title: Determination of sugar conformation in large RNA oligonucleotides from analysis of dipole-dipole cross correlated relaxation by solution NMR spectroscopy.
abstract: A new experiment, the forward directed quantitative gamma-HCCH-TOCSY for the measurement of the conformation of the five-membered ribosyl unit in RNA oligonucleotides, is presented. The experiment relies on quantification of cross peak intensities caused by evolution of CH, CH-dipole-dipole cross correlated relaxation in non-evolution periods and the resolution enhancement obtainable in forward directed HCC-TOCSY transfer. Cross correlated relaxation rates are interpreted to reveal the sugar conformation of 22 out of 25 nucleotides in an isotopically labelled 25-mer RNA. The results obtained with this new method are in agreement with the conformational analysis derived from 3J(H,H) coupling constants.
authors.affiliation: Institut für Organische Chemie, Johann-Wolfgang-Goethe-Universität Frankfurt, Germany.
authors.forename: C
authors.initials: C
authors.lastname: Richter
authors.forename: C
authors.initials: C
authors.lastname: Griesinger
authors.forename: I
authors.initials: I
authors.lastname: Felli
authors.forename: P T
authors.initials: PT
authors.lastname: Cole
authors.forename: G
authors.initials: G
authors.lastname: Varani
authors.forename: H
authors.initials: H
authors.lastname: Schwalbe
mesh_terms: D002236:Carbohydrate Conformation; D008962:Models, Theoretical; D019906:Nuclear Magnetic Resonance, Biomolecular / Q000295:instrumentation / Q000379:methods*; D009690:Nucleic Acid Conformation; D009843:Oligoribonucleotides / Q000737:chemistry*; D012996:Solutions
chemical_list: D009843:Oligoribonucleotides; D012996:Solutions