title: Zinc complexes with cyclic derivatives of alpha-ketoglutaric acid thiosemicarbazone: Synthesis, X-ray structures and DNA interactions.
abstract: Six new cyclic ligands derived from alpha-ketoglutaric acid thiosemicarbazone (H(3)ct) and their zinc complexes have been synthesized and characterized by analytical and spectroscopic (IR and NMR) studies. The X-ray structures of ligands Me-H(2)ct(C) (1), Allyl-H(2)ct(c) (3) and of complex [Zn(Me-Hct(C))(2)(OH(2))(2)].2H(2)O (7) have been determined. In complex (7) the zinc atom lies on a twofold axis and is surrounded in a tetrahedral coordination by two water molecules and two carboxylic oxygen donor atoms from the ligand. DNA titration in the UV-visible region and thermal denaturation have been employed to determine the details of DNA binding for the studied compounds. Studies of nuclease activity have also been performed with all our compounds through a gel electrophoresis experiment using plasmid pBR322 showing that no DNA breakings take place. Tests in vitro on human leukemia cell line U937 have been carried out on cell growth inhibition where solubility of the compounds allowed the experiments.
authors.affiliation: Dipartimento di Chimica Generale ed Inorganica, Chimica Analitica, Chimica Fisica, Parco Area delle Scienze 17/A, Università degli Studi di Parma, 43100 Parma, Italy.
authors.forename: Monica
authors.initials: M
authors.lastname: Baldini
authors.forename: Marisa
authors.initials: M
authors.lastname: Belicchi-Ferrari
authors.forename: Franco
authors.initials: F
authors.lastname: Bisceglie
authors.forename: Silvia
authors.initials: S
authors.lastname: Capacchi
authors.forename: Giorgio
authors.initials: G
authors.lastname: Pelosi
authors.forename: Pieralberto
authors.initials: P
authors.lastname: Tarasconi
mesh_terms: D045744:Cell Line, Tumor; D049109:Cell Proliferation / Q000187:drug effects; D018360:Crystallography, X-Ray; D004247:DNA / Q000737:chemistry* / Q000187:drug effects; D004354:Drug Screening Assays, Antitumor; D006801:Humans; D007656:Ketoglutaric Acids / Q000737:chemistry*; D008024:Ligands; D008958:Models, Molecular; D015394:Molecular Structure; D009942:Organometallic Compounds / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology; D012995:Solubility; D013696:Temperature; D013882:Thiosemicarbazones / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology; D020298:U937 Cells; D015032:Zinc / Q000737:chemistry*
chemical_list: D007656:Ketoglutaric Acids; D008024:Ligands; D009942:Organometallic Compounds; D013882:Thiosemicarbazones; D004247:DNA; D015032:Zinc