The yeast ERAD-C ubiquitin ligase Doa10 recognizes an intramembrane degron.

The yeast ERAD-C ubiquitin ligase Doa10 recognizes an intramembrane degron.
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DOI:
10.1083/jcb.201408088
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发表时间:
2015-04-27
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Kreft SG
Kreft SG
中科院分区:
其他
文献类型:
--
作者:
Habeck G;Ebner FA;Shimada-Kreft H;Kreft SG

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In Saccharomyces cerevisiae, surprisingly, the transmembrane protein Sbh2, which harbors an intramembrane degron, is a substrate of the ubiquitin-protein ligase Doa10. Aberrant endoplasmic reticulum (ER) proteins are eliminated by ER-associated degradation (ERAD). This process involves protein retrotranslocation into the cytosol, ubiquitylation, and proteasomal degradation. ERAD substrates are classified into three categories based on the location of their degradation signal/degron: ERAD-L (lumen), ERAD-M (membrane), and ERAD-C (cytosol) substrates. In Saccharomyces cerevisiae, the membrane proteins Hrd1 and Doa10 are the predominant ERAD ubiquitin-protein ligases (E3s). The current notion is that ERAD-L and ERAD-M substrates are exclusively handled by Hrd1, whereas ERAD-C substrates are recognized by Doa10. In this paper, we identify the transmembrane (TM) protein Sec61 β-subunit homologue 2 (Sbh2) as a Doa10 substrate. Sbh2 is part of the trimeric Ssh1 complex involved in protein translocation. Unassembled Sbh2 is rapidly degraded in a Doa10-dependent manner. Intriguingly, the degron maps to the Sbh2 TM region. Thus, in contrast to the prevailing view, Doa10 (and presumably its human orthologue) has the capacity for recognizing intramembrane degrons, expanding its spectrum of substrates.
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