DNA-binding and cleavage studies of macrocyclic copper(II) complexes.
Three hexaaza macrocyclic copper (II) complexes with different functional groups have been synthesized and characterized by elemental analysis and infrared spectra. Absorption and fluorescence spectral, cyclic voltammetric and viscometric studies have been carried out on the interaction of [CuL(1)]Cl(2) (L(1)[double bond]3,10-bis(2-methylpyridine)-1,3,5,8,10,12-hexaazacyclotetradecane), [CuL(2)]Cl(2) (L(2)[double bond]3,10-bis(2-propionitrile)-1,3,5,8,10,12-hexaazacyclotetradecane) and [CuL(3)]Cl(2) (L(3)=3,10-bis(2-hydroxyethyl)-1,3,5,8,10,12-hexaazacyclotetradecane) with calf thymus DNA. The results suggest that three complexes can bind to DNA by different binding modes. The spectroscopic studies together with viscosity experiments and cyclic voltammetry suggest that [CuL(1)](2+) could bind to DNA by partial intercalation via pyridine ring into the base pairs of DNA. [CuL(2)](2+) may bind to DNA by hydrogen bonding and hydrophobic interaction while [CuL(3)](2+) may be by weaker hydrogen bonding. The functional groups on the side chain of macrocycle play a key role in deciding the mode and extent of binding of complexes to DNA. Noticeably, the three complexes have been found to cleave double-strand pUC18 DNA in the presence of 2-mercaptoethanol and H(2)O(2).
State Key Laboratory of Optoelectronic Materials and Technologies, School of Chemistry and Chemical Engineering, Zhongshan University, Guangzhou 510275, PR China.
Jie
J
Liu
Tixiang
T
Zhang
Tongbu
T
Lu
Lianghu
L
Qu
Hui
H
Zhou
Qianling
Q
Zhang
Liangnian
L
Ji
D000818:Animals; D002417:Cattle; D003300:Copper / Q000737:chemistry*; D004247:DNA / Q000737:chemistry* / Q000378:metabolism*; D006571:Heterocyclic Compounds / Q000737:chemistry*; D015394:Molecular Structure; D013050:Spectrometry, Fluorescence
D006571:Heterocyclic Compounds; D003300:Copper; D004247:DNA