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Journal articles
Arkadia, a Novel SUMO-Targeted Ubiquitin Ligase Involved in PML Degradation
Abstract : Arkadia is a RING domain E3 ubiquitin ligase that activates the transforming growth factor β (TGF-β) pathway by inducing degradation of the inhibitor SnoN/Ski. Here we show that Arkadia contains three successive SUMO-interacting motifs (SIMs) that mediate noncovalent interaction with poly-SUMO2. We identify the third SIM (VVDL) of Arkadia to be the most relevant one in this interaction. Furthermore, we provide evidence that Arkadia can function as a SUMO-targeted ubiquitin ligase (STUBL) by ubiquitinating SUMO chains. While the SIMs of Arkadia are not essential for SnoN/Ski degradation in response to TGF-β, we show that they are necessary for the interaction of Arkadia with polysumoylated PML in response to arsenic and its concomitant accumulation into PML nuclear bodies. Moreover, Arkadia depletion leads to accumulation of polysumoylated PML in response to arsenic, highlighting a requirement of Arkadia for arsenic-induced degradation of polysumoylated PML. Interestingly, Arkadia homodimerizes but does not heterodimerize with RNF4, the other STUBL involved in PML degradation, suggesting that these two E3 ligases do not act synergistically but most probably act independently during this process. Altogether, these results identify Arkadia to be a novel STUBL that can trigger degradation of signal-induced polysumoylated proteins.
https://hal-pasteur.archives-ouvertes.fr/pasteur-03236062
Contributor : Samia Cheriet Rauline Connect in order to contact the contributor
Submitted on : Wednesday, May 26, 2021 - 10:15:19 AM
Last modification on : Tuesday, October 19, 2021 - 10:28:46 PM
Contributor : Samia Cheriet Rauline Connect in order to contact the contributor
Submitted on : Wednesday, May 26, 2021 - 10:15:19 AM
Last modification on : Tuesday, October 19, 2021 - 10:28:46 PM
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