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Updated: Dec 30, 2025

Sequence-specific and Selective Recognition of Double-stranded RNAs over Single-stranded RNAs by Chemically Modified Peptide Nucleic Acids
Published on: September 21, 2017
Metal-Dependent Nucleobase Recognition by Picolinamide
Rohit A Dengale1,2, Shankar R Thopate2, Tuomas Lönnberg1
1Department of Chemistry, University of Turku, Vatselankatu 2, 20014, Turku, Finland.
Abstract:
A C-nucleoside featuring picolinamide as the base moiety has been synthesized and incorporated in the middle of a DNA oligonucleotide. The melting temperatures of duplexes formed by this modified oligonucleotide with its unmodified counterparts placing either adenine, cytosine, guanine or thymine opposite to the picolinamide residue were found to be highly dependent on the identity and concentration of transition metal ions in the samples. For example, AgI uniquely promoted pairing with adenine and PdII with guanine. Pairing with cytosine, on the other hand, was retarded by all of the metal ions studied (AgI , CuII , HgII , NiII , PdII and ZnII ).
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