Biological consequences of overexpressing or eliminating N-acetylglucosaminyltransferase-TIII in the mouse

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Abstract

N-acetylglucosaminyltransferase III (GlcNAc-TIII), a product of the human MGAT3 gene, was discovered as a glycosyltransferase activity in hen oviduct. GlcNAc-TIII transfers GlcNAc in β4-linkage to the core Man of complex or hybrid N-glycans, and thereby alters not only the composition, but also the conformation of the N-glycan. The dramatic consequences of the addition of this bisecting GlcNAc residue are reflected in the altered binding of lectins that recognize Gal residues on N-glycans. Changes in GlcNAc-TIII expression correlate with hepatoma and leukemia in rodents and humans, and the bisecting GlcNAc on Asn 297 of human IgG antibodies enhances their effector functions. Overexpression of a cDNA encoding GlcNAc-TIII alters growth control and cell-cell interactions in cultured cells, and in transgenic mice. While mice lacking GlcNAc-TIII are viable and fertile, they exhibit retarded progression of diethylnitrosamine (DEN)-induced liver tumors. Further biological functions of GlcNAc-TIII are expected to be uncovered as mice with a null mutation in the Mgat3 gene are challenged.

Original languageEnglish (US)
Pages (from-to)363-368
Number of pages6
JournalBiochimica et Biophysica Acta - General Subjects
Volume1573
Issue number3
DOIs
StatePublished - Dec 19 2002

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Keywords

  • Bisecting GlcNAc
  • GlcNAc-TIII
  • Growth control
  • N-acetylglucosaminyltransferase
  • Tumor progression

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Molecular Biology

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