Abstract
AIM
To develop an inducible gene expression system for Lactobacillus sakei, based on the regulatory system of sakacin A production.
METHODS AND RESULTS
A Lactobacillus/Escherichia coli shuttle vector; pKRV3, was constructed including the signal transducing system genes of the bacteriocin sakacin A. The gusA gene fused to PsapA promoter, cloned in this vector allowed for inducible beta-glucuronidase expression in L. sakei and L. plantarum following the addition of the sakacin A inducing peptide. PsapA appeared to be a strong and tightly controlled promoter when compared with known promoters.
CONCLUSION
The pKRV3 system can be used as an inducible gene expression system in lactobacilli.
SIGNIFICANCE AND IMPACT OF THE STUDY
A novel, inducible gene expression system has been developed for lactic acid bacteria relevant in food fermentations.
Collapse