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Information on EC 2.4.1.144 - beta-1,4-mannosyl-glycoprotein 4-beta-N-acetylglucosaminyltransferase

for references in articles please use BRENDA:EC2.4.1.144
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IUBMB Comments
The enzyme, found in vertebrates, participates in the processing of N-glycans in the Golgi apparatus. The residue added by the enzyme at position 4 of the beta-linked mannose of the trimannosyl core of N-glycans is known as a bisecting GlcNAc. Unlike GlcNAc residues added to other positions, it is not extended or modified. In addition, its presence prevents the action of other branching enzymes involved in the process such as GlcNAc-T IV (EC 2.4.1.145) and GlcNAc-T V (EC 2.4.1.155), and thus increased activity of GlcNAc-T III leads to a decrease in highly branched N-glycan structures.
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The enzyme appears in viruses and cellular organisms
Synonyms
(GnT)-III, acetylglucosaminyltransferase, uridine diphosphoacetylglucosamine-glycopeptide beta4-, III, beta(1,4)-N-acetylglucosaminyltransferase III, beta-1,4-mannosyl-glycoprotein beta-1,4-N-acetylglucosaminyltransferase, beta-1,4-N-acetylglucosaminyltransferase III, beta-D-mannoside beta-1,4-N-acetylglucosaminyltransferase, beta1,4-N-acetylglucosaminyltransferase III, GlcNAc-transferase-III, GlcNAcTase-III, GnT-III, more
REACTION
REACTION DIAGRAM
COMMENTARY hide
ORGANISM
UNIPROT
LITERATURE
UDP-N-acetyl-alpha-D-glucosamine + beta-D-GlcNAc-(1->2)-alpha-D-Man-(1->3)-[beta-D-GlcNAc-(1->2)-alpha-D-Man-(1->6)]-beta-D-Man-(1->4)-beta-D-GlcNAc-(1->4)-beta-D-GlcNAc-N-Asn-[protein] = UDP + beta-D-GlcNAc-(1->2)-alpha-D-Man-(1->3)-[beta-D-GlcNAc-(1->2)-alpha-D-Man-(1->6)]-[beta-D-GlcNAc-(1->4)]-beta-D-Man-(1->4)-beta-D-GlcNAc-(1->4)-beta-D-GlcNAc-N-Asn-[protein]
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