Abstract
Objectives
To reduce the unpleasant odor during 1-deoxynojirimycin (DNJ) production, the genes of leucine dehydrogenase (bcd) and phosphate butryltransferase (ptb) were deleted from Bacillus amyloliquefaciens HZ-12, and the concentrations of branched-chain short fatty acids (BCFAs) and DNJ were compared.
Results
By knockout of the ptb gene, 1.01 g BCFAs kg−1 was produced from fermented soybean by HZ-12Δptb. This was a 56% decrease compared with that of HZ-12 (2.27 g BCFAs kg−1). Moreover, no significant difference was found in the DNJ concentration (0.7 g kg−1). After further deletion of the bcd gene from HZ-12Δptb, no BCFAs was detected in fermented soybeans with HZ-12ΔptbΔbcd, while the DNJ yield decreased by 26% compared with HZ-12.
Conclusions
HZ-12Δptb had decreased BCFAs formation but also maintained the stable DNJ yield, which contributed to producing DNJ-rich products with decreased unpleasant smell.
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Acknowledgments
This work was funded by the National Natural Science Foundation of China (31501468) and the Fundamental Research Funds for the Central Universities (2662016PY121).
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Supplementary Table 1—Strains and plasmids used.
Supplementary Table 2—Primers used for PCR.
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Chen, Y., Liu, M., Chen, S. et al. Decreased formation of branched-chain short fatty acids in Bacillus amyloliquefaciens by metabolic engineering. Biotechnol Lett 39, 529–533 (2017). https://doi.org/10.1007/s10529-016-2270-5
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DOI: https://doi.org/10.1007/s10529-016-2270-5