Predicted to enable L-serine-phosphatidylethanolamine phosphatidyltransferase activity. Predicted to act upstream of or within phosphatidylserine biosynthetic process. Predicted to be located in endoplasmic reticulum membrane. Human ortholog(s) of this gene implicated in Lenz-Majewski hyperostotic dwarfism. Orthologous to human PTDSS1 (phosphatidylserine synthase 1).