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Kinetics of inhibition of polyphenol oxidase obtained from tobacco nicotiana tobacum

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4 Author(s)
Liu, Weiqun ; College of Agronomy, Henan Agricultural University, Zhengzhou 450002, China ; Rao, Xueming ; Pan, Jicheng ; Zhou, Haimeng

In this study, the kinetics of inhibition of polyphenol oxidase by L-cysteine has been investigated. The inhibition of tobacco polyphenol oxidase was studied using the progress-of-substrate-reaction method proposed by Tsou, following the substrate reaction during irreversible inhibition of the enzyme activity. Analysis of the inhibition kinetics shows that inhibition occurs by an irreversible and non-complexation reaction. The microscopic rate constants were determined for reaction of the inhibitor both with the free enzyme and with the enzyme-substrate complex. The results show that the presence of the substrate has a significant protective effect of the enzyme against inactivation by L-cysteine.

Published in:

Tsinghua Science and Technology  (Volume:9 ,  Issue: 1 )

Date of Publication:

Feb. 2004

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