Inhibits amyloid precursor protein processing, probably by blocking BACE1 activity (By similarity). Enhances trafficking of the glutamate transporter SLC1A1/EAAC1 from the endoplasmic reticulum to the cell surface (PubMed:18096700). Plays a role in the translocation of SLC2A4/GLUT4 from intracellular membranes to the cell membrane which facilitates the uptake of glucose into the cell (By similarity). Interacts with SPAST (By similarity). Interacts with BACE1 (By similarity). Interacts (via first transmembrane domain) with ARL6IP5/GTRAP3-18 (PubMed:18096700). Interacts (via N-terminus) with SLC1A1/EAAC1; the interaction promotes cell surface expression of SLC1A1 (PubMed:18096700). Localizes to intermediate filaments in mononucleated myoblasts and to Z lines in mature myotubes. Expressed in brain and spinal cord (at protein level) (PubMed:18096700). In the embryonic brain cortex, expressed in neurons but not in astrocytes (at protein level) (PubMed:18096700).