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Protein Folding in the Endoplasmic Reticulum and the Unfolded Protein Response

  • Chapter
Molecular Chaperones in Health and Disease

Part of the book series: Handbook of Experimental Pharmacology ((HEP,volume 172))

Abstract

In all eukaryotic cells, the endoplasmic reticulum (ER) is an intracellular organelle where folding and assembly occurs for proteins destined to the extracellular space, plasma membrane, and the exo/endocytic compartments (Kaufman 1999). As a protein-folding compartment, the ER is exquisitely sensitive to alterations in homeostasis, and provides stringent quality control systems to ensure that only correctly folded proteins transit to the Golgi and unfolded or misfolded proteins are retained and ultimately degraded. A number of biochemical and physiological stimuli, such as perturbation in calcium homeostasis or redox status, elevated secretory protein synthesis, expression of misfolded proteins, sugar/glucose deprivation, altered glycosylation, and overloading of cholesterol can disrupt ER homeostasis, impose stress to the ER, and subsequently lead to accumulation of unfolded or misfoldedproteins in the ER lumen. The ER has evolved highly specific signaling pathways called the unfolded protein response UPR) to cope with the accumulation of unfolded or misfolded proteins. Elucidation of the molecular mechanisms by which accumulation of unfolded proteins in the ER transmits a signal to the cytoplasm and nucleus has led to major new insights into the diverse cellular and physiological processes that are regulated by the UPR. This chapter summarizes how cells respond to the accumulation of unfolded proteins in the cell and the relevance of these signaling pathways to human physiology and disease.

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  1. Howard Hughes Medical Institute, Department of Biological Chemistry, University of Michigan Medical Center, 1150W. Medical Center Dr., Ann Arbor, MI, 48109, USA

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  1. Freiburg i.

    K. Starke

  2. Medical School Hannover, Carl-Neuberg-Str. 1, 30625, Hannover, Germany

    Matthias Gaestel (Professor) (Professor)

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© 2006 Springer-Verlag Berlin Heidelberg

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Zhang, K., Kaufman, R. (2006). Protein Folding in the Endoplasmic Reticulum and the Unfolded Protein Response. In: Starke, K., Gaestel, M. (eds) Molecular Chaperones in Health and Disease. Handbook of Experimental Pharmacology, vol 172. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-29717-0_3

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