Improving the Monooxygenase Activity and the Regio- and Stereoselectivity of Terpenoid Hydroxylation Using Ester Directing Groups
作者:Emma A. Hall、Md. Raihan Sarkar、Joel H. Z. Lee、Samuel D. Munday、Stephen G. Bell
DOI:10.1021/acscatal.6b01882
日期:2016.9.2
enzyme CYP101B1, from Novosphingobium aromaticivorans DSM12444, binds norisoprenoids more tightly than monoterpenoids and oxidized these substrates with high regioselectivity. Ionols bound less tightly to CYP101B1 than ionones, but the levels of product formation remained high and the selectivity of oxidation was similar to that observed for the parent norisoprenoid. The structurally related sesquiterpene
来自芳族新孢子虫DSM12444的单加氧酶CYP101B1比单萜类更牢固地结合去甲肾上腺素,并以高区域选择性氧化这些底物。与紫罗兰酮相比,紫罗兰醇与CYP101B1的结合较不紧密,但产物形成的水平仍然很高,并且氧化的选择性与对母体类类异戊二烯的观察到的相似。通过CYP101B1将结构上相关的倍半萜烯内酯(+)-香紫苏内酯(9)立体选择性地羟基化为(S)-(+)-3-羟基香紫苏内酯(9a)。尽管有希望的结合数据,单萜类衍生物的营业额显示出低水平的产物形成和选择性。CYP101B1催化(1 R)-(-)-nopol(14)和顺式-茉莉酮(15),分别产生> 90%(1 R)-(-)-5-hydroxynopol(14a)和4-羟基-顺式-茉莉酮(15a) 。为开发使用CYP101B1高效,选择性地氧化单萜类底物的策略,我们研究了萜类乙酸酯的结合和催化性能。这些底物的酯官能团模拟了类异戊二烯类化