title: Protein-ligand interactions measured by 15N-filtered diffusion experiments.
abstract: NMR diffusion coefficient measurements have been shown to be sensitive to the conformational and oligomeric states of proteins. Recently, heteronuclear-filtered diffusion experiments have been proposed [Dingley et al. (1997) J. Biomol. NMR, 10, 1-8]. Several new heteronuclear-filtered diffusion pulse sequences are proposed which are shown to have superior sensitivity to those previously proposed. One of these new heteronuclear-filtered diffusion experiments has been used to study the binding of an SH3 domain to a peptide. Using this system, we show that it is possible to measure binding constants from diffusion coefficient measurements.
mesh_terms: D004058:Diffusion; D008024:Ligands; D026901:Membrane Transport Proteins; D009252:NADPH Dehydrogenase / Q000737:chemistry; D019255:NADPH Oxidases; D019906:Nuclear Magnetic Resonance, Biomolecular / Q000379:methods; D010446:Peptide Fragments / Q000737:chemistry; D010455:Peptides / Q000737:chemistry; D010750:Phosphoproteins / Q000737:chemistry; D011506:Proteins / Q000737:chemistry*; D012680:Sensitivity and Specificity; D018909:src Homology Domains