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Nitrogen Cavitation and Differential Centrifugation Allows for Monitoring the Distribution of Peripheral Membrane Proteins in Cultured Cells
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Published on: August 18, 2017

Protein quality control at the plasma membrane.

Tsukasa Okiyoneda1, Pirjo M Apaja, Gergely L Lukacs

  • 1Department of Physiology and Groupe de Recherche Axé sur la Structure des Protéines, McGill University, Montréal, Quebec H3G 1Y6, Canada.

Current Opinion in Cell Biology
|May 17, 2011
PubMed
Summary

Cellular proteostasis relies on proper protein folding and disposal. This study explores peripheral quality control mechanisms for cell surface proteins, revealing similarities and differences with endoplasmic reticulum processes.

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Area of Science:

  • Cellular biology
  • Molecular biology
  • Biochemistry

Background:

  • Cellular proteostasis is vital for cell function, especially for membrane proteins.
  • Damaged proteins must be correctly folded or degraded to maintain cellular homeostasis.
  • The cell surface and endocytic pathways are critical sites for protein quality control.

Purpose of the Study:

  • To investigate peripheral quality control (QC) mechanisms for membrane proteins.
  • To compare the plasma membrane (PM) QC machinery with the endoplasmic reticulum (ER) QC system.
  • To explore the role of peripheral QC in conformational diseases.

Main Methods:

  • Analysis of protein ubiquitination and lysosomal degradation pathways.
  • Identification of recognition and effector components in PM QC.
  • Comparative analysis of PM and ER QC machinery.

Main Results:

  • Peripheral QC mechanisms operate along the late secretory and endocytic pathways and at the PM.
  • Components of PM QC show similarities and differences to ER QC machinery.
  • Ubiquitination and lysosomal degradation are key effectors in PM QC.

Conclusions:

  • Peripheral QC plays a significant role in managing conformationally damaged membrane proteins.
  • Understanding PM QC offers insights into disease mechanisms and potential therapeutic targets.
  • The study highlights the complexity and adaptability of cellular protein quality control systems.