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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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Solid-phase synthesis of pseudo-complementary peptide nucleic acids.

Makoto Komiyama1, Yuichiro Aiba, Takumi Ishizuka

  • 1Research Center for Advanced Science and Technology, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8904, Japan. komiyama@mkomi.rcast.u-tokyo.ac.jp

Nature Protocols
|April 5, 2008
PubMed
Summary

This study details the synthesis of pseudo-complementary peptide nucleic acid (pcPNA), a DNA analog with unique double-duplex invasion capabilities. The protocol outlines a 7-day solid-phase synthesis for this innovative molecule.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Synthetic Chemistry

Background:

  • Peptide nucleic acids (PNAs) are DNA analogs with unique binding properties.
  • Pseudo-complementary PNA (pcPNA) incorporates modified bases (D and U(s)) alongside G and C on a poly[N-(2-aminoethyl)glycine] backbone.
  • pcPNA exhibits significant potential for double-duplex invasion of DNA, altering biological and physicochemical properties.

Purpose of the Study:

  • To describe a protocol for the solid-phase synthesis of pcPNA.
  • To provide a method for creating pcPNA with modified bases 2,6-diaminopurine (D) and 2-thiouracil (U(s)).

Main Methods:

  • Solid-phase synthesis of pcPNA using a Boc-strategy.
  • Synthesis or custom ordering of D and U(s) monomers.
  • Assembly of pcPNA monomers (D, U(s), G, C) on a poly[N-(2-aminoethyl)glycine] backbone.

Main Results:

  • A complete protocol for pcPNA synthesis is presented.
  • The synthesis procedure is analogous to conventional PNA synthesis, with specific requirements for D and U(s) monomers.
  • The protocol, excluding monomer synthesis, is completed in approximately 7 days.

Conclusions:

  • Solid-phase synthesis of pcPNA is feasible and efficient.
  • The developed protocol enables the production of pcPNA for applications requiring DNA modification.
  • pcPNA synthesis offers a valuable tool for exploring DNA interactions and properties.