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RNA Polymerase (RNAP) is conserved in all animals, with bacterial, archaeal, and eukaryotic RNAPs sharing significant sequence, structural, and functional similarities. Among the three eukaryotic RNAPs, RNA Polymerase II is most similar to bacterial RNAP in terms of both structural organization and folding topologies of the enzyme subunits. However, these similarities are not reflected in their mechanism of action.
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Unlike eukaryotes, bacteria use a single RNA Polymerase (RNAP) to transcribe all genes. The different subunits of bacterial RNAPhave distinct functions. The multisubunit structure of the bacterial RNAP helps the enzyme to maintain catalytic function, facilitate assembly, interact with DNA and RNA, and self-regulate its activity.
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Interactions between RNA polymerase and the "core recognition element" counteract pausing.

Irina O Vvedenskaya1, Hanif Vahedian-Movahed2, Jeremy G Bird3

  • 1Department of Genetics and Waksman Institute, Rutgers University, Piscataway, NJ 08854, USA.

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Researchers identified a specific DNA sequence that causes RNA polymerase to pause during transcription. These findings reveal how interactions with the core recognition element help RNA polymerase overcome these pauses, ensuring gene expression.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Transcription elongation is a fundamental biological process.
  • Specific DNA sequences can halt RNA polymerase (RNAP) activity, leading to transcriptional pausing.
  • Understanding pausing mechanisms is crucial for regulating gene expression.

Purpose of the Study:

  • To identify sequence elements that induce transcriptional pausing genome-wide in Escherichia coli.
  • To investigate the role of RNAP-core recognition element (CRE) interactions in modulating pausing.

Main Methods:

  • Utilized native elongating transcript sequencing (NET-seq) for genome-wide analysis of transcription.
  • Employed a variant, merodiploid NET-seq (mNET-seq), to study mutant RNAP derivatives.
  • Analyzed in vivo transcriptional pausing in Escherichia coli.

Main Results:

  • Identified a consensus pause-inducing sequence element: G₋₁₀Y₋₁G(+1).
  • Demonstrated that RNAP-CRE interactions, known to stabilize initiation, also occur during elongation.
  • Showed these interactions stabilize RNAP in a posttranslocated state, facilitating pause read-through.

Conclusions:

  • Key sequence determinants of transcriptional pausing have been identified.
  • RNAP-CRE interactions play a significant role in modulating transcriptional pausing and read-through.
  • This study provides insights into the regulation of transcription elongation in bacteria.