Abstract
The interaction between small molecules and telomeric quadruplex DNA has received great attention because of its importance in molecular recognition and anticancer drug design. Using UV/vis absorption titration, thermal melting, circular dichroism spectroscopy, and electrospray ionization mass spectrometry, we examined the formation of lead ion induced guanine quadruplexes (Pb-G4) from oligonucleotide AG3(T2AG3)3 and their interaction with a zinc derivative of 5,10,15,20-tetrakis(N-methyl-4-pyridyl)porphyrin (Zn-TMPyP). The binding of lead ion to the oligonucleotide was found to have an unusually high affinity and followed a 1:1 stoichiometry, and the resultant Pb-G4 structure was stabilized by Zn-TMPyP binding. Owing to the steric hindrance of the axial ligand of zinc and also the relatively rigid structure of Pb-G4, intercalation of Zn-TMPyP between adjacent guanine quartets is precluded, thus allowing the end-stacking binding mode to be characterized exclusively. In conjunction with a big redshift (more than 8 nm) in the absorption spectrum, we demonstrate that a conservative induced circular dichroism is an important signature for end-stacking of porphyrins on guanine quadruplexes.
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Acknowledgments
This work was financially supported in part by New Century Excellent Talents in University (07–0134), National Natural Science Foundation of China (20603003), the Research Fund for the Doctoral Program of Higher Education (20070141071), and Science Research Foundation of Dalian University of Technology (07014).
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Pan, J., Zhang, S. Interaction between cationic zinc porphyrin and lead ion induced telomeric guanine quadruplexes: evidence for end-stacking. J Biol Inorg Chem 14, 401–407 (2009). https://doi.org/10.1007/s00775-008-0457-5
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DOI: https://doi.org/10.1007/s00775-008-0457-5