Yeast SREBP cleavage activation requires the Golgi Dsc E3 ligase complex
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Emerson V Stewart Christine C Nwosu Zongtian Tong Assen Roguev Timothy D Cummins Dong-Uk Kim Jacqueline Hayles Han-Oh Park Kwang-Lae Hoe David W Powell Nevan J Krogan Peter J EspenshadeAbstract
Mammalian lipid homeostasis requires proteolytic activation of membrane-bound sterol regulatory element binding protein (SREBP) transcription factors through sequential action of the Golgi Site-1 and Site-2 proteases. Here we report that while SREBP function is conserved in fungi, fission yeast employs a different mechanism for SREBP cleavage. Using genetics and biochemistry, we identified four genes defective for SREBP cleavage, dsc1-4, encoding components of a transmembrane Golgi E3 ligase complex with structural homology to the Hrd1 E3 ligase complex involved in endoplasmic reticulum-associated degradation. The Dsc complex binds SREBP and cleavage requires components of the ubiquitin-proteasome pathway: the E2-conjugating enzyme Ubc4, the Dsc1 RING E3 ligase, and the proteasome. dsc mutants display conserved aggravating genetic interactions with components of the multivesicular body pathway in fission yeast and budding yeast, which lacks SREBP. Together, these data suggest that the Golgi Dsc E3 ligase complex functions in a post-ER pathway for protein degradation.
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Publisher website (DOI) 10.1016/j.molcel.2011.02.035
Europe PubMed Central 21504829
Pubmed 21504829
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