Galactosylgalactosylxylosylprotein 3-beta-glucuronosyltransferase 1 (EC 2.4.1.135) (Beta-1,3-glucuronyltransferase 1) (Glucuronosyltransferase-P) (GlcAT-P) (UDP-GlcUA-glycoprotein beta- 1,3-glucuronyltransferase) (GlcUAT-P); Involved in the biosynthesis of L2/HNK-1 carbohydrate epitope on glycoproteins. Can also play a role in glycosaminoglycan biosynthesis. Substrates include asialo- orosomucoid (ASOR), asialo-fetuin, and asialo-neural cell adhesion molecule. Requires sphingomyelin for activity- stearoyl- sphingomyelin was the most effective, followed by palmitoyl- sphingomyelin and l [...] (334 aa)