title: Domain orientation in beta-cyclodextrin-loaded maltose binding protein: diffusion anisotropy measurements confirm the results of a dipolar coupling study.
abstract: Maltose binding protein (MBP) is a 370-residue two-domain molecule involved in bacterial chemotaxis and sugar uptake. Rotational diffusion tensors were calculated for a complex between MBP and beta-cyclodextrin using backbone 15N T1 and T1rho relaxation times and steady state 1H-15N NOE values. The tensors obtained for each of the two domains in the protein were subsequently used to determine the relative domain orientation in the molecule. The average domain orientation determined using this approach agrees well with results from dipolar coupling data, but differs significantly from the domain orientation deduced from X-ray studies of the complex.
authors: Protein Engineering Network Center of Excellence and Department of Medical Genetics, Biochemistry and Chemistry, University of Toronto, ON, Canada.
authors: P M
authors: PM
authors: Hwang
authors: N R
authors: NR
authors: Skrynnikov
authors: L E
authors: LE
authors: Kay
mesh_terms: D018528:ATP-Binding Cassette Transporters; D016880:Anisotropy; D002352:Carrier Proteins / Q000737:chemistry*; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D003505:Cyclodextrins / Q000737:chemistry*; D004058:Diffusion; D004926:Escherichia coli / Q000737:chemistry; D029968:Escherichia coli Proteins; D046911:Macromolecular Substances; D058619:Maltose-Binding Proteins; D008958:Models, Molecular; D009004:Monosaccharide Transport Proteins; D019906:Nuclear Magnetic Resonance, Biomolecular / Q000379:methods*; D011485:Protein Binding; D011487:Protein Conformation; D017434:Protein Structure, Tertiary; D012399:Rotation; D047392:beta-Cyclodextrins
chemical_list: D018528:ATP-Binding Cassette Transporters; D002352:Carrier Proteins; D003505:Cyclodextrins; D029968:Escherichia coli Proteins; D046911:Macromolecular Substances; D058619:Maltose-Binding Proteins; D009004:Monosaccharide Transport Proteins; D047392:beta-Cyclodextrins; C461599:maltose transport system, E coli; C031215:betadex