Bioinorganic Chemistry and Applications

Bioinorganic Chemistry and Applications / 2006 / Article

Open Access

Volume 2006 |Article ID 063703 | https://doi.org/10.1155/BCA/2006/63703

Alexander A. Chernonosov, Vladimir V. Koval, Dmitrii G. Knorre, Alexander A. Chernenko, Valentina M. Derkacheva, Eugenii A. Lukyanets, Olga S. Fedorova, "Conjugates of Phthalocyanines with Oligonucleotides as Reagents for Sensitized or Catalytic DNA Modification", Bioinorganic Chemistry and Applications, vol. 2006, Article ID 063703, 8 pages, 2006. https://doi.org/10.1155/BCA/2006/63703

Conjugates of Phthalocyanines with Oligonucleotides as Reagents for Sensitized or Catalytic DNA Modification

Received20 Aug 2004
Revised01 Dec 2004
Accepted03 Dec 2004
Published16 Feb 2006

Abstract

Several conjugates of metallophthalocyanines with deoxyribooligonucleotides were synthesized to investigate sequence-specific modification of DNA by them. Oligonucleotide parts of these conjugates were responsible for the recognition of selected complementary sequences on the DNA target. Metallophthalocyanines were able to induce the DNA modification: phthalocyanines of Zn(II) and Al(III) were active as photosensitizers in the generation of singlet oxygen 1O2, while phthalocyanine of Co(II) promoted DNA oxidation by molecular oxygen through the catalysis of formation of reactive oxygen species (2, H2O2, OH). Irradiation of the reaction mixture containing either Zn(II)- or Al(III)-tetracarboxyphthalocyanine conjugates of oligonucleotide pd(TCTTCCCA) with light of > 340 nm wavelength (Hg lamp or He/Ne laser) resulted in the modification of the 22-nucleotide target d(TGAATGGGAAGAGGGTCAGGTT). A conjugate of Co(II)-tetracarboxyphthalocyanine with the oligonucleotide was found to modify the DNA target in the presence of O2 and 2-mercaptoethanol or in the presence of H2O2. Under both sensitized and catalyzed conditions, the nucleotides G13G15 were mainly modified, providing evidence that the reaction proceeded in the double-stranded oligonucleotide. These results suggest the possible use of phthalocyanine-oligonucleotide conjugates as novel artificial regulators of gene expression and therapeutic agents for treatment of cancer.

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Copyright © 2006 Alexander A. Chernonosov et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


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