Enables RNA polymerase II cis-regulatory region sequence-specific DNA binding activity and transcription coactivator activity. Involved in several processes, including circadian regulation of gene expression; entrainment of circadian clock by photoperiod; and locomotor rhythm. Located in cytoplasm and nucleus. Part of NuRD complex. Is expressed in several structures, including central nervous system; early conceptus; genitourinary system; and long bone epiphysis. Orthologous to human MTA1 (metastasis associated 1). [provided by Alliance of Genome Resources, Apr 2022]