Transformations of cyclic nonaketides by Aspergillus terreus mutants blocked for lovastatin biosynthesis at the lovA and lovC genes
作者:John L. Sorensen、Karine Auclair、Jonathan Kennedy、C. Richard Hutchinson、John C. Vederas
DOI:10.1039/b207721c
日期:2003.12.19
Two mutants of Aspergillus terreus with either the lovC or lovA genes disrupted were examined for their ability to transform nonaketides into lovastatin 1, a cholesterol-lowering drug. The lovC disruptant was able to efficiently convert dihydromonacolinL 5 or monacolin J 9 into 1, and could also transform desmethylmonacolin J 15 into compactin 3. In contrast, the lovA mutant has an unexpectedly active
Double Oxidation of the Cyclic Nonaketide Dihydromonacolin L to Monacolin J by a Single Cytochrome P450 Monooxygenase, LovA
作者:Jorge Barriuso、Don T. Nguyen、Jesse W.-H Li、Joseph N. Roberts、Gillian MacNevin、Jennifer L. Chaytor、Sandra L. Marcus、John C. Vederas、Dae-Kyun Ro
DOI:10.1021/ja201138v
日期:2011.6.1
of dihydromonacolinL acid to monacolin L acid and monacolin J acid, two proposed pathway intermediates in the biosynthesis of lovastatin. LovA was demonstrated to catalyze the regio- and stereo-specific hydroxylation of monacolin L acid to yield monacolin J acid. These results demonstrate that LovA is the single enzyme that performs both of the two elusive oxidative reactions in the lovastatin biosynthesis
洛伐他汀是一种来自土曲霉的环状九肽,是一种高胆固醇血症药物和辛伐他汀的前体,辛伐他汀是一种半合成的降胆固醇药物。洛伐他汀主链 (dihydromonacolin L) 的生物合成和最终的 2-甲基丁酰修饰已得到充分表征。然而,尚不清楚如何催化两个中心反应,即 4a,5-双键的引入和 C-8 的羟基化。细胞色素 P450 基因 lovA 与聚酮合酶 lovB 聚集在一起,是这些反应的主要候选者,但无法获得 LovA 重组酶阻碍了详细的生化分析。lovA 的合成密码子优化和/或 N 端肽替换允许 lovA 在酵母(酿酒酵母)中表达。体内喂养和体外酶分析均表明,LovA 催化二氢莫纳可林 L 酸转化为莫纳可林 L 酸和莫纳可林 J 酸,这是洛伐他汀生物合成中的两种拟议途径中间体。LovA 被证明可催化 monacolin L 酸的区域和立体特异性羟基化,以产生 monacolin J 酸。这些结果表明,LovA