title: The binding of an antisense oligonucleotide to a hairpin structure via triplex formation inhibits chemical and biological reactions.
abstract: We have investigated the binding of a 26-mer antisense oligodeoxynucleotide to a 69-mer DNA hairpin with a 13 base pair stem, bearing an Rsa1 restriction site. The 5' part of the 26-mer annealed to a stretch of six purines at the bottom of the hairpin. The 3' part was designed to fold back to form a triplex with both the stem of the hairpin and with the sequence paired to its own 5' region. Using non-denaturing polyacrylamide gel electrophoresis, melting curves (Tm) and chemical footprinting, we were able to show the formation of a 'double-hairpin' complex between the 69-mer and the 26-mer antisense oligopyrimidines. The association was both sequence and pH-dependent. The formation of a double hairpin complex was shown to prevent the alkylation of the 69-mer DNA target by an oligonucleotide-nitrogen mustard conjugate and to selectively inhibit the action of Rsa1.
authors.affiliation: Laboratoire de Biophysique Moléculaire, INSERM CJF 90-13, Université de Bordeaux II, France.
authors.forename: E
authors.initials: E
authors.lastname: Brossalina
authors.forename: E
authors.initials: E
authors.lastname: Pascolo
authors.forename: J J
authors.initials: JJ
authors.lastname: Toulmé
mesh_terms: D000477:Alkylating Agents / Q000494:pharmacology; D001483:Base Sequence; D002851:Chromatography, High Pressure Liquid; D004247:DNA / Q000737:chemistry / Q000378:metabolism*; D004591:Electrophoresis, Polyacrylamide Gel; D006863:Hydrogen-Ion Concentration; D008969:Molecular Sequence Data; D009690:Nucleic Acid Conformation; D016376:Oligonucleotides, Antisense / Q000378:metabolism*; D011743:Pyrimidines / Q000378:metabolism; D013696:Temperature
chemical_list: D000477:Alkylating Agents; D016376:Oligonucleotides, Antisense; D011743:Pyrimidines; D004247:DNA; C030986:pyrimidine