The plasmid complement of Lactococcus lactis UC509.9 encodes multiple bacteriophage resistance systems.

ABSTRACT: Lactococcus lactis subsp. cremoris strains are used globally for the production of fermented dairy products, particularly hard cheeses. Believed to be of plant origin, L. lactis strains that are used as starter cultures have undergone extensive adaptation to the dairy environment, partially through the acquisition of extrachromosomal DNA in the form of plasmids that specify technologically important phenotypic traits. Here, we present a detailed analysis of the eight plasmids of L. lactis UC509.9, an Irish dairy starter strain. Key industrial phenotypes were mapped, and genes that are typically associated with lactococcal plasmids were identified. Four distinct, plasmid-borne bacteriophage resistance systems were identified, including two abortive infection systems, AbiB and AbiD1, thereby

SUBMITTER: Ainsworth S 

PROVIDER: S-EPMC4068662 | biostudies-literature | 2014 Jul

REPOSITORIES: biostudies-literature