Journal
ACS SYNTHETIC BIOLOGY
Volume 4, Issue 3, Pages 299-306Publisher
AMER CHEMICAL SOC
DOI: 10.1021/sb500090b
Keywords
lactic acid bacteria; Lactococcus lactis; Enterococcus faecalis; drug delivery vector; recombinant plasmids
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Funding
- National Institutes of Health [GM086865, GM049530]
- National Science Foundation [CBET-0644792]
- University of Minnesota Biotechnology Institute
- NATIONAL INSTITUTE OF GENERAL MEDICAL SCIENCES [R01GM111358, R01GM086865, R01GM049530] Funding Source: NIH RePORTER
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We designed Lactococcus lactis to detect Enterococcus faecalis. Upon detection, L. lactis produce and secrete antienterococcal peptides. The peptides inhibit enterococcal growth and reduce viability of enterococci in the vicinity of L. lactis. The enterococcal sex pheromone cCF10 serves as the signal for detection. Expression vectors derived from pCF10, a cCF10-responsive E. faecalis sex-pheromone conjugative plasmid, were engineered in L. lactis for the detection system. Recombinant host strains were engineered to express genes for three bacteriocins, enterocin A, hiracin JM79 and enterocin P, each with potent antimicrobial activity against E. faecalis. Sensitive detection and specific inhibition occur both in agar and liquid media. The engineered L. lactis also inhibited growth of multidrug-resistant E. faecium strains, when induced by cCF10. The presented vectors and strains can be components of a toolbox for the development of alternative antibiotic technologies targeting enterococci at the site of infection.
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