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We have isolated the structural gene for an outer membrane protein of Salmonella typhi, from a genomic library constructed in bacteriophage lambda 1059, using the Escherichia coli ompC gene as a heterologous probe. E. coli ompC codes for an outer membrane pore protein (porin) that is induced preferentially at high osmolarity and high temperature. The S. typhi ompC-like gene was subcloned in pBR322 and introduced into E. coli HB101 and into P678-54, a minicell-producing strain. In both strains it expressed a 38.5-kDa protein, which was incorporated into the outer membrane envelope and comigrated with an S. typhi outer membrane protein which was expressed both at low and high osmolarity in vivo.
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