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An analog of the antibiotic netropsin containing two netropsin-like fragments linked covalently via a platinum atom has been synthesized. DNase I and hydroxyl radical footprinting studies have shown that this compound binds at selective sites on a DNA restriction fragment with a known nucleotide sequence. After X-ray irradiation of Pt-bis-netropsin--DNA complexes a platinum-mediated cleavage of DNA is observed at specific DNA sites. This enables one to determine the location of the synthetic ligand on the DNA with a precision of about one nucleotide. The cleavage activity seems to be related to the emission of Auger electrons from the platinum atom that cause rupture of the deoxyribose residues on the two DNA strands near the position of the platinum atom in the complex.

Sequence-specific cleavage of double-stranded DNA caused by X-ray ionization of the platinum atom in the Pt-Bis-netropsin—DNA complex