title: DNA interactions of a functionalized ruthenium(II) mixed-polypyridyl complex [Ru(bpy)2ppd]2+.
abstract: A novel polypyridyl ligand pteridino[7,6-f][1,10]phenanthroline-1,13(10H,12H)-dione (ppd) and its ruthenium(II) complex [Ru(bpy)2ppd]2+ have been synthesized and characterized by elemental analysis, electrospray mass spectra and 1H NMR. The interaction of the complex with calf thymus DNA was investigated by spectroscopic and viscosity measurements. The results suggest that the complex binds to DNA via an intercalative mode and serves as a molecular "light switch" for DNA. Moreover, the complex has been found to promote the photocleavage of plasmid DNA pBR322 under irradiation at 365 nm. The mechanism studies reveal that singlet oxygen (1O2) and superoxide anion radical (O2*(-))play a significant role in the photocleavage.
authors.affiliation: Department of Chemistry, State Key Laboratory of Optoelectronic Materials and Technologies, The Key Laboratory of Gene Enginerring of Ministry of Education, Sun Yat-Sen University, Guanghou 510275, PR China.
authors.forename: Feng
authors.initials: F
authors.lastname: Gao
authors.forename: Hui
authors.initials: H
authors.lastname: Chao
authors.forename: Feng
authors.initials: F
authors.lastname: Zhou
authors.forename: Yi-Xian
authors.initials: YX
authors.lastname: Yuan
authors.forename: Bin
authors.initials: B
authors.lastname: Peng
authors.forename: Liang-Nian
authors.initials: LN
authors.lastname: Ji
mesh_terms: D004247:DNA / Q000737:chemistry* / Q000378:metabolism; D007364:Intercalating Agents / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D009942:Organometallic Compounds / Q000737:chemistry*; D010777:Photochemistry; D017975:Ruthenium Compounds / Q000737:chemistry*
chemical_list: D007364:Intercalating Agents; D009942:Organometallic Compounds; D017975:Ruthenium Compounds; D004247:DNA; C427203:calf thymus DNA