Tethers the endoplasmic reticulum to the cell membrane and promotes the formation of appositions between the endoplasmic reticulum and the cell membrane. Binds glycerophospholipids in a barrel-like domain and may play a role in cellular lipid transport. Plays a role in FGF signaling via its role in the rapid internalization of FGFR1 that has been activated by FGF1 binding; this occurs most likely via the AP-2 complex. Promotes the localization of SACM1L at endoplasmic reticulum-plasma membrane contact sites (EPCS) .
Subcellular locations: Cell membrane, Endoplasmic reticulum membrane
Localizes to endoplasmic reticulum-plasma membrane contact sites (EPCS) ( , ). Recruited to the cell membrane via the third C2 domain .
Widely expressed with high level in cerebellum.