Enables protein phosphatase 1 binding activity. Involved in several processes, including cellular response to nutrient levels; cellular response to organonitrogen compound; and regulation of cellular protein metabolic process. Located in cytosol. Biomarker of brain ischemia and transient cerebral ischemia. Orthologous to human PPP1R15A (protein phosphatase 1 regulatory subunit 15A). [provided by Alliance of Genome Resources, Apr 2022]