Enhances the phosphorylation and activation of AKT1 and AKT2. Enhances cell proliferation, stabilizes mitochondrial membrane potential and promotes cell survival (By similarity). Homodimer. Interacts with AKT1, AKT2 and AKT3 (via PH domain). Interacts with PNPT1; the interaction has no effect on PNPT1 exonuclease activity (By similarity). Microsomal fraction. Belongs to the TCL1 family.