title: Modified lactic acid bacteria detect and inhibit multiresistant enterococci.
abstract: 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.
authors.affiliation: †Department of Chemical Engineering and Materials Science, ‡Department of Microbiology, University of Minnesota, Minneapolis, Minnesota 55455, United States.
authors.forename: Juan
authors.initials: J
authors.lastname: Borrero
authors.affiliation: †Department of Chemical Engineering and Materials Science, ‡Department of Microbiology, University of Minnesota, Minneapolis, Minnesota 55455, United States.
authors.forename: Yuqing
authors.initials: Y
authors.lastname: Chen
authors.affiliation: †Department of Chemical Engineering and Materials Science, ‡Department of Microbiology, University of Minnesota, Minneapolis, Minnesota 55455, United States.
authors.forename: Gary M
authors.initials: GM
authors.lastname: Dunny
authors.affiliation: †Department of Chemical Engineering and Materials Science, ‡Department of Microbiology, University of Minnesota, Minneapolis, Minnesota 55455, United States.
authors.forename: Yiannis N
authors.initials: YN
authors.lastname: Kaznessis
mesh_terms: D000900:Anti-Bacterial Agents / Q000378:metabolism / Q000494:pharmacology*; D003086:Bacteriocin Plasmids / Q000235:genetics*; D001430:Bacteriocins / Q000235:genetics / Q000378:metabolism / Q000494:pharmacology*; D015374:Biosensing Techniques / Q000379:methods*; D013293:Enterococcus faecalis / Q000187:drug effects* / Q000302:isolation & purification*; D013294:Lactococcus lactis / Q000235:genetics* / Q000378:metabolism; D011994:Recombinant Proteins / Q000235:genetics / Q000378:metabolism / Q000494:pharmacology
chemical_list: D000900:Anti-Bacterial Agents; D001430:Bacteriocins; D011994:Recombinant Proteins
keywords: Enterococcus faecalis; Lactococcus lactis; drug delivery vector; lactic acid bacteria; recombinant plasmids