A novel 2',4'-BNA/LNA analog bridged by guanidine, termed as guanidine bridged nucleic acid (GuNA), was synthesized and incorporated into oligonucleotides. Thermal stabilities and nuclease resistance of GuNA-modified oligonucleotides were investigated and compared with those of 2',4'-BNA/LNA and natural DNA oligonucleotides. GuNA exhibited interestingly high binding affinity towards complementary ssDNA than 2',4'-BNA/LNA.
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Shrestha et al. (2013) studied this question.
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