Directed assembly of DNA-functionalized gold nanoparticles using pyrrole-imidazole polyamides

Journal of the American Chemical Society
Zeljka KrpetićDuncan Graham

Abstract

Traditional methods for the construction of nanoparticle arrays and lattices exploit Watson-Crick base pairing of single-stranded DNA sequences as a proxy for self-assembly. Although this approach has been utilized in a variety of applications in nanoassembly, diagnostics, and biomedicine, the diversity of this recognition lexicon could be considerably increased by developing strategies that recognize the base-pairing landscape of double-stranded DNA (dsDNA) sequences. Herein we describe the first report of programmed gold nanoparticle (GNP) aggregation directed by the recognition of dsDNA sequences using pyrrole-imidazole polyamide-GNP (PA-GNP) conjugates. We demonstrate the reversibility and selectivity of this strategy for forming GNP aggregates in the presence of fully matched dsDNA sequences relative to dsDNA sequences containing one- and two-base-pair mismatches.

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