Alternate Heme Ligation Steers Activity and Selectivity in Engineered Cytochrome P450-Catalyzed Carbene-Transfer Reactions
作者:Kai Chen、Shuo-Qing Zhang、Oliver F. Brandenberg、Xin Hong、Frances H. Arnold
DOI:10.1021/jacs.8b09613
日期:2018.12.5
platform of engineered cytochrome P450 enzymes to carry out carbene-transfer reactions using a lactone-based carbene precursor. By simply altering the heme-ligating residue, we obtained two enzymes that catalyzeolefincyclopropanation (Ser) or S-H bond insertion (Cys). Both enzymes exhibit high catalytic efficiency and stereoselectivity, thus enabling facile access to structurally diverse spiro[2.4]lactones
我们报告了工程细胞色素 P450 酶的生物催化平台,以使用基于内酯的卡宾前体进行卡宾转移反应。通过简单地改变血红素连接残基,我们获得了两种催化烯烃环丙烷化 (Ser) 或 SH 键插入 (Cys) 的酶。这两种酶都表现出高催化效率和立体选择性,因此可以轻松获得结构多样化的螺[2.4]内酯和α-硫代-γ-内酯。计算研究揭示了卡宾 SH 插入的机制,并解释了轴向配体如何控制反应性和选择性。这项工作扩展了血红素蛋白的催化库,并提供了有关如何调整这些酶以适应新化学反应的见解。