Abstract
Engineered RNAs have applications in diverse fields from biomedical to environmental. In many cases, the folding of the RNA is critical to its function. Here we describe a strategy to improve the response time of a riboswitch-based fluorescent biosensor. Systematic mutagenesis was performed to either make transpose or transition base pair mutants or introduce orthogonal base pairs. Both natural and unnatural base pair mutants were found to improve the biosensor response time without compromising fold turn-on or ligand affinity. These strategies can be transferred to improve the performance of other RNA-based tools.
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