Synaptotagmin-3 (SYT3) belongs to the synaptotagmin family, which is a group of membrane-trafficking proteins that contain two C-terminal C2 domains. Most of the synaptotagmins have a unique N-terminal domain that is involved in membrane anchoring or specific ligand binding. SYT3 is required for the formation and delivery of cargo to the perinuclear endocytic recycling compartment (ERC) []. Among synaptotagmins 1-11, SYT3 is the only one that is expressed in T cells. It is essential for chemokine receptor CXCR4 recycling in T cells and thereby affects CXCL12 chemokine-induced migration [].
