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Why are proteins O-glycosylated?

N Jentoft1

  • 1Department of Pediatrics, Case Western Reserve University, Cleveland, OH 44106.

Trends in Biochemical Sciences
|August 1, 1990
PubMed
Summary

O-linked oligosaccharides on glycoproteins cluster together, causing the peptide core to become stiff and extended. This conformational change is a key function of O-glycosylation.

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Area of Science:

  • Biochemistry
  • Glycobiology
  • Structural Biology

Background:

  • O-linked oligosaccharides are common post-translational modifications on proteins.
  • These carbohydrates are often found in dense clusters on the peptide backbone.

Purpose of the Study:

  • To investigate the structural consequences of clustered O-linked oligosaccharides on peptide conformation.
  • To elucidate a potential major function of O-glycosylation based on its structural impact.

Main Methods:

  • Analysis of glycoprotein structures with heavily glycosylated regions.
  • Examination of steric interactions between clustered carbohydrates and the peptide core.

Main Results:

  • O-linked oligosaccharide clusters induce significant steric hindrance.
  • This steric hindrance forces the peptide core into a stiff and extended conformation.

Conclusions:

  • The conformational rigidity imparted by O-glycosylation clusters is a primary function of this modification.
  • O-glycosylation plays a crucial role in defining protein structure and potentially function through conformational control.

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