title: Probing structure in invisible protein states with anisotropic NMR chemical shifts.
abstract: A general method for obtaining quantitative structural information on invisible, excited protein states by solution-based NMR spectroscopy is presented. The approach exploits relaxation dispersion techniques in which changes in chemical shifts between ground and excited states are monitored in solutions with and without small amounts of residual molecular alignment. This allows the calculation of differences in chemical shifts induced by alignment that can be directly related to molecular structure, in cases where the orientation and magnitude of the chemical-shift tensor are well defined. An example using carbonyl chemical shifts as probes of a protein-ligand binding reaction is presented to illustrate and validate the method.
authors.affiliation: Departments of Molecular Genetics, Biochemistry, and Chemistry, University of Toronto, Toronto, Ontario, Canada M5S 1A8.
authors.forename: Pramodh
authors.initials: P
authors.lastname: Vallurupalli
authors.forename: D Flemming
authors.initials: DF
authors.lastname: Hansen
authors.forename: Lewis E
authors.initials: LE
authors.lastname: Kay
mesh_terms: D016880:Anisotropy; D009682:Magnetic Resonance Spectroscopy / Q000379:methods* / Q000592:standards*; D008280:Magnetics; D011487:Protein Conformation; D011506:Proteins / Q000737:chemistry*; D012015:Reference Standards; D012680:Sensitivity and Specificity
chemical_list: D011506:Proteins