SUMOylation regulates nuclear localization and stability of TRAIP/RNF206

Biochemical and Biophysical Research Communications
I Seul ParkHongtae Kim

Abstract

TRAIP/RNF206 plays diverse roles in cell cycle progression, DNA damage response, and DNA repair pathways. Physiological importance of TRAIP is highlighted by the identification of pathogenic mutations of TRAIP gene in patients diagnosed with primordial dwarfism. Although the diverse functions of TRAIP in the nucleus have been well characterized, molecular mechanism of TRAIP retention in the nucleus has not been determined. Here, we discovered that TRAIP is post-translationally modified by the small ubiquitin-like protein (SUMO). In addition, we identified five SUMOylation sites in TRAIP, and successfully generated SUMOylation deficient mutant of TRAIP. In an attempt to define the functional roles of TRAIP SUMOylation, we discovered that SUMOylation deficient TRAIP is not retained in the nucleus. In addition, protein stability of SUMOylation deficient TRAIP is lower than wild type TRAIP, demonstrating that SUMOylation is critical for both proper subcellular localization and protein stability of TRAIP. Taken together, these findings improve the understanding clinical implication of TRAIP in various diseases including primordial dwarfism and cancers.

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Citations

Jul 28, 2016·Cell Discovery·Wanjuan FengMichael Shing-Yan Huen
Apr 14, 2019·Life Science Alliance·Sara Priego MorenoAgnieszka Gambus
Aug 15, 2018·Proceedings of the National Academy of Sciences of the United States of America·Liwei AnMichael S Y Huen

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