Backbone ¹H, ¹³C and ¹⁵N assignments of the apo-acyl carrier protein (ACP₁) of Pseudomonas aeruginosa

The N-acyl-L-homoserine lactone (AHL) quorum sensing regulates virulence in the opportunistic pathogen, Pseudomonas aeruginosa. The LasI and RhlI AHL synthases use acyl carrier protein substrates to synthesize, respectively, the 3-oxododecanoyl-L-homoserine lactone (3-oxoC12-HSL) and butyryl-L-homoserine lactone (C4-HSL) QS signals for this bacterium. Although P. aeruginosa genome contains three open reading frames to encode three acyl carrier proteins, namely the ACP₁, ACP₂ and ACP₃, microarray and gene replacement studies show that only the ACP₁ carrier protein is under quorum sensing regulation. In this study, we isotopically enriched one of the acyl carrier proteins, ACP₁ from P. aeruginosa and describe the backbone resonance assignments for this protein to delineate the structural and molecular basis of ACP₁ recognition in P. aeruginosa AHL quorum sensing signal synthesis.