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SUMO Interacting Motifs: Structure and Function.

Tak-Yu Yau1, William Sander1, Christian Eidson1

  • 1Department of Chemistry & Biochemistry, University of California, Los Angeles, CA 90095, USA.

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|November 27, 2021
PubMed
Summary
This summary is machine-generated.

Small ubiquitin-related modifier (SUMO) proteins regulate cellular functions by interacting with SUMO-interacting motifs (SIMs). This interaction is crucial for processes like gene regulation and DNA repair.

Keywords:
DNA repairSUMOSUMO interacting motifhistoneshost–pathogen interactionsphase separationpost-translational protein modification

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Cell Biology

Background:

  • Small ubiquitin-related modifier (SUMO) is a key regulator of protein function.
  • SUMOylation involves covalent conjugation to lysine residues, altering protein activity.
  • SUMO-interacting motifs (SIMs) mediate crucial non-covalent interactions with SUMO.

Purpose of the Study:

  • To elucidate the structural and functional characteristics of SIM-SUMO interactions.
  • To understand how SUMOylation influences protein recruitment and cellular processes.
  • To explore the regulatory mechanisms of SIM/SUMO interactions, including phosphorylation.

Main Methods:

  • Structural analysis of SIM-SUMO binding interfaces.
  • Investigation of electrostatic and hydrophobic interactions.
  • Examination of phosphorylation-dependent regulation of SIM/SUMO binding.

Main Results:

  • SIMs feature a hydrophobic core flanked by charged residues, adopting a β-strand conformation.
  • SIMs bind to a conserved hydrophobic groove on SUMO, involving hydrophobic and electrostatic contacts.
  • Phosphorylation adjacent to SIMs enhances SUMO binding through additional electrostatic interactions.

Conclusions:

  • SIM/SUMO interactions are critical for diverse cellular functions, including phase separation, epigenetics, DNA repair, and host-pathogen interactions.
  • Understanding these interactions provides insights into fundamental cellular mechanisms.
  • The SUMO interactome's complexity highlights the need for further research into selective protein recruitment.