title: [Nitrogen mustard fixes the Z-conformation in poly[d(G-C)]poly[d(G-C)] and DNA].
abstract: The reactions of poly(dG-dC).poly(dG-dC) and (dG-dC)10 insert in the plasmid pGC20 with N-methyl-bis(2-chloroethyl)-amine (nitrogen mustard, HN-2) have been studied. It is shown that nitrogen mustard does not induce the B----Z transition in poly(dG-dC).poly(dG-dC), but produces fixation of the polynucleotide Z-conformation once this exists. In the case of pGC20 plasmid DNA, nitrogen mustard also fixes Z-form of the (dG-dC)-insert. The rate constant of the reaction of nitrogen mustard with guanine in the polynucleotide (k = 9,0.10(-3) min-1) is about one-third of that for the fixation of Z-form of the (dG-dC)-insert in the plasmid (k1 = 2,8.10(-2) min-1) which is attributed to a greater rate of formation of diguanyl derivative in the opposite DNA chains. It is suggested that nitrogen mustard is capable of fixing the Z-form DNA not only in vitro, but also in vivo.
authors.forename: B P
authors.initials: BP
authors.lastname: Ulanov
authors.forename: T I
authors.initials: TI
authors.lastname: Matorina
authors.forename: P P
authors.initials: PP
authors.lastname: Pozdeev
mesh_terms: D002942:Circular Dichroism; D004247:DNA / Q000737:chemistry*; D004591:Electrophoresis, Polyacrylamide Gel; D007700:Kinetics; D008466:Mechlorethamine / Q000737:chemistry*; D009690:Nucleic Acid Conformation; D011089:Polydeoxyribonucleotides / Q000737:chemistry*
chemical_list: D011089:Polydeoxyribonucleotides; C019530:poly(dC-dG); D008466:Mechlorethamine; D004247:DNA
vernacular_title: Embikhin fiksiruet Z-formu v poli[d(G-C)]poli[d)G-C)] i DNK.