Genomic research on target identification and validation has created a great need for methods that rapidly provide detailed structural information on protein-ligand interactions. We developed a suite of NMR experiments as rapid and efficient tools to provide descriptive structural information on protein-ligand complexes. The methods work with large proteins and in particular cases also without the need for a complete three-dimensional structure. We will show applications with two tetrameric enzymes of 120 and 170 kDa.