Fatty acid circuit as a physiological mechanism of uncoupling of oxidative phosphorylation.
Free fatty acids, natural uncouplers of oxidative phosphorylation, are shown to differ from artificial ones in that they fail to increase conductance of phospholipid bilayers which are permeable for the protonated form of fatty acids but impermeable for their anionic form. Recent studies have revealed that uncoupling by fatty acids in mitochondria is mediated by the ATP/ADP antiporter and, in brown fat, by thermogenin which is structurally very similar to the antiporter. It is suggested that both the ATP/ADP antiporter and thermogenin facilitate translocation of the fatty anions through the mitochondrial membrane.
Skulachev
V P
VP
Department of Bioenergetics, A.N. Belozersky Institute of Physico-Chemical Biology, Moscow State University, USSR.
D002001:Adipose Tissue, Brown / Q000378:metabolism; D000818:Animals; D002352:Carrier Proteins / Q000378:metabolism; D005227:Fatty Acids / Q000378:metabolism*; D007425:Intracellular Membranes / Q000378:metabolism; D007473:Ion Channels; D008565:Membrane Proteins / Q000378:metabolism; D008928:Mitochondria / Q000378:metabolism; D000226:Mitochondrial ADP, ATP Translocases / Q000378:metabolism; D024101:Mitochondrial Proteins; D008954:Models, Biological; D010085:Oxidative Phosphorylation; D014475:Uncoupling Agents / Q000378:metabolism*; D000071256:Uncoupling Protein 1
D002352:Carrier Proteins; D005227:Fatty Acids; D007473:Ion Channels; D008565:Membrane Proteins; D024101:Mitochondrial Proteins; D014475:Uncoupling Agents; D000071256:Uncoupling Protein 1; D000226:Mitochondrial ADP, ATP Translocases