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Translational riboswitches located in the 5' UTR of the messenger RNA (mRNA) regulate translation through variation of the accessibility of the ribosome binding site (RBS). These are the result of conformational changes in the riboswitch RNA governed by ligand binding. Here, we use a combination of single-molecule colocalization techniques (Single-Molecule Kinetic Analysis of RNA Transient Structure (SiM-KARTS) and Single-Molecule Kinetic Analysis of Ribosome Binding (SiM-KARB)) and microscale thermophoresis (MST) to investigate the adenine-sensing riboswitch in
Blechar et al. (Tue,) studied this question.