Predicted to enable galactosylgalactosylxylosylprotein 3-beta-glucuronosyltransferase activity. Predicted to be involved in carbohydrate metabolic process and chondroitin sulfate proteoglycan biosynthetic process. Predicted to act upstream of or within protein glycosylation. Predicted to be located in Golgi apparatus and membrane. Predicted to be active in Golgi membrane.