Characterization of the N-deacetylase domain from the heparan sulfate N-deacetylase/N-sulfotransferase 2

Michael B. Duncan, May Liu, Courtney Fox, Jian Liu

Research output: Contribution to journalArticle

34 Scopus citations

Abstract

Heparin and heparan sulfate are linear sulfated polysaccharides that exert a multitude of biological functions. Heparan sulfate glucosaminyl N-deacetylase/N-sulfotransferase isoform 2 (NDST-2), a key enzyme in the biosynthesis of heparin, contains two distinct activities. This bifunctional enzyme removes the acetyl group from N-acetylated glucosamine (N-deacetylase activity) and transfers a sulfuryl group to the unsubstituted amino position (N-sulfotransferase activity). The N-sulfotransferase activity of NDST has been unambiguously localized to the C-terminal domain of NDST. Here, we report that the N-terminal domain of NDST-2 retains N-deacetylase activity. The N-terminal domain (A66-P604) of human NDST-2, designated as N-deacetylase (NDase), was cloned as a (His)6-fusion protein, and protein expression was carried out in Escherichia coli. Heparosan treated with NDase contains N-unsubstituted glucosamine and is highly susceptible to N-sulfation by N-sulfotransferase. Our results conclude that the N-terminal domain of NDST-2 contains functional N-deacetylase activity. This finding helps further elucidate the mechanism of action of heparan sulfate N-deacetylase/N-sulfotransferases and the biosynthesis of heparan sulfate in general.

Original languageEnglish (US)
Pages (from-to)1232-1237
Number of pages6
JournalBiochemical and Biophysical Research Communications
Volume339
Issue number4
DOIs
Publication statusPublished - Jan 27 2006

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Keywords

  • Deacetylase
  • Heparan sulfate
  • Heparin
  • Polysaccharides
  • Sulfotransferase

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Molecular Biology
  • Cell Biology

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