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- W2093724043 abstract "The nature of the oxygenated intermediate observed (Fujisawa, H., Hiromi, K., Uyeda, M., Okuno, S., Nozaki, M. and Hayaishi, O. (1972) J. Biol. Chem. 247, 4422–4428) during the reaction of protocatechuate 3,4-dioxygenase (protocatechuate:oxygen 3,4-oxidoreductase (decyclizing), EC 1.13.11.3) was investigated. 3,4-Dihydroxyphenylpropionic acid and 3,4-dihydroxyphenylacetic acid were used as substrates of the enzyme to slow down the rate of the reaction. The enzyme reactions were performed under conditions where the concentration of the organic substrate was lower than those of the enzyme and oxygen in the reaction mixture. The reactions were stopped before completion by the addition of hydrochloric acid or guanidine hydrochloride and then the organic compounds were extracted from the reaction mixture to be analyzed. The qualitative analyses by thin-layer chromatography revealed that there was no species other than the organic substrate and the enzymatic reaction end-product during reaction. The quantitative spectrophotometric analyses revealed that the organic substrate which had participated in the formation of the oxygenated intermediate existed as a species indistinguishable from the reaction end-product, indicating that the oxygenated intermediate was not a simple complex of oxygen, substrate and the enzyme, i.e., a ternary complex, but a species rather close to a binary complex of product and the enzyme." @default.
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- W2093724043 date "1978-11-01" @default.
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- W2093724043 title "Studies on the reaction intermediate of protocatechuate 3,4-dioxygenase Formation of enzyme-product complex" @default.
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- W2093724043 doi "https://doi.org/10.1016/0005-2744(78)90266-8" @default.
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