Abstract
Peptide ribonucleic acid (PRNA) is one of artificial nucleic acids, which enables us to control its nucleobase orientation and recognition behavior by external factors through the synergetic effects of reversible borate ester formation and intramolecular hydrogen bond formation. In this study, a series of novel alpha-PRNA oligomers, possessing alternative alpha-PRNA/basic amino acid sequences, were newly designed, synthesized, and evaluated as the second-generation PRNA. As expected, these alpha-PRNAs indeed formed highly stable sequence-specific complexes with the complementary DNAs, for which both the conventional hydrogen-bonding interactions between the complementary nucleobase pairs and the electrostatic interactions between the basic amino acid's ammonium cation and the DNA's phosphate anion on the backbone are jointly responsible.
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