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The mammalian unfolded protein response.
Martin Schröder1, Randal J Kaufman
1School of Biological and Biomedical Sciences, University of Durham, Durham DH1 3LE, United Kingdom. martin.schroeder@durham.ac.uk
Annual Review of Biochemistry
|June 15, 2005
Summary
The unfolded protein response (UPR) maintains endoplasmic reticulum (ER) homeostasis by regulating protein folding. UPR signaling also influences cellular processes like starvation and differentiation.
Area of Science:
- Cellular Biology
- Molecular Biology
- Biochemistry
Background:
- The endoplasmic reticulum (ER) is crucial for protein folding, modification, and transport.
- ER stress, caused by misfolded proteins, triggers adaptive signaling pathways.
- The unfolded protein response (UPR) is a key cellular defense mechanism against ER stress.
Purpose of the Study:
- To review the fundamental principles of protein folding and molecular chaperones.
- To elucidate the signal transduction mechanisms of the UPR in mammals.
- To explore the integration of UPR signaling with other cellular processes.
Main Methods:
- Review of existing literature on ER protein folding and UPR.
- Analysis of UPR signal transduction pathways.
- Synthesis of data on UPR's role in cellular decision-making.
Main Results:
- UPR activation restores ER homeostasis by modulating protein synthesis and degradation.
- UPR signaling involves complex signal transduction cascades.
- UPR influences diverse cellular processes beyond ER function.
Conclusions:
- Understanding UPR mechanisms is vital for comprehending cellular stress responses.
- UPR plays a significant role in integrating ER status with broader cellular functions.
- UPR signaling impacts eukaryotic starvation responses and differentiation.