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End-Binding E3 Ubiquitin Ligases Enable Protease Signaling.

Matthew Ravalin1, Koli Basu1, Jason E Gestwicki1,2

  • 1Department of Pharmaceutical Chemistry, University of California at San Francisco, San Francisco, California 94143, United States.

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Proteolysis, an irreversible modification, creates new protein termini that recruit E3 ubiquitin ligases. These interactions regulate proteolytic signaling duration and magnitude, linking proteolysis to protein homeostasis.

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Cell Biology

Background:

  • Post-translational modifications (PTMs) regulate protein complex assembly.
  • Proteolysis, an irreversible PTM, cleaves peptide bonds, generating new N and C termini.
  • These new termini can alter protein-protein interactions (PPIs) by recruiting end-binding proteins.

Purpose of the Study:

  • To review the role of proteolysis in forming protein complexes by recruiting E3 ubiquitin ligases to new termini.
  • To discuss how these complexes modulate proteolytic signaling and protein homeostasis (proteostasis).

Main Methods:

  • Review of existing literature on proteolysis, E3 ubiquitin ligases, and protein degradation pathways.
  • Focus on N-degron and C-degron pathways involving nascent termini.
  • Discussion of the interplay between proteolytic signaling and proteostasis.

Main Results:

  • Proteolysis generates new termini that serve as binding sites for E3 ubiquitin ligases.
  • Recruitment of E3 ligases to these termini forms complexes that regulate proteolytic signaling.
  • These mechanisms, involving N-degron and C-degron pathways, link proteolysis to proteostasis.

Conclusions:

  • Proteolysis-mediated recruitment of E3 ubiquitin ligases fine-tunes proteolytic signaling.
  • These pathways integrate protease signaling with the maintenance of protein homeostasis.
  • Understanding these mechanisms is crucial for comprehending cellular regulation and disease.