title: Synthesis and characterization of a d(ApG) platinated nonanucleotide duplex.
abstract: The nonamer 5'd(CTCAGCCTC) 3' 1 has been reacted with cis-diamminediaquaplatinum(II) in water at pH 4.2. The major reaction product was shown by enzymatic digestion and 1H NMR to be the d(ApG)cis-Pt(NH3)2 chelate [cis-Pt(NH3)2[d(CTCAGCCTC)-N7(4),N7(5)]] 1-Pt. When mixed with its complementary strand 2, 1-Pt forms a B DNA type duplex 3-Pt with a Tm of 35 degrees C (versus 58 degrees C for the unplatinated duplex). The NMR study of the exchangeable protons of 3-Pt revealed that the helix distortion is localized on the CA*G*-CTG moiety (the asterisks indicating the platinum chelation sites) with a strong perturbation of the A*(4)T(15) base pair related to a large tilt of A*(4).
authors.affiliation: Laboratoire de Chimie et Biochimie Pharmacologiques et Toxicologiques, URA 400 CNRS, Université René Descartes, Paris, France.
authors.forename: M H
authors.initials: MH
authors.lastname: Fouchet
authors.forename: C
authors.initials: C
authors.lastname: Gauthier
authors.forename: E
authors.initials: E
authors.lastname: Guittet
authors.forename: J P
authors.initials: JP
authors.lastname: Girault
authors.forename: J
authors.initials: J
authors.lastname: Igolen
authors.forename: J C
authors.initials: JC
authors.lastname: Chottard
mesh_terms: D001482:Base Composition; D001483:Base Sequence; D002945:Cisplatin / Q000737:chemistry*; D004247:DNA / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy / Q000379:methods; D008969:Molecular Sequence Data; D009838:Oligodeoxyribonucleotides / Q000138:chemical synthesis / Q000737:chemistry*; D009944:Organoplatinum Compounds / Q000138:chemical synthesis* / Q000737:chemistry; D013056:Spectrophotometry, Ultraviolet
chemical_list: D009838:Oligodeoxyribonucleotides; D009944:Organoplatinum Compounds; D004247:DNA; D002945:Cisplatin