Biosynthesis of Amphi-enterobactin Siderophores by <i>Vibrio harveyi</i> BAA-1116: Identification of a Bifunctional Nonribosomal Peptide Synthetase Condensation Domain
作者:Hannah K. Zane、Hiroaki Naka、Federico Rosconi、Moriah Sandy、Margo G. Haygood、Alison Butler
DOI:10.1021/ja5019942
日期:2014.4.16
(aebG). The proximity of this FACL gene to the enterobactin-like synthetase suggested that V. harveyi may produce amphiphilic enterobactin-like siderophores. Extraction of the bacterial cell pellet of V. harveyi led to the isolation and structure determination of a suite of eight amphi-enterobactin siderophores composed of the cyclic lactone of tris-2,3-dihydroxybenzoyl-L-serine and acyl-L-serine. The FACL
哈维弧菌 BAA-1116 的基因组包含类似于肠杆菌素的非核糖体肽合成酶 (NRPS) 基因簇 (aebA-F),但不产生肠杆菌素。预测编码长链脂肪酸 CoA 连接酶 (FACL) 的基因,类似于参与酰基肽生物合成的酶,距离假定的类肠杆菌素生物合成基因簇 (aebG) 15 kb。该 FACL 基因与肠杆菌素样合成酶的接近表明哈维弧菌可能产生两亲性肠杆菌素样铁载体。V. harveyi 细菌细胞沉淀的提取导致了一套八种两性肠杆菌素铁载体的分离和结构测定,这些铁载体由 tris-2,3-二羟基苯甲酰基-L-丝氨酸和酰基-L-丝氨酸的环状内酯组成。FACL 敲除突变体,ΔaebG V. harveyi,NRPS 敲除突变体 ΔaebF V. harveyi 不产生两性肠杆菌素。两性肠杆菌素生物合成机制在大肠杆菌中异源表达并在体外重组,表明 AebF 的缩合域具有独特的活性,催化两种不同的缩合反应。