Enhancing nisin yield by engineering a small noncodding RNA anti41 and inhibiting the expression of glnR in Lactococcus lactis F44.
Biotechnol Lett 2018;
40:941-948. [PMID:
29619745 DOI:
10.1007/s10529-018-2550-3]
[Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2018] [Accepted: 03/31/2018] [Indexed: 01/06/2023]
Abstract
OBJECTIVES
To engineer a small nonconding RNA anti41 to enhance nisin yield by inhibiting the expression of glnR in Lactococcus lactis F44.
RESULTS
We constructed a screening library to determine appropriate artificial sRNAs and obtained a sRNA anti41 that can produce approximately three fold of the inhibitory effect on GlnR. Moreover, the transcription levels of the direct inhibitory targets of GlnR (glnP, glnQ, amtB, and glnK) were dramatically upregulated in the anti41 overexpression strain (F44-anti41), thereby confirming the inhibitory effect of anti41 on GlnR. In addition, anti41 overexpression improved the survival rate of cells by approximately three fold under acid stress, promoted cell growth, and increased nisin yield by 29.83%.
CONCLUSIONS
We were able to provide a novel strategy for the construction of robust high-producing industrial strains.
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