Sulfotransferase that transfers sulfate from 3'-phosphoadenosine 5'-phosphosulfate (PAPS) to the C-6 hydroxylgroup of the GalNAc 4-sulfate residue of chondroitin sulfate A and forms chondroitin sulfate E containingGlcA-GalNAc(4,6-SO(4)) repeating units. It also transfers sulfate to a unique non-reducing terminal sequence,GalNAc(4SO4)-GlcA(2SO4)-GalNAc(6SO4), to yield a highly sulfated structure similar to the structure found inthrombomodulin chondroitin sulfate. May also act as a B-cell receptor involved in BCR ligation-mediated earlyactivation that mediate regulatory signals key to B-cell development and/or regulation of B-cell-specific RAGexpression; however such results are unclear in vivo
