Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
5
pubmed:dateCreated
1998-3-5
pubmed:abstractText
The main virulence factors of the phytopathogenic bacteria Erwinia chrysanthemi are pectinases that cleave pectin, a major constituent of the plant cell wall. The cyclic AMP receptor protein (CRP) was identified as the main activator of the pectinolysis genes. Gel shift and DNase I footprinting experiments showed that the purified E. chrysanthemi CRP protein binds specifically to the promoter regions of seven pectinolysis genes (pelB, pelC, pelD, pelE, ogl, kduI and kdgT) whose expression is positively regulated in vivo by CRP. In contrast, no interaction was observed between CRP and the promoter-operator region of pelA, whose expression is negatively regulated in vivo by CRP. Primer extension experiments demonstrated that each of the pelB, pelC, pelE and kduI genes is expressed from a unique sigma70 promoter, whereas ogl and kdgT possess three and two functional promoters respectively. The position of the CRP binding site relative to the transcription start site suggests that CRP acts as a primary activator at the pelB (via the CRP binding site 1), pelC, pelE, pelD, kdgTP1 and oglP2 promoters. In contrast, transcription at the kduI, oglP1 promoters seems to require another transcriptional activator in synergy with CRP. Investigation of the simultaneous binding of CRP and KdgR, the main repressor of pectinolysis genes, to the regulatory regions of pelB, pelC, pelD, pelE, ogl, kduI and kdgT genes showed that binding of KdgR is preferential and exclusive in the case of ogl and kdgT, whereas the binding of these two regulators is independent in the case of pelB, pelC, pelD, pelE and kduI. Taken together, our data suggest that the antagonistic effects of CRP and KdgR on the expression of the pectinolysis genes occur by different mechanisms, including direct competition between the two regulators or between the repressor and RNA polymerase for the occupation of a common DNA region on the target genes.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
http://linkedlifedata.com/resource/pubmed/chemical/Bacterial Proteins, http://linkedlifedata.com/resource/pubmed/chemical/Carrier Proteins, http://linkedlifedata.com/resource/pubmed/chemical/Cyclic AMP, http://linkedlifedata.com/resource/pubmed/chemical/Cyclic AMP Receptor Protein, http://linkedlifedata.com/resource/pubmed/chemical/DNA, Bacterial, http://linkedlifedata.com/resource/pubmed/chemical/DNA-Binding Proteins, http://linkedlifedata.com/resource/pubmed/chemical/Deoxyribonuclease I, http://linkedlifedata.com/resource/pubmed/chemical/Isoenzymes, http://linkedlifedata.com/resource/pubmed/chemical/KdgR protein, Erwinia chrysanthemi, http://linkedlifedata.com/resource/pubmed/chemical/PelE protein, Erwinia chrysanthemi, http://linkedlifedata.com/resource/pubmed/chemical/Polygalacturonase, http://linkedlifedata.com/resource/pubmed/chemical/Polysaccharide-Lyases, http://linkedlifedata.com/resource/pubmed/chemical/Recombinant Fusion Proteins, http://linkedlifedata.com/resource/pubmed/chemical/Repressor Proteins, http://linkedlifedata.com/resource/pubmed/chemical/Transcription Factors, http://linkedlifedata.com/resource/pubmed/chemical/pectate lyase, http://linkedlifedata.com/resource/pubmed/chemical/pectin lyase B
pubmed:status
MEDLINE
pubmed:month
Dec
pubmed:issn
0950-382X
pubmed:author
pubmed:issnType
Print
pubmed:volume
26
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
1071-82
pubmed:dateRevised
2008-11-21
pubmed:meshHeading
pubmed-meshheading:9426143-Bacterial Proteins, pubmed-meshheading:9426143-Base Sequence, pubmed-meshheading:9426143-Carrier Proteins, pubmed-meshheading:9426143-Chromosome Mapping, pubmed-meshheading:9426143-Cyclic AMP, pubmed-meshheading:9426143-Cyclic AMP Receptor Protein, pubmed-meshheading:9426143-DNA, Bacterial, pubmed-meshheading:9426143-DNA-Binding Proteins, pubmed-meshheading:9426143-Deoxyribonuclease I, pubmed-meshheading:9426143-Gene Expression Regulation, Bacterial, pubmed-meshheading:9426143-Isoenzymes, pubmed-meshheading:9426143-Molecular Sequence Data, pubmed-meshheading:9426143-Pectobacterium chrysanthemi, pubmed-meshheading:9426143-Polygalacturonase, pubmed-meshheading:9426143-Polysaccharide-Lyases, pubmed-meshheading:9426143-Promoter Regions, Genetic, pubmed-meshheading:9426143-Recombinant Fusion Proteins, pubmed-meshheading:9426143-Repressor Proteins, pubmed-meshheading:9426143-Transcription, Genetic, pubmed-meshheading:9426143-Transcription Factors
pubmed:year
1997
pubmed:articleTitle
Antagonistic effect of CRP and KdgR in the transcription control of the Erwinia chrysanthemi pectinolysis genes.
pubmed:affiliation
Laboratoire de Génétique Moléculaire des Microorganismes et des Interactions Cellulaires, CNRS UMR 5577, Villeurbanne, France.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't