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Biological membranes are more than just a barrier separating cell cytoplasm from the outside environment. They are highly dynamic and help maintain the integrity and physiological stability of the cells as well as membrane-bound organelles. Membranes also play vital roles in cell-to-cell and intracellular communication.
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After folding, the ER assesses the quality of secretory and membrane proteins. The correctly folded proteins are cleared by the calnexin cycle for transport to their final destination, while misfolded proteins are held back in the ER lumen. The ER chaperones attempt to unfold and refold the misfolded proteins but sometimes fail to achieve the correct native conformation. Such terminally misfolded proteins are then exported to the cytosol by ER-associated degradation or ERAD pathway for...
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The endoplasmic reticulum or ER makes up for more than half of the membranes in a cell and accounts for 10% of total cell volume. It is also the primary protein and lipid synthesis factory for most cell organelles, such as the Golgi apparatus, lysosomes, secretory vesicles, and the plasma membrane. Despite being the most extensive and functionally complex subcellular organelle, ER was the last to be discovered. After years of deliberation, Keith Porter and George Palade in the year 1954,...
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Eukaryotic cells have a special pathway that enables communication between various intracellular membrane-bound compartments and also with the extracellular environment. This pathway is termed as the secretory pathway.
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Smooth endoplasmic reticulum or smooth ER is a sub-organelle with specialized functions in animal cells and plant cells. It is often associated with the tubule morphology of the endoplasmic reticulum.
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The ERAD system is restricted by elevated ceramides.

Jiwon Hwang1, Brian G Peterson1, Jeffrey Knupp2

  • 1Department of Biological Chemistry, University of Michigan Medical School, 1150 W Medical Center Drive, Ann Arbor, MI 48109, USA.

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Cellular membrane composition impacts protein quality control. Specific ceramides in the endoplasmic reticulum (ER) membrane hinder ER-associated degradation (ERAD) by blocking substrate extraction.

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Area of Science:

  • Cellular Biology
  • Biochemistry
  • Molecular Biology

Background:

  • Endoplasmic reticulum-associated degradation (ERAD) is a crucial protein quality control pathway.
  • ERAD removes misfolded proteins from the ER lumen via retrotranslocation and proteasomal degradation.
  • The influence of cellular membrane lipid composition on ERAD regulation is largely unknown.

Purpose of the Study:

  • To investigate the role of ER membrane lipid composition in regulating ERAD.
  • To identify specific lipids that affect ERAD substrate processing and extraction.

Main Methods:

  • Unbiased lipidomic profiling of ER membranes.
  • Quantification of ubiquitinated ERAD substrates.
  • Measurement of substrate extraction into the cytoplasm.

Main Results:

  • Elevated levels of specific very-long-chain ceramides were observed.
  • Increased ubiquitinated substrates accumulated within the ER membrane.
  • Reduced extraction of substrates into the cytoplasm was detected.

Conclusions:

  • ER membrane lipid composition directly influences ERAD efficiency.
  • Very-long-chain ceramides can impair ERAD by inhibiting substrate extraction.
  • Lipid remodeling represents a novel regulatory mechanism for ERAD activity.