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Related Experiment Videos

Glycoprotein reglucosylation.

E Sergio Trombetta1, Armando J Parodi

  • 1Department of Cell Biology, Yale University School of Medicine, P.O. Box 208002, New Haven, CT 06520-8002, USA. sergio.trombetta@yale.edu

Methods (San Diego, Calif.)
|April 5, 2005
PubMed
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Glycobiology·2016

Cells use monoglucosylated N-glycans in the endoplasmic reticulum (ER) to sort proteins. This chapter explores glycoprotein deglucosylation and reglucosylation, key steps in managing these essential N-glycans during protein folding.

Area of Science:

  • Biochemistry
  • Cell Biology
  • Glycobiology

Background:

  • Proteins require proper folding in the endoplasmic reticulum (ER) for function.
  • Misfolded proteins are retained in the ER and targeted for degradation.
  • N-glycans play a crucial role in glycoprotein folding and quality control within the ER.

Purpose of the Study:

  • To elucidate the regulatory mechanisms controlling monoglucosylated N-glycans in the ER.
  • To discuss the roles of glycoprotein deglucosylation and reglucosylation in glycoprotein homeostasis.
  • To provide an overview of methods for analyzing N-glycans during glycoprotein biogenesis.

Main Methods:

  • Focuses on the enzymatic activities of glucosidase II and UDP-Glc:glycoprotein glucosyltransferase.
  • Discusses analytical techniques for evaluating N-glycan structures.

Related Experiment Videos

  • Reviews established methodologies in glycoprotein analysis.

    • Main Results:

    • Monoglucosylated N-glycans serve as critical signals for glycoprotein folding and ER retention.
    • The balance between deglucosylation and reglucosylation dictates the availability of these sorting signals.
    • Specific methods allow for the assessment of N-glycan profiles during protein biogenesis.

    Conclusions:

    • The regulation of monoglucosylated N-glycans is a central aspect of the ER protein-folding quality control system.
    • Understanding these glycan modifications is key to comprehending protein homeostasis.
    • This chapter provides a foundation for further research into ER-associated glycoprotein processing.