May play a role in regulated exocytosis. In neuronal cells, modulates the localization of synaptophysin/SYP into synaptic-like microvesicles and may therefore play a role in the formation and/or the maturation of this vesicles. May also play a role in GLUT4 storage and transport to the plasma membrane. Localizes to cytoplasmic vesicles associated with the recycling endosomes. May be tyrosine phosphorylated by Src. Belongs to the synaptogyrin family.