Enables identical protein binding activity. Predicted to be involved in Golgi to lysosome transport. Predicted to act upstream of or within protein transport. Predicted to be located in Golgi apparatus and nucleoplasm. Predicted to be active in trans-Golgi network. Is expressed in central nervous system; genitourinary system; retina; and vibrissa. Orthologous to human CCDC91 (coiled-coil domain containing 91). [provided by Alliance of Genome Resources, Apr 2022]