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Co-fermentation of glycerol and glucose by a co-culture system of engineered Escherichia coli strains for 1,3-propanediol production without vitamin B supplementation

Bioresour Technol. 2020; 
Junhua Yun, Hossain M Zabed, Yufei Zhang, Amreesh Parvez, Guoyan Zhang, Xianghui Qi
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Gene Synthesis … Gene sequences of dhaB1 and dhaB2 were analyzed online using the SMS software (https://www.genscript.com/sms2/index.html). Q5 polymerase (NEB, England), and a high-fidelity DNA polymerase were used in PCR amplification. 2.4 … Get A Quote

摘要

The necessity of costly co-enzyme B for the activity of glycerol dehydratase (GDHt) is considered as a major bottleneck in sustainable bioproduction of 1,3-propanediol (1,3-PD) from glycerol. Here, an E. coil Rosetta-dhaB1-dhaB2 strain was constructed by overexpressing a B-independent GDHt (dhaB1) and its activating factor (dhaB2) from Clostridium butyricum. Subsequently, it was used in designing a co-culture with E. coli BL21-dhaT that overexpressed 1,3-PD oxidoreductase (dhaT), to produce 1,3-PD during co-fermentation of glycerol and glucose. The optimum initial ratio of BL21-dhaT to Rosetta-dhaB1-dhaB2 strains in the co-culture was 1.5. Compared to the fermentation of glycerol alone, co-fermentation approach... More

关键词

1,3-Propanediol, Co-culture, Glycerol dehydratase, Glycerol valorization, Microbial biosynthesis
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