title: Reaction of (1R,2S,3S)-3-methylcyclohexanediamineplatinum(II) with DNA: isolation and characterization of the platinum-nucleotide adducts by means of HPLC and NMR spectroscopy.
abstract: Reaction products of calf thymus DNA with (1R,2S,3S)-3-methylcyclohexanediamineplatinum (abbreviated as Pt(RSS-dach)Cl2) were investigated by enzymatic degradation of the platinated DNA and subsequent HPLC analysis. Five platinated adducts involving d(GpG), d(ApG) and (dG)2 residues were identified by HPLC after complete digestion using deoxyribonuclease I, nuclease P1, and alkaline phosphatase. The adducts with d(GpG) and d(ApG) consisted of two geometrical isomers, because Pt(RSS-dach)Cl2 lacks a C2 symmetry element. The d(GpG) and d(ApG) adducts were intrastrand compounds crosslinked between the N7 atoms of the adjacent purine bases. The two d(GpG) adducts were most abundant and comprised more than 65% of all the platinated adducts. The relative ratio of the two d(GpG) isomers was 3:2 for reaction with DNA, whereas the ratio was 1:1 for reaction with a single stranded oligonucleotide. The detailed structure of the two d(GpG) adducts is also described based on NMR spectroscopic data.
authors.affiliation: Laboratory of Chemistry, Seirei Christopher College of Nursing, Hamamatsu, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Inagaki
authors.forename: K
authors.initials: K
authors.lastname: Sawaki
mesh_terms: D000469:Alkaline Phosphatase / Q000737:chemistry; D000818:Animals; D002851:Chromatography, High Pressure Liquid; D002945:Cisplatin / Q000031:analogs & derivatives* / Q000737:chemistry; D004247:DNA / Q000737:chemistry* / Q000378:metabolism; D018736:DNA Adducts / Q000737:chemistry / Q000302:isolation & purification*; D003850:Deoxyribonuclease I / Q000737:chemistry; D009682:Magnetic Resonance Spectroscopy; D009944:Organoplatinum Compounds / Q000737:chemistry*; D015719:Single-Strand Specific DNA and RNA Endonucleases / Q000737:chemistry; D013237:Stereoisomerism; D013950:Thymus Gland / Q000378:metabolism
chemical_list: C093308:3-methylcyclohexanediamineplatinum; D018736:DNA Adducts; D009944:Organoplatinum Compounds; D004247:DNA; D003850:Deoxyribonuclease I; D000469:Alkaline Phosphatase; D015719:Single-Strand Specific DNA and RNA Endonucleases; D002945:Cisplatin