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Protein folding in a specialized compartment: the endoplasmic reticulum
A Zapun1, C A Jakob, D Y Thomas
1Department of Anatomy and Cell Biology, McGill University, Montreal, Quebec, Canada.
Structure (London, England : 1993)
|September 1, 1999
Summary
This review covers endoplasmic reticulum folding mediators and proposes updated models for protein quality control in the secretory pathway.
Area of Science:
- Cell Biology
- Molecular Biology
- Biochemistry
Background:
- The endoplasmic reticulum (ER) is crucial for synthesizing and folding proteins destined for secretion or insertion into membranes.
- Misfolded proteins in the ER can trigger cellular stress responses, impacting cell function and viability.
Purpose of the Study:
- To review the diverse classes of folding mediators within the ER secretory pathway.
- To discuss their specific functions in assisting protein folding.
- To propose refined models of the ER protein quality control system.
Main Methods:
- Literature review of existing research on ER folding mediators.
- Analysis and synthesis of functional data for different classes of folding mediators.
- Conceptual modeling of the ER quality control system based on current evidence.
Main Results:
- Identification and categorization of key folding mediators, including chaperones and foldases.
- Elucidation of the distinct roles these mediators play in various stages of protein folding.
- Presentation of updated models illustrating the dynamic nature of ER quality control.
Conclusions:
- Folding mediators are essential for maintaining ER homeostasis and ensuring protein biogenesis.
- The ER quality control system is a complex, multi-layered network that actively manages protein folding.
- Further research into these mediators and control systems could reveal therapeutic targets for protein misfolding diseases.