5.4.99.18 drug development the enzyme in the de novo purine biosynthesis pathway is an attractive target for antibacterial drug design. Zenobia fragment library screening by saturation transfer difference nucleus magnetic resonance (STD-NMR), water-ligand observed via gradient spectroscopy (WaterLOGSY) NMR, and surface plasmon resonance (SPR) methods, method optimization, overview. The selected compouds are categorized into five different basic scaffolds, and at least two fragments from two different scaffolds exhibit inhibitory activity against the BaPurE enzyme 747257