CHST15 Protein, Human (HEK293, His)

CHST15 protein functions as a sulfotransferase with a distinctive role in transferring sulfate from 3'-phosphoadenosine 5'-phosphosulfate (PAPS) to the C-6 hydroxyl group of the GalNAc 4-sulfate residue in chondroitin sulfate A, leading to the formation of chondroitin sulfate E containing GlcA-GalNAc(4,6-SO(4)) repeating units. Additionally, CHST15 transfers sulfate to a unique non-reducing terminal sequence, GalNAc(4SO4)-GlcA(2SO4)-GalNAc(6SO4), resulting in a highly sulfated structure reminiscent of thrombomodulin chondroitin sulfate. Beyond its role in chondroitin sulfate biosynthesis, CHST15 may function as a B-cell receptor involved in BCR ligation-mediated early activation, mediating regulatory signals crucial to B-cell development and the potential regulation of B-cell-specific RAG expression. However, the precise implications of these results in vivo remain unclear. The multifaceted activities of CHST15 highlight its importance in the intricate molecular processes governing chondroitin sulfate modifications and B-cell regulatory pathways, though further research is needed to elucidate its in vivo functions comprehensively.