Abstract:
:In the endoplasmic reticulum (ER), misfolded and unfolded proteins are eliminated by a process called ER-associated protein degradation (ERAD) in order to maintain cell homeostasis. In the ERAD pathway, several ER-localized E3 ubiquitin ligases target ERAD substrate proteins for ubiquitination and subsequent proteasomal degradation. However, little is known about how the functions of the ERAD ubiquitin ligases are regulated. Recently, USP19, an ER-anchored deubiquitinating enzyme (DUB), has been suggested to be involved in the regulation of ERAD. In this study, HRD1, an ERAD ubiquitin ligase, is shown to be a novel substrate for USP19. We demonstrate that USP19 rescues HRD1 from proteasomal degradation by deubiquitination of K48-linked ubiquitin chains. In addition, the altered expression of USP19 affects the steady-state levels of HRD1. These results suggest that USP19 regulates the stability of HRD1 and provide insight into the regulatory mechanism of the ERAD ubiquitin ligases.
journal_name
Int J Mol Scijournal_title
International journal of molecular sciencesauthors
Harada K,Kato M,Nakamura Ndoi
10.3390/ijms17111829subject
Has Abstractpub_date
2016-11-02 00:00:00issue
11issn
1422-0067pii
ijms17111829journal_volume
17pub_type
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