Predicted to enable SUMO activating enzyme activity. Acts upstream of or within several processes, including fin morphogenesis; regulation of cartilage development; and regulation of neural retina development. Predicted to be located in nucleus. Predicted to be part of SUMO activating enzyme complex. Predicted to be active in cytoplasm. Is expressed in forebrain neural rod; head; nervous system; pectoral fin bud; and somite. Orthologous to human UBA2 (ubiquitin like modifier activating enzyme 2).