Penefsky 1960 J Biol Chem
From Bioblast
Penefsky HS, Pullman ME, Datta A, Racker E (1960) Partial resolution of the enzymes catalyzing oxidative phosphorylation II. Participation of a soluble adenosine triphosphatase in oxidative phosphorylation. J Biol Chem 235:3330-6. |
Penefsky HS, Pullman ME, Datta A, Racker E (1960) J Biol Chem
Abstract:
- Mechanically fragmented beef heart mitochondria have been resolved by differential centrifugation into a particulate and a soluble protein component, both of which were required for oxidative phosphorylation. The particulate fraction alone catalyzed the oxidation of succinate, Ξ²-hydroxybutyrate, isocitrate, and glutamate with little or no concomitant phosphorylation. Addition of the soluble factor to the particles resulted in a net uptake of inorganic phosphate with a P:O of 0.4 to 0.8. Similarly, both fractions were required for a P32-ATP exchange.
- The highly purified, soluble coupling factor catalyzed a dinitrophenol-stimulated hydrolysis of ATP.
- Comparative studies of the cold lability, heat stability, and other physical properties strongly favored the conclusion that the coupling and ATPase activity were catalyzed by the same protein.
- The significance of these results in relation to current concepts of the mechanism of oxidative phosphorylation has been discussed.
β’ Keywords: oxidative phosphorylation, soluble ATP
Labels:
Enzyme: Complex II;succinate dehydrogenase Regulation: ATP Coupling state: OXPHOS
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