Kinetic mechanism of ketoreductase activity of prostaglandin F synthase from bovine lung

FEBS Letters

Watanabe, Kikuko¹  Barski, Oleg A.¹ 

[1] Department of Enzyme and Metabolism, Osaka Bioscience Institute, 6-2-4 Furuedai, Suita, Osaka 565, Japan

关键词: Ping-pong mechanism;    Kinetics;    Prostaglandin F synthase;    Binding constant;    Aldo-keto reductase;    NADPH;    PG;    prostaglandin;   

DOI  :  10.1016/0014-5793(93)80072-3

学科分类：生物化学/生物物理

来源: John Wiley & Sons Ltd.

【 摘 要 】

The kinetic mechanism of ketoreductase activity of bovine lung prostaglandin F synthase, expressed in E. coli, was investigated. Data on initial velocity and radioisotope exchange between [³H]prostaglandin D; and 9α, 11β-prostaglandin F₂ suggest that the enzyme obeys the ping-pong mechanism. Using a fluorescence technique we obtained a binding constant of 3 μM for NADPH. This is in close correlation with the kinetically determined intrinsic Michaelis constant for NADPH. Activation energy of the redox process was determined from the temperature dependence of maximal velocities for nitrobenzaldehyde and menadione and was found to be 119 and 96 kJ/mol, respectively.

【 授权许可】

Unknown