6533b862fe1ef96bd12c72e3
RESEARCH PRODUCT
Pseudomonas corrugata crpCDE is part of the cyclic lipopeptide corpeptin biosynthetic gene cluster and is involved in bacterial virulence in tomato and in hypersensitive response in Nicotiana benthamiana
C. P. StranoP. BellaG. LicciardelloA. FioreAngela Roberta Lo PieroV. FoglianoV. VenturiVittoria Catarasubject
DNA BacteriallipodepsipeptidesABC transporters corpeptins Lux R transcriptional regulators non-ribosomal peptide synthetase Pseudomonas.chromobacterium-violaceumcloningPeptides CyclicLipopeptidesSolanum lycopersicumPseudomonasABC transporters Lux R transcriptional regulators non-ribosomal peptide synthetaseTobaccoPeptide SynthasesLux R transcriptional regulatorsnon-ribosomal peptide synthetasePhylogenyVLAGPlant DiseasesCell-Free SystemVirulenceputisolvin-iisyringae pv.-syringaeSettore AGR/12 - Patologia VegetaleOriginal Articlesgram-negative bacteriapeptideBiosynthetic PathwayssyringomycinRepressor ProteinssyringopeptinFood Quality and DesignABC transportersGenesGenes BacterialMultigene FamilyHost-Pathogen InteractionsMutationTrans-ActivatorsATP-Binding Cassette Transportersquorum-sensing systemdescription
Summary: Pseudomonas corrugataCFBP 5454 produces two kinds of cyclic lipopeptides (CLPs), cormycin A and corpeptins, both of which possess surfactant, antimicrobial and phytotoxic activities. In this study, we identified genes coding for a putative non-ribosomal peptide synthetase and an ABC-type transport system involved in corpeptin production. These genes belong to the same transcriptional unit, designated crpCDE. The genetic organization of this locus is highly similar to other PseudomonasCLP biosynthetic clusters. Matrix-assisted laser desorption ionization-time of flight-mass spectrometry (MALDI-TOF-MS) analysis revealed that transporter and synthetase genomic knock-out mutants were unable to produce corpeptins, but continued to produce cormycin A. This suggests that CrpCDE is the only system involved in corpeptin production in P.corrugataCFBP 5454. In addition, phylogenetic analysis revealed that the CrpE ABC transporter clustered with the transporters of CLPs with a long peptide chain. Strains depleted in corpeptin production were significantly less virulent than the wild-type strain when inoculated in tomato plants and induced only chlorosis when infiltrated into Nicotiana benthamiana leaves. Thus, corpeptins are important effectors of P.corrugata interaction with plants. Expression analysis revealed that crpC transcription occurs at high cell density. Two LuxR transcriptional regulators, PcoR and RfiA, have a pivotal role in crpC expression and thus in corpeptin production.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2014-09-19 |