Abstract
The Human Genome Project as well as sequencing of the genomes of other organisms offers a wealth of DNA targets for both therapeutic and diagnostic applications, and it is important to develop additional DNA binding motifs to fully exploit the potential of this new information. We have recently found that an aromatic dication, DB293, with an amidine-phenyl-furan-benzimidazole-amidine structure can recognize specific sequences of DNA by binding in the minor groove as a dimer [Wang, L., Bailly, C., Kumar, A., Ding, D., Bajic, M., Boykin, D. W., and Wilson, W. D. (2000) Proc. Natl. Acad. Sci. U.S.A. 97, 12-16]. The dimer binding is strong, highly cooperative and, in contrast to many closely related heterocyclic dications, has both GC and AT base pairs in the minor groove binding site. The aromatic heterocycle stacked dimer is quite different in structure from the polyamide-lexitropsin type compounds, and it is a dication while all lexitropsin dimers are monocations. The heterocyclic dimer represents only the second small molecule class that can recognize mixed sequences of DNA. To test the structural limits on the new type of complex, it is important to probe the influence of compound charge, chemical groups, and structural featur...Continue Reading
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