Abstract:
:Niemann-Pick type C disease is a fatal, progressive neurodegenerative disorder caused by loss-of-function mutations in NPC1, a multipass transmembrane glycoprotein essential for intracellular lipid trafficking. We sought to define the cellular machinery controlling degradation of the most common disease-causing mutant, I1061T NPC1. We show that this mutant is degraded, in part, by the proteasome following MARCH6-dependent ERAD. Unexpectedly, we demonstrate that I1061T NPC1 is also degraded by a recently described autophagic pathway called selective ER autophagy (ER-phagy). We establish the importance of ER-phagy both in vitro and in vivo, and identify I1061T as a misfolded endogenous substrate for this FAM134B-dependent process. Subcellular fractionation of I1061T Npc1 mouse tissues and analysis of human samples show alterations of key components of ER-phagy, including FAM134B. Our data establish that I1061T NPC1 is recognized in the ER and degraded by two different pathways that function in a complementary fashion to regulate protein turnover.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Schultz ML,Krus KL,Kaushik S,Dang D,Chopra R,Qi L,Shakkottai VG,Cuervo AM,Lieberman APdoi
10.1038/s41467-018-06115-2subject
Has Abstractpub_date
2018-09-10 00:00:00pages
3671issue
1issn
2041-1723pii
10.1038/s41467-018-06115-2journal_volume
9pub_type
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