title: DNA phosphodiester bond hydrolysis mediated by Cu(II) and Zn(II) complexes of 1,3,5,-triamino-cyclohexane derivatives.
abstract: The hydrolytic activity of the 1,3,5-triaminocyclohexane derivatives TACH, TACI and TMCA complexed to Zn(II) and Cu(II) towards a model phosphoric ester and plasmid DNA has been evaluated by means of spectroscopic and gel-electrophoresis techniques. At conditions close to physiological, a prominent cleavage effect mediated by the nature of the ligand and metal ion was generally observed. TACI complexes are the most active in relaxing supercoiled DNA, the effect being explained by the affinity of the hydroxylated ligand for the nucleic acid. As indicated by the dependence of cleavage efficiency upon pH, Zn(II)-complexes act by a purely hydrolytic mechanism. In the case of Cu(II)-complexes, although hydrolysis should be prominent, involvement of an oxidative pathway cannot be completely ruled out.
authors.affiliation: University of Padova, Department of Pharmaceutical Sciences, Italy.
authors.forename: C
authors.initials: C
authors.lastname: Sissi
authors.forename: F
authors.initials: F
authors.lastname: Mancin
authors.forename: M
authors.initials: M
authors.lastname: Palumbo
authors.forename: P
authors.initials: P
authors.lastname: Scrimin
authors.forename: P
authors.initials: P
authors.lastname: Tecilla
authors.forename: U
authors.initials: U
authors.lastname: Tonellato
mesh_terms: D002412:Cations / Q000494:pharmacology; D003300:Copper / Q000494:pharmacology*; D003511:Cyclohexanols / Q000737:chemistry / Q000494:pharmacology*; D003514:Cyclohexylamines / Q000737:chemistry / Q000494:pharmacology*; D004269:DNA, Bacterial / Q000187:drug effects; D004278:DNA, Superhelical / Q000187:drug effects; D006868:Hydrolysis; D007700:Kinetics; D015394:Molecular Structure; D010755:Organophosphates / Q000378:metabolism; D010084:Oxidation-Reduction; D013329:Structure-Activity Relationship; D015032:Zinc / Q000494:pharmacology*
chemical_list: C421443:1,3,5-triamino-2,4,6-trihydroxycyclohexane; C421445:1,3,5-triamino-2,4,6-trimethoxycyclohexane; C421444:1,3,5-triaminocyclohexane; D002412:Cations; D003511:Cyclohexanols; D003514:Cyclohexylamines; D004269:DNA, Bacterial; D004278:DNA, Superhelical; D010755:Organophosphates; C048445:2,4-dinitrophenyl diethyl phosphate; D003300:Copper; D015032:Zinc