Predicted to enable DNA-binding transcription repressor activity, RNA polymerase II-specific and RNA polymerase II cis-regulatory region sequence-specific DNA binding activity. Predicted to be involved in negative regulation of transcription by RNA polymerase II. Predicted to be located in several cellular components, including chromatin; mitochondrion; and nucleoplasm. Is expressed in several structures, including central nervous system; genitourinary system; hemolymphoid system; integumental system; and sensory organ. Orthologous to human MXD1 (MAX dimerization protein 1). [provided by Alliance of Genome Resources, Apr 2022]