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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 B12 supplementation.

Abstract：

:The necessity of costly co-enzyme B12 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 B12-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 provided 1.3-folds higher 1,3-PD. Finally, co-fermentation was done in a 10 L bioreactor that produced 41.65 g/L 1,3-PD, which corresponded to 0.69 g/L/h productivity and 0.67 mol/mol yield of 1,3-PD. Hence, the developed co-culture could produce 1,3-PD cost-effectively without requiring vitamin B12.

journal_name

Bioresour Technol

journal_title

Bioresource technology

authors

Yun J,Zabed HM,Zhang Y,Parvez A,Zhang G,Qi X

doi

10.1016/j.biortech.2020.124218

subject

Has Abstract

pub_date

2021-01-01 00:00:00

pages

124218

eissn

0960-8524

issn

1873-2976

pii

S0960-8524(20)31492-9

journal_volume

319

pub_type

杂志文章

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