5oe5
From Proteopedia
Crystal structure of the N-terminal domain of PqsA in complex with anthraniloyl-AMP (crystal form 3)
Structural highlights
FunctionPQSA_PSEAE Catalyzes the formation of anthraniloyl-CoA, which is the priming step for entry into the Pseudomonas quinolone signal (PQS) biosynthetic pathway. Also active on a variety of aromatic substrates, including benzoate and chloro and fluoro derivatives of anthranilate.[1] [2] Publication Abstract from PubMedPseudomonas aeruginosa, a prevalent pathogen in nosocomial infections and a major burden in cystic fibrosis, uses three interconnected quorum-sensing systems to coordinate virulence processes. At variance with other Gram-negatives, one of these systems relies on alkylquinolones (Pseudomonas Quinolone Signal, PQS) and may hence be an attractive target for new anti-infectives. Here, we report crystal structures of the N-terminal domain of anthranilate-CoA ligase PqsA, the first enzyme of PQS biosynthesis, in complex with anthraniloyl-AMP and 6-fluoroanthraniloyl-AMP (6FABA-AMP) at 1.4 and 1.7 A resolution. We find that PqsA belongs to an unrecognized subfamily of anthranilate-CoA ligases that recognizes the amino group of anthranilate through a water-mediated hydrogen bond. The complex with 6FABA-AMP explains why 6FABA, an inhibitor of PQS biosynthesis, is a good substrate of PqsA. Together, our data may pave a way to new pathoblockers in P. aeruginosa infections. Structures of the N-terminal domain of PqsA in complex with anthraniloyl- and 6-fluoroanthraniloyl-AMP: substrate activation in Pseudomonas Quinolone Signal (PQS) biosynthesis.,Witzgall F, Ewert W, Blankenfeldt W Chembiochem. 2017 Aug 18. doi: 10.1002/cbic.201700374. PMID:28834007[3] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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