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Membrane Protein Quantity Control at the Endoplasmic Reticulum.

Ignat Printsev1, Daniel Curiel1, Kermit L Carraway2

  • 1Department of Biochemistry and Molecular Medicine, and UC Davis Comprehensive Cancer Center, UC Davis School of Medicine, Research Building III, Room 1100B, 4645 2nd Avenue, Sacramento, CA, 95817, USA.

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The endoplasmic reticulum-associated degradation (ERAD) system not only degrades misfolded proteins but also regulates protein levels. This quantity control function impacts ER-resident proteins and signaling receptors, influencing cellular signaling.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Protein Degradation

Background:

  • The endoplasmic reticulum-associated degradation (ERAD) system is primarily known for quality control of misfolded proteins.
  • Emerging evidence indicates ERAD also functions in 'quantity control' of specific membrane proteins.
  • This regulation adapts to cellular needs and environmental cues.

Purpose of the Study:

  • To review the role of ERAD in protein quantity control.
  • To discuss specific ERAD substrates involved in this process.
  • To explore the implications for cellular signaling.

Main Methods:

  • Literature review of studies on ERAD quantity control.
  • Analysis of ERAD substrates including ER-resident proteins and plasma membrane receptors.
  • Discussion of regulatory mechanisms and functional consequences.

Main Results:

  • Seven proteins are detailed as targets of ERAD quantity control.
  • ERAD regulates ER-resident proteins like HMG-CoA reductase and cytochrome P450 3A4.
  • ERAD also impacts plasma membrane receptors (e.g., ErbB3, GABA receptors), affecting their trafficking and abundance.

Conclusions:

  • ERAD's quantity control is crucial for maintaining cellular protein homeostasis.
  • This system regulates both internal ER proteins and cell surface receptors.
  • ERAD-mediated degradation of signaling receptors offers a novel mechanism for modulating cellular responses.