Fig. 3. Schematic depiction of mouse FoxO1 and FoxO6 proteins.
FoxO1 and FoxO6 are characterized by the amino DNA binding motif and carboxyl trans-activation domain. They share a conserved bipartite basic nuclear localization signal (NLS) within the DNA binding domain. FoxO1 contains a nuclear export signal (NES) within its carboxyl trans-activation domain. Such a characteristic motif is lacking in FoxO6. FoxO1 contains three Akt/PKB phosphorylation sites (T24, S253, and S316). In contrast, only two Akt/PKB phosphorylation sites (T26 and S184) are present in FoxO6.