O-linked N-acetylglucosamine suppresses thermal aggregation of Sp1

Ki Hong Lim, Hyo Ihl Chang

Research output: Contribution to journalArticlepeer-review

34 Citations (Scopus)


We demonstrate that O-linked N-acetylglucosamine (O-GlcNAc), a ubiquitous protein modification in eukaryotes, suppresses thermal inactivation of Sp1 transcription factor. 6-Diazo-5-oxonorleucine treatment or O-GlcNAcase overexpression, which reduced O-GlcNAc levels on Sp1, deteriorated thermal stability of Sp1 and O-GlcNAc modified molecules of Sp1 resist thermal aggregation in vitro. We also showed that heat-induced elevation of heat shock protein 70 was facilitated by Sp1 but blunted under low O-GlcNAc levels, suggesting that O-GlcNAc might upregulate the expression of heat shock protein 70 through thermoprotection of Sp1, which eventually enhanced cellular thermotolerance.

Original languageEnglish
Pages (from-to)4645-4652
Number of pages8
JournalFEBS Letters
Issue number19
Publication statusPublished - 2006 Aug 21


  • Heat shock protein 70
  • O-GlcNAc
  • Sp1
  • Thermal aggregation
  • Thermotolerance

ASJC Scopus subject areas

  • Biophysics
  • Structural Biology
  • Biochemistry
  • Molecular Biology
  • Genetics
  • Cell Biology


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