Interaction of Hoechst 33258 with repeating synthetic DNA polymers and natural DNA.

Journal of Biomolecular Structure & Dynamics
K F JorgensonJ H van de Sande

Abstract

Fluorescence, circular dichroism and sedimentation through cesium chloride gradient techniques were performed to study the physical properties of the binding of the bisbenzimidazole dye Hoechst 33258 (H33258) to natural DNAs and synthetic polynucleotides of defined repeating units. These studies show that Hoechst 33258 exhibits at least two modes of interaction with duplex DNA: (1) a strong base pair specific mode which requires at least 4 consecutive AT base pairs and (2) a weaker mode of binding which is significantly reduced in the presence of high salt (0.4 M NaCl) and exhibits no apparent base specificity. The H33258 binding was found to be sensitive to the substitutions in the minor groove elements of a series of synthetic polynucleotides supporting the model of H33258 binding in the minor groove of the DNA with AT rich sequences. Similar mode of binding was predicted in natural DNAs by methylation of dye-DNA complexes. Footprint analysis of the complex of dye to a pBR322 fragment also supports that a minimum of 4 consecutive AT base pairs are required for H33258 binding to DNA.

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