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Journal of Bacteriology logoLink to Journal of Bacteriology
. 1985 Oct;164(1):51–56. doi: 10.1128/jb.164.1.51-56.1985

Marker-exchange mutagenesis of a pectate lyase isozyme gene in Erwinia chrysanthemi.

D L Roeder, A Collmer
PMCID: PMC214209  PMID: 2995324

Abstract

The phytopathogenic enterobacterium Erwinia chrysanthemi contains pel genes encoding several different isozymes of the plant-tissue-disintegrating enzyme pectate lyase (PL). The pelC gene, encoding an isozyme with an approximate isoelectric point of 8.0, was mutagenized by a three-step procedure involving (i) insertional inactivation of the cloned gene by ligation of a kan-containing BamHI fragment from pUC4K with a partial Sau3A digest of E. chrysanthemi pelC DNA in pBR322; (ii) mobilization of the pBR322 derivative from Escherichia coli to E. chrysanthemi by the helper plasmids R64drd11 and pLVC9; and (iii) exchange recombination of the pelC::kan mutation into the E. chrysanthemi chromosome by selection for kanamycin resistance in transconjugants cultured in phosphate-limited medium (which renders pBR322 unstable). The resulting E. chrysanthemi mutant was Kanr Amps, lacked pBR322 sequences, and was deficient in only one of the four major PL isozymes, PLc, as determined by activity-stained isoelectric-focusing polyacrylamide gels. The rates of PL induction and cell growth in a medium containing polygalacturonic acid as the sole carbon source were not significantly reduced in the mutant. No difference was detected in the ability of the mutant to macerate potato tuber tissue. The evidence suggests that this isozyme is not necessary for soft-rot pathogenesis.

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Selected References

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