| Author(s) | Liu J; Zhang TX; Lu TB; Qu LH; Zhou H; Zhang QL; Ji LN
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| Title | DNA-binding and cleavage studies of macrocyclic copper(II) complexes
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| Source | JOURNAL OF INORGANIC BIOCHEMISTRY 91 (1): 269-276
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| Date | 2002 JUL 25
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| Type | Journal : Article
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| LCR: 5 NCR: 33 LCS: 0 GCS: 25
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| Address | Zhongshan Univ, Sch Chem & Chem Engn, State Key Lab Optoelect Mat & Technol, Guangzhou 510275, Peoples R China.
Zhengzhou Plast Factory 3, Zhengzhou 450052, Peoples R China.
Key Lab Gene Engn Minist Educ, Sch Life Sci, Guangzhou 510275, Peoples R China.
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| Reprint | Ji, LN, Zhongshan Univ, Sch Chem & Chem Engn, State Key Lab Optoelect
Mat & Technol, Guangzhou 510275, Peoples R China.
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| Abstract | Three hexaaza macrocyclic copper (H) 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 [CuL1]Cl-2 (L-1=3,10-bis(2-methylpyridine)- 1,3,5,8,10,12-hexaazacyclotetradecane), [CuL2]Cl-2 (L-2= 3,10-bis(2-propionitrile)-1,3,5,8,10,12-hexaazacyclotetradecane) and [CuL3]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 [CuL1]2+ could bind to DNA by partial intercalation via pyridine ring into the base pairs of DNA. [CuL2](2+) may bind to DNA by hydrogen bonding and hydrophobic interaction while [CuL3](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 H2O2. (C) 2002 Elsevier Science Inc. All rights reserved.
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