Target-specific identification and characterization of the putative gene cluster for brasilinolide biosynthesis revealing the mechanistic insights and combinatorial synthetic utility of 2-deoxy-<scp>l</scp>-fucose biosynthetic enzymes
作者:Hsien-Tai Chiu、Chien-Pao Weng、Yu-Chin Lin、Kuan-Hung Chen
DOI:10.1039/c5ob02292d
日期:——
mechanisms of NbrCDEF enzymes were further characterized by systematic mix-and-match experiments. The enzymes were revealed to display remarkable substrate and partner promiscuity, leading to the establishment of in vitro hybrid deoxysugar biosynthetic pathways throughout an in situ one-pot (iSOP) method. This study represents the first demonstration of TDP-2dF biosynthesis at the enzyme and molecular levels
表现出强大的免疫抑制和抗真菌活性且毒性极低的油菜素内酯在结构上具有与I型聚酮化合物(PK-1)大内酯相连的异常修饰的2-脱氧-L-岩藻糖(2dF)的结构特征。从致病性生产者诺卡氏菌(Nocardia brasiliensis IFM-0406)上,通过靶标特异性简并引物鉴定出一个210 kb的基因组片段,并随后进行了测序,揭示了一个巨大的nbr基因簇,该簇具有TDP-2dF生物合成所需的基因(nbrCDEF)和那些用于PK-1的生物合成,修饰和调节。结果表明,nbr的遗传和结构域排列PK-1合成酶与巴西内酯的PK-1结构共线性一致。随后的nbrCDEF在大肠杆菌中的异源表达完成了TDP-2dF生物合成的体外重建。通过系统的混合和匹配实验进一步表征了NbrCDEF酶的催化功能和机理。揭示了这些酶显示出显着的底物和伴侣混杂性,从而导致在整个原位建立了体外杂交脱氧糖生物合成途径一锅法(iSOP)