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. 1975 May;15(5):1121–1130. doi: 10.1128/jvi.15.5.1121-1130.1975

Temperate Bacteriophage Which Causes the Production of a New Major Outer Membrane Protein by Escherichia coli

Carl Schnaitman 1, Deborah Smith 1, Montserrat Forn de Salsas 1
PMCID: PMC354566  PMID: 16789148

Abstract

Under most conditions of growth, the most abundant protein in the outer membrane of most strains of Escherichia coli is a protein designated as “protein 1” or “matrix protein”. In E. coli B, this protein has been shown to be a single polypeptide with a molecular mass of 36,500 and it may account for more than 50% of the total outer membrane protein. E. coli K-12 contains a very similar, although probably not identical, species of protein 1. Some pathogenic E. coli strains contain very little protein 1 and, in its place, make a protein designated as protein 2 which migrates faster on alkaline polyacrylamide gels containing sodium dodecyl sulfate and which gives a different spectrum of CNBr peptides. An E. coli K-12 strain which had been mated with a pathogenic strain was found to produce protein 2, and a temperate bacteriophage was isolated from this K-12 strain after induction with UV light. This phage, designated as PA-2, is similar in morphology and several other properties to phage lambda. When strains of E. coli K-12 are lysogenized by phage PA-2, they produce protein 2 and very little protein 1. Adsorption to lysogenic strains grown under conditions where they produce little protein 1 and primarily protein 2 is greatly reduced as compared to non-lysogenic strains which produce only protein 1. However, when cultures are grown under conditions of catabolite repression, protein 2 is reduced and protein 1 is increased, and lysogenic and non-lysogenic cultures grown under these conditions exhibit the same rate of adsorption. Phage PA-2 does not adsorb to E. coli B, which appears to have a slightly different protein 1 from K-12. These results suggest that protein 1 is the receptor for PA-2, and that protein 2 is made to reduce the superinfection of lysogens.

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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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