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Protein Assemblies in Translesion Synthesis.

Gianluca A Arianna1, Dmitry M Korzhnev1

  • 1Department of Molecular Biology and Biophysics, University of Connecticut Health Center, Farmington, CT 06030, USA.

Genes
|July 27, 2024
PubMed
Summary
This summary is machine-generated.

Translesion synthesis (TLS) uses specialized polymerases to replicate DNA across damage, preserving genetic integrity via mutations. Recent Cryo-EM studies reveal how these DNA repair enzymes cooperate in TLS holoenzyme assemblies.

Keywords:
DNA damage toleranceDNA repairprotein assembliesprotein structureprotein–protein interactionstranslesion synthesis

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Translesion synthesis (TLS) is a critical DNA damage tolerance mechanism in eukaryotes.
  • Specialized DNA polymerases (e.g., Y-family, Polζ) bypass DNA lesions, enabling replication to proceed.
  • TLS polymerases assemble on the PCNA sliding clamp, forming a TLS mutasome complex.

Purpose of the Study:

  • To review structural studies of TLS polymerases.
  • To elucidate the cooperative mechanisms of TLS holoenzyme assemblies.
  • To highlight insights from recent high-resolution Cryo-Electron Microscopy (Cryo-EM) studies.

Main Methods:

  • Review of existing structural studies on TLS polymerases.
  • Analysis of protein-protein interactions (PPIs) within TLS complexes.
  • Integration of data from high-resolution Cryo-EM studies of holoenzyme assemblies.

Main Results:

  • Individual TLS polymerase structures and lesion bypass mechanisms are well-characterized.
  • The cooperative assembly and function of TLS holoenzymes were previously elusive.
  • Recent Cryo-EM studies provide unprecedented structural insights into TLS holoenzyme action.

Conclusions:

  • Understanding TLS holoenzyme assembly is key to comprehending DNA damage tolerance.
  • Cryo-EM has revolutionized the study of complex molecular machines like the TLS mutasome.
  • This review consolidates structural knowledge, paving the way for future research into TLS mechanisms.