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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Cloning and DNA sequence analysis of a Lactococcus bacteriophage lysin gene.
Molecular & General Genetics : MGG 1989 August
A gene for the lysin of Lactococcus lactis bacteriphage phi vML3 was cloned using an Escherichia coli/bacteriophage lambda host-vector system. The gene was detected by its expression of antimicrobial activity against L. lactis cells in a bioassay. The cloned fragment was analysed by sub-cloning on to E. coli plasmid vectors and by restriction endonuclease and deletion mapping. Its entire DNA sequence was determined and an open reading frame for the lysin structural gene was identified. The sequenced lysin gene would express a protein of 187 amino acids with a molecular weight of 21,090, which is in good agreement with that of a protein detected after in vitro transcription and translation of DNA encoding the gene. Expression of the lysin gene in E. coli and B. subtilis from an adjacent bacteriophage promoter was readily detected but in L. lactis expression of lysin was found to be lethal. The bacteriophage phi vML3 lysin had sequence homology with protein 15 of B. subtilis bacteriophage PZA. This protein is involved in DNA packaging during bacteriophage maturation rather than in host cell lysis. The cloning and analysis of the phi vML3 lysin gene is of importance in further understanding lactic streptococcal bacteriophages, for the development of positive selection vectors and for biotechnological applications of relevance to the dairy industry.
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