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. 1990 Oct;172(10):5803–5815. doi: 10.1128/jb.172.10.5803-5815.1990

Cloning of genes encoding extracellular metalloproteases from Erwinia chrysanthemi EC16.

G S Dahler 1, F Barras 1, N T Keen 1
PMCID: PMC526898  PMID: 2211513

Abstract

A 14-kilobase BamHI-EcoRI DNA fragment cloned from Erwinia chrysanthemi EC16 contained a gene encoding a metalloprotease inhibitor as well as three tandem prt genes encoding metalloproteases. The prt genes were separated from the inhibitor gene by a ca. 4-kilobase region that was necessary for extracellular secretion of the proteases. When individually subcloned downstream from vector promoters, the three prt genes each led to substantial extracellular secretion of the proteases by Escherichia coli cells, provided that the 4-kilobase required region was supplied in cis or trans. One of the protease structural genes, prtC, was sequenced and had high homology to a metalloprotease gene previously described from Serratia species as well as to the prtB gene of E. chrysanthemi B374. Marker exchange mutants of E. chrysanthemi EC16 defective in production of one or all of the extracellular proteases were not impaired in virulence on plant tissue.

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Selected References

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