Insights into the Functionalization of the Methylsalicyclic Moiety during the Biosynthesis of Chlorothricin by Comparative Kinetic Assays of the Activities of Two KAS III‐like Acyltransferases
作者:Xuan Yi、Qunfei Zhao、Zhenhua Tian、Xinying Jia、Weiguo Cao、Wen Liu、Qing‐Li He
DOI:10.1002/cjoc.201900134
日期:2019.8
β‐Ketoacyl‐ACP synthase III (KAS III)‐like acyltransferases, ChlB3 and ChlB6, which function together to coordinate the transfer of MSA through ChlB2, a discrete acyl carrier protein (ACP). During the maturation of CHL, MSA needs to be further functionalized by C2‐O‐methylation and C5‐chlorination; however, timing of this functionalization process remains poorly understood. In this study, we report comparative
螺旋菌素抗生素家族的原型成员氯霉素(CHL)具有含四环素的五环糖苷配基,该化合物通过二糖键与修饰的甲基水杨酸(MSA)部分缀合。MSA是由迭代I型聚酮化合物合酶ChlB1组装而成的聚酮化合物产品。将此重要的药学部分并入CHL依赖于两种不同的β-酮酰基-ACP合酶III(KAS III)样酰基转移酶ChlB3和ChlB6的活性,二者协同作用以协调MSA通过离散的酰基载体ChlB2的转移。蛋白质(ACP)。在成熟CHL,MSA需要通过C2 - O-甲基化和C5-氯化进一步功能化; 但是,此功能化过程的时间安排仍然知之甚少。在这项研究中,我们报道了使用取代程度和ACP载体不同的底物对两种KAS III样酰基转移酶ChlB3和ChlB6的活性进行的动力学比较动力学分析。ChlB3倾向于将立即组装的6-甲基-MSA部分从ChlB1-ACP转移到离散的ACP ChlB2,从该部分开始,优选在C2- O