title: 3D 13C-15N-heteronuclear two-spin coherence spectroscopy for polypeptide backbone assignments in 13C-15N-double-labeled proteins.
abstract: The pulse sequence of a new constant-time 3D triple-resonance experiment, ct-HA[CAN]HN, is presented. This experiment delineates exclusively scalar connectivities and uses 13C alpha-15N heteronuclear two-spin coherence to overlay the chemical shift evolution periods of the 13C alpha and 15N nuclei, thereby providing the four resonance frequencies of the alpha-proton, the alpha-carbon, the amide nitrogen, and the amide proton of a given amino acid residue in three dimensions. This experiment promises to be a valid alternative to 4D experiments, providing the same information on intraresidue polypeptide backbone connectivities in 13C-15N-double-labeled proteins.
authors.affiliation: Institut für Molekularbiologie und Biophysik, Eidgenössische Technische Hochschule-Hönggerberg, Zürich, Switzerland.
authors.forename: T
authors.initials: T
authors.lastname: Szyperski
authors.forename: G
authors.initials: G
authors.lastname: Wider
authors.forename: J H
authors.initials: JH
authors.lastname: Bushweller
authors.forename: K
authors.initials: K
authors.lastname: Wüthrich
mesh_terms: D002247:Carbon Isotopes; D009682:Magnetic Resonance Spectroscopy / Q000379:methods; D008433:Mathematics; D008962:Models, Theoretical; D009587:Nitrogen Isotopes; D011487:Protein Conformation; D011506:Proteins / Q000737:chemistry*
chemical_list: D002247:Carbon Isotopes; D009587:Nitrogen Isotopes; D011506:Proteins