Predicted to enable syntaxin binding activity. Predicted to be involved in several processes, including Golgi organization; Golgi vesicle transport; and intracellular protein transport. Predicted to act upstream of or within protein transport. Located in synaptic vesicle. Is expressed in embryo. Orthologous to human TMED9 (transmembrane p24 trafficking protein 9). [provided by Alliance of Genome Resources, Apr 2022]