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Structural basis of generic versus specific E2-RING E3 interactions in protein ubiquitination.

Mehmet Gundogdu1, Helen Walden1

  • 1Institute of Molecular, Cell and Systems Biology, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow, UK.

Protein Science : a Publication of the Protein Society
|July 25, 2019
PubMed
Summary

Protein ubiquitination is crucial for cell biology. This review explores how specific enzyme pairs (E2-E3) achieve precise protein targeting, revealing emerging structural mechanisms for specificity.

Keywords:
E2E2-E3 specificityRING E3structural basis of specificityubiquitination

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biochemistry

Background:

  • Protein ubiquitination is a key regulatory process in eukaryotic cells.
  • Ubiquitin-activating (E1), conjugating (E2), and ligating (E3) enzymes form a cascade to modify proteins.
  • E2 enzymes dictate the type of ubiquitin signal, while E3 enzymes select the target protein.

Purpose of the Study:

  • To review the structural basis of E2-RING E3 interactions.
  • To highlight emerging themes explaining specificity in E2-E3 complex formation.
  • To understand how over 600 E3 enzymes discriminate among 38 E2 enzymes.

Main Methods:

  • Structural analysis of E2-E3 complexes.
  • Review of existing literature on protein ubiquitination.
  • Comparative analysis of E2-E3 interaction interfaces.

Main Results:

  • General principles of E2-RING E3 interactions are established.
  • Emerging structural themes explain how E3s achieve specificity for E2s.
  • Over 50 E2-E3 complex structures provide insights into discrimination mechanisms.

Conclusions:

  • Specificity in protein ubiquitination relies on precise E2-E3 enzyme pairing.
  • Structural studies are crucial for deciphering the mechanisms of E2-E3 recognition.
  • Understanding these interactions is fundamental to eukaryotic cell regulation.