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. 1985 Aug;55(2):374–378. doi: 10.1128/jvi.55.2.374-378.1985

Neuraminidase associated with coliphage E that specifically depolymerizes the Escherichia coli K1 capsular polysaccharide.

S Tomlinson, P W Taylor
PMCID: PMC254943  PMID: 3894684

Abstract

Plaque morphology indicated that the five Escherichia coli K1-specific bacteriophages (A to E) described by Gross et al. (R. J. Gross, T. Cheasty, and B. Rowe, J. Clin. Microbiol. 6:548-550, 1977) encode K1 depolymerase activity that is present in both the bound and free forms. The free form of the enzyme from bacteriophage E was purified 238-fold to apparent homogeneity and in a high yield from ammonium sulfate precipitates of cell lysates by a combination of CsCl density gradient ultracentrifugation, gel filtration, and anion-exchange chromatography. The enzyme complex had an apparent molecular weight of 208,000, as judged from its behavior on sodium dodecyl sulfate-polyacrylamide gel electrophoresis, and was dissociated by sodium dodecyl sulfate at 100 degrees C to yield two polypeptides with apparent molecular weights of 74,000 and 38,500. Optimum hydrolytic activity was observed at pH 5.5, and activity was strongly inhibited by Ca2+; the Km was 7.41 X 10(-3) M. Rapid hydrolysis of both the O-acetylated and non-O-acetylated forms of the K1 antigen, an alpha 2----8-linked homopolymer of N-acetylneuraminic acid, and of the meningococcus B antigen was observed. Limited hydrolysis of the E. coli K92 antigen, an N-acetylneuraminic acid homopolymer containing alternating alpha 2----8 and alpha 2----9 linkages, occurred, but the enzyme failed to release alpha 2----3-, alpha 2----6-, or alpha 2----9-linked sialic residues from a variety of other substrates.

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Selected References

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