Predicted to enable GTPase activity. Predicted to be involved in several processes, including endoplasmic reticulum to Golgi vesicle-mediated transport; regulation of COPII vesicle coating; and vesicle organization. Predicted to act upstream of or within intracellular protein transport and vesicle-mediated transport. Predicted to be located in Golgi cisterna membrane; endoplasmic reticulum membrane; and lysosomal membrane. Predicted to be part of COPII vesicle coat. Predicted to be active in endoplasmic reticulum exit site. Orthologous to human SAR1A (secretion associated Ras related GTPase 1A).