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A new major outer membrane protein in derivatives of Escherichia coli carrying the virulence plasmid ColV‐K94
Author(s) -
Moores Jane C.,
Rowbury R. J.
Publication year - 1982
Publication title -
zeitschrift für allgemeine mikrobiologie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.58
H-Index - 54
eISSN - 1521-4028
pISSN - 0044-2208
DOI - 10.1002/jobm.19820220706
Subject(s) - colicin , escherichia coli , bacterial outer membrane , plasmid , biology , trypsin , membrane protein , virulence , microbiology and biotechnology , bacteriocin , biochemistry , bacteria , chemistry , membrane , gene , enzyme , genetics
Strains of Escherichia coli K12 harbouring ColV‐K94 contain a new major outer membrane protein of molecular weight ca. 33,000. The new protein resembles the Omp A protein in that (1) it is trypsin‐sensitive in membrane preparations and (2) it is not murein‐associated. The new protein cannot, however, replace the Omp A protein as a functional receptor for the phages K3 and Tull*, for colicin L or for efficient conjugation with F‐like donors. The new protein is apparently not a transfer component and is produced by cells unable to produce colicin. Labelling experiments with minicells suggest that the new protein is one of two major plasmid‐encoded membrane proteins.