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Sequence-specific and Selective Recognition of Double-stranded RNAs over Single-stranded RNAs by Chemically Modified Peptide Nucleic Acids
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Sequence-specific and Selective Recognition of Double-stranded RNAs over Single-stranded RNAs by Chemically Modified Peptide Nucleic Acids

Published on: September 21, 2017

Peptide nucleic acids as tools for single-molecule sequence detection and manipulation.

Hagar Zohar1, Craig L Hetherington, Carlos Bustamante

  • 1Department of Chemical Engineering, California Institute for Quantitative Biosciences, and Howard Hughes Medical InstituteUniversity of California, Berkeley, California 94720, United States.

Nano Letters
|October 7, 2010
PubMed
Summary

Modified peptide nucleic acids (PNAs) enable strong, sequence-specific attachment of modifications to DNA. This advancement is crucial for various single-molecule experiments, enhancing data acquisition and analysis.

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Self-Assembly of Gamma-Modified Peptide Nucleic Acids into Complex Nanostructures in Organic Solvent Mixtures

Published on: June 26, 2020

Area of Science:

  • Molecular Biology
  • Biophysics
  • Biotechnology

Background:

  • Attaching modifications like fluorophores and haptens to DNA is essential for single-molecule experiments.
  • Existing methods face challenges in achieving strong and sequence-specific attachment.

Purpose of the Study:

  • To introduce modified peptide nucleic acids (PNAs) as a novel tool for sequence-specific DNA modification.
  • To demonstrate the utility of PNAs in single-molecule manipulation experiments.

Main Methods:

  • Utilized modified peptide nucleic acids (PNAs) for sequence-specific binding to double-stranded DNA (dsDNA).
  • Implemented PNAs in microfluidic flow and optical tweezers setups for DNA manipulation.
  • Assessed the strength and specificity of PNA tethers.

Main Results:

  • Demonstrated that modified PNAs can strongly and sequence-specifically attach to individual dsDNA molecules.
  • Validated PNA functionality in two distinct single-molecule manipulation techniques.
  • Confirmed PNAs as versatile and robust tethers for DNA.

Conclusions:

  • Modified PNAs offer a powerful and reliable method for labeling and manipulating individual DNA molecules.
  • PNAs significantly advance capabilities in single-molecule biophysics and molecular biology research.