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. 1983 Sep 10;11(17):6121–6139. doi: 10.1093/nar/11.17.6121

Intercalative and nonintercalative binding of large cationic porphyrin ligands to calf thymus DNA.

M J Carvlin, R J Fiel
PMCID: PMC326339  PMID: 6889138

Abstract

The large meso-substituted porphine, meso-tetra(4-N-methylpyridyl)porphine has been identified as a DNA-interactive ligand with a capacity for intercalation (1,2). Subsequently, the 2-N-methyl, 3-N-methyl and N-trimethylanilinium analogues of this porphyrin intercalator have been obtained for physico-chemical analyses (absorption spectroscopy, viscometry, circular dichroism, unwinding of supercoiled DNA). In this paper we discuss the factors affecting the character of porphyrin binding (intercalative, as is the case for the 4-N-methyl and 3-N-methyl porphines, versus non-intercalative, as is the case for the 2-N-methyl and N-trimethylanilinium porphines) and the impact that porphyrins' binding has upon the structure of DNA. The molecular conformation of the porphyrin ligand varies slightly within this series so that the ability of a given porphyrin to intercalate may be correlated with the arrangement of charged groups, the planarity of the porphine ring and the effective width of the individual molecules. The results from these studies indicate that sequence selective binding occurs within a small aperture of solution conditions.

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Selected References

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