Positive regulator of protein phosphatase SIT4. Involved in the general amino acid control (GAAC) response regulated by TOR. Involved in the dephosphorylation of the elongator complex subunit IKI3. Associates with the SIT4 protein phosphatase catalytic subunit in a cell-cycle-dependent manner. Hyperphosphorylated in the absence of SIT4. Belongs to the SAPS family.