Predicted to enable enzyme binding activity and p53 binding activity. Predicted to be involved in several processes, including negative regulation of intrinsic apoptotic signaling pathway by p53 class mediator; negative regulation of nitrogen compound metabolic process; and protein stabilization. Predicted to act upstream of or within heart development; positive regulation of cell population proliferation; and regulation of heart rate. Predicted to be located in nucleoplasm. Predicted to be active in nucleus. Orthologous to human MDM4 (MDM4 regulator of p53). [provided by Alliance of Genome Resources, Apr 2022]