Two Distinct Pathways Supply Anthranilate as a Precursor of the Pseudomonas Quinolone Signal
Farrow, John M. III; Pesci, Everett
Pseudomonas aeruginosa is an opportunistic pathogen that causes serious infections in immunocompromised patients and those with cystic fibrosis (CF). This gram-negative bacterium uses multiple cell-to-cell signals to control numerous cellular functions and virulence. One of these signals is 2-heptyl-3-hydroxy-4-quinolone, which is referred to as the Pseudomonas quinolone signal (PQS). This signal functions as a coinducer for a transcriptional regulator (PqsR) to positively control multiple virulence genes and its own synthesis. PQS production is required for virulence in multiple models of infection, and it has been shown to be produced in the lungs of CF patients infected by P. aeruginosa. One of the precursor compounds from which PQS is synthesized is the metabolite anthranilate. This compound can be derived from the conversion of chorismate to anthranilate by an anthranilate synthase or through the degradation of tryptophan via the anthranilate branch of the kynurenine pathway. In this study, we present data which help to define the kynurenine pathway in P. aeruginosa and show that the kynurenine pathway serves as a critical source of anthranilate for PQS synthesis. We also show that the kyn pathway genes are induced during growth with tryptophan and that they are autoregulated by kynurenine. This study provides solid foundations for the understanding of how P. aeruginosa produces the anthranilate that serves as a precursor to PQS and other 4-quinolones. Originally published Journal of Bacteriology Vol. 189, No. 9.
Farrow, John M. III, & Pesci, Everett. (May 2007). Two Distinct Pathways Supply Anthranilate as a Precursor of the Pseudomonas Quinolone Signal. Journal of Bacteriology, 189(9), 3425- 3433. Retrieved from http://hdl.handle.net/10342/2972
Farrow, John M. III, and Pesci, Everett. "Two Distinct Pathways Supply Anthranilate as a Precursor of the Pseudomonas Quinolone Signal". Journal of Bacteriology. 189:9. (3425-3433), May 2007. November 12, 2018. http://hdl.handle.net/10342/2972.
Farrow, John M. III and Pesci, Everett, "Two Distinct Pathways Supply Anthranilate as a Precursor of the Pseudomonas Quinolone Signal," Journal of Bacteriology 189, no. 9 (May 2007), http://hdl.handle.net/10342/2972 (accessed November 12, 2018).
Farrow, John M. III, Pesci, Everett. Two Distinct Pathways Supply Anthranilate as a Precursor of the Pseudomonas Quinolone Signal. Journal of Bacteriology. May 2007; 189(9): 3425-3433. http://hdl.handle.net/10342/2972. Accessed November 12, 2018.
East Carolina University