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Related Concept Videos

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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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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RPRD1A and RPRD1B are human RNA polymerase II C-terminal domain scaffolds for Ser5 dephosphorylation.

Zuyao Ni1, Chao Xu2, Xinghua Guo1

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RPRD1A and RPRD1B proteins bind to phosphorylated RNA polymerase II C-terminal domains (CTD) and recruit RPAP2 phosphatase. This interaction helps regulate transcription and RNA processing by coordinating CTD dephosphorylation.

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Gene Regulation

Background:

  • The RNA polymerase II (RNAPII) C-terminal domain (CTD) is crucial for transcription, RNA processing, and chromatin modification.
  • Dynamic phosphorylation of CTD repeats regulates the recruitment of specific factors.
  • Understanding CTD-interaction partners is key to deciphering transcription regulation.

Purpose of the Study:

  • To investigate the interaction of RPRD1A and RPRD1B proteins with the RNAPII CTD.
  • To elucidate the structural basis of CTD recognition by RPRD1A, RPRD1B, and RPRD2.
  • To understand the role of RPRD1A and RPRD1B in coordinating CTD dephosphorylation.

Main Methods:

  • Co-immunoprecipitation to study protein-protein interactions.
  • Yeast three-hybrid assays for protein interactions.
  • Crystallography to determine the structures of CTD-interaction domains (CIDs).
  • Biochemical assays to analyze phosphatase activity.

Main Results:

  • RPRD1A and RPRD1B form dimers and interact with phosphorylated RNAPII CTD repeats (S2 and S7).
  • Crystal structures reveal the molecular basis for CTD recognition by RPRD1A, RPRD1B, and RPRD2 CIDs.
  • RPRD1A and RPRD1B associate with RPAP2 phosphatase and scaffold CTD dephosphorylation at S5.

Conclusions:

  • RPRD1A and RPRD1B act as key adaptors linking RNAPII CTD phosphorylation status to dephosphorylation machinery.
  • Structural insights into CTD-CID complexes provide a foundation for understanding transcription regulation.
  • The findings reveal a novel mechanism for cross-talk between different CTD phosphorylation sites, impacting transcription and RNA processing.