文献类型：期刊文献

英文题名：Identification of the enzymes responsible for 3-hydroxypropionic acid formation and their use in improving 3-hydroxypropionic acid production in Gluconobacter oxydans DSM 2003

作者：Zhu, Jiawei[1];Xie, Jingli[1];Wei, Liujing[1];Lin, Jinping[1];Zhao, Li[1];Wei, Dongzhi[1]

机构：[1]East China Univ Sci & Technol, New World Inst Biotechnol, State Key Lab Bioreactor Engn, Shanghai 200237, Peoples R China

年份：2018

卷号：265

起止页码：328

外文期刊名：BIORESOURCE TECHNOLOGY

收录：;EI(收录号：20182805531609);WOS:【SCI-EXPANDED(收录号:WOS:000439467300039)】；

基金：This work was financially supported by the Natural Science Foundation of China (No. 21506057).

语种：英文

外文关键词：3-Hydroxypropionic acid; Gluconobacter oxydans; Membrane-bound alcohol dehydrogenase; Membrane-bound aldehyde dehydrogenase; Metabolic pathway

摘要：Gluconobacter oxydans can be efficiently used to produce 3-hydroxypropionic acid (3-HP) from 1,3-propanediol (1,3-PDO). However, the enzymes involved remain unclear. In this study, transcription analysis of two mutants of strain DSM 2003, obtained by UV-mutagenesis, revealed that membrane-bound alcohol dehydrogenase (mADH) and membrane-bound aldehyde dehydrogenase (mALDH) might be the main enzymes involved. Through deletion and complementation of the genes adhA and aldh, mADH and mALDH were verified as the main enzymes responsible for 3-HP production. Then mALDH was verified as the rate-limiting enzyme in 3-HP production. Since that overexpression of mADH had no effect on 3-HP production, whereas overexpression of mALDH increased 23.6% 3-HP production. Finally, the 3-HP titer of 45.8 g/L and the highest productivity 1.86 g/L/h were achieved when the two mutants DSM 2003/adhAB and DSM 2003/aldh were mixed at a ratio of 1:2 (cell density) and used as whole cell catalysts for 3-HP production.