Journal
JOURNAL OF INORGANIC BIOCHEMISTRY
Volume 83, Issue 1, Pages 49-55Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/S0162-0134(00)00132-X
Keywords
cobalt(III) complexes; DNA-binding; photocleavage
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Two complexes of [Co(phen)(2)IP](3+) (IP=imidazol[4,5-f][1,10]phenanthroline) and [Co(phen)(2)PIP](3+) (PLP=2-phenylimidazo[4,5-f][1,10]phenanthroline) have been synthesized and characterized by UV/VIS, IR, EA and mass spectra. The binding of the two complexes with calf thymus DNA has been investigated by absorption spectroscopy, cyclic voltammetry, viscosity measurements and DNA cleavage assay. The spectroscopic studies together with cyclic voltammetry and viscosity experiments support that both of the complexes bind to CT DNA by intercalation via IP or PIP into the base pairs of DNA. [Co(phen)(2)PIP](3+) binds more avidly to CT DNA than [Co(phen)(2)IP](3+), which is consistent with the extended planar and pi system of PIP. Noticeably, the two complexes have been found to be efficient photosensitisers for strand scissions in plasmid DNA. (C) 2001 Elsevier Science B.V. All rights reserved.
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