Enhances the phosphorylation and activation of AKT1 and AKT2. Interacts with AKT1 and AKT2 (via PH domain). Does not interact with AKT3 (By similarity). Not found at a significant level in any tissue. Shares a non-coding 5' exon with isoform 1 which is spliced to a different set of 3' exons encoding an unrelated protein. Belongs to the TCL1 family.