Molecular Cloning and Expression of Human Carnitine Octanoyltransferase: Evidence for Its Role in the Peroxisomal β-Oxidation of Branched-Chain Fatty Acids
作者:Sacha Ferdinandusse、Joyce Mulders、Lodewijk IJlst、Simone Denis、Georges Dacremont、Hans R. Waterham、Ronald J.A. Wanders
DOI:10.1006/bbrc.1999.1340
日期:1999.9
putative role of human carnitine octanoyltransferase (COT) in the beta-oxidation of branched-chain fatty acids, we identified and cloned the cDNA encoding human COT and expressed it in the yeast Saccharomyces cerevisiae. Enzyme activity measurements showed that COT efficiently converts one of the end products of the peroxisomal beta-oxidation of pristanic acid, 4, 8-dimethylnonanoyl-CoA, to its corresponding
为了研究人肉碱辛酰基转移酶(COT)在支链脂肪酸的β-氧化中的假定作用,我们鉴定并克隆了编码人COT的cDNA,并在酿酒酵母中表达了它。酶活性测量表明,COT有效地将过氧体过氧化物酶体β-氧化的链烷酸4、8-二甲基壬酰基-CoA转化为其相应的肉碱酯。过氧化物酶体中该支链/中链酰基辅酶A的肉碱酯的生产需要其运输到线粒体,然后发生进一步的β-氧化。相反,4,8-二甲基壬酰基-CoA不是肉碱乙酰基转移酶的底物,肉碱乙酰基转移酶是位于过氧化物酶体中的另一种酰基转移酶,它催化了链烷酸β-氧化的其他产物肉碱酯的形成,即乙酰辅酶A和丙酰辅酶A。我们的研究结果揭示了COT在脂肪酸代谢中的功能,并指出了COT在支链脂肪酸的β-氧化中的关键作用。