title: Toward novel DNA binding metal complexes: structure and basic kinetic data of [M(9MeG)2(CH3OH)(CO)3]+(M = 99Tc, Re).
abstract: To study the interaction of the fac-[M(CO)(3)](+) moiety (M = (99m)Tc, (188)Re) with DNA bases, we reacted [M(OH(2))(3)(CO)(3)](+) with 9-methylguanine (9-MeG), guanosine (G), and 2-deoxyguanosine (2dG). Two bases bind to the metal center via the N7 atoms. X-ray structure analysis of [(99)Tc(CH(3)OH)(9-MeG)(2)(CO)(3)](+) (4) (monoclinic, I2/a, a = 28.7533(14) A, b = 8.0631(4) A, c = 32.3600(15) A, beta = 91.543(6) degrees, V = 7499.6(6) A(3), Z = 8) and [Re(OH(2))(9-MeG)(2)(CO)(3)](+) (7) (monoclinic, P2(1)/n, a = 12.2873(11) A, b = 16.0707(13) A, c = 14.1809(16) A, beta = 103.361(12) degrees, V = 2724.4(5) A(3), Z = 4) reveals that the two bases are in a head-to-tail (HT) orientation. Kinetic studies show that the rates of substitution of the purine bases are comparable to that of one of the active forms of cisplatin. The bis-substituted complexes are generally less stable than the platinum adducts, and metalation of the bases is reversible.
authors.affiliation: Institute of Inorganic Chemistry, University of Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland.
authors.forename: Fabio
authors.initials: F
authors.lastname: Zobi
authors.forename: Bernhard
authors.initials: B
authors.lastname: Spingler
authors.forename: Thomas
authors.initials: T
authors.lastname: Fox
authors.forename: Roger
authors.initials: R
authors.lastname: Alberto
mesh_terms: D018360:Crystallography, X-Ray; D004247:DNA / Q000737:chemistry*; D003849:Deoxyguanosine / Q000737:chemistry*; D006147:Guanine / Q000031:analogs & derivatives* / Q000737:chemistry*; D007700:Kinetics; D008968:Molecular Conformation; D019906:Nuclear Magnetic Resonance, Biomolecular; D009942:Organometallic Compounds / Q000138:chemical synthesis* / Q000737:chemistry; D015609:Organotechnetium Compounds / Q000138:chemical synthesis* / Q000737:chemistry; D011687:Purines; D019275:Radiopharmaceuticals / Q000138:chemical synthesis* / Q000737:chemistry; D012211:Rhenium / Q000737:chemistry*; D013667:Technetium / Q000737:chemistry
chemical_list: D009942:Organometallic Compounds; D015609:Organotechnetium Compounds; D011687:Purines; D019275:Radiopharmaceuticals; C116701:9-methylguanine; D006147:Guanine; D012211:Rhenium; D013667:Technetium; D004247:DNA; D003849:Deoxyguanosine; C030985:purine