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Appl Environ Microbiol. 1988 November; 54(11): 2808-2811
Copyright © 1988, American Society for Microbiology. All Rights Reserved.

Properties of the Cell Walls of Lactococcus lactis subsp. cremoris SK110 and SK112 and Their Relation to Bacteriophage Resistance

Lolke Sijtsma*, Aart Sterkenburg{dagger} and Jan T. M. Wouters{ddagger}

Biotechnology Centre, Laboratory of Microbiology, University of Amsterdam, Nieuwe Achtergracht 127, 1018 WS Amsterdam, The Netherlands

ABSTRACT

Resistance of Lactococcus lactis subsp. cremoris SK110 to bacteriophage sk11G, encoded on the plasmid pSK112, is due to poor phage adsorption. Its phage-sensitive variant SK112, cured of pSK112, adsorbs phages effectively. Incubation of SK112 with concanavalin A remarkably reduced phage adsorption to this strain. This treatment also caused agglutination of SK112 that was not found with SK110, indicating different concanavalin A adsorption characteristics of cell walls of both strains. The differences between the two strains were reduced by a mild alkali treatment of cells. This resulted in a positive agglutination with concanavalin A for both strains and in parallel adsorption of phage sk11G to both. Moreover, isolated cell walls of the two strains were investigated, and both bound phage sk11G. These observations suggest the presence of phage receptor material in SK112 as well as in SK110. SK110 contained a relatively high level of bound galactose when compared with the phage-sensitive SK112. After the mild alkali treatment, however, the galactose content of SK110 was diminished such that it became comparable with that of SK112. It is hypothesized that the alkali treatment liberates a galactose-containing component from the cell wall and causes phage sensitivity in L. lactis subsp. cremoris SK110.

FOOTNOTES

* Corresponding author.

{dagger} Present address: Rijksinstituut voor Volksgezondheid en Milieuhygiene, 3720 BA Bilthoven, The Netherlands.

{ddagger} Present address: The Netherlands Institute for Dairy Research, 6710 BA Ede, The Netherlands.

Appl Environ Microbiol. 1988 November; 54(11): 2808-2811
Copyright © 1988, American Society for Microbiology. All Rights Reserved.



This article has been cited by other articles:

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