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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Dancy, Beverley M. Michaelis, Susan Maurer, Matthew J. Metzger, Meredith Boyle |
| Description | Author Affiliation: Metzger MB ( Department of Cell Biology, The Johns Hopkins University School of Medicine, Baltimore, Maryland 21205, USA.) |
| Abstract | Protein misfolding is monitored by a variety of cellular 'quality control' systems. Endoplasmic reticulum (ER) quality control handles misfolded secretory and membrane proteins and is well characterized. However, less is known about the quality control of misfolded cytosolic proteins (CytoQC). To study CytoQC, we have employed a genetic system in Saccharomyces cerevisiae using a transplantable degron, CL1 (1). Attachment of CL1 to the cytosolic protein Ura3p destabilizes Ura3p, targeting it for rapid proteasomal degradation. We have performed a comprehensive analysis of Ura3p-CL1 degradation requirements. As shown previously, we observe that the ER-localized ubiquitin E2 (Ubc6p, Ubc7p, and Cue1p) and E3 (Doa10p) machinery involved in ER-associated degradation (ERAD) are also responsible for the degradation of the cytosolic substrate Ura3p-CL1. Importantly, we find that the cytosol/ER membrane-localized chaperones Ydj1p and Ssa1p, known to be necessary for the ERAD of membrane proteins with misfolded cytosolic domains, are also required for the ubiquitination and degradation of Ura3p-CL1. In addition, we show a role for the Cdc48p-Npl4p-Ufd1p complex in the degradation of Ura3p-CL1. When ubiquitination is blocked, a portion of Ura3p-CL1 is ER membrane-localized. Furthermore, access to the cytosolic face of the ER is required for the degradation of CL1 degron-containing proteins. The ER is distributed throughout the cytosol, and our data, together with previous studies, suggest that the cytosolic face of the ER membrane serves as a 'platform' for the degradation of Ura3p-CL1, which may also be the case for other CytoQC substrates. |
| ISSN | 00219258 |
| e-ISSN | 1083351X |
| Journal | Journal of Biological Chemistry |
| Issue Number | 47 |
| Volume Number | 283 |
| Language | English |
| Publisher | American Society for Biochemistry and Molecular Biology (United States) |
| Publisher Date | 2008-11-21 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Cytosol Metabolism Endoplasmic Reticulum Fungal Proteins Physiology Gene Expression Regulation, Fungal Saccharomyces Cerevisiae Adenosine Triphosphatases Carrier Proteins HSP40 Heat-Shock Proteins HSP70 Heat-Shock Proteins Membrane Proteins Models, Biological Molecular Chaperones Plasmids Proteasome Endopeptidase Complex Saccharomyces Cerevisiae Proteins Solubility Ubiquitin-Conjugating Enzymes Research Support, N.I.H., Extramural Biochemistry Molecular Biology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Cell Biology Biochemistry Molecular Biology |
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