title: [Sequence-specific interaction of pyrimidine oligonucleotides with double-stranded DNA at acidic pH complexes of different types].
abstract: The interaction of pyrimidine oligonucleotides (OLN(15) and OLN(6)) and their alkylating derivatives bearing 4-(3-amino)-N-methyl and N-2-chloroethyl (RCl) aniline residues at the 5'-phosphate with a fragment of the human gamma-interferon gene was studied. In the presence of 150 mM NaCl at pH 5.4, the yield of dsDNA alkylation was 60% for RCl-OLN(15) and 10% for RCl-OLN(6); at pH 4.0 in the presence of 150 mM NaCl and 10 mM MgCl2, the yield of the dsDNA modification product was 100% for RCl-OLN(6) and 50% for RCl-OLN(15). It was shown by native electrophoresis that OLN(15) could form with the target dsDNA complexes of two types in the presence of magnesium ions at pH 4.0. One of the complexes was stable at pH 5.4 in the presence of magnesium ions, whereas the other was not. We found that only the complex stable in 10 mM Mg(OAc)2, pH 5.4, was effectively alkylated.
authors.affiliation: Institute of Clinical Immunology, Russian Academy of Medical Sciences, Novisibirsk, Russia.
authors.forename: E B
authors.initials: EB
authors.lastname: Brossalina
authors.forename: E N
authors.initials: EN
authors.lastname: Demchenko
authors.forename: Iu N
authors.initials: IuN
authors.lastname: Demchenko
authors.forename: V V
authors.initials: VV
authors.lastname: Vlassov
mesh_terms: D004247:DNA / Q000737:chemistry*; D006801:Humans; D006863:Hydrogen-Ion Concentration; D015636:Magnesium Chloride / Q000737:chemistry; D009841:Oligonucleotides / Q000737:chemistry*; D011743:Pyrimidines / Q000737:chemistry*; D012965:Sodium Chloride / Q000737:chemistry
chemical_list: D009841:Oligonucleotides; D011743:Pyrimidines; D015636:Magnesium Chloride; D012965:Sodium Chloride; D004247:DNA; C030986:pyrimidine