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pCI528 is a 46 kb plasmid, originally isolated from Lactococcus lactis subsp. cremoris UC503, which causes a decrease in bacteriophage adsorption in lactococcal strains. Cell surface characteristics of two pCI528-containing strains, L. lactis subsp. cremoris UC503 and L. lactis subsp. lactis UC505, were compared with those of their isogenic pCI528-cured derivatives, UC563 and MG1363, respectively. Following centrifugation, strains containing pCI528 produced a loose fluffy pellet. The presence of pCI528 also caused a ‘hard’ colony morphology on agar media. The fluffy pellet effect mediated by pCI528 could be eliminated by washing cells in 0.05 M-NaOH, which also restored full sensitivity to phage in the L. lactis subsp. lactis UC505 background. GLC analysis of cell wall material indicated that pCI528-containing hosts had significantly elevated levels of both galactose and rhamnose. Marked alterations in the cell surface of strains harbouring pCI528 were observed in electron micrographs.

Cell surface characteristics of Lactococcus lactis harbouring pCI528, a 46 kb plasmid encoding inhibition of bacteriophage adsorption