Study of Class I and Class III Polyhydroxyalkanoate (PHA) Synthases with Substrates Containing a Modified Side Chain
作者:Kaimin Jia、Ruikai Cao、Duy H. Hua、Ping Li
DOI:10.1021/acs.biomac.6b00082
日期:2016.4.11
class III synthase from Allochromatium vinosum (PhaECAv). It was found that, while different PHA synthases displayed distinct preference with regard to the length of the alkyl side chains, they could withstand moderate side chain modifications such as terminal unsaturated bonds and the azide group. Specifically, the specific activity of PhaCCs toward propynyl analogue (HHxyCoA) was only 5-fold less than
聚羟基链烷酸酯(PHA)是碳和能量存储聚合物,由多种微生物在营养受限的条件下产生。由于它们的可再生性,多功能性和可生物降解性,它们被认为是石油基塑料的环保替代品。PHA合酶(PhaC)在PHA生物合成中起着核心作用,其中PHA合酶的活性和底物特异性是决定所生产聚合物的生产率和特性的主要因素。然而,由于难以获得所需的类似物,所以修饰底物侧链的效果还没有被很好地理解。在此报告中,合成了一系列3-(R)-羟酰基辅酶A(HACoA)类似物,并用Chromobacterium sp。的I类合酶进行了测试。USM2(PhaC Cs和A479S-PhaC Cs)和Caulobacter crescentus(PhaC Cc)以及来自异色变色菌(PhaEC Av)的III类合酶。已经发现,尽管不同的PHA合酶在烷基侧链的长度方面表现出不同的偏好,但是它们可以承受中等的侧链修饰,例如末端不饱和键和叠氮基。具体而言,PhaC