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RNA Polymerase II Accessory Proteins02:36

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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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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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Updated: Oct 30, 2025

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Removing quote marks from the RNA polymerase II CTD 'code'.

Giorgio Dieci1

  • 1Department of Chemistry, Life Sciences and Environmental Sustainability, University of Parma, Parco Area delle Scienze 23/A, 43124, Parma, Italy.

Bio Systems
|July 3, 2021
PubMed
Summary
This summary is machine-generated.

The RNA polymerase II C-terminal domain (CTD) functions as a true organic code, with its modifications directing RNA biogenesis. This CTD code integrates with other biological codes, influencing gene expression and development.

Keywords:
CTD codeChromatinHistone codeIntrinsically disordered regionsLiquid-liquid phase separationProtein tandem repeatsRNA polymerase IISplicing codeTranscription

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Genetics

Background:

  • RNA polymerase II (Pol II) synthesizes all eukaryotic mRNAs and non-coding RNAs.
  • Pol II's C-terminal domain (CTD) is key for coordinating transcription with RNA processing and chromatin modification.
  • The CTD consists of repeated YSPTSPS heptapeptides, with post-translational modifications creating diverse functional states.

Purpose of the Study:

  • To argue that the Pol II CTD modification system constitutes a true organic code.
  • To explore how CTD modifications act as signs with biological meanings in RNA biogenesis.
  • To discuss the integration of the CTD code with other biological codes.

Main Methods:

  • Theoretical framework of code biology applied to CTD modifications.
  • Analysis of adaptor proteins that recognize CTD modification profiles.
  • Consideration of experimental evidence, including domain interchange experiments.
  • Review of recent discoveries in CTD research.

Main Results:

  • The Pol II CTD modification system meets the criteria of a bona fide organic code.
  • CTD modification states are recognized by adaptor proteins, mediating biological reactions.
  • The CTD code is experimentally mutable, supporting its arbitrary nature.
  • The CTD code integrates with the splicing code and histone code.

Conclusions:

  • The Pol II CTD functions as a critical organic code governing RNA biogenesis.
  • This code is intertwined with other cellular regulatory mechanisms.
  • Recent findings highlight the CTD's evolutionary expansion and role in developmental complexity.