Predicted to enable beta-galactoside (CMP) alpha-2,3-sialyltransferase activity. Predicted to be involved in several processes, including cellular protein modification process; ganglioside biosynthetic process via lactosylceramide; and memory B cell differentiation. Predicted to act upstream of or within protein glycosylation and protein phosphorylation. Predicted to be located in Golgi medial cisterna membrane; Golgi trans cisterna membrane; and trans-Golgi network membrane. Orthologous to human ST3GAL1 (ST3 beta-galactoside alpha-2,3-sialyltransferase 1). [provided by Alliance of Genome Resources, Apr 2022]