Pig heart mitochondrial ATPase : properties of purified and membrane-bound enzyme


Di Pietro, Attilio; Godinot, Catherine; Bouillant, Marie-Louise; Gautheron, Danièle C.

Publication Year 1975
Journal Biochimie
Pages 959-967
Volume 57
Issue 8
Issn 3009084
DOI 10.1016/S0300-9084(75)80218-5
URL https://linkinghub.elsevier.com/retrieve/pii/S0300908475802185

Soluble ATPase (F1)has been purified from pig heart mitochondria. The purified enzyme had a high specific activity and was homogeneous as checked by ultracentrifugation and electrofocusing. It could be dissociated into subunits by cold-treatment or sodium dodecyl sulfate denaturation. The molecular weights of the two major and three minor subunits could be estimated by sodium dodecyl sulfate gel electrophoresis. The native enzyme had an isoelectric point of 5.2 while the cold-denatured enzyme showed three main bands focusing at pH 5.0, 5.2 and 5.4. Kinetic properties (Vm and Km (ATP)) have been compared for the soluble and membrane bound ATPase in presence of various anions. Inhibitory effects of Quercetin and other flavonoids have been tested in order to get an insight on the interaction between ATPase and its natural inhibitor.