title: Assignment and NOE analysis of 2'-hydroxyl protons in RNA: implications for stabilization of RNA A-form duplexes.
abstract: The ribose 2'-OH hydroxyl group distinguishes RNA from DNA. The 2'-OH hydroxyl protons are responsible for differences in conformation, hydration, and thermodynamic stability of RNA and DNA oligonucleotides. Additionally, the 2'-OH group plays a central role in RNA catalysis. This important group lies in the shallow groove of RNA, where it is involved in a network of hydrogen bonds with water molecules stabilizing RNA A-form duplexes. Structural and dynamical information on 2'-OH hydroxyl protons is essential to understand their respective roles. Here we report the 2'-OH hydroxyl proton assignments for a 30mer RNA, the HIV-2 transactivation region, in water using solution NMR techniques. We provide structural information on 2'-OH hydroxyl groups in the form of orientational preferences contradicting the paradigm that the 2'-OH hydroxyl typically points away from the ribose H1' proton.
authors.affiliation: Department of Molecular Biology, The Scripps Research Institute, MB33, 10550 North Torrey Pines Road, La Jolla, California 92037, USA. mirko@scripps.edu
authors.forename: Mirko
authors.initials: M
authors.lastname: Hennig
authors.forename: Jörg
authors.initials: J
authors.lastname: Fohrer
authors.forename: Teresa
authors.initials: T
authors.lastname: Carlomagno
mesh_terms: D016325:HIV Long Terminal Repeat / Q000235:genetics*; D015498:HIV-2 / Q000235:genetics*; D008958:Models, Molecular; D019906:Nuclear Magnetic Resonance, Biomolecular / Q000379:methods; D009690:Nucleic Acid Conformation; D012313:RNA / Q000737:chemistry*; D012367:RNA, Viral / Q000737:chemistry*
chemical_list: D012367:RNA, Viral; D012313:RNA