A mechanistic study of the non-oxidative decarboxylation catalyzed by the radical S-adenosyl-<scp>l</scp>-methionine enzyme BlsE involved in blasticidin S biosynthesis
作者:Lei Liu、Xinjian Ji、Yongzhen Li、Wenjuan Ji、Tianlu Mo、Wei Ding、Qi Zhang
DOI:10.1039/c7cc04286h
日期:——
Decarboxylation is a fundamentally important reaction in biology and involves highly diverse mechanisms. Here we report a mechanistic study of the non-oxidative decarboxylation catalyzed by BlsE, a radical S-adenosyl-L-methionine (SAM) enzyme involved in blasticidin S biosynthesis. Through a series of biochemical analysis with isotopically labeled reagents, we show that the BlsE-catalyzed reaction
脱羧反应是生物学中最重要的反应,涉及高度多样的机制。在这里,我们报告由BlsE催化的非氧化脱羧的机理研究,BlsE是一种参与杀稻瘟菌素S生物合成的自由基S-腺苷-L-甲硫氨酸(SAM)酶。通过使用同位素标记的试剂进行的一系列生化分析,我们表明,BlsE催化的反应是由5'-脱氧腺苷(dAdo)自由基介导的氢从底物胞嘧啶葡萄糖醛酸(CGA)的糖碳中提取而引发的,并且确实如关于4-羟基苯基乙酸酯脱羧酶(HPAD)所提出的,其不涉及羧基。我们的研究表明,BlsE代表了一种新型的基于自由基的脱羧酶。