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J Bacteriol. 1994 January; 176(2): 359-367

research-article

New outer membrane-associated protease of Escherichia coli K-12.

A Kaufmann, Y D Stierhof and U Henning

Max-Planck-Institut für Biologie, Tübingen, Germany.

ABSTRACT

The gene for a new outer membrane-associated protease, designated OmpP, of Escherichia coli has been cloned and sequenced. The gene encodes a 315-residue precursor protein possessing a 23-residue signal sequence. Including conservative substitutions and omitting the signal peptides, OmpP is 87% identical to the outer membrane protease OmpT. OmpP possessed the same enzymatic activity as OmpT. Immuno-electron microscopy demonstrated the exposure of the protein at the cell surface. Digestion of intact cells with proteinase K removed 155 N-terminal residues of OmpP, while the C-terminal half remained protected. It is possible that much of this N-terminal part is cell surface exposed and carries the enzymatic activity. Synthesis of OmpP was found to be thermoregulated, as is the expression of ompT (i.e., there is a low rate of synthesis at low temperatures) and, in addition, was found to be controlled by the cyclic AMP system.

J Bacteriol. 1994 January; 176(2): 359-367




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