Catalyzes the first step in the biosynthesis of chondroitin sulfate, heparan sulfate and dermatan sulfate proteoglycans, such as DCN. Transfers D-xylose from UDP-D-xylose to specific serine residues of the core protein.
Subcellular locations: Golgi apparatus membrane, Secreted
Widely expressed. Expressed at higher level in kidney and pancreas.