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Functional Genetic Analysis Reveals a 2-Alkyl-4-Quinolone Signaling System in the Human Pathogen Burkholderia pseudomallei and Related Bacteria.

Research output: Contribution to Journal/MagazineJournal articlepeer-review

  • Stephen P. Diggle
  • Putthapoom Lumjiaktase
  • Francesca Dipilato
  • Klaus Winzer
  • Mongkol Kunakorn
  • David A. Barrett
  • Siri Ram Chhabra
  • Miguel Cámara
  • Paul Williams
<mark>Journal publication date</mark>07/2006
<mark>Journal</mark>Chemistry and Biology
Issue number7
Number of pages10
Pages (from-to)701-710
Publication StatusPublished
<mark>Original language</mark>English


Pseudomonas aeruginosa synthesizes diverse 2-alkyl-4(1H)-quinolones (AHQs), including the signaling molecule 2-heptyl-3-hydroxy-4(1H)-quinolone (PQS), via the pqsABCDE locus. By examining the genome databases, homologs of the pqs genes were identified in other bacteria. However, apart from P. aeruginosa, only Burkholderia pseudomallei and B. thailandensis contained a complete pqsA–E operon (termed hhqA–E). By introducing the B. pseudomallei hhqA and hhqE genes into P. aeruginosa pqsA and pqsE mutants, we show that they are functionally conserved and restore virulence factor and PQS production. B. pseudomallei, B. thailandensis, B. cenocepacia, and P. putida each produced 2-heptyl-4(1H)-quinolone (HHQ), but not PQS. Mutation of hhqA in B. pseudomallei resulted in the loss of AHQ production, altered colony morphology, and enhanced elastase production, which was reduced to parental levels by exogenous HHQ. These data reveal a role for AHQs in bacterial cell-to-cell communication beyond that seen in P. aeruginosa.