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Updated: Oct 11, 2025

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SUMO-SIM interactions: From structure to biological functions.

Jara Lascorz1, Joan Codina-Fabra2, David Reverter1

  • 1Institut de Biotecnologia i de Biomedicina (IBB) and Dept. de Bioquímica i Biologia Molecular, Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain.

Seminars in Cell & Developmental Biology
|November 29, 2021
PubMed
Summary

Small Ubiquitin-like Modifier (SUMO) interactions with SUMO-interacting motifs (SIMs) are crucial for regulating cellular processes. These interactions mediate SUMOylation reactions and influence the modification

Keywords:
E3 ligaseSUMOSUMO interacting motifprotein-protein interactionubiquitin

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Background:

  • Post-translational modification by Small Ubiquitin-like Modifier (SUMO) proteins regulates diverse cellular functions.
  • SUMOylation involves the attachment of SUMO to target proteins via a cascade of enzymes (E1, E2, E3).
  • SUMO functions often rely on non-covalent interactions between SUMOylated substrates and binding partners.

Purpose of the Study:

  • To analyze the role of SUMO-SIM contacts in SUMOylation enzymes and targets.
  • To discuss the participation of SUMO-SIM interactions in SUMOylation reactions.
  • To elucidate how SUMO-SIM interactions mediate the outcomes of SUMOylation.

Main Methods:

  • Analysis of SUMO-SIM contacts in SUMO enzymes.
  • Examination of SUMO-SIM interactions in SUMOylated targets.
  • Literature review and discussion of existing data on SUMO-SIM interactions.

Main Results:

  • SUMO-SIM interactions are mediated by a conserved SUMO surface and a SIM in the interactor protein.
  • Despite weak individual binding, SUMO-SIM interactions significantly impact protein activity, localization, and stability.
  • These interactions are essential for SUMO conjugation and deconjugation processes.
  • SUMO-SIM interactions are critical for forming macromolecular assemblies and inducing phase separation.

Conclusions:

  • SUMO-SIM interactions are fundamental to the SUMOylation pathway.
  • These interactions play a vital role in regulating the functional consequences of SUMOylation.
  • Understanding SUMO-SIM contacts provides insights into cellular regulation and disease mechanisms.