Predicted to enable alpha-N-acetylneuraminate alpha-2,8-sialyltransferase activity. Predicted to be involved in N-glycan processing; oligosaccharide metabolic process; and protein glycosylation. Predicted to be located in Golgi membrane. Orthologous to human ST8SIA5 (ST8 alpha-N-acetyl-neuraminide alpha-2,8-sialyltransferase 5).