alexa Degradation of misfolded proteins prevents ER-derived oxidative stress and cell death.
Bioinformatics & Systems Biology

Bioinformatics & Systems Biology

Journal of Health & Medical Informatics

Author(s): Haynes CM, Titus EA, Cooper AA

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Abstract A variety of debilitating diseases including diabetes, Alzheimer's, Huntington's, Parkinson's, and prion-based diseases are linked to stress within the endoplasmic reticulum (ER). Using S. cerevisiae, we sought to determine the relationship between protein misfolding, ER stress, and cell death. In the absence of ERV29, a stress-induced gene required for ER associated degradation (ERAD), misfolded proteins accumulate in the ER leading to persistent ER stress and subsequent cell death. Cells alleviate ER stress through the unfolded protein response (UPR); however, if stress is sustained the UPR contributes to cell death by causing the accumulation of reactive oxygen species (ROS). ROS are generated from two sources: the UPR-regulated oxidative folding machinery in the ER and mitochondria. Our results demonstrate a direct mechanism(s) by which misfolded proteins lead to cellular damage and death. Copyright 2004 Cell Press This article was published in Mol Cell and referenced in Journal of Health & Medical Informatics

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