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Related Experiment Videos

Endoplasmic reticulum-associated degradation.

Karin Römisch1

  • 1University of Cambridge, Cambridge Institute for Medical Research, Hills Road, Cambridge CB2 2XY, United Kingdom. kbr20@cam.ac.uk

Annual Review of Cell and Developmental Biology
|October 11, 2005
PubMed
Summary

Misfolded proteins in the endoplasmic reticulum are exported to the cytosol for degradation via the Sec61 channel, a process potentially powered by AAA-ATPases.

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Area of Science:

  • Cell Biology
  • Protein Folding and Degradation
  • Endoplasmic Reticulum Function

Background:

  • Secretory and transmembrane proteins utilize the Sec61 channel to enter the endoplasmic reticulum (ER).
  • Within the ER, proteins undergo folding, modification, and oligomerization before transport to the Golgi complex.
  • Misfolded proteins are targeted for degradation in the cytosol via proteasomes.

Purpose of the Study:

  • To elucidate the mechanism of misfolded protein export from the ER to the cytosol.
  • To identify the protein-conducting channel involved in retrograde transport of misfolded proteins.
  • To investigate the energy sources powering the export of misfolded proteins.

Main Methods:

  • Analysis of protein translocation pathways.
  • Investigation of protein targeting to degradation machinery.
  • Study of chaperone involvement in protein export.

Main Results:

  • Misfolded proteins are selectively transported from the ER lumen or membrane back to the cytosol.
  • The Sec61 channel is implicated as the export channel for misfolded proteins.
  • AAA-ATPases, including the proteasome 19S regulatory particle and Cdc48p/p97, may power protein export.
  • Ubiquitylation often precedes the degradation of exported proteins.

Conclusions:

  • The Sec61 channel plays a crucial role in the endoplasmic reticulum-associated degradation (ERAD) pathway.
  • Retrograde protein transport from the ER is an active process potentially driven by AAA-ATPases.
  • Chaperones guide misfolded proteins to the degradation machinery based on their topological defect.

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