Study on Mechanism of γ-PGA and Nattokinase Produced by Bacillus Subtilis Natto Based on RNA-Seq Analysis [post]

Min Li, Zilong Zhang, Shenwei Li, Zhengan Tian, Xia Ma
2020 unpublished
Poly-γ-glutamic acid (γ-PGA) and nattokinase (NK) are the main substances produced by Bacillus subtilis natto in solid-state fermentation and have wide application prospects. We found that our strains have higher nattokinase activity when soybean is used as a substrate to improve the yield of γ-PGA. Commercial production of γ-PGA and nattokinase requires an understanding of the co-production mechanism. Here, we monitored the metabolites of the fermentation process firstly, analyzed the
more » ... alyzed the transcriptome of Bacillus subtilis natto when co-producing γ-PGA and NK, and obtained the maximum γ-PGA yield (11.39 ± 0.38%, w/w) and highest activity of NK during fermentation. By comparing the up-regulated genes and down-regulated genes of key enzymes and product-related metabolic pathways for genetic engineering, the co-production mechanism of γ-PGA and nattokinase can be summarized. This study firstly provides new insights into the co-production mechanism of γ-PGA and nattokinase by Bacillus subtilis natto, and reveals potential molecular targets for promoting the co-production of γ-PGA and nattokinase.
doi:10.21203/ fatcat:q2ufalo77ngqhbp25fiyzpbdva