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Regulation of promoter-proximal transcription elongation: enhanced DNA scrunching drives ?Q antiterminator-dependent escape from a ?70-dependent pause.

ABSTRACT: During initial transcription, RNA polymerase remains bound at the promoter and synthesizes RNA without movement along the DNA template, drawing downstream DNA into itself in a process called scrunching and thereby storing energy to sever the bonds that hold the enzyme at the promoter. We show that DNA scrunching also is the driving force behind the escape of RNA polymerase from a regulatory pause of the late gene operon of bacteriophage ?, and that this process is enhanced by the activity of the Q(?) antiterminator. Furthermore, we show that failure of transcription complexes to escape the pause results in backtracking and arrest in a process analogous to abortive initiation. We identify a sequence element that modulates both abortive synthesis and the formation of arrested elongation complexes.

SUBMITTER: Strobel EJ

PROVIDER: S-EPMC4005639 | biostudies-literature | 2014 Apr

REPOSITORIES: biostudies-literature

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Regulation of promoter-proximal transcription elongation: enhanced DNA scrunching drives λQ antiterminator-dependent escape from a σ70-dependent pause.

Strobel Eric J EJ Roberts Jeffrey W JW

Nucleic acids research 20140217 8

During initial transcription, RNA polymerase remains bound at the promoter and synthesizes RNA without movement along the DNA template, drawing downstream DNA into itself in a process called scrunching and thereby storing energy to sever the bonds that hold the enzyme at the promoter. We show that DNA scrunching also is the driving force behind the escape of RNA polymerase from a regulatory pause of the late gene operon of bacteriophage λ, and that this process is enhanced by the activity of the ...[more]

PMID: 24550164

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