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Cotranscriptional RNA folding forms structural intermediates that can be critically important for RNA biogenesis. This is especially true for transcriptional riboswitches that must undergo ligand-dependent structural changes during transcription to regulate the synthesis of downstream genes. Here, we systematically map the folding states traversed by the Clostridium beijerinckii pfl riboswitch as it controls transcription termination in response to the purine biosynthetic intermediate ZMP. Wedoi:10.1101/521930 fatcat:ttutr4iaqnbb7kch2fdn5puf3a