title: 4'-Thio-RNA: synthesis of mixed base 4'-thio-oligoribonucleotides, nuclease resistance, and base pairing properties with complementary single and double strand.
abstract: 4'-Thio-beta-D-oligoribonucleotides (12 mer and 16 mer) containing a mixed base sequence were synthesized via the phosphoramidite solid support approach. These RNA analogs showed very good nuclease resistance as compared with wild-type RNA. Furthermore, 4'-thio-beta-D-oligoribonucleotides were shown to hybridize with a complementary DNA or RNA strand to form a duplex or with a DNA hairpin to form a triple helix. 4'-Thio-RNA binds more tightly to its complementary RNA strand than to its complementary DNA strand. A 4'-thio-RNA:RNA duplex is as stable as a 2'-O-methyl-RNA:RNA duplex. 4'-Thio-RNA, however, forms a 4'-thio-RNA:DNA:DNA triplex with a stability similar to the corresponding triplex with all wild-type DNA.
authors.affiliation: Laboratoire de Chimie Bio-Organique, URA 488, CNRS, Université de Montpellier II, France.
authors.forename: C
authors.initials: C
authors.lastname: Leydier
authors.forename: L
authors.initials: L
authors.lastname: Bellon
authors.forename: J L
authors.initials: JL
authors.lastname: Barascut
authors.forename: F
authors.initials: F
authors.lastname: Morvan
authors.forename: B
authors.initials: B
authors.lastname: Rayner
authors.forename: J L
authors.initials: JL
authors.lastname: Imbach
mesh_terms: D000577:Amides; D001482:Base Composition; D001483:Base Sequence; D004247:DNA / Q000737:chemistry; D007202:Indicators and Reagents; D009682:Magnetic Resonance Spectroscopy; D008969:Molecular Sequence Data; D009690:Nucleic Acid Conformation; D009691:Nucleic Acid Denaturation; D009693:Nucleic Acid Hybridization; D009838:Oligodeoxyribonucleotides / Q000138:chemical synthesis / Q000737:chemistry* / Q000378:metabolism; D016376:Oligonucleotides, Antisense / Q000138:chemical synthesis / Q000737:chemistry* / Q000378:metabolism; D009843:Oligoribonucleotides / Q000138:chemical synthesis / Q000737:chemistry* / Q000378:metabolism; D010756:Phosphoric Acids; D012313:RNA / Q000737:chemistry; D013873:Thionucleotides
chemical_list: D000577:Amides; D007202:Indicators and Reagents; D009838:Oligodeoxyribonucleotides; D016376:Oligonucleotides, Antisense; D009843:Oligoribonucleotides; D010756:Phosphoric Acids; D013873:Thionucleotides; D012313:RNA; D004247:DNA; C011067:phosphoramidic acid