Role of Sec61p in the ER-associated degradation of short-lived transmembrane proteins

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Abstract

Misfolded proteins in the endoplasmic reticulum (ER) are identified and degraded by the ER-associated degradation pathway (ERAD), a com ponent of ER quality control. In ERAD, misfolded proteins are removed from the ER by retrotranslocation into the cytosol where they are degraded by the ubiquitin-proteasome system. The identity of the specific protein components responsible for retrotranslocation remains controversial, with the potential candidates being Sec61p, Der1p, and Doa10. We show that the cytoplasmic N-terminal domain of a short-lived transmembrane ERAD substrate is exposed to the lumen of the ER during the degradation process. The addition of N-linked glycan to the N terminus of the substrate is prevented by mutation of a specific cysteine residue of Sec61p, as well as a specific cysteine residue of the substrate protein. We show that the substrate protein forms a disulfide-linked complex to Sec61p, suggesting that at least part of the retrotranslocation process involves Sec61p. © 2008 Scott and Schekman. The Rockefeller University Press.

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Scott, D. C., & Schekman, R. (2008). Role of Sec61p in the ER-associated degradation of short-lived transmembrane proteins. Journal of Cell Biology, 181(7), 1095–1105. https://doi.org/10.1083/jcb.200804053

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