Enables sialyltransferase activity. Involved in several processes, including negative regulation of macrophage apoptotic process; protein sialylation; and regulation of substrate adhesion-dependent cell spreading. Located in Golgi medial cisterna; Golgi trans cisterna; and endoplasmic reticulum. Used to study high grade glioma. Orthologous to human ST6GAL1 (ST6 beta-galactoside alpha-2,6-sialyltransferase 1). [provided by Alliance of Genome Resources, Apr 2022]