Protease secretion by Erwinia chrysanthemi: the specific secretion functions are analogous to those of Escherichia coli alpha-haemolysin.
A 5.5 kb DNA fragment carrying the functions necessary for the specific secretion of the extracellular metalloproteases B and C produced by the Gram-negative phytopathogenic bacterium Erwinia chrysanthemi has been sequenced. The fragment contains four transcribed and translated genes: inh, which codes for a protease inhibitor and is not required for protease secretion, and prtD, prtE and prtF, which share significant homology with the hlyB, hlyD and tolC genes required for alpha-haemolysin secretion in Escherichia coli. Mutations in any of the three prt genes abolish protease secretion. The prtD and prtE products (60 and 50 kd) contain at least one hydrophobic segment and the prtF gene product contains a signal sequence.
24 references, click to expand
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