title: Solid-state NMR spectroscopy method for determination of the backbone torsion angle psi in peptides with isolated uniformly labeled residues.
abstract: We demonstrate a solid-state nuclear magnetic resonance technique, with the acronym ROCSA-LG, for the determination of backbone torsion angles psi in peptides with multiple, but isolated, uniformly labeled residues. The method correlates the 13C' chemical shift anisotropy and the 13Calpha-1Halpha heteronuclear dipolar tensors within a single uniformly labeled residue in a two-dimensional (2D) experiment. The technique requires the measurement of only five 2D spectra and is compatible with high-speed magic-angle spinning. Experimental results are presented for the 17-residue alpha-helical peptide MB(i+4)EK and for amyloid fibrils formed by the 15-residue peptide Abeta11-25.
mesh_terms: D002247:Carbon Isotopes; D019906:Nuclear Magnetic Resonance, Biomolecular / Q000379:methods*; D010455:Peptides / Q000737:chemistry*; D017433:Protein Structure, Secondary
chemical_list: D002247:Carbon Isotopes; D010455:Peptides