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1: Science. 2008 Jul 25;321(5888):569-72.Click here to read Links
Comment in:
Science. 2008 Jul 25;321(5888):499-500.

ERdj5 is required as a disulfide reductase for degradation of misfolded proteins in the ER.

Ushioda R, Hoseki J, Araki K, Jansen G, Thomas DY, Nagata K.

Department of Molecular and Cellular Biology, Institute for Frontier Medical Sciences, Kyoto University, Kyoto 606-8397, Japan.

Membrane and secretory proteins cotranslationally enter and are folded in the endoplasmic reticulum (ER). Misfolded or unassembled proteins are discarded by a process known as ER-associated degradation (ERAD), which involves their retrotranslocation into the cytosol. ERAD substrates frequently contain disulfide bonds that must be cleaved before their retrotranslocation. Here, we found that an ER-resident protein ERdj5 had a reductase activity, cleaved the disulfide bonds of misfolded proteins, and accelerated ERAD through its physical and functional associations with EDEM (ER degradation-enhancing alpha-mannosidase-like protein) and an ER-resident chaperone BiP. Thus, ERdj5 is a member of a supramolecular ERAD complex that recognizes and unfolds misfolded proteins for their efficient retrotranslocation.

PMID: 18653895 [PubMed - indexed for MEDLINE]