Enables protein phosphatase 2A binding activity and tau protein binding activity. Predicted to be involved in peptidyl-serine dephosphorylation. Predicted to act upstream of or within response to morphine. Predicted to be part of protein phosphatase type 2A complex. Predicted to be active in cytosol and glutamatergic synapse. Orthologous to human PPP2R2A (protein phosphatase 2 regulatory subunit Balpha). [provided by Alliance of Genome Resources, Apr 2022]