Synaptotagmin family member which does not bind Ca(2+) (By similarity) (PubMed:23999003). Involved in neuronal dense core vesicles (DCVs) mobility through its interaction with KIF1A. Upon increased neuronal activity, phosphorylation by MAPK8/JNK1 destabilizes the interaction with KIF1A and captures DCVs to synapses (By similarity). Plays a role in dendrite formation by melanocytes (PubMed:23999003). . This is the function of SYT4 (synaptotagmin 4, Ensembl gene identifier ENSG00000132872).