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Mutations in the tumor suppressor SPOP (speckle-type POZ protein) cause prostate, breast, and other solid tumors. SPOP is a substrate adaptor of the cullin3-RING ubiquitin ligase and localizes to nuclear speckles. Although cancer-associated mutations in SPOP interfere with substrate recruitment to the ligase, mechanisms underlying assembly of SPOP with its substrates in liquid nuclear bodies and effects of SPOP mutations on assembly are poorly understood. Here, we show that substrates trigger phase separation of SPOP in vitro and co-localization in membraneless organelles in cells. Enzymatic activity correlates with cellular co-localization and in vitro mesoscale assembly formation. Disease-associated SPOP mutations that lead to the accumulation of proto-oncogenic proteins interfere with phase separation and co-localization in membraneless organelles, suggesting that substrate-directed phase separation of this E3 ligase underlies the regulation of ubiquitin-dependent proteostasis.
Pubmed ID: 30244836 RIS Download
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