title: Duplex to quadruplex equilibrium of the self-complementary oligonucleotide d(GGGGCCCC).
abstract: The structure of the deoxyoligonucleotide d(GGGGCCCC) has been monitored by 1H and 31P NMR, and by gel electrophoresis. In low-salt solution, this oligonucleotide forms a stable duplex structure. Upon titration with KCl, an equilibrium is established between duplex and quadruplex forms. The quadruplex form is the dominant one at physiological KCl concentrations, despite the fact that fewer hydrogen bonds are formed per strand in the quadruplex than in the duplex.
authors.affiliation: Department of Chemistry, University of Nebraska, Lincoln 68588, USA.
authors.forename: H
authors.initials: H
authors.lastname: Deng
authors.forename: W H
authors.initials: WH
authors.lastname: Braunlin
mesh_terms: D001483:Base Sequence; D003596:Cytosine; D004591:Electrophoresis, Polyacrylamide Gel / Q000379:methods; D006147:Guanine; D006859:Hydrogen; D006860:Hydrogen Bonding; D007700:Kinetics; D009682:Magnetic Resonance Spectroscopy / Q000379:methods; D008961:Models, Structural; D008969:Molecular Sequence Data; D009690:Nucleic Acid Conformation; D009838:Oligodeoxyribonucleotides / Q000138:chemical synthesis / Q000737:chemistry* / Q000302:isolation & purification; D010758:Phosphorus
chemical_list: D009838:Oligodeoxyribonucleotides; D010758:Phosphorus; D006147:Guanine; D006859:Hydrogen; D003596:Cytosine