Predicted to enable R-SMAD binding activity. Involved in negative regulation of transforming growth factor beta receptor signaling pathway. Predicted to be located in intracellular membrane-bounded organelle. Predicted to be active in Golgi membrane and early endosome membrane. Orthologous to human LDLRAD4 (low density lipoprotein receptor class A domain containing 4). [provided by Alliance of Genome Resources, Apr 2022]