Temperature Dependence of Mitochondrial Oligomycin-sensitive Proton Transport ATPase

Overview

Journal J Bioenerg Biomembr

Publisher Springer

Specialties Biochemistry
Biology
Endocrinology

Date 1984 Dec 1

PMID 6242243

Citations 3

Authors

G Solaini

A Baracca

G Parenti Castelli

G Lenaz

Affiliations

Soon will be listed here.

Abstract

The temperature dependence of the oligomycin-sensitive ATPase (complex V) kinetic parameters has been investigated in enzyme preparations of different phospholipid composition. In submitochondrial particles, isolated complex V, and complex V reconstituted in dimyristoyl lecithin vesicles, the Arrhenius plots show discontinuities in the range 18-28 degrees C, while no discontinuity is detected with dioleoyl lecithin recombinant. Van't Hoff plots of Km also show breaks in the same temperature interval, with the exception of the dioleoyl-enzyme vesicles, where Km is unchanged. Thermodynamic analysis of the ATPase reaction shows that DMPC-complex V has rather larger values of activation enthalpy and activation entropy below the transition temperature (24 degrees C) than those of the other preparations, while all enzyme preparations show similar free energies of activation (14.3-18.5 kcal/mol). The results indicate that temperature and lipid composition influence to a different extent both kinetic and thermodynamic parameters of ATP hydrolysis catalyzed by the mitochondrial ATPase.

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