The enzyme-like reaction catalyzed by flavin-reduced keratin systems.

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概要

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• The reduced keratin (RK), which was obtained by the reductive cleavage of human hair, was found to act as an apoenzyme and to furnish the reaction field for flavin adenine dinucleotide (FAD): the absorbance of the succinic acid–FAD–RK system in solution increased in the region of 200–250 nm with the lapse of time. From this system fumaric acid was isolated. FAD was found to form a complex with RK and the FAD–RK complex exhibited a catalytic activity for the dehydrogenation reaction of succinic acid to fumaric acid. FAD was reduced in this reaction and the reduced FAD was oxidized by oxygen. It was found that the process of the dehydrogenation reaction obeyed the Michaelis-Menten kinetics; the equilibrium constants of the complex formation between FAD and RK were determined by measuring the initial velocities of the dehydrogenation reaction. The binding site of FAD and RK in the complex was discussed.

• 公益社団法人 日本化学会の論文

著者

• Suzuki Shuichi

  Research Laboratory Of Resources Utilization Tokyo Institute Of Technology

• Takahashi Fujio

  Research Laboratory of Resources Utilization Tokyo Institute of Technology

• Ogasa Tatsuo

  Research Laboratory of Resources Utilization, Tokyo Institute of Technology

• Hirano Morio

  Research Laboratory of Resources Utilization, Tokyo Institute of Technology

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