PMID: 9171393Jun 1, 1997Paper

The cyclic AMP receptor protein is the main activator of pectinolysis genes in Erwinia chrysanthemi

Journal of Bacteriology
S ReverchonWilliam Nasser

Abstract

The main virulence factors of the phytopathogenic bacterium Erwinia chrysanthemi are pectinases that cleave pectin, a major constituent of the plant cell wall. Although physiological studies suggested that pectinase production in Erwinia species is subjected to catabolite repression, the direct implication of the cyclic AMP receptor protein (CRP) in this regulation has never been demonstrated. To investigate the role of CRP in pectin catabolism, we cloned the E. chrysanthemi crp gene by complementation of an Escherichia coli crp mutation and then constructed E. chrysanthemi crp mutants by reverse genetics. The carbohydrate fermentation phenotype of the E. chrysanthemi crp mutants is similar to that of an E. coli crp mutant. Furthermore, these mutants are unable to grow on pectin or polygalacturonate as the sole carbon source. Analysis of the nucleotide sequence of the E. chrysanthemi crp gene revealed the presence of a 630-bp open reading frame (ORF) that codes for a protein highly similar to the CRP of E. coli. Using a crp::uidA transcriptional fusion, we demonstrated that the E. chrysanthemi CRP represses its own expression, probably via a mechanism similar to that described for the E. coli crp gene. Moreover, in the E. chrys...Continue Reading

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Citations

Sep 14, 2001·Molecular Microbiology·N Hugouvieux-Cotte-Pattat, S Reverchon
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