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Nuclear and cytoplasmic glycosylation

D M Snow1, G W Hart

  • 1Department of Biological Chemistry, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205, USA.

International Review of Cytology
|April 2, 1998
PubMed
Summary

O-GlcNAcylation is a dynamic posttranslational modification found on many proteins. This process, involving N-acetylglucosamine attachment, may regulate protein interactions and antagonize phosphorylation in essential cellular functions.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Background:

  • O-GlcNAcylation is a cytoplasmic and nuclear glycosylation process.
  • It involves the attachment of a single N-acetylglucosaminyl residue to serine and threonine residues of proteins.
  • This modification is abundant, dynamic, and found on diverse proteins, including transcription factors and oncogenes.

Purpose of the Study:

  • To elucidate the role of O-GlcNAcylation as a posttranslational modification.
  • To investigate the relationship between O-GlcNAcylation and phosphorylation.
  • To understand how O-GlcNAcylation influences protein function and interactions.

Main Methods:

  • The study focuses on the biochemical and functional characteristics of O-GlcNAcylation.
  • Analysis of proteins modified by O-GlcNAc, including RNA polymerase II and associated factors.
  • Comparison of O-GlcNAc sites with known phosphorylation sites.

Main Results:

  • O-GlcNAcylation modulates protein function similarly to phosphorylation.
  • O-GlcNAc-modified proteins are often phosphoproteins involved in complex formation.
  • O-GlcNAc sites frequently overlap with phosphorylation sites, suggesting mutual exclusivity.

Conclusions:

  • O-GlcNAcylation plays a significant role in mediating protein-protein interactions.
  • This modification may act antagonistically to phosphorylation.
  • O-GlcNAcylation is crucial for regulating essential cellular functions.

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