Inhibits the interaction of APBA2 with amyloid-beta precursor protein (APP), and hence allows formation of amyloid-beta (By similarity). May enhance the activity of HIF1A and thus promote glycolysis under normoxic conditions; the function requires its ABM domain and may implicate the stabilization of the interaction between HIF1AN and APBA3 (By similarity). Interacts with the N-terminal domain of APBA2. Interacts with NEK2 (By similarity). Interacts with APBA3; APBA3 seems to mediate the interaction between NECAB3 and HIF1AN (By similarity). Phosphorylated by NEK2.