文献类型：期刊文献

英文题名：Expressing an oxidative dehydrogenase gene in ethanologenic strain Zymomonas mobilis promotes the cellulosic ethanol fermentability

作者：Yi, Xia[1,2];Gao, Qiuqiang[1];Bao, Jie[1]

机构：[1]East China Univ Sci & Technol, State Key Lab Bioreactor Engn, 130 Meilong Rd, Shanghai 200237, Peoples R China;[2]Jiujiang Univ, Jiangxi Prov Key Lab Syst Biomed, 17 Lufeng Rd, Jiujiang 332000, Peoples R China

年份：2019

卷号：303

起止页码：1

外文期刊名：JOURNAL OF BIOTECHNOLOGY

收录：;EI(收录号：20192907190261);WOS:【SCI-EXPANDED(收录号:WOS:000480384000001)】；

基金：This research was supported by the National Natural Science Foundation of China (31961133006, 3130007).

语种：英文

外文关键词：Aldehyde dehydrogenase (ALDH); Zymomonas mobilis; Phenolic aldehydes; Oxidative pathway; Cellulosic ethanol

摘要：Phenolic aldehydes from lignocellulose pretreatment harshly inhibit the viability and metabolism of ethanol fermenting strains. Direct conversion of phenolic aldehydes is usually incomplete due to their low water solubility and recalcitrance to bioconversion. Here we consolidated phenolic aldehydes bioconversion and ethanol fermentation in a typical ethanologenic bacterium Zymomonas mobilis by constructing an intracellular oxidative pathway. The gene PP_2680 encoding NAD(+)-dependent aldehyde dehydrogenase from Pseudomonas putida KT2440 was expressed in Z. mobilis ZM4. The expression significantly improved both aldehyde inhibitor conversion and ethanol fermentability in corn stover hydrolysate. The purified PP_2680 aldehyde dehydrogenase showed strong in vitro oxidative capacity on phenolic aldehydes and its in vivo expression significantly up-regulated the key genes in the ED pathway and the oxidative phosphorylation. This study provided an important concept of simultaneous biodetoxification and fermentation in ethanologenic strains for the improvement of ethanol fermentability.