Enables identical protein binding activity. Involved in several processes, including chromosome organization; multicellular organismal locomotion; and muscle cell cellular homeostasis. Predicted to be located in chromosome; cytoplasm; and microtubule cytoskeleton. Predicted to be active in nucleus. Predicted to colocalize with PML body. Is expressed in several structures, including P3.p hermaphrodite; P4.p hermaphrodite; hypodermis; nervous system; and reproductive system. Human ortholog(s) of this gene implicated in orofacial cleft 10. Orthologous to human SUMO1 (small ubiquitin like modifier 1).