Component of the SWI5-SFR1 complex, a complex required for double-strand break repair via homologous recombination (PubMed:21252223). Acts as a transcriptional modulator for ESR1 (PubMed:23874500). Component of the SWI5-SFR1 complex. Interacts with RAD51; the interaction is weak (PubMed:21252223). Interacts with ESR1 in the ligand-independent and ligand-dependent manner (PubMed:23874500). Colocalizes with ESR1 in the nucleus. Widely expressed. Belongs to the SFR1/MEI5 family.