Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 102, Issue 3, Pages 589-593Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.0408561102
Keywords
peptide nucleic acid probe; polyelectrolytes; fluorescence energy transfer
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Funding
- NIGMS NIH HHS [R01 GM062958, GM62958-01] Funding Source: Medline
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A strand-specific DNA sensory method is described based on surface-bound peptide nucleic acids and water-soluble cationic conjugated polymers. The main transduction mechanism operates by taking advantage of the net increase in negative charge at the pepticle nucleic acid surface that occurs upon single-stranded DNA hybridization. Electrostatic forces cause the oppositely charged cationic conjugated polymer to bind selectively to the complementary surfaces. This approach circumvents the current need to label the probe or target strands. The polymer used in these assays is poly[9,9'-bis(6-NNN-trimethylammonium)hexyl)fluoreneco-alt-4,7-(2,1,3-benzothiadiazole) dibromide], which was specifically designed and synthesized to be compatible with excitation sources used in commonly used DNA microarray readers. Furthermore, the utility of poly[9,9'-bis(6-NN,N-trimethylammonium)hexyl)fluorene-co-alt-4,7-(2,1,3-benzothiadiazole) dibromide] has been demonstrated in homogenous and solid-state assays that involve fluorescence resonance energy transfer to a reporter dye (Cy5) and that can benefit from the light harvesting properties observed in water-soluble conjugated polymers.
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