GO:0015018

galactosylgalactosylxylosylprotein 3-beta-glucuronosyltransferase activity

Details: 
Catalysis of the reaction: UDP-glucuronate + 3-beta-D-galactosyl-4-beta-D-galactosyl-O-beta-D-xylosylprotein = UDP + 3-beta-D-glucuronosyl-3-beta-D-galactosyl-4-beta-D-galactosyl-O-beta-D-xylosylprotein. [EC:2.4.1.135]
Evidence Code: