H
Hitoshi Fujisawa
Researcher at Kyoto University
Publications - 11
Citations - 484
Hitoshi Fujisawa is an academic researcher from Kyoto University. The author has contributed to research in topics: Reaction intermediate & Substrate (chemistry). The author has an hindex of 8, co-authored 11 publications receiving 483 citations. Previous affiliations of Hitoshi Fujisawa include Osaka University.
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Protocatechuate 3,4-Dioxygenase I. CRYSTALLIZATION AND CHARACTERIZATION
Hitoshi Fujisawa,Osamu Hayaishi +1 more
TL;DR: Crystalline enzyme obtained by purification and crystallization of protocatechuate 3,4-dioxygenase from p-hydroxybenzoate-induced cells of Pseudomonas aeruginosa showed the same enzymic activity and physicochemical properties as described.
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Protocatechuate 3,4-Dioxygenase II. ELECTRON SPIN RESONANCE AND SPECTRAL STUDIES ON INTERACTION OF SUBSTRATES AND ENZYME
TL;DR: The results indicate that the trivalent iron bound to the enzyme is responsible for the electron spin resonance signal as well as the visible absorption spectrum of the enzyme, indicating the possible formation of a enzyme-substrate complex.
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Protocatechuate 3,4-Dioxygenase III. AN OXYGENATED FORM OF ENZYME AS REACTION INTERMEDIATE
TL;DR: Results indicate that the new spectral species is a ternary complex of oxygen, substrate, and enzyme, and its degradation is the rate-limiting step of the over-all reaction.
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Studies on the Mechanism of Action Pyrocatechase by Electron Spin Resonance Spectroscopy
Teruko Nakazawa,Teruko Nakazawa,Yutaka Kojima,Yutaka Kojima,Hitoshi Fujisawa,Hitoshi Fujisawa,Mitsuhiro Nozaki,Mitsuhiro Nozaki,Osamu Hayaishi,Osamu Hayaishi,T. Yamano,T. Yamano +11 more
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Oxygenated form of protocatechuate 3,4-dioxygenase, a non-heme iron-containing dioxygenase, as reaction intermediate.
TL;DR: A short-lived new spectral species of protocatechuate 3,4-dioxygenase, a trivalent non-heme iron-containing enzyme, was observed in the early stage of the reaction, interpreted to represent an oxygenated form of the enzyme, namely a ternary complex of oxygen, substrate, and enzyme, and to be an obligatory intermediate in the reaction.