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We provide a comprehensive analysis of transcription in real time by T7 RNA Polymerase (RNAP) using single-molecule fluorescence resonance energy transfer by monitoring the entire life history of transcription initiation, including stepwise RNA synthesis with near base-pair resolution, abortive cycling, and transition into elongation. Kinetically branching pathways were observed for abortive initiation...
Elucidating the mechanism of transcription initiation by RNA polymerases (RNAP) is essential for understanding gene transcription and regulation. Although several models, such as DNA scrunching, RNAP translation, and RNAP rotation, have been proposed, the mechanism of initiation by T7 RNAP has remained unclear. Using ensemble and single-molecule Förster resonance energy transfer (FRET) studies, we...
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