title: Saturation transfer difference nuclear magnetic resonance study on the specific binding of ligand to protein.
abstract: Ligand-based nuclear magnetic resonance (NMR) approaches have shown great promise in the study of ligand-protein interaction. But these approaches suffer from interference from the nonspecific binding. Here a saturation transfer difference (STD) NMR method to map the group epitope and to measure the dissociation constant (K(D)) of specific interaction between ligand and protein is presented. The interference from nonspecific binding was corrected by recording STD NMR spectra of ligand-protein solutions with and without inhibitor saturating the mutually specific binding site and subtracting one from the other. The method was examined with L-tryptophan (Trp), naproxen (Nap), and human serum albumin (HSA) as model ligand, inhibitor, and protein, respectively. Results agree well with other reports of Trp-HSA interaction.
authors.affiliation: Wuhan Center for Magnetic Resonance, State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan, Hubei, PR China. zsji@wipm.ac.cn
authors.forename: Zhusheng
authors.initials: Z
authors.lastname: Ji
authors.forename: Zhongxiu
authors.initials: Z
authors.lastname: Yao
authors.forename: Maili
authors.initials: M
authors.lastname: Liu
mesh_terms: D001665:Binding Sites; D006801:Humans; D008024:Ligands; D008722:Methods; D009288:Naproxen / Q000737:chemistry; D019906:Nuclear Magnetic Resonance, Biomolecular / Q000379:methods*; D011485:Protein Binding; D011506:Proteins / Q000378:metabolism*; D012107:Research Design; D012709:Serum Albumin / Q000378:metabolism; D014364:Tryptophan / Q000378:metabolism
chemical_list: D008024:Ligands; D011506:Proteins; D012709:Serum Albumin; D009288:Naproxen; D014364:Tryptophan