Mathiesen G, Sørvig E, Blatny J, Naterstad K, Axelsson L, Eijsink VGH. High-level gene expression in Lactobacillus plantarum using a pheromone-regulated bacteriocin promoter.
Lett Appl Microbiol 2004;
39:137-43. [PMID:
15242451 DOI:
10.1111/j.1472-765x.2004.01551.x]
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Abstract
AIMS
To use promoters and regulatory genes involved in the production of the bacteriocin sakacin P to obtain high-level regulated gene expression in Lactobacillus plantarum.
METHODS AND RESULTS
In a plasmid containing all three operons naturally involved in sakacin P production, the genes encoding sakacin P and its immunity protein were replaced by the aminopeptidase N gene from Lactococcus lactis (pepN) or the beta-glucuronidase gene from Escherichia coli (gusA). The new genes were precisely fused to the start codon of the sakacin P gene and the stop codon of the immunity gene. This set-up permitted regulated (external pheromone controlled) overexpression of both reporter genes in L. plantarum NC8. For PepN, production levels amounted to as much as 40% of total cellular protein.
CONCLUSIONS
Promoters and regulatory genes involved in production of sakacin P are suitable for establishing inducible high-level gene expression in L. plantarum.
SIGNIFICANCE AND IMPACT OF THE STUDY
This study describes a system for controllable gene expression in lactobacilli, giving some of the highest expression levels reported so far in this genus.
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