An <i>in vitro</i> cascade with four enzymes for the production of <scp>d</scp>-3,4-dihydroxybutyric acid from <scp>d</scp>-xylose
作者:Yipeng Zhang、Liting Ma、Weikang Sun、Dan Xiao、Chuanjuan Lü、Qian Wang、Ping Xu、Cuiqing Ma、Chao Gao
DOI:10.1039/d2gc02177c
日期:——
enzymatic cascade composed of ScAldO, dihydroxy acid dehydratase from Paralcaligenes ureilyticus, α-ketoacid decarboxylase from Lactococcus lactis and catalase from Aspergillus niger was constructed for the production of D-3,4-DHBA from D-xylose. Under the optimal conditions, D-3,4-DHBA at a concentration of 4.55 g L−1 was produced from D-xylose with a molar yield of 83% and a productivity of 0.217 g L−1
D -3,4-二羟基丁酸 ( D -3,4-DHBA) 是一种重要的平台化学品,在化学和制药行业具有多种应用。报道的从D -木糖产生D -3,4 -DHBA的代谢途径涉及两个 NAD 依赖性脱氢酶催化反应,因此是氧化还原不平衡的。在这项研究中,来自天蓝色链霉菌A3 (ScAldO) 的突变型糖醇氧化酶被鉴定为催化D -木糖和D -3,4-二羟基丁醛的氧化,这是D -3,4所需的两种 NAD 依赖性脱氢酶催化反应-DHBA生产。然后,体外构建了由ScAldO、来自Paralcaligenes ureilyticus的二羟基酸脱水酶、来自乳酸乳球菌的α-酮酸脱羧酶和来自黑曲霉的过氧化氢酶组成的酶级联,用于从D-木糖生产D -3,4 - DHBA。在最佳条件下,由D-木糖生产出浓度为4.55 g L -1的D -3,4- DHBA,摩尔收率为83%,产率为0.217 g L -1 h -1。体外