Metabolic engineering of Clostridium tyrobutyricum for enhanced butyric acid production from undetoxified corncob acid hydrolysate

•Furfural severely inhibited the butyrate productivity of C. tyrobutyricum.•Heterologous expression of sdr increased furfural tolerance of C. tyrobutyricum.•Coexpression of sdr and groESL enhanced the utilization of corncob acid hydrolysate.•32.8 g/L butyrate at a productivity of 0.29 g/L·h and yiel...

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Bibliographic Details
Published in:Bioresource technology 2019-01, Vol.271, p.266-273
Main Authors: Suo, Yukai, Liao, Zhengping, Qu, Chunyun, Fu, Hongxin, Wang, Jufang
Format: Article
Language:English
Subjects:
Bioreactors
Butyric acid
Butyric Acid - metabolism
Clostridium tyrobutyricum
Clostridium tyrobutyricum - metabolism
Corncob acid hydrolysate
Fermentation
GroESL
Hydrolysis
Metabolic Engineering
Short-chain dehydrogenase/reductase
Zea mays - metabolism
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Summary:•Furfural severely inhibited the butyrate productivity of C. tyrobutyricum.•Heterologous expression of sdr increased furfural tolerance of C. tyrobutyricum.•Coexpression of sdr and groESL enhanced the utilization of corncob acid hydrolysate.•32.8 g/L butyrate at a productivity of 0.29 g/L·h and yield of 0.40 g/g was obtained. Resistance to furan derivatives and phenolic compounds plays an important role in the use of lignocellulosic biomass for biological production of chemicals and fuels. This study confirmed that expression of short-chain dehydrogenase/reductase (SDR) from Clostridium beijerinckii NCIMB 8052 significantly improved the tolerance of C. tyrobutyricum to furfural due to the enhanced activity for furfural reduction. And on this basis, co-expression of SDR and heat shock chaperones GroESL could simultaneously enhance the tolerance of C. tyrobutyricum to furan derivatives and phenolic compounds, which were the main inhibitors presented in dilute-acid lignocellulosic hydrolysates. Consequently, the recombinant strain ATCC 25755/sdr+groESL exhibited good performance in butyric acid production with corncob acid hydrolysate as the substrate. Batch fermentation in bioreactor showed that the butyrate produced by ATCC 25755/sdr+groESL was 32.8 g/L, increased by 28.1% as compared with the wild-type strain. Meanwhile, the butyrate productivity increased from 0.19 g/L·h to 0.29 g/L·h.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2018.09.095