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A sweet code for glycoprotein folding.

Julio J Caramelo1, Armando J Parodi1

  • 1Fundación Instituto Leloir and Instituto de Investigaciones Bioquímicas de Buenos Aires (IIBBA-CONICET), Avda. Patricias Argentinas 435, Buenos Aires C1405BWE, Argentina.

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|July 31, 2015
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Summary
This summary is machine-generated.

Glycoprotein folding in the endoplasmic reticulum (ER) relies on N-glycan modifications. This quality control system ensures proper protein folding and targets misfolded proteins for degradation.

Keywords:
CalnexinCalreticulinChaperonesEndoplasmic reticulumGlucosyltransferaseGlycoprotein foldingProteasomal degradation

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Background:

  • Glycoprotein synthesis begins with N-glycosylation in the ER lumen.
  • N-glycans are crucial for endoplasmic reticulum (ER)-associated quality control of glycoprotein folding.
  • This system prevents the exit of misfolded or incompletely assembled glycoproteins to the Golgi apparatus.

Purpose of the Study:

  • To elucidate the molecular mechanisms of N-glycan-dependent quality control in glycoprotein folding.
  • To identify the key components involved in recognizing and processing glycoproteins within the ER.
  • To understand how misfolded glycoproteins are targeted for degradation.

Main Methods:

  • The study focuses on the interplay of lectin-chaperones (calnexin, calreticulin), ERp57, UGGT, and GII.
  • Analysis of glycoprotein conformation sensing by glucosidase II (GII).
  • Investigation of the role of ER mannosidases in targeting misfolded glycoproteins for ER-associated degradation (ERAD).

Main Results:

  • The N-glycan-dependent quality control system involves calnexin/calreticulin, ERp57, UGGT, and GII.
  • Glucosidase II (GII) is the sole component that senses glycoprotein conformation by selectively acting on misfolded proteins.
  • ER-associated degradation (ERAD) pathways, involving ER mannosidases, identify and target irreparably misfolded glycoproteins for proteasomal degradation.

Conclusions:

  • N-glycan processing is central to ensuring glycoprotein fidelity within the ER.
  • The conformational sensing by GII is a critical checkpoint in glycoprotein quality control.
  • The ERAD pathway effectively clears misfolded glycoproteins, maintaining cellular homeostasis.