ArticleNucleic acids research2025
The displacement of the σ70 finger in initial transcription is highly heterogeneous and promoter-dependent.
Article in Nucleic acids research, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 3 papers.
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Who cites it
3 citing papers in PubMed.
- Unraveling single-molecule reactions via multiplexed in-situ DNA sequencing.Nature communications · 2026Article
- Structural basis of pausing during transcription initiation in mycobacterium tuberculosis.Nature communications · 2026Article
- Structural insights into σ28-dependent transcription initiation and its regulation by anti-sigma factor in Pseudomonas aeruginosa.Nucleic acids research · 2026Article
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Authors and funding
6 authors.
Funding
Abstract
Most bacterial sigma factors (σ) contain a highly conserved structural module, the 'σ-finger', which forms a loop that protrudes towards the RNA polymerase active centre in the open complex and has been implicated in pre-organization of template DNA, abortive initiation of short RNAs, initiation pausing, and promoter escape. Here, we introduce a novel single-molecule FRET (smFRET) assay to monitor σ-finger motions during transcription initiation and promoter escape. By performing real-time smFRET measurements, we determine that for all promoters studied, displacement occurs before promoter escape and can occur either before or after a clash with the extending RNA. We show that the kinetics of σ-finger displacement are highly dependent on the promoter, with implications for transcription kinetics and regulation. Analogous mechanisms may operate in the similar modules present across all kingdoms of life.
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