期刊
INORGANICA CHIMICA ACTA
卷 362, 期 6, 页码 1918-1924出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.ica.2008.09.011
关键词
Zinc complexes; Bipyridyl; Trimethylaminomethyl groups; Artificial nucleases; DNA cleavage
资金
- National Natural Science Foundation of China [20725103, 30770494, 20671098, 20529101]
- Guangdong provincial Natural Science Foundation [07117637]
- National Basic Research Program of China [2007CB815306]
The Zn(II) complexes of two bipyridyl derivatives with trimethylaminomethyl groups, [Zn(L-1)(3)](ZnBr4)(ClO4)(2)Br-4 center dot 12H(2)O (1) and [Zn(L-2)(3)](ClO4)(8) center dot H2O (2) (L-1 = [4,4'-(Me3NCH2)(2)-bpy](2+), L-2 = [5,5'-(Me3NCH2)(2)-bpy](2+) and bpy = 2,2'-bipyridyl), were synthesized and characterized. The structure of complex 1 has been determined by X-ray diffraction, and the configuration of ligand-coordinated Zn(II) ion can be well described as distorted octahedral. Species distribution of both complexes in aqueous solution was investigated by potentiometeric titration. DNA-binding ability of both complexes was studied by UV spectroscopy titration. Under hydrolytic condition, both complexes (150 mu M) can effectively cleave plasmid pBR322 DNA from supercoiled to nicked form, giving hydrolysis rate constants of 2.63 x 10 (5) and 9.92 x 10 (5) s (1), respectively (pH 7.75, 37 degrees C). The result shows that complex 2 is one of the most active artificial nucleases based on zinc. (c) 2008 Elsevier B.V. All rights reserved.
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