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A non-canonical base pairing is an interaction between two bases of a nucleic acid other than the standard base pairings, which are adenine–thymine in DNA, adenine–uracil in RNA, and cytosine–guanine in both.
Non-canonical base pairings commonly occur in the secondary structure of RNA (e.g. pairing of G with U), and in tRNA recognition. They are typically less stable than standard base pairings.
See also
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- Roy, Ashim; et al. (2008). "Structure, Stability, and Dynamics of Canonical and Noncanonical Base Pairs: Quantum Chemical Studies". J. Phys. Chem. B. 112 (12): 3786–3796. doi:10.1021/jp076921e.
- Hermann, Thomas; Westhof, Eric (1999). "Non-Watson-Crick base pairs in RNA-protein recognition" (PDF). Chemistry and Biology (6): 335–343.
- Lemieux, Sébastien; Major, François (1 October 2002). "RNA canonical and non-canonical base pairing types: a recognition method and complete repertoire". Nucleic Acids Res. 30 (19): 4250–4263.