Biomolecules morph between conformations with distinct lifetimes according to their functional requirements. Mosquito-borne flaviviruses encode exoribonuclease-resistant RNAs (xrRNAs) that fold into knot-like structures to prevent exonuclease Xrn1 digestion. To achieve high Xrn1 resistance, xrRNAs contain molecular interactions with lifetimes that persist up to ten million times longer than canonical base pairs.
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