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Related Concept Videos

Bacterial RNA Polymerase00:43

Bacterial RNA Polymerase

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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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Proteins that regulate transcription can do so either via direct contact with RNA Polymerase or through indirect interactions facilitated by adaptors, mediators, histone-modifying proteins, and nucleosome remodelers. Direct interactions to activate transcription is seen in bacteria as well as in some eukaryotic genes. In these cases, upstream activation sequences are adjacent to the promoters, and the activator proteins interact directly with the transcriptional machinery. For example, in...
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Eukaryotic RNA Polymerases00:58

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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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Bacterial Transcription01:53

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RNA polymerase (RNAP) carries out DNA-dependent RNA synthesis in both bacteria and eukaryotes. Bacteria do not have a membrane-bound nucleus. So, transcription and translation occur simultaneously, on the same DNA template.
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Transcription Initiation01:47

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Initiation is the first step of transcription in eukaryotes. Prokaryotic RNA Polymerase (RNAP) can bind to the template DNA and start transcribing. On the other hand, transcription in eukaryotes requires additional proteins, called transcription factors, to first bind to the promoter region in the DNA template. This binding helps recruit the specific RNAP that can assemble on the DNA and start transcription.
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In eukaryotic cells, nascent mRNA transcripts need to undergo many post-transcriptional modifications to reach the cell cytoplasm and translate into functional proteins. For a long time, transcription and pre-mRNA processing were considered two independent events that occur sequentially in the cell. However, it has now been well established that transcription and pre-mRNA processing are two simultaneous processes that are precisely regulated inside the cell.
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Updated: Sep 10, 2025

Artificial RNA Polymerase II Elongation Complexes for Dissecting Co-transcriptional RNA Processing Events
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Widespread epistasis shapes RNA polymerase II active site function and evolution.

Bingbing Duan1, Chenxi Qiu2,3, Sing-Hoi Sze4,5

  • 1Department of Biological Sciences, University of Pittsburgh, Pittsburgh, PA, USA.

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|August 27, 2025
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Summary
This summary is machine-generated.

Investigating the RNA polymerase II trigger loop in yeast reveals its crucial interactions. This study maps the trigger loop's "interaction landscape," showing its function is tied to its specific enzyme environment.

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Area of Science:

  • Molecular Biology
  • Structural Biology
  • Biochemistry

Background:

  • Multi-subunit RNA polymerases are essential for transcription across all life forms.
  • The trigger loop is a dynamic, conserved active site domain critical for transcription cycle steps.
  • Mutations in the RNA polymerase II trigger loop lead to distinct phenotypes affecting catalysis.

Purpose of the Study:

  • To structurally map the interaction landscape of the RNA polymerase II trigger loop.
  • To understand how residue interactions influence trigger loop function and transcription.
  • To investigate the impact of mutations on the RNA polymerase II active site network.

Main Methods:

  • Deep mutational scanning was employed on Saccharomyces cerevisiae RNA polymerase II.
  • A structural genetics approach was used to analyze residue interactions.
  • The study focused on the trigger loop and its surrounding domains.

Main Results:

  • The research identified key residue interactions within and around the RNA polymerase II trigger loop.
  • A comprehensive "interaction landscape" of the trigger loop was determined.
  • Connections between trigger loop residues and other domains were revealed.

Conclusions:

  • Trigger loop function is intrinsically linked to its specific enzymatic context.
  • Understanding these interactions provides insights into transcription regulation.
  • This work highlights the importance of residue networks in enzyme activity.