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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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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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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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Ribosome profiling or ribo-sequencing is a deep sequencing technique that produces a snapshot of active translation in a cell. It selectively sequences the mRNAs protected by ribosomes to get an insight into a cell’s translation landscape at any given point in time.
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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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Updated: May 5, 2026

Monitoring Protein-RNA Interaction Dynamics In Vivo at High Temporal Resolution Using χCRAC
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PRC2-RNA interactions: Viewpoint from Tom Cech, Chen Davidovich, and Richard Jenner.

Thomas R Cech1, Chen Davidovich2, Richard G Jenner3

  • 1Department of Biochemistry, BioFrontiers Institute, and Howard Hughes Medical Institute, University of Colorado, Boulder, CO 80309, USA.

Molecular Cell
|October 4, 2024
PubMed
Summary
This summary is machine-generated.

RNAs regulate polycomb repressive complex 2 (PRC2) activity, impacting epigenetic states. Capturing these essential RNA-PRC2 interactions in living cells presents significant challenges.

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Area of Science:

  • Biochemistry
  • Epigenetics
  • Molecular Biology

Background:

  • Polycomb repressive complex 2 (PRC2) is crucial for epigenetic regulation.
  • RNA molecules are increasingly recognized as regulators of epigenetic modifiers.
  • Existing models propose diverse mechanisms for RNA-mediated PRC2 regulation.

Purpose of the Study:

  • To summarize current research on RNA regulation of PRC2.
  • To highlight the role of RNA in maintaining epigenetic states.
  • To discuss challenges in studying PRC2-RNA interactions in vivo.

Main Methods:

  • Literature review of biochemical and structural studies.
  • Analysis of in vivo data.
  • Conceptual synthesis of existing research.

Main Results:

  • Multiple lines of evidence support RNA's role in modulating PRC2 activity.
  • RNA interactions are proposed to be key for epigenetic state maintenance.
  • In vivo studies face difficulties in capturing relevant PRC2-RNA interactions.

Conclusions:

  • RNA-dependent regulation of PRC2 is a significant mechanism in epigenetics.
  • Further research is needed to overcome technical hurdles in studying these interactions within living cells.