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Engineering a glycerol utilization pathway in Corynebacterium glutamicum for succinate production under O2
Chen Wang1, Heng Cai2, Zhongjun Chen3
1College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, Nanjing, People's Republic of China.
Objective:
To explore the glycerol utilization pathway in Corynebacterium glutamicum for succinate production under O2 deprivation.
Result:
Overexpression of a glycerol facilitator, glycerol dehydrogenase and dihydroxyacetone kinase from Escherichia coli K-12 in C. glutamicum led to recombinant strains NC-3G diverting glycerol utilization towards succinate production under O2 deprivation. Under these conditions, strain NC-3G efficiently consumed glycerol and produced succinate without growth. The recombinant C. glutamicum utilizing glycerol as the sole carbon source showed higher intracellular NADH/NAD(+) ratio compare with utilizing glucose. The mass conversion of succinate increased from 0.64 to 0.95. Using an anaerobic fed-batch fermentation process, the final strain produced 38.4 g succinate/l with an average yield of 1.02 g/g.
Conclusions:
The metabolically-engineered strains showed an efficient succinate production using glycerol as sole carbon source under O2 deprivation.
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