Mannotetraose 2-alpha-N-acetylglucosaminyltransferase

Mannotetraose 2-alpha-N-acetylglucosaminyltransferase
mannotetraose 2-alpha-N-acetylglucosaminyltransferase
Identifiers
EC number 2.4.1.138
CAS number 81032-47-5
Databases
IntEnz IntEnz view
BRENDA BRENDA entry
ExPASy NiceZyme view
KEGG KEGG entry
MetaCyc metabolic pathway
PRIAM profile
PDB structures RCSB PDB PDBe PDBsum
Gene Ontology AmiGO / EGO

In enzymology, a mannotetraose 2-alpha-N-acetylglucosaminyltransferase (EC 2.4.1.138) is an enzyme that catalyzes the chemical reaction

UDP-N-acetyl-D-glucosamine + 1,3-alpha-D-mannosyl-1,2-alpha-D-mannosyl-1,2-alpha-D-mannosyl-D-mannose \rightleftharpoons UDP + 1,3-alpha-D-mannosyl-1,2-(N-acetyl-alpha-D-glucosaminyl-alpha-D-mannosyl)-1,2-alpha-D-mannosyl-D-mannose

The 2 substrates of this enzyme are UDP-N-acetyl-D-glucosamine and 1,3-alpha-D-mannosyl-1,2-alpha-D-mannosyl-1,2-alpha-D-mannosyl-D-mannose, whereas its 2 products are UDP and 1,3-alpha-D-mannosyl-1,2-(N-acetyl-alpha-D-glucosaminyl-alpha-D-mannosyl)-1,2-alpha-D-mannosyl-D-mannose.

This enzyme belongs to the family of glycosyltransferases, specifically the hexosyltransferases. The systematic name of this enzyme class is UDP-N-acetyl-D-glucosamine:mannotetraose alpha-N-acetyl-D-glucosaminyltransferase. Other names in common use include alpha-N-acetylglucosaminyltransferase, uridine diphosphoacetylglucosamine mannoside, and alpha1->2-alphacetylglucosaminyltransferase.

References

  • Douglas RH, Ballou CE (1982). "Purification of an alpha-N-acetylglucosaminyltransferase from the yeast Kluyveromyces lactis and a study of mutants defective in this enzyme activity". Biochemistry. 21 (7): 1561–70. doi:10.1021/bi00536a015. PMID 6211189. 
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