title: Formation of stable triplexes between purine RNA and pyrimidine oligodeoxyxylonucleotides.
abstract: Hybridization properties of oligodeoxyxylonucleotides (OXNs) built from pyrimidine monomers with an inverted 3'-OH group of the furanose have been studied using the gel mobility shift, UV melting and circular dichroism (CD) spectroscopy methods. Pyrimidine OXNs form triple helices with complementary purine RNA in which one OXN is parallel and another is antiparallel with respect to the RNA target. Surprisingly, no duplex formation between the pyrimidine OXNs and purine RNAs is detected. The modified triplexes are stable at pH 7. Their thermal stability depends on the number of C(G-C) triplets and, for G-rich RNA sequences, it is comparable with the stability of native DNA-RNA duplexes. The CD spectra of triplexes formed by OXNs with purine RNA targets are similar to spectra of A-type helices. A pyrimidine OXN having a clamp structure efficiently inhibits reverse transcription of murine pim-1 mRNA in vitro mediated by the Mo-MuLV reverse transcriptase.
authors.affiliation: Belozersky Institute of Physico-Chemical Biology and Department of Chemistry, Moscow State University, Moscow 119899, Russia.
authors.forename: Sergei
authors.initials: S
authors.lastname: Ivanov
authors.forename: Yakov
authors.initials: Y
authors.lastname: Alekseev
authors.forename: Jean-Remi
authors.initials: JR
authors.lastname: Bertrand
authors.forename: Claude
authors.initials: C
authors.lastname: Malvy
authors.forename: Marina B
authors.initials: MB
authors.lastname: Gottikh
mesh_terms: D000818:Animals; D001483:Base Sequence; D002942:Circular Dichroism; D004247:DNA / Q000737:chemistry* / Q000235:genetics; D006863:Hydrogen-Ion Concentration; D051379:Mice; D009690:Nucleic Acid Conformation; D009691:Nucleic Acid Denaturation; D009838:Oligodeoxyribonucleotides / Q000737:chemistry* / Q000235:genetics; D017346:Protein Serine-Threonine Kinases / Q000235:genetics; D011518:Proto-Oncogene Proteins / Q000235:genetics; D051573:Proto-Oncogene Proteins c-pim-1; D011687:Purines / Q000737:chemistry; D011743:Pyrimidines / Q000737:chemistry; D012313:RNA / Q000737:chemistry* / Q000235:genetics; D012333:RNA, Messenger / Q000737:chemistry / Q000235:genetics; D013696:Temperature; D014158:Transcription, Genetic; D014994:Xylose / Q000737:chemistry
chemical_list: D009838:Oligodeoxyribonucleotides; D011518:Proto-Oncogene Proteins; D011687:Purines; D011743:Pyrimidines; D012333:RNA, Messenger; C051802:triplex DNA; D012313:RNA; D004247:DNA; D014994:Xylose; C496636:Pim1 protein, mouse; D017346:Protein Serine-Threonine Kinases; D051573:Proto-Oncogene Proteins c-pim-1; C030986:pyrimidine; C030985:purine