title: Study of the reactions between platinum(II) complexes and L-methionine in the presence and absence of 5'-GMP.
abstract: The reactions of the platinum(II) complexes, [Pt(dien)(H(2)O)](2+), [PtCl(dien)](+) and [PtBr(dien)](+) (dien is diethylenetriamine) with some biologically relevant ligands such as inosine (INO), inosine-5'-monophosphate (5'-IMP), guanosine-5'-monophosphate (5'-GMP), glutathione (GSH) and l-methionine (S-meth), have been studied by UV-Visible spectrophotometry and (1)H NMR spectroscopy. Kinetic and thermodynamic parameters of these reactions were determined. Competitive reactions of [PtCl(dien)](+) with l-methionine and 5'-GMP demonstrated initially rapid formation of [Pt(dien)(S-meth)](2+) followed by displacement of l-methionine by 5'-GMP. In the later stages the concentration of [Pt(dien)(N7-GMP)](2+) is predominant. The results are analyzed in reference to the anti-tumour activity of Pt(II) complexes.
authors.affiliation: University of Kragujevac, Faculty of Science, Department of Chemistry, Serbia.
authors.forename: Tanja
authors.initials: T
authors.lastname: Soldatović
authors.forename: Zivadin D
authors.initials: ZD
authors.lastname: Bugarcić
mesh_terms: D006157:Guanosine Monophosphate / Q000737:chemistry*; D007700:Kinetics; D008024:Ligands; D009682:Magnetic Resonance Spectroscopy; D008715:Methionine / Q000737:chemistry*; D015394:Molecular Structure; D009942:Organometallic Compounds / Q000737:chemistry*; D010984:Platinum / Q000737:chemistry*; D013056:Spectrophotometry, Ultraviolet; D013816:Thermodynamics; D013997:Time Factors
chemical_list: D008024:Ligands; D009942:Organometallic Compounds; D010984:Platinum; D006157:Guanosine Monophosphate; D008715:Methionine