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RING-Between-RING E3 Ligases: Emerging Themes amid the Variations.

Katja K Dove1, Rachel E Klevit1

  • 1Department of Biochemistry, University of Washington, Seattle, WA, United States.

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|August 23, 2017
PubMed
Summary
This summary is machine-generated.

RING-in-Between-RING (RBR) E3 ligases, crucial for protein regulation, utilize a unique mechanism involving RING and RING2 domains. This review highlights recent advancements in understanding RBR E3 Ub-transfer mechanisms and regulation.

Keywords:
RING-between-RING ubiquitin E3 ligasesprotein ubiquitylationubiquitin

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Area of Science:

  • Biochemistry and Molecular Biology
  • Cellular Regulation
  • Ubiquitination Pathways

Background:

  • Ubiquitin (Ub) modification regulates eukaryotic cellular processes via E1, E2, and E3 enzymes.
  • RING-in-Between-RING (RBR) E3 ligases are a distinct class characterized by a hybrid RING-HECT mechanism.
  • RBR E3s play vital roles in diverse cellular functions, despite being a small enzyme class.

Purpose of the Study:

  • To review recent developments in the field of RBR E3 ligases.
  • To focus on non-Parkin RBR E3s, including HOIP/HOIL-1L, HHARI, and TRIAD1.
  • To elucidate the Ub-transfer mechanism, structural aspects, and regulatory modes of RBR E3s.

Main Methods:

  • Literature review and synthesis of recent research findings.
  • Analysis of structural and mechanistic studies on RBR E3 ligases.
  • Comparative analysis of non-Parkin RBR E3 members.

Main Results:

  • Detailed insights into the RBR Ub-transfer mechanism, including the role of the RING1 domain and Ub-binding sites.
  • Structural comparisons among different RBR E3 ligase members.
  • Understanding of various auto-inhibition and activation mechanisms governing RBR E3 activity.

Conclusions:

  • RBR E3 ligases, particularly non-Parkin members, are critical regulators of cellular processes.
  • Recent advancements have significantly improved our understanding of RBR E3 mechanisms and regulation.
  • Further research into RBR E3s promises new insights into fundamental biology and potential therapeutic targets.