Extended synaptotagmin-1 (ESYT1)

Binds glycerophospholipids in a barrel-like domain and might play a role in cellular lipid transport (By similarity). Binds calcium (through the C2 domain ) and translocates to sites of contact between the endoplasmic reticulum and the cell membrane in response to increased cytosolic calcium levels.

Helps tether the endoplasmic reticulum to the cell membrane and promotes the formation of appositions between the endoplasmic reticulum and the cell membrane. .