Oxygenation of Monoenoic Fatty Acids by CYP175A1, an Orphan Cytochrome P450 from <i>Thermus thermophilus</i> HB27
作者:Sandeep Goyal、Shibdas Banerjee、Shyamalava Mazumdar
DOI:10.1021/bi300514j
日期:2012.10.9
monooxygenation of the monoenoic fatty acids depending on the ethylenic double bond (C═C) configuration. When the double bond was in cis-configuration, an epoxy fatty acid was found to be the major product and two allyl-hydroxy fatty acids were found to be the minor products. But when the double bond was in trans-configuration the product distribution was reversed. The oxygenation efficiency was found to be
已经研究了CYP175A1对各种链长(C16–C24)的饱和和单不饱和脂肪酸的单加氧反应的催化活性,以评估该孤儿热稳定细胞色素P450酶的酶促性质。结果表明,该酶可以催化单不饱和脂肪酸的反应,但不能催化饱和脂肪酸的反应。使用ESI-MS和GC-MS进行的产品分析表明,取决于烯键式双键(C═C)的构型,CYP175A1催化单烯脂肪酸的单加氧反应具有重要的区域选择性。当双键处于顺式构型时,发现环氧脂肪酸是主要产物,而发现两个烯丙基-羟基脂肪酸是次要产物。但是当双键处于反式构型时,产物分布相反。发现棕榈油酸的氧化效率最高(链长为C16),但活性与链长或脂肪酸的不饱和位置没有直接关系。分子对接计算表明,单烯脂肪酸的“ U”型构型特别负责它们在酶口袋中的结合,这也与在氧化反应中观察到的区域选择性一致。目前的结果提供证据,CYP175A1可以催化几种单烯脂肪酸的区域选择性氧化反应,尽管它不能催化相应的