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Abstract
A G-quadruplex DNA is composed of stacked G-quartets, each of which involves the planar association of four guanine bases. The size and planarity of a G-quartet are well-suited for interacting with a porphyrin ring through π-π stacking. We have demonstrated the formation of a stable coordination complex between heme, the iron (III)-protoporphyrin IX complex, and a parallel G-quadruplex DNA assembled from a single repeat sequence of the human telomere, TTAGGG. The heme-DNA complex was found to be remarkably similar, in various spectroscopic and functional properties, to hemoprotein such as myoglobin.
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