Not all 2',4'-bridged modifications stabilize DNA/RNA duplexes
Tomoka Akita1,2, Elisa Tomita-Sudo2, Shin Itoh1
1Faculty of Frontiers of Innovative Research in Science and Technology, Konan University, Kobe, Japan.
Abstract:
2',4'-Bridged modifications such as 2'-O,4'-C-methylene-bridged nucleotides (LNAs) and 2'-O,4'-C-ethylene-bridged nucleotides (ENAs) provide high binding affinity for duplex formation. Stabilization by the introduction of the bridged nucleic acids is considered to be due to pre-organization. In this study, we found that the introduction of 2',4'-C-bridged 2'-deoxynucleotides (CRNs; Conformationally Restricted Nucleotides) into DNA/RNA duplexes leads to destabilization, as opposed to the previously accepted notion that 2',4'-bridged modifications always lead to stabilization.
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