Identification of a Pathogenicity locus, rpfA, in Erwinia carotovora subsp. carotovora that encodes a two-component sensor-regulator protein

Reid D. Frederick, Jiliang Chiu, Jeffrey L. Bennetzen, Autar K. Handa

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44 Scopus citations

Abstract

A mutant of Erwinia carotovora subsp. carotovora, AH2552, created by a Mud1 insertion was found to be reduced in plant pathogenicity and deficient in extracellular protease and cellulase activity, although it produced normal levels of pectate lyase and polygalacturonase. A cosmid clone, pEC462, was isolated from a wild-type E. carotovora subsp. carotovora DNA library that concomitantly restored pathogenicity and protease and cellulase activities of AH2552 to wild-type levels when present in trans. The genetic locus that was disrupted in AH2552 by insertion of Mud1 has been designated rpfA, for regulator of pathogenicity factors. Sequencing of the rpfA region identified an open reading frame of 2,787 bp, and the predicted 929-amino acid polypeptide shared high identity with several two-component sensor-regulator proteins: BarA from Escherichia coli, Apda from Pseudomonas fluorescens, PheN from P. tolaasii, RepA from P. viridiflava, LemA from P. syringae pv. syringae, and RpfC from Xanthomonas cam pestris pv. campestris. The RpfA locus described in this study encodes a putative sensor kinase protein that is involved in both extracellular protease and cellulase production and the pathogenicity of E. carotovora subsp. carotovora on potato tubers.

Original languageEnglish (US)
Pages (from-to)407-415
Number of pages9
JournalMolecular Plant-Microbe Interactions
Volume10
Issue number3
DOIs
StatePublished - Apr 1997

All Science Journal Classification (ASJC) codes

  • Physiology
  • Agronomy and Crop Science

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