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Enhanced butyric acid tolerance and production by Class I heat shock protein-overproducing Clostridium tyrobutyricum ATCC 25755

  • Bioenergy/Biofuels/Biochemicals - Original Paper
  • Published:
Journal of Industrial Microbiology & Biotechnology

Abstract

The response of Clostridium tyrobutyricum to butyric acid stress involves various stress-related genes, and therefore overexpression of stress-related genes can improve butyric acid tolerance and yield. Class I heat shock proteins (HSPs) play an important role in the process of protecting bacteria from sudden changes of extracellular stress by assisting protein folding correctly. The results of quantitative real-time PCR indicated that the Class I HSGs grpE, dnaK, dnaJ, groEL, groES, and htpG were significantly upregulated under butyric acid stress, especially the dnaK and groE operons. Overexpression of groESL and htpG could significantly improve the tolerance of C. tyrobutyricum to butyric acid, while overexpression of dnaK and dnaJ showed negative effects on butyric acid tolerance. Acid production was also significantly promoted by increased GroESL expression levels; the final butyric acid and acetic acid concentrations were 28.2 and 38% higher for C. tyrobutyricum ATCC 25755/groESL than for the wild-type strain. In addition, when fed-batch fermentation was carried out using cell immobilization in a fibrous-bed bioreactor, the butyric acid yield produced by C. tyrobutyricum ATCC 25755/groESL reached 52.2 g/L, much higher than that for the control. The improved butyric acid yield is probably attributable to the high GroES and GroEL levels, which can stabilize the biosynthetic machinery of C. tyrobutyricum under extracellular butyric acid stress.

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Acknowledgements

This work was supported by the Natural Science Foundation of China (21276093) and the Planned Science and Technology Project of Guangdong Province, China (2015A050502014).

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  1. School of Bioscience & Bioengineering, South China University of Technology, Guangzhou, 510006, China

    Yukai Suo, Sheng Luo, Yanan Zhang, Zhengping Liao & Jufang Wang

  2. State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, 510640, China

    Jufang Wang

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Suo, Y., Luo, S., Zhang, Y. et al. Enhanced butyric acid tolerance and production by Class I heat shock protein-overproducing Clostridium tyrobutyricum ATCC 25755. J Ind Microbiol Biotechnol 44, 1145–1156 (2017). https://doi.org/10.1007/s10295-017-1939-7

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