β-Lactone formation during product release from a nonribosomal peptide synthetase
作者:Jason E Schaffer、Margaret R Reck、Neha K Prasad、Timothy A Wencewicz
DOI:10.1038/nchembio.2374
日期:2017.7
respectively. Here we report the enzyme-catalyzed formation of a highly strained β-lactone ring during TE-mediated cyclization of a β-hydroxythioester to release the antibiotic obafluorin (Obi) from an NRPS assembly line. The Obi NRPS (ObiF) contains a type I TE domain with a rare catalytic cysteine residue that plays a direct role in β-lactone ring formation. We present a detailed genetic and biochemical
非核糖体肽合成酶(NRPS)是多域模块化生物合成装配线,可将氨基酸聚合成无数的具有生物活性的非核糖体肽(NRP)。NRPS硫酯酶(TE)域采用多种释放策略,通常通过水解,氨解或环化作用从末端模块上卸下硫酯束缚的聚合肽,以分别提供成熟的抗生素,分别为羧酸/酯,酰胺和内酰胺/内酯。在这里,我们报告了在TE介导的β-羟基硫酯的环化过程中,从NRPS组装生产线释放抗生素的obafluorin(Obi)的过程中,酶催化的高张力β-内酯环的形成。Obi NRPS(ObiF)包含一个I型TE结构域,该结构域具有一个罕见的催化半胱氨酸残基,该残基在β-内酯环的形成中起着直接作用。荧光假单胞菌ATCC 39502建立了β-内酯生物发生的一般策略。