Involved in the degradation of the Pseudomonas aeruginosa quorum sensing signal molecules HHQ (2-heptyl-4-quinolone) and PQS (2-heptyl-3-hydroxy-4-quinolone) to anthranilic acid. Catalyzes the cleavage of PQS to form N-octanoylanthranilic acid and carbon monoxide. 2-heptyl-3-hydroxy-4(1H)-quinolone + O2 = CO + H(+) + N-octanoylanthranilate kcat is 20.5 sec(-1). Up-regulated by PQS. Belongs to the AB hydrolase superfamily.