Biotransformation of ethylene glycol by engineered Escherichia coli  

作　　者：Wenlong Yan Xinhua Qi Zhibei Cao Mingdong Yao Mingzhu Ding Yingjin Yuan 

机构地区：[1]Frontiers Science Center for Synthetic Biology and Key Laboratory of Systems Bioengineering(Ministry of Education),School of Chemical Engineering and Technology,Tianjin University,Tianjin,300072,China [2]Frontiers Research Institute for Synthetic Biology,Tianjin University,Tianjin,300072,China

出　　处：《Synthetic and Systems Biotechnology》2024年第3期531-539,共9页合成和系统生物技术（英文）

基　　金：supported by the National Key Research and Development Program of China(2019YFA0706900);National Natural Science Foundation of China(22278310).

摘　　要：There has been extensive research on the biological recycling of PET waste to address the issue of plastic waste pollution,with ethylene glycol(EG)being one of the main components recovered from this process.Therefore,finding ways to convert PET monomer EG into high-value products is crucial for effective PET waste recycling.In this study,we successfully engineered Escherichia coli to utilize EG and produce glycolic acid(GA),expecting to facilitate the biological recycling of PET waste.The engineered E.coli,able to utilize 10 g/L EG to produce 1.38 g/L GA within 96 h,was initially constructed.Subsequently,strategies based on overexpression of key enzymes and knock-out of the competing pathways are employed to enhance EG utilization along with GA biosynthesis.An engineered E.coli,characterized by the highest GA production titer and substrate conversion rate,was obtained.The GA titer increased to 5.1 g/L with a yield of 0.75 g/g EG,which is the highest level in the shake flake experiments.Transcriptional level analysis and metabolomic analysis were then conducted,revealing that overexpression of key enzymes and knock-out of the competing pathways improved the metabolic flow in the EG utilization.The improved metabolic flow also leads to accelerated synthesis and metabolism of amino acids.

关 键 词：PET biological recycling Ethylene glycol utilization Glycolic acid production Escherichia coli Synthetic biology Metabolomics analysis 

分 类 号：O62[理学—有机化学]