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Related Concept Videos

RNA Polymerase II Accessory Proteins02:36

RNA Polymerase II Accessory Proteins

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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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Bacterial RNA Polymerase00:43

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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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Transcription Initiation01:47

Transcription Initiation

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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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Eukaryotic RNA Polymerases00:58

Eukaryotic RNA Polymerases

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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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TRAP-rc, Translating Ribosome Affinity Purification from Rare Cell Populations of Drosophila Embryos
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Rtr1 and RPAP2: versatile players in transcription and more.

Ana Isabel Garrido-Godino1, Francisco Navarro1,2

  • 1Departamento de Biología Experimental, Universidad de Jaén, Jaén, Spain.

Transcription
|November 28, 2025
PubMed
Summary
This summary is machine-generated.

Rtr1 and its human counterpart RPAP2 are key regulators of RNA Polymerase II transcription. Their precise function as phosphatases or cofactors is debated, but they impact multiple stages of gene expression and disease.

Keywords:
CTD phosphataseRNA pol II biogenesisTranscriptioncancermRNA decayncRNAs

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Area of Science:

  • Molecular Biology
  • Gene Expression Regulation
  • Biochemistry

Background:

  • Eukaryotic transcription relies on RNA Polymerase II (RNA pol II) progression, influenced by its C-terminal domain (CTD) post-translational modifications (PTMs) and trans-acting factors.
  • Rtr1 (yeast) and RPAP2 (human) are multifunctional regulators of RNA pol II, with proposed roles in CTD dephosphorylation.

Purpose of the Study:

  • To review the diverse functions of Rtr1 and RPAP2 in RNA Polymerase II regulation.
  • To discuss the ongoing debate regarding their enzymatic activity (phosphatase vs. cofactor) and their roles in various cellular processes.
  • To explore the involvement of human RPAP2 in disease pathogenesis.

Main Methods:

  • Review of existing literature, including structural and biochemical studies.
  • Analysis of functional data implicating Rtr1 and RPAP2 in transcription and post-transcriptional events.
  • Discussion of disease-associated studies involving human RPAP2.

Main Results:

  • Evidence suggests Rtr1/RPAP2 are involved in RNA pol II biogenesis, nuclear transport, transcriptional elongation, and termination.
  • Structural and biochemical data raise questions about whether Rtr1/RPAP2 are direct CTD phosphatases or act as cofactors.
  • Rtr1's functions extend to post-transcriptional mRNA stability.

Conclusions:

  • Rtr1 and RPAP2 are critical regulators of RNA Polymerase II with multifaceted roles throughout gene expression.
  • Their precise mechanism of action at the CTD requires further elucidation.
  • Human RPAP2 has implications in various disease states, warranting further investigation.