title: Triplex forming ability of oligonucleotides containing 2'-O-methyl-2-thiouridine or 2-thiothymidine.
abstract: The triplex forming ability of oligonucleotides containing 2'-O-methyl-2-thiouridine (s2Um) and 2-thiothymidine (s2T) was studied. The UV melting experiments revealed that triplex forming oligonucleotides (TFOs) containing both s2Um or s2T stabilized significantly parallel triplexes. The main reason for stabilization of triplexes was due to the stacking effect of the 2-thiocarbonyl group. Moreover, it turned out that these modified TFOs had a high selectivity in recognition of a matched Hoogsteen base from a mismatched one.
authors.affiliation: Department of Life Science, Tokyo Institute of Technology, Japan.
authors.forename: Itaru
authors.initials: I
authors.lastname: Okamoto
authors.forename: Kohji
authors.initials: K
authors.lastname: Seio
authors.forename: Mitsuo
authors.initials: M
authors.lastname: Sekine
mesh_terms: D001483:Base Sequence; D009690:Nucleic Acid Conformation; D009841:Oligonucleotides / Q000138:chemical synthesis / Q000737:chemistry*; D013891:Thiouridine / Q000031:analogs & derivatives* / Q000737:chemistry; D013936:Thymidine / Q000031:analogs & derivatives* / Q000737:chemistry; D044366:Transition Temperature
chemical_list: C409967:2'-O-methyl-2-thiouridine; D009841:Oligonucleotides; D013891:Thiouridine; C060625:2-thiothymidine; D013936:Thymidine