The end of an old hypothesis: the pseudomonas signaling molecules 4-hydroxy-2-alkylquinolines derive from fatty acids, not 3-ketofatty acids.

Carlos Eduardo Dulcey 1 Valérie Dekimpe 1 David-Alexandre Fauvelle 1 Sylvain Milot 1 Marie-Christine Groleau 1 Nicolas Doucet 1 Laurence G Rahme 2 François Lépine 1, * Eric Déziel 1, *
* Corresponding author
1 INRS-IAF - Institut Armand Frappier
2 Department of Surgery
Abstract : Groups of pathogenic bacteria use diffusible signals to regulate their virulence in a concerted manner. Pseudomonas aeruginosa uses 4-hydroxy-2-alkylquinolines (HAQs), including 4-hydroxy-2-heptylquinoline (HHQ) and 3,4-dihydroxy-2-heptylquinoline (PQS), as unique signals. We demonstrate that octanoic acid is directly incorporated into HHQ. This finding rules out the long-standing hypothesis that 3-ketofatty acids are the precursors of HAQs. We found that HAQ biosynthesis, which requires the PqsABCD enzymes, proceeds by a two-step pathway: (1) PqsD mediates the synthesis of 2-aminobenzoylacetate (2-ABA) from anthraniloyl-coenzyme A (CoA) and malonyl-CoA, then (2) the decarboxylating coupling of 2-ABA to an octanoate group linked to PqsC produces HHQ, the direct precursor of PQS. PqsB is tightly associated with PqsC and required for the second step. This finding uncovers promising targets for the development of specific antivirulence drugs to combat this opportunistic pathogen.
Document type :
Journal articles
Complete list of metadatas
https://hal-riip.archives-ouvertes.fr/pasteur-01130934
Contributor : Michel Courcelles <>
Submitted on : Thursday, March 12, 2015 - 3:32:31 PM
Last modification on : Tuesday, August 6, 2019 - 11:30:43 AM

Links full text

pubmedcentral

Identifiers

Collections

RIIP | INRS-IAF

Citation

Carlos Eduardo Dulcey, Valérie Dekimpe, David-Alexandre Fauvelle, Sylvain Milot, Marie-Christine Groleau, et al.. The end of an old hypothesis: the pseudomonas signaling molecules 4-hydroxy-2-alkylquinolines derive from fatty acids, not 3-ketofatty acids.. Chemistry & biology, 2013, 20 (12), pp.1481-91. ⟨10.1016/j.chembiol.2013.09.021⟩. ⟨pasteur-01130934⟩

Export

BibTeX TEI DC DCterms EndNote

Share

Metrics

Record views

80

Contact

CCSD