Protein-Observed 19f Nmr Of Leca From Pseudomonas Aeruginosa

The carbohydrate-binding protein LecA (PA-IL) from Pseudomonas aeruginosa plays an important role in the formation of biofilms in chronic infections. Development of inhibitors to disrupt LecA-mediated biofilms is desired but it is limited to carbohydrate-based ligands. Moreover, discovery of drug-like ligands for LecA is challenging because of its weak affinities. Therefore, we established a protein-observed 19F (PrOF) nuclear magnetic resonance (NMR) to probe ligand binding to LecA. LecA was labeled with 5-fluoroindole to incorporate 5-fluorotryptophanes and the resonances were assigned by site-directed mutagenesis. This incorporation did not disrupt LecA preference for natural ligands, Ca2+ and D-galactose. (D-Gal).Following NMR perturbation of W42, which is located in the carbohydrate-binding region of LecA, allowed to monitor binding of low-affinity ligands such as N-acetyl D-galactosamine (D-GalNAc, K-d = 780 +/- 97 mu M). Moreover, PrOF NMR titration with glycomimetic of LecA p-nitrophenyl beta-D-galactoside (pNPGal, K-d = 54 +/- 6 mu M) demonstrated a 6-fold improved binding of D-Gal proving this approach to be valuable for ligand design in future drug discovery campaigns that aim to generate inhibitors of LecA.