Enables galactosylgalactosylxylosylprotein 3-beta-glucuronosyltransferase activity. Involved in cellular response to hypoxia. Located in Golgi membrane and endoplasmic reticulum membrane. Biomarker of pulmonary fibrosis. Orthologous to human B3GAT1 (beta-1,3-glucuronyltransferase 1). [provided by Alliance of Genome Resources, Apr 2022]