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• W1837633374 abstract "Hepatic mitochondrial and peroxisomal beta-oxidation were examined in an Antarctic marine teleost, Notothenia gibberifrons. Enzymic profiles and rates of beta-oxidation by intact organelles were determined by using a range of fatty acyl-CoA substrates to evaluate substrate preferences. Partitioning of beta-oxidation between organelles was estimated. Substrate selectivities are broader for peroxisomal beta-oxidation than for mitochondrial beta-oxidation. Mitochondria show marked preference for the oxidation of a monounsaturated substrate, palmitoleoyl-CoA (C16:1), and two polyunsaturates, eicosapentaenoyl-CoA (C20:5) and docosahexaenoyl-CoA (C22:6). Carnitine palmitoyltransferase activities with palmitoleoyl-CoA (C16:1) are 2.4-fold higher than activities with palmitoyl-CoA (C16:0). Most polyunsaturated acyl-CoA esters measured appear to inhibit by over 40% the oxidation of palmitoyl-CoA by peroxisomes. Our findings suggest that the polyunsaturates, eicosapentaenoic acid (C20:5) and docosahexaenoic acid (C22:6), found in high concentrations in Antarctic fishes [Lund and Sidell (1992) Mar. Biol. 112, 377-382], are utilized as fuels to support aerobic energy metabolism. Metabolic capacities of rate-limiting enzymes and beta-oxidation rates by intact organelles indicate that up to 30% of hepatic beta-oxidation in N. gibberifrons can be initiated by the peroxisomal pathway." @default.
• W1837633374 created "2016-06-24" @default.
• W1837633374 creator A5018468690 @default.
• W1837633374 creator A5055218639 @default.
• W1837633374 date "1993-01-15" @default.
• W1837633374 modified "2023-10-04" @default.
• W1837633374 title "Substrate selectivities differ for hepatic mitochondrial and peroxisomal <i>β</i>-oxidation in an Antarctic fish, <i>Notothenia gibberifrons</i>" @default.
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• W1837633374 doi "https://doi.org/10.1042/bj2890427" @default.
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