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A prelude to the proximity interaction mapping of CXXC5

Gamze Ayaz1,2, Gizem Turan3, Çağla Ece Olgun3

  • 1Department of Biological Sciences, Middle East Technical University, 06800, Ankara, Turkey. gamze.ayazsen@nih.gov.

Scientific Reports
|September 3, 2021
PubMed

Insights

CXXC5 protein binds DNA and interacts with other proteins to regulate gene expression. This study identifies key interaction partners, like MeCP2, revealing CXXC5

Area of Science:

  • Molecular Biology
  • Epigenetics
  • Gene Regulation

Background:

  • CXXC5 is a DNA-binding protein in the zinc-finger CXXC family, implicated in gene expression modulation.
  • The precise mechanisms by which CXXC5 influences gene expression remain largely unknown.
  • Proteins function in dynamic networks, suggesting CXXC5 may act as a scaffold for regulatory complexes.

Purpose of the Study:

  • To elucidate the molecular mechanisms underlying CXXC5-mediated gene expression.
  • To identify CXXC5 interaction partners involved in its regulatory functions.
  • To understand CXXC5's role in establishing chromatin states for transcription.

Main Methods:

  • Employed proximity-dependent biotinylation to identify CXXC5 interaction partners.
  • Investigated interactions between CXXC5 and identified proteins using molecular assays.
  • Assessed the functional significance of CXXC5-protein interplay on target gene expression.

Main Results:

  • Identified DNA and chromatin modifiers, transcription factors, and RNA processors as CXXC5 proximity interactors.
  • CXXC5 directly interacts with EMD, MAZ, and MeCP2 via its CXXC domain.
  • The interaction between CXXC5 and MeCP2 is crucial for the expression of a subset of CXXC5 target genes.

Conclusions:

  • CXXC5 functions as a scaffold protein, potentially acting as a nucleation factor in gene expression modulation.
  • The interplay between CXXC5 and MeCP2 is a key mechanism in regulating specific gene expressions.
  • Findings provide insights into CXXC5's role in cellular processes and disease pathophysiology.

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