Enzymatic Polyketide Chain Branching To Give Substituted Lactone, Lactam, and Glutarimide Heterocycles
作者:Daniel Heine、Tom Bretschneider、Srividhya Sundaram、Christian Hertweck
DOI:10.1002/anie.201407282
日期:2014.10.20
was monitored in vitro. The impact of the type and configuration of the δ‐substituents was probed and it was found that amino‐substituted surrogates yield the corresponding lactams. A carboxamide analogue was transformed into a glutarimide unit, which can be found in many natural products. Our findings illuminate the biosynthesis of glutarimide‐bearing polyketides and also demonstrate the utility of this
聚酮化合物通常是由酰基硫酯的头尾缩合产生高度官能化的线性链产生的。然而,植物毒素根霉菌素的生物合成涉及一种聚酮化合物合酶(PKS)模块,该模块通过将丙二酸增量剂迈克尔加成至α,β-不饱和中间单元而引入δ-内酯链分支。为了评估分支模块的范围内,聚酮化合物模拟物的合成和通过重构PKS其生物转化从模块根霉共生体伯克霍尔德rhizoxinica在体外进行监测。探究了δ取代基的类型和构型的影响,发现氨基取代的替代物产生相应的内酰胺。羧酰胺类似物被转化为戊二酰亚胺单元,可以在许多天然产物中找到。我们的发现阐明了带有戊二酰亚胺的聚酮化合物的生物合成,也证明了该分支模块在合成生物学中的实用性。