Required for the calcium-dependent exocytosis of signal sequence-containing cytokines. Probably acts in cooperation with the SNARE machinery (By similarity). Mainly localizes in Golgi apparatus membrane. Upon calcium-triggered exocytosis, it translocates to the cell membrane. Highly enriched in synaptic vesicles (By similarity). Belongs to the SCAMP family. SCAMP5 subfamily. Truncated C-terminus.