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The designed peptide 1-methylimidazole-2-carboxamide netropsin (2-ImN) binds specifically to the sequence 5'-TGACT-3'. Direct evidence from NMR spectroscopy is presented that this synthetic ligand binds DNA as a 2:1 complex, which reveals that the structure is an antiparallel dimer in the minor groove of DNA. This is in contrast to the 1:1 complexes usually seen with most crescent-shaped minor groove binding molecules targeted toward A+T-rich tracts but reminiscent of a dimeric motif found for distamycin at high concentrations. These results suggest that sequence-dependent groove width may play an important role in allowing an expanded set of DNA binding motifs for synthetic peptides.

proceedings of the national academy of sciences of the united states of america

Antiparallel side-by-side dimeric motif for sequence-specific recognition in the minor groove of DNA by the designed peptide 1-methylimidazole-2-carboxamide netropsin.