Has transcriptional repression activity. Acts as corepressor of ESR1; the function seems to involve CTBP1 and histone deacetylases. Interacts with ESR1 and NRIP1 (PubMed:17085477). Interacts (via PXDLS motif) with CTBP1 (PubMed:16393996, PubMed:17085477). Expressed in immature and mature dendritic cells (DCs). Not detected in other blood cell types.