Transcription coregulator that can have both coactivator and corepressor functions. Involved in the coactivation of nuclear receptors for retinoid X (RXRs) and thyroid hormone (TRs) in a ligand-dependent fashion. Probable component of a centromeric complex involved in assembly of kinetochore proteins, mitotic progression and chromosome segregation (By similarity). Localizes to the inner kinetochore domain of centromeres. Contains one Leu-Xaa-Xaa-Leu-Leu (LXXLL) motif, a motif known to be important for the association with nuclear receptors.