[heparan sulfate]-glucosamine 3-sulfotransferase activity
[heparan sulfate]-glucosamine 3-sulfotransferase activity
Catalysis of the reaction: alpha-D-glucosaminyl-[heparan sulfate](n) + 3'-phosphoadenylyl sulfate = 3-sulfo-alpha-D-glucosaminyl-[heparan sulfate](n) + adenosine 3',5'-bisphosphate + H+.