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ER is the primary site for the maturation and folding of soluble and transmembrane secretory proteins. The calnexin cycle is a specific chaperone system that folds and assesses the confirmation of N-glycosylated proteins before they can exit the ER lumen. The primary players of this quality check pipeline are the lectins, ER-resident chaperones, and a glucosyl transferase enzyme. In case the calnexin system in the lumen fails to salvage a misfolded protein, it is transported to the cytoplasm...
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Design principles for the glycoprotein quality control pathway.

Aidan I Brown1, Elena F Koslover1

  • 1Department of Physics, University of California, San Diego, San Diego, California, United States of America.

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|February 1, 2021
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Summary
This summary is machine-generated.

This study reveals that the endoplasmic reticulum's protein quality control system, involving cycles of chaperone binding and release, is optimized by energy-consuming processes. Adjusting degradation rates allows this system to adapt to changing protein production levels, maintaining cellular health.

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Area of Science:

  • Cellular Biology
  • Biophysics
  • Systems Biology

Background:

  • Newly synthesized glycoproteins in the endoplasmic reticulum (ER) require chaperone assistance for proper folding.
  • Cellular quality control mechanisms are essential to differentiate between correctly folded, folding, and misfolded proteins.

Purpose of the Study:

  • To quantitatively model and analyze the efficiency of the ER protein quality control pathway.
  • To explore how different pathway designs impact the handling of newly translated glycoproteins.

Main Methods:

  • Utilized quantitative modeling to simulate the glycoprotein folding and quality control process within the ER.
  • Compared the efficiency of an energy-consuming cyclic quality control model with alternative designs.

Main Results:

  • An energy-consuming cyclic quality control process, mimicking the physiological system, demonstrated superior efficiency over alternative designs.
  • Optimal kinetic parameters for the system varied significantly with protein production levels but were less sensitive to protein folding rates.
  • Modulating only the degradation rate enabled the pathway to adapt to diverse protein production levels, consistent with in vivo observations.

Conclusions:

  • The study elucidates key design principles for effective glycoprotein quality control in the ER.
  • Quantitative models provide mechanistic insights into a system vital for maintaining cellular homeostasis and health.