Predicted to enable SNAP receptor activity. Acts upstream of or within endoplasmic reticulum tubular network organization and regulation of ER to Golgi vesicle-mediated transport. Predicted to be located in COPI-coated vesicle; Golgi apparatus; and plasma membrane. Predicted to be part of SNARE complex. Predicted to be active in endoplasmic reticulum. Is expressed in several structures, including early conceptus; embryo ectoderm; embryo mesoderm; optic vesicle; and primitive streak. Orthologous to human USE1 (unconventional SNARE in the ER 1). [provided by Alliance of Genome Resources, Apr 2022]