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Negative Feedback Loop Mechanism between EAF1/2 and DBC1 in Regulating ELL Stability and Functions.

Subham Basu1, Arijit Nandy1, Mahesh K Barad1

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Summary

ELL-associated factors 1 and 2 (EAF1/2) regulate ELL protein stability in vivo. They compete with HDAC3 and DBC1, forming feedback loops that maintain ELL levels for gene expression, with context-dependent pathway preference.

Keywords:
DBC1EAF1ELLHDAC3TRIM28super elongation complextranscriptional regulationubiquitylation

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Area of Science:

  • Molecular Biology
  • Gene Regulation
  • Protein Stability

Background:

  • ELL-associated factors 1 and 2 (EAF1/2) enhance transcription in vitro, but in vivo roles are unclear.
  • ELL protein's role in transcription is critical but its regulation is not fully understood.

Purpose of the Study:

  • To elucidate the in vivo functions of EAF1/2 in regulating ELL protein stability.
  • To investigate the interplay between EAF1/2, HDAC3, and DBC1 in maintaining ELL levels.
  • To understand the context-dependent mechanisms controlling ELL protein homeostasis.

Main Methods:

  • Investigated protein-protein interactions using competitive binding assays.
  • Analyzed protein stability via acetylation and ubiquitylation assays.
  • Utilized knockdown and expression studies to probe feedback loop mechanisms.
  • Examined cellular responses to genotoxic stress and growth factors.

Main Results:

  • EAF1/2 regulate ELL stability by competing with HDAC3, affecting acetylation and degradation.
  • Negative feedback loops between DBC1 and EAF1/2 maintain overall ELL levels.
  • TRIM28 mediates DBC1-induced EAF1/2 ubiquitylation and degradation.
  • Mammalian cells employ EAF1-dependent pathways under genotoxic stress and DBC1-dependent pathways with growth factors.

Conclusions:

  • EAF1/2, HDAC3, DBC1, and TRIM28 coordinate to regulate ELL protein levels for optimal gene expression.
  • Negative feedback mechanisms involving EAF1/2 and DBC1 are crucial for ELL homeostasis.
  • Mammalian cells exhibit distinct, context-dependent pathways for ELL maintenance.