Jade1S SUMOylates tau and targets oligomers for degradation

Jade1S binds wild-type 0N4R tau via N-terminal and PHD zinc finger domains and SUMOylates it, enabling proteasome-dependent clearance of sarkosyl-insoluble tau oligomers.

• Why it matters: Tauopathy pathology involves insoluble tau aggregates, but how tau oligomerization and degradation are coordinated is not fully defined, despite GWAS links to JADE1.
• What they did: Using covalent labeling mass spectrometry and co-immunoprecipitation, the study maps Jade1S–0N4R tau binding sites and shows Jade1S acts as a SUMO E3 ligase that SUMOylates tau in vitro.
• The result: In cycloheximide chase assays, tau co-expression stabilizes Jade1S from less than an hour to ~17 hours, while Jade1S accelerates degradation of sarkosyl-insoluble tau oligomers and shifts SUMO2/3-modified oligomer clearance toward proteasomes.

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