Crystal structure, DNA binding studies, nucleolytic property and topoisomerase I inhibition of zinc complex with 1,10-phenanthroline and 3-methyl-picolinic acid
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Data
2010-02-01
Autores
Seng, Hoi-Ling
Von, Sze-Tin
Tan, Kong-Wai
Maah, Mohd Jamil
Ng, Seik-Weng
Rahman, Raja Noor Zaliha Raja Abd
Caracelli, Ignez [UNESP]
Ng, Chew-Hee
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Springer
Resumo
Crystal structure analysis of the zinc complex establishes it as a distorted octahedral complex, bis(3-methylpicolinato-kappa(2) N,O)(2)(1,10-phenanthroline-kappa(2) N,N)-zinc(II) pentahydrate, [Zn(3-Me-pic)(2)(phen)]center dot 5H(2)O. The trans-configuration of carbonyl oxygen atoms of the carboxylate moieties and orientation of the two planar picolinate ligands above and before the phen ligand plane seems to confer DNA sequence recognition to the complex. It cannot cleave DNA under hydrolytic condition but can slightly be activated by hydrogen peroxide or sodium ascorbate. Circular Dichroism and Fluorescence spectroscopic analysis of its interaction with various duplex polynucleotides reveals its binding mode as mainly intercalation. It shows distinct DNA sequence binding selectivity and the order of decreasing selectivity is ATAT > AATT > CGCG. Docking studies lead to the same conclusion on this sequence selectivity. It binds strongly with G-quadruplex with human tolemeric sequence 5'-AG(3)(T(2)AG(3))(3)-3', can inhibit topoisomerase I efficiently and is cytotoxic against MCF-7 cell line.
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Zinc(II) ternary complex, Duplex and quadruplex DNA binding, Nucleolytic, Topo I inhibition, Molecular modeling, Docking
Como citar
Biometals. Dordrecht: Springer, v. 23, n. 1, p. 99-118, 2010.