Enables monosialoganglioside sialyltransferase activity. Predicted to be involved in several processes, including cellular protein modification process; lipid glycosylation; and positive regulation of leukocyte tethering or rolling. Predicted to be located in Golgi cisterna membrane. Predicted to be integral component of membrane. Orthologous to human ST3GAL4 (ST3 beta-galactoside alpha-2,3-sialyltransferase 4). [provided by Alliance of Genome Resources, Apr 2022]