Project DetailsAberrant trafficking of Alzheimer's disease (AD)-associated molecules, such as beta-amyloid precursor protein (APP) and beta-site APP-cleaving enzyme 1 (BACE1), has been extensively implicated in the neuropathogenesis of AD. BACE1 mediates the first of two cleavage events of APP to yield amyloid beta-peptide (A-beta). Recent studies suggest that aberrant regulation of molecular components of the endosome and trans-Golgi network (TGN) may contribute to the enhanced A-beta levels associated with AD. We discovered that a novel sorting 'nexin', a member of the family of trafficking proteins that bind phospholipids, binds BACE1 and regulates the cleavage of APP. Our proposed studies will investigate the mechanism underlying the regulation of BACE1 trafficking and beta-amyloid generation in neurons by this novel sorting nexin. Gaining insight into these cellular mechanisms will lead to development of novel therapeutic approaches for preventing or treating AD.