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pubmed-article:16789148pubmed:dateCreated2010-6-29lld:pubmed
pubmed-article:16789148pubmed:abstractTextUnder 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.lld:pubmed
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pubmed-article:16789148pubmed:authorpubmed-author:SmithDDlld:pubmed
pubmed-article:16789148pubmed:authorpubmed-author:SchnaitmanCClld:pubmed
pubmed-article:16789148pubmed:authorpubmed-author:de SalsasM...lld:pubmed
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pubmed-article:16789148pubmed:volume15lld:pubmed
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pubmed-article:16789148pubmed:pagination1121-30lld:pubmed
pubmed-article:16789148pubmed:dateRevised2010-9-15lld:pubmed
pubmed-article:16789148pubmed:year1975lld:pubmed
pubmed-article:16789148pubmed:articleTitleTemperate Bacteriophage Which Causes the Production of a New Major Outer Membrane Protein by Escherichia coli.lld:pubmed
pubmed-article:16789148pubmed:affiliationDepartment of Microbiology, The University of Virginia, Charlottesville, Virginia 22901.lld:pubmed
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