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Primer-Free Aptamer Selection Using A Random DNA Library
Published on: July 27, 2010
Selective pairing of polyfluorinated DNA bases
1Department of Chemistry, Stanford University, Stanford, California 94305-5080, USA.
Journal of the American Chemical Society
|March 12, 2004
Summary
Novel fluorinated DNA base pairs offer selective pairing, enhancing duplex stability against mismatches. These hydrophobic analogues show potential for orthogonal genetic systems.
Area of Science:
- Synthetic organic chemistry
- Biochemistry
- Molecular biology
Background:
- Natural DNA base pairing relies on hydrogen bonds.
- Exploring alternative base pairing systems can expand DNA's functional capabilities.
- Fluorinated organic molecules offer unique electronic and hydrophobic properties.
Purpose of the Study:
- To investigate novel, non-hydrogen-bonding DNA base pairs using fluorinated nucleoside analogues.
- To assess the impact of these synthetic bases on DNA duplex stability.
- To evaluate the potential of these analogues for orthogonal genetic systems.
Main Methods:
- Synthesis of fluorinated nucleoside analogues (tetrafluorobenzene and tetrafluoroindole).
- Construction of DNA duplexes incorporating these analogues.
- DNA melting temperature studies to quantify duplex stability.
Main Results:
- Fluorinated DNA duplexes showed greater stabilization compared to nonfluorinated controls.
- Hydrophobic analogues were destabilizing relative to natural base pairs but stabilized against mismatches.
- Selective pairing is likely driven by solvent avoidance of hydrophobic surfaces within the duplex.
Conclusions:
- Polyfluoroaromatic bases can form selective, non-hydrogen-bonding DNA base pairs.
- These synthetic bases offer enhanced stability against mismatches.
- Potential applications include developing new base-pairing systems orthogonal to the natural genetic system.
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