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• W2971567008 endingPage "2577" @default.
• W2971567008 startingPage "2561" @default.
• W2971567008 abstract "Abstract Misfolded proteins in the endoplasmic reticulum (ER) are removed through multistep processes termed ER-associated degradation (ERAD). Valosin-containing protein (VCP) plays a crucial role in ERAD as the interaction of ubiquitin fusion degradation protein 1 (Ufd1) with VCP via its SHP box motif (228F-S-G-S-G-N-R-L235) is required for ERAD. However, the mechanisms by which the VCP–Ufd1 interaction is regulated are not well understood. Here, we found that the serine 229 residue located in the Ufd1 SHP box is phosphorylated in vitro and in vivo by cyclic adenosine monophosphate-dependent protein kinase A (PKA), with this process being enhanced by either forskolin (an adenylyl cyclase activator) or calyculin A (a protein phosphatase inhibitor). Moreover, a phosphomimetic mutant (S229D) of Ufd1 as well as treatment by forskolin, calyculin A, or activated PKA strongly reduced Ufd1 binding affinity for VCP. Consistent with this, the Ufd1 S229D mutant significantly inhibited ERAD leading to the accumulation of ERAD substrates such as a tyrosinase mutant (C89R) and 3-hydroxy-3-methylglutaryl coenzyme A reductase. However, a non-phosphorylatable Ufd1 mutant (S229A) retained VCP-binding ability and was less effective in blocking ERAD. Collectively, our results support that Ufd1 S229 phosphorylation status mediated by PKA serves as a key regulatory point for the VCP–Ufd1 interaction and functional ERAD." @default.
• W2971567008 created "2019-09-12" @default.
• W2971567008 creator A5009239994 @default.
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• W2971567008 creator A5069553941 @default.
• W2971567008 date "2019-09-20" @default.
• W2971567008 modified "2023-10-16" @default.
• W2971567008 title "Ufd1 phosphorylation at serine 229 negatively regulates endoplasmic reticulum-associated degradation by inhibiting the interaction of Ufd1 with VCP" @default.
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• W2971567008 doi "https://doi.org/10.1042/bcj20190254" @default.
• W2971567008 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/31477623" @default.
• W2971567008 hasPublicationYear "2019" @default.
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