Biochemical and Structural Insights into the Aminotransferase CrmG in Caerulomycin Biosynthesis
作者:Yiguang Zhu、Jinxin Xu、Xiangui Mei、Zhan Feng、Liping Zhang、Qingbo Zhang、Guangtao Zhang、Weiming Zhu、Jinsong Liu、Changsheng Zhang
DOI:10.1021/acschembio.5b00984
日期:2016.4.15
functional characterization, kinetic analysis, substrate specificity, and structure insights of an aminotransferase CrmG in 1 biosynthesis. The aminotransferase CrmG was confirmed to catalyze a key transamination reaction to convert an aldehyde group to an amino group in the 1 biosynthetic pathway, preferring l-glutamate and l-glutamine as the amino donor substrates. The crystal structures of CrmG in
Caerulomycin A(CRM A 1)属于含有2,2'-联吡啶基环核心结构的天然产物家族,目前正在开发作为有效的新型免疫抑制剂。在这里,我们报告氨基转移酶CrmG在1生物合成中的功能表征,动力学分析,底物特异性和结构见解。转氨酶CrmG确认以催化关键氨基转移反应成醛基转化成氨基中的1种生物合成途径,宁愿升谷氨酸盐和升-谷氨酰胺作为氨基供体底物。CrmG的晶体结构与5'-磷酸吡ox醛磷酸盐(PLP)或5'-磷酸吡ox胺磷酸盐(PMP)或受体底物复合形成的晶体结构经确定采用PLP依赖型酶的典型折叠I型,且具有独特的小附加域。结构指导的定点诱变确定了底物结合和催化活性的关键氨基酸残基,从而为CrmG的转氨机制提供了见识。