label: heparan sulfate 2-O-sulfotransferase activity
label_lc: heparan sulfate 2-o-sulfotransferase activity
description: "Catalysis of the reaction: 3'-phosphoadenosine 5'-phosphosulfate + heparan sulfate = adenosine 3',5'-bisphosphate + heparan sulfate 2-O-sulfate; results in 2-O-sulfation of iduronic acid residues in heparan sulfate."