Title

Porphyrin Interactions With Nucleic Acids

Document Type

Article

Publication Date

1983

Published In

Inorganica Chimica Acta: Bioinorganic Chemistry

Abstract

The interactions of tetrakis(4-N-methylpyridyl)porphine (H₂TMpyP-4) and its copper(II), nickel(II), zinc(II), cobalt(III), iron(III), and manganese(III) derivatives with several nucleic acids have been investigated. Spectrophotometric titrations of H2TMpyP-4 and Cu(II)TMpyP-4 with the synthetic polymer poly(dG-dC) could be analyzed by a near-neighbor exclusion model leading to n ≈ 2 and equilibrium binding constants of 7.7 × 10⁵M⁻¹ and 8.0 × 10⁵M⁻¹, respectively. The other metal derivatives (except for the nickel porphyrin) do not provide sufficiently large color changes with poly(dG-dC) to allow analysis.

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