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The binding peculiarities of the water-soluble  meso -tetra-(4N-hydroxyethylpyridyl) porphyrin (H 2 TOEtPyP4) and its Cu- and Co-derivatives (CuTOEtPyP4 and CoTOEtPyP4) with synthetic double-stranded alternating polynucleotide poly(dG-dC).poly(dG-dC) were investigated by UV/Vis absorption and circular dichroism (CD) methods. It was shown that the porphyrins with planar structure such as H 2 TOEtPyP4 and CuTOEtPyP4 interact with poly(dG-dC).poly(dG-dC) via intercalation at low relative concentrations ( r = [porphyrin]/[polynucleotide] ), while at high  r  - via intercalation and external binding modes. In the case of no planar porphyrin CoTOEtPyP4 complexation occurs only by external binding mode. The binding constant  K band the exclusion parameter  n  calculated for H 2 TOEtPyP4, CuTOEtPyP4 and CoTOEtPyP4 porphyrins with poly(dG-dC).poly(dG-dC) complexes was 1.50 x10 7 ,  M−1  ( n  = 1.76); 9.29 x10 7 ,  M−1  ( n  = 1.18); and 0.28 x10 7 ,  M−1  ( n  = 2.65) correspondingly. The values of binding parameters for each porphyrin–poly(dG-dC).poly(dG-dC) complexes demonstrated good agreement with the proposed binding models. Communicated by Ramaswamy H. Sarma

The structural features of poly(dG-dC).poly(dG-dC) at complexation with some porphyrins