Enables SMAD binding activity. Involved in mesenchymal cell differentiation involved in bone development; negative regulation of osteoblast differentiation; and positive regulation of myoblast differentiation. Predicted to be located in nucleus. Predicted to be part of nuclear pore. Predicted to be active in cytoplasm. Orthologous to human RANBP3L (RAN binding protein 3 like). [provided by Alliance of Genome Resources, Apr 2022]