Enables PDZ domain binding activity. Involved in several processes, including Golgi to transport vesicle transport; oligodendrocyte differentiation; and positive regulation of calcium-mediated signaling. Located in several cellular components, including dendritic shaft; growth cone; and postsynaptic density. Part of protein-containing complex. Is active in synaptic vesicle. Colocalizes with Golgi apparatus and endosome. Orthologous to human EXOC4 (exocyst complex component 4). [provided by Alliance of Genome Resources, Apr 2022]