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Peroxisomes contain a specific phytanoyl-CoA/pristanoyl-CoA thioesterase acting as a novel auxiliary enzyme in alpha- and beta-oxidation of methyl-branched fatty acids in mouse.

J Biol Chem. 2007 Sep 14;282(37):26707-26716. Epub 2007 Jul 05
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摘要


Phytanic acid and pristanic acid are derived from phytol, which enter the body via the diet. Phytanic acid contains a methyl group in position three and, therefore, cannot undergo beta-oxidation directly but instead must first undergo alpha-oxidation to pristanic acid, which then enters beta-oxidation. Both these pathways occur in peroxisomes, and in this study we have identified a novel peroxisomal acyl-CoA thioesterase named ACOT6, which we show is specifically involved in phytanic acid and pristanic acid metabolism. Sequence analysis of ACOT6 revealed a putative peroxisomal targeting signal at the C-terminal end, and cellular localization experiments verified it as a peroxisomal enzyme. Subcellular fractionation experiments showed that peroxisomes contain by far the highest phytanoyl-CoA/pristanoyl-CoA thioesterase activity in the cell, which could be almost completely immunoprecipitated using an ACOT6 antibody. Acot6 mRNA was mainly expressed in white adipose tissue and was co-expressed in tissues with Acox3 (the pristanoyl-CoA oxidase). Furthermore, Acot6 was identified as a target gene of the peroxisome proliferator-activated receptor alpha (PPARalpha) and is up-regulated in mouse liver in a PPARalpha-dependent manner.

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