title: Ternary zinc(II)-dipeptide complexes for the hydrolytic cleavage of DNA at physiological pH.
abstract: A series of Zn(II) complexes with cysteinylglycine (CysGly) and histidylserine (HisSer), and of CysGly and histidylphenylalanine (HisPhe) were investigated. Complex stabilities were determined potentiometrically, and binding geometries were probed by means of 1H-NMR spectroscopy, using Co(II) instead of Zn(II) as a spectroscopic marker. The ternary 1:1:1 complexes [Zn(II)(CysGly)(HisSer)] and [Zn(II)(CysGly)(HisPhe)] were shown by UV experiments, fluorescence titration, and gel electrophoresis to intercalate with DNA, and to hydrolytically cleave supercoiled DNA (form-I), partly also circular (form-II) DNA, under physiological conditions (37 degrees, H2O, pH 7.5).
authors.affiliation: Department of Chemistry, Osmania University, Hyderabad-500 007, India. rabi_pr@rediffmail.com
authors.forename: Pulimamidi R
authors.initials: PR
authors.lastname: Reddy
authors.forename: Sepuru K
authors.initials: SK
authors.lastname: Mohan
authors.forename: Kandibanda S
authors.initials: KS
authors.lastname: Rao
mesh_terms: D004247:DNA / Q000737:chemistry* / Q000378:metabolism; D004151:Dipeptides / Q000737:chemistry* / Q000378:metabolism; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D015394:Molecular Structure; D015032:Zinc / Q000737:chemistry*
chemical_list: D004151:Dipeptides; C516949:histidylserine; C022144:histidylphenylalanine; C028505:cysteinylglycine; D004247:DNA; D015032:Zinc