The E3 Ubiquitin Ligase gp78 Protects against ER Stress in Zebrafish Liver

Zhiliang Chen; Petek Ballar; Yu Fu; Jia Luo; Shaojun Du; Shengyun Fang

doi:10.1016/j.jgg.2014.05.005

Volume 41 Issue 7

Jul. 2014

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Abstract

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Article Navigation > Journal of Genetics and Genomics > 2014 > 41(7): 357-368

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The E3 Ubiquitin Ligase gp78 Protects against ER Stress in Zebrafish Liver

doi: 10.1016/j.jgg.2014.05.005

a
Center for Biomedical Engineering and Technology, Baltimore, MD 21202, USA
b
Department of Physiology, University of Maryland School of Medicine, Baltimore, MD 21201, USA
c
Faculty of Pharmacy, Biochemistry Department, Ege University, Izmir 35100, Turkey
d
Biopharmaceutical Research Institute, Anhui Medical University, Hefei 230032, China
e
Department of Internal Medicine, University of Kentucky College of Medicine, Lexington, KY 40536, USA
f
Department of Biochemistry and Molecular Biology, University of Maryland School of Medicine, Baltimore, MD 21202, USA

More Information

Corresponding author: E-mail address: sdu@som.umaryland.edu (Shaojun Du); E-mail address: sfang@umaryland.edu (Shengyun Fang)
Received Date: 2014-04-22
Accepted Date: 2014-05-04
Rev Recd Date: 2014-05-03

Available Online: 2014-06-01

Publish Date: 2014-07-20

Abstract

Abstract

Enhanced endoplasmic reticulum (ER)-associated protein degradation (ERAD) activity by the unfolded protein response (UPR) represents one of the mechanisms for restoring ER homeostasis. In vitro evidence indicates that the mammalian gp78 protein is an E3 ubiquitin ligase that facilitates ERAD by polyubiquitinating and targeting proteins for proteasomal degradation under both physiologic and stress conditions. However, the in vivo function of gp78 in maintaining ER protein homeostasis remains untested. Here we show that like its mammalian counterpart, the zebrafish gp78 is also an E3 ubiquitin ligase as revealed by in vitro ubiquitination assays. Expression analysis uncovered that gp78 is highly expressed in several organs, including liver and brain, of both larval and adult fish. Treatment of larvae or adult fish with tunicamycin induces ER stress and upregulates the expression of several key components of the gp78 ERAD complex in the liver. Moreover, liver-specific overexpression of the dominant-negative form of gp78 (gp78-R2M) renders liver more sensitive to tunicamycin-induced ER stress and enhances the expression of sterol response element binding protein (Srebp)-target genes, which was largely suppressed in fish overexpressing wild-type gp78. Together, these data indicate that gp78 plays a critical role in protecting against ER stress in liver.
- Zebrafish,
- gp78/AMFR,
- UPR,
- Lipogenesis,
- Cholesterol,
- ERAD

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References(49)

References

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