DNA interactions of a functionalized ruthenium(II) mixed-polypyridyl complex [Ru(bpy)2ppd]2+

J Inorg Biochem. 2006 Sep;100(9):1487-94. doi: 10.1016/j.jinorgbio.2006.04.008.

Abstract

A novel polypyridyl ligand pteridino[7,6-f][1,10]phenanthroline-1,13(10H,12H)-dione (ppd) and its ruthenium(II) complex [Ru(bpy)2ppd]2+ have been synthesized and characterized by elemental analysis, electrospray mass spectra and 1H NMR. The interaction of the complex with calf thymus DNA was investigated by spectroscopic and viscosity measurements. The results suggest that the complex binds to DNA via an intercalative mode and serves as a molecular "light switch" for DNA. Moreover, the complex has been found to promote the photocleavage of plasmid DNA pBR322 under irradiation at 365 nm. The mechanism studies reveal that singlet oxygen (1O2) and superoxide anion radical (O2*(-))play a significant role in the photocleavage.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • DNA / chemistry*
  • DNA / metabolism
  • Intercalating Agents / chemistry*
  • Magnetic Resonance Spectroscopy
  • Molecular Structure
  • Organometallic Compounds / chemistry*
  • Photochemistry
  • Ruthenium Compounds / chemistry*

Substances

  • Intercalating Agents
  • Organometallic Compounds
  • Ruthenium Compounds
  • DNA
  • calf thymus DNA