title: Theoretical study about remarkable stability of guanine tetramer.
abstract: The cyclic guanine tetramer (G-quartet) formation was theoretically studied. Total hydrogen bond energy in a G-quartet was large (-70.89 kcal/mol). though the hydrogen bond energy in Hoogsteen type guanine dimer was small (-11.26 kcal/mol). A large attractive interaction (-57.84 kcal/mol) was observed for stacking interaction. The hydration effect should be considered to explain the selectivity of metal incorporation into the G-quartet.
authors.affiliation: National Food Research Institute, Biological Function Division, Molecular Function Laboratory, 2-1-12 Kannondai, Tsukuba, Ibaraki 305-8642, Japan.
authors.forename: Shun-ichi
authors.initials: S
authors.lastname: Kawahara
authors.forename: Yasuomi
authors.initials: Y
authors.lastname: Takagi
authors.forename: Kazunari
authors.initials: K
authors.lastname: Taira
authors.forename: Hideyuki
authors.initials: H
authors.lastname: Kobayashi
mesh_terms: D006147:Guanine / Q000737:chemistry*; D006860:Hydrogen Bonding; D008670:Metals / Q000737:chemistry; D008962:Models, Theoretical; D009690:Nucleic Acid Conformation; D013816:Thermodynamics
chemical_list: D008670:Metals; D006147:Guanine