumagai: "Enzymatic production of theanine, an "umami" component of tea, from glutamine and ethylamine with bacterial γ-glutamyltranspeptidase"Enzyme Microb. Technol.. 31(6). 884-889 (2002)
H.Suzuki、S.Izuka、N.Miyakawa、H.Kumagai:“用细菌 γ-谷氨酰转肽酶从谷氨酰胺和乙胺酶促生产茶氨酸”,酶微生物技术.. 31(6) .884-889 (2002)
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