title: Formation of nucleosomes does not suppress interaction of a DNA fragment with an alkylating derivative of a pyrimidine oligonucleotide.
abstract: Oligonucleotide derivatives capable of binding to specific nucleic acids are considered as potential therapeutic agents, exerting their action at the level of genome functioning (Hélène, 1991; Knorre et al., 1993). A straightforward approach to targeting DNA is based on using oligonucleotides capable of binding to oligopurine-oligopyrimidine sequences by formation of triple-strand structures. We report results of experiments on sequence-specific chemical modification of a 490-bp fragment of pfosCAT plasmid, containing the promoter segment of the c-fos gene using 4-(N-2-chloroethyl-N-methylamino)-benzylphosphamide derivatives of a homopyrimidine 14-mer oligonucleotide. It was shown that in both the free DNA and the DNA involved in nucleosome structure, reaction occurred with similar efficiency at the target guanosine residue G404.
authors.affiliation: Novosibirsk Institute of Bioorganic Chemistry, Siberian Division of Russion Academy of Sciences.
authors.forename: M V
authors.initials: MV
authors.lastname: Makel'Skaya
authors.forename: O A
authors.initials: OA
authors.lastname: Koval
authors.forename: N D
authors.initials: ND
authors.lastname: Kobets
authors.forename: V V
authors.initials: VV
authors.lastname: Vlassov
mesh_terms: D000478:Alkylation; D001483:Base Sequence; D001665:Binding Sites; D004247:DNA / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism*; D005260:Female; D016762:Genes, fos; D006801:Humans; D066298:In Vitro Techniques; D009690:Nucleic Acid Conformation; D009707:Nucleosomes / Q000378:metabolism*; D009838:Oligodeoxyribonucleotides / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism*; D010920:Placenta / Q000378:metabolism; D010957:Plasmids / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D011247:Pregnancy; D011401:Promoter Regions, Genetic
chemical_list: D009707:Nucleosomes; D009838:Oligodeoxyribonucleotides; D004247:DNA