Transcriptome analysis revealed that a quorum sensing system regulates the transfer of the pAt megaplasmid in Agrobacterium tumefaciens

Mhedbi-Hajri Nadia, Yahiaoui Noura, Mondy Samuel, Hue Nathalie, Pelissier Cyril, Faure Denis, Dessaux Y.. 2016. Transcriptome analysis revealed that a quorum sensing system regulates the transfer of the pAt megaplasmid in Agrobacterium tumefaciens. BMC Genomics, 17 (661), 14 p.

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Abstract : Background: Agrobacterium tumefaciens strain P4 is atypical, as the strain is not pathogenic and produces a for this species unusual quorum sensing signal, identified as N-(3-hydroxy-octanoyl)-homoserine lactone (3OH,C8-HSL). Results: By sequence analysis and cloning, a functional luxI-like gene, named cinI, has been identified on the At plasmid of A. tumefaciens strain P4. Insertion mutagenesis in the cinI gene and transcriptome analyses permitted the identification of 32 cinI-regulated genes in this strain, most of them encoding proteins responsible for the conjugative transfer of pAtP4. Among these genes were the avhB genes that encode a type 4 secretion system (T4SS) involved in the formation of the conjugation apparatus, the tra genes that encode the DNA transfer and replication (Dtr) machinery and cinI and two luxR orthologs. These last two genes, cinR and cinX, exhibit an unusual organization, with the cinI gene surrounded by the two luxR orthologs. Conjugation experiments confirmed that the conjugative transfer of pAtP4 is regulated by 3OH,C8-HSL. Root colonization experiments indicated that the quorum sensing regulation of the conjugation of the pAtP4 does not confer a gain or a loss of fitness to the bacterial host in the tomato plant rhizosphere. Conclusion: This work is the first identification of the occurrence of a quorum sensing regulation of the pAt conjugation phenomenon in Agrobacterium. (résumé d'auteur)

Mots-clés Agrovoc : Agrobacterium tumefaciens, Transcription génique, Plasmide, Lactone, Bactériologie, Biologie moléculaire, Identification, Propriété biologique, Séquence nucléotidique, Expression des gènes, Dynamique des populations

Mots-clés géographiques Agrovoc : France

Mots-clés complémentaires : Séquencage

Mots-clés libres : Agrobacterium, At plasmid, Transcriptomics, Conjugation, T4SS, Dtr system, Acylhomoserine lactone, Quorum sensing

Classification Agris : H20 - Plant diseases
000 - Other themes

Champ stratégique Cirad : Axe 4 (2014-2018) - Santé des animaux et des plantes

Auteurs et affiliations

  • Mhedbi-Hajri Nadia, CNRS (FRA)
  • Yahiaoui Noura, CIRAD-BIOS-UMR PVBMT (REU)
  • Mondy Samuel, CNRS (FRA)
  • Hue Nathalie, CNRS (FRA)
  • Pelissier Cyril
  • Faure Denis, CNRS (FRA)
  • Dessaux Y., CNRS (FRA)

Source : Cirad-Agritrop (

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