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Localization of SUMO-modified Proteins Using Fluorescent Sumo-trapping Proteins
Published on: April 27, 2019
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SUMOylation is required for optimal TRAF3 signaling capacity
Sophia Miliara1, Kalliopi K Gkouskou, Tyson V Sharp
1Molecular and Cellular Biology Laboratory, University of Crete School of Medicine, Heraklion, Greece ; Laboratory of Cancer Biology, Institute of Molecular Biology and Biotechnology, Foundation of Research and Technology Hellas, Heraklion, Greece.
Plos One
|November 22, 2013
Summary
This study reveals that TRAF3, a key immune signaling protein, undergoes SUMOylation. This modification by Ubc9 impacts CD40 receptor association, influencing protein degradation and immune responses.
Area of Science:
- Immunology
- Molecular Biology
- Cell Signaling
Background:
- TNF receptor-associated factors (TRAFs) are crucial adaptor proteins coordinating immune signaling.
- TRAF3 plays a vital role in Toll-like and TNF receptor signaling pathways and lymphomagenesis suppression.
Purpose of the Study:
- To investigate post-translational modifications of TRAF3.
- To identify proteins interacting with TRAF3 and their functional consequences.
Main Methods:
- Yeast two-hybrid assays to identify interacting proteins.
- Co-immunoprecipitation assays to confirm protein interactions.
- Analysis of TRAF3 SUMOylation and its effect on CD40 receptor association and degradation.
Main Results:
- TRAF3 is post-translationally modified by small ubiquitin-related modifier (SUMO).
- Ubc9, the SUMO conjugating enzyme, was identified as a novel TRAF3-interacting protein.
- Ubc9-dependent SUMOylation of TRAF3 affects its association with the CD40 receptor, influencing TRAF3 degradation and non-canonical NF-κB activation.
Conclusions:
- This study describes a novel SUMOylation of a TRAF family member.
- SUMOylation is linked to TRAF-mediated signal transduction, specifically involving TRAF3 and CD40 signaling.
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