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. 1975 Feb;121(2):465–470. doi: 10.1128/jb.121.2.465-470.1975

Blocking of bacteriophages phi W and phi 5 with lipopolysaccharides from Escherichia coli K-12 mutants.

H G Boman, D A Monner
PMCID: PMC245953  PMID: 1089629

Abstract

In the preceding paper we presented a formula for the composition of lipopolysaccharides (LPS) from Escherichia coli K-12. This formula contains four regions defined from analyses of LPS from four key strains, the parent and mutants which had lost one, two, or three regions of their carbohydrates. Support for the formula was derived from the susceptibility of the key mutants to several bacteriophages. One of these, phage phi W, was found specific for strains which had lost region 4. In this paper we described inactivation in vitro of phage phi W and its host-range mutant phi 5, using LPS devoid of regions 2 to 4. The blocking of phi W was found to require about 0.15 M concentrations of monovalent cations and to be inhibited by low concentrations of calcium and magnesium ions. One particle of phage phi W required 2 times 10-16 g of LPS devoid of region 4 for stoichiometric inactivation. Phage phi 5 was blocked by both heptose-less LPS (devoid of regions 2 to 4) and glucose-less LPS (devoid of regions 3 to 4) but was unaffected by LPS devoid of region 4. LPS from a heptose-less mutant of Salmonella minnesota showed the same inactivation ability as did LPS from heptose-less strains of E. coli K-12. Lipid A was prepared from LPS containing all four regions. Such lipid A was found to inactivate phi 5, whereas both the polysaccharide moiety as well as the intact LPS were without effect. It is suggested that lipid A is part of the receptor site for phage phi 5.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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