Glucuronyl-galactosyl-proteoglycan 4-alpha-N-acetylglucosaminyltransferase (, alpha-N-acetylglucosaminyltransferase I, alpha1,4-N-acetylglucosaminyltransferase, glucuronosylgalactosyl-proteoglycan 4-alpha-N-acetylglucosaminyltransferase) is an enzyme with systematic name UDP-N-acetyl-D-glucosamine:beta-D-glucuronosyl-(1->3)-beta-D-galactosyl-(1->3)-beta-D-galactosyl-(1->4)-beta-D-xylosyl-proteoglycan 4IV-alpha-N-acetyl-D-glucosaminyltransferase. This enzyme catalyses the following chemical reaction
UDP-N-acetyl-D-glucosamine + beta-D-glucuronosyl-(1->3)-beta-D-galactosyl-(1->3)-beta-D-galactosyl-(1->4)-beta-D-xylosyl-proteoglycan UDP + alpha-N-acetyl-D-glucosaminyl-(1->4)-beta-D-glucuronosyl-(1->3)-beta-D-galactosyl-(1->3)-beta-D-galactosyl-(1->4)-beta-D-xylosyl-proteoglycan
This enzyme is involved in the initiation of heparin and heparan sulfate synthesis.
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