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Related Experiment Video

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RNF4 interacts with multiSUMOylated ETV4.

Elisa Aguilar-Martinez1, Baoqiang Guo1, Andrew D Sharrocks1

  • 1Faculty of Biology, Medicine and Health, University of Manchester, Manchester, M13 9PT, UK.

Wellcome Open Research
|June 15, 2017
PubMed
Summary

The ubiquitin ligase RNF4 binds to SUMOylated proteins. This study shows RNF4 recognizes multi-SUMOylated ETV4 via specific SUMO interaction motifs (SIMs), expanding understanding of protein regulation.

Keywords:
ETV4RNF4SIMSUMO

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Area of Science:

  • Molecular Biology
  • Post-translational Modifications
  • Ubiquitin-Proteasome System

Background:

  • Protein SUMOylation is a key regulatory mechanism influencing protein activity.
  • PolySUMO chains recruit the ubiquitin ligase RNF4 to substrates for degradation.
  • RNF4 utilizes multiple SUMO interaction motifs (SIMs) to bind polySUMO chains.

Purpose of the Study:

  • To investigate if multi-SUMOylated proteins, beyond polySUMO chains, can recruit RNF4.
  • To determine the mechanism by which RNF4 interacts with multi-SUMOylated substrates like ETV4.
  • To identify the specific SIMs involved in RNF4's interaction with multi-SUMOylated platforms.

Main Methods:

  • Biochemical assays to test the binding of RNF4 to multi-SUMOylated ETV4.
  • Mutational analysis of RNF4's SIMs to identify critical interaction sites.
  • Investigating the role of SUMOylation sites on ETV4 in RNF4 recruitment.

Main Results:

  • Multi-SUMOylated ETV4 directly binds to the ubiquitin ligase RNF4.
  • A specific subset of RNF4's SIMs is essential for interacting with the multi-SUMOylated ETV4 platform.
  • RNF4's ability to bind multi-SUMOylated proteins is demonstrated, distinct from polySUMO chain recognition.

Conclusions:

  • RNF4 can recognize and bind to proteins modified by SUMOylation on multiple sites (multi-SUMOylation).
  • This interaction requires a unique combination of SIMs within RNF4, highlighting specificity.
  • The findings suggest that multi-SIM/multi-SUMO interactions represent a potentially widespread mechanism for protein regulation and recruitment.