Abstract
Hydroxyl radicals, generated by allowing an iron (II)·EDTA complex to react with hydrogen peroxide, have been employed to cleave the 160-base pair tyrT DNA fragment in the presence and absence of the minor groove-binding antibiotics netropsin and distamycin A. The control DNA cleavage pattern is practically independent of nucleotide sequence, which overcomes certain limitations of other footprinting techniques, so that additional information can be gained about the AT-rich sequence preference of the minor groove-binding ligands.
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