Kinetics of Thermal Inactivation of Lactate Dehydrogenase from Rabbit Muscle

Journal of Protein Chemistry - Tập 16 Số 8 - Trang 801-807 - 1997
Bai, Ji-Hong1, Wang, Hao-Jing2, Liu, De-Shan2, Zhou, Hai-Meng1,3
1Department of Biological Science and Biotechnology, Tsinghua University, Beijing, China
2Department of Chemical Engineering, Tsinghua University, Beijing, China
3State Key Laboratory of Biomembrane and Membrane Biotechnology, Beijing, China

Tóm tắt

The kinetics of thermal inactivation of rabbit muscle lactate dehydrogenase at different temperatures has been studied using the kinetic method for the substrate reaction during irreversible inhibition of enzyme activity previously described by Tsou [Adv. Enzymol. Relat. Areas Mol. Biol. (1988), 61, 381–436]. The results show that thermal inactivation of the enzyme is an irreversible reaction. Microscopic rate constants were determined for thermal inactivation of the free enzyme and the enzyme–substrate complex. The inactivation rate constant of the free enzyme is much larger than the rate constant of the enzyme–substrate complex. The results suggest that the presence of the substrate has a certain protective effect against thermal inactivation of the enzyme.

Tài liệu tham khảo

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