Peptide Nucleic Acid (PNA). Implications for the origin of the genetic material and the homochirality of life

Physics

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Structure And Bonding, Macromolecules And Polymer Molecules

Scientific paper

PNA is a pseudopeptide DNA mimic in which the natural nucleobases have been retained, but the backbone consists of N-(2-aminoethyl)glycine units to which the nucleobases are attached via methylene carbonyl linkers. The finding that PNA forms Warson-Crick-like helices with complementary DNA, RNA or PNA combined with the fact PNA is held together by amide bonds has made PNA of interest as a model for a primordial genetic material. Furthermore, the PNA backbone is achiral, while preferred chirality can be induced in PNA-PNA double helices by attached chiral ligands, thereby providing a new way of ``chiral amplification.'' Finally, it has been demonstrated that PNA-template directed synthesis of RNA and PNA is feasible.

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