Term Name:	glucuronyl-galactosyl-proteoglycan 4-alpha-N-acetylglucosaminyltransferase activity
Synonyms:	alpha-1,4-N-acetylglucosaminyltransferase activity, alpha-N-acetylglucosaminyltransferase I activity, alpha1,4-N-acetylglucosaminyltransferase activity, glucuronosylgalactosyl-proteoglycan 4-alpha-N-acetylglucosaminyltransferase activity, 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 activity, 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 activity
Definition:	Catalysis of the reaction: 3-O-(beta-D-GlcA-(1->3)-beta-D-Gal-(1->3)-beta-D-Gal-(1->4)-beta-D-Xyl)-L-seryl-[protein] + UDP-N-acetyl-alpha-D-glucosamine = 3-O-(alpha-D-GlcNAc-(1->4)-beta-D-GlcA-(1->3)-beta-D-Gal-(1->3)-beta-D-Gal-(1->4)-beta-D-Xyl)-L-seryl-[protein] + H+ + UDP.
Ontology:	GO: Molecular Function [GO:0001888]    QuickGO    AmiGO