Oxidative Phosphorylation Accompanying Oxidation of Short-chain Fatty Acids by Rat-liver Mitochondria

Overview

Journal Biochem J

Specialty Biochemistry

Date 1966 Feb 1

PMID 4223170

Citations 11

Authors

F J Hird

M J Weidemann

Affiliations

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Abstract

1. The factors concerned in the estimation of P/O ratios when fatty acids are oxidized by rat-liver mitochondria have been assessed. 2. The oxidation of butyrate, hexanoate and octanoate is accompanied by ATP synthesis. At low concentrations of the fatty acids, P/O ratios approximately 2.5 are obtained. 3. Oxidative phosphorylation is uncoupled, respiratory control ratios are lowered and respiration is inhibited when the concentration of the fatty acid in the incubating medium is raised (to 5-10mm); octanoate is a more potent uncoupler than either hexanoate or butyrate. 4. Serum albumin and carnitine, either singly or in combination, protect the mitochondria from the effect exerted by the fatty acids. 5. The rate of oxidation of short-chain fatty acids in the presence of ADP is increased in the presence of carnitine.

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