Mechanism of Asymmetric Production of L-Aromatic Amino Acids from the Corresponding Hydantoins by Flavobacterium sp.(Microbiology & Fermentation Industry)
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概要
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The mechanism of asymmetric production of L-aromatic amino acids from the corresponding hydantoins by Flavobacterium sp. AJ-3912 was examined by investigating the properties of the enzymes involved in the hydrolysis of 5-substituted hydantoins corresponding to aromatic amino acids (AAH). The enzymatic hydrolysis of AAH by Flavobacterium sp. AJ-3912 consisted of the following two successive reactions; a hydrolytic ring opening reaction of DL-AAH to L- and D-form N-carbamyl aromatic amino acids (NCA), involving an enzyme (hydantoin hydrolase), followed by a hydrolytic cleaving reaction of the L-form NCA to L-aromatic amino acids involving another enzyme (N-carbamyl-L-aromatic amino acid hydrolase, abbreviated as L-NCA hydrolase). The ring opening reaction involving hydantoin hydrolase was not stereospecific, but the NCA cleaving reaction involving L-NCA hydrolase was completely L-specific. The pathway for the conversion of the by-produced D-form NCA to L-aromatic amino acids was as follows; conversion of D-form NCA to D-AAH through the reverse reaction of hydantoin hydrolase, and then conversion of the D-AAH to L-AAH through spontaneous racemization, followed by the successive hydrolysis of the L-AAH to L-aromatic amino acids by hydantoin hydrolase and L-NCA hydrolase.
- 社団法人日本農芸化学会の論文
- 1987-03-22
著者
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YOKOZEKI Kenzo
Central Research Laboratories, Ajinomoto Co., Inc.,
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Hirose Y
Faculty Of Education And Human Sciences Yamanashi University
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Yokozeki K
Ajinomoto. Co. Inc. Kawasaki Jpn
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Yokozeki Kenzo
Aminoscience Laboratories Ajinomoto. Co. Inc.
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Hirose Yuko
Department Of Chemistry Faculty Of Education Yamanashi University
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HIROSE Yoshiteru
Central Research Laboratories of Ajinomoto Co., Inc.
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KUBOTA Koji
Central Research Laboratories of Ajinomoto Co., Inc.
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Kubota K
Central Research Laboratories Of Ajinomoto Co. Inc.
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Yokozeki Kenzo
Central Research Laboratories Of Ajinomoto Co.
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Kubota Koji
Central Research Laboratories Ajinomoto Co. Inc.
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