Involved in the recruitment and site-specific anchoring of the Brahma complex at specific promoter sites (PubMed:16083904, PubMed:24618901). The Brahma complex is a multiprotein complex which is the equivalent of the yeast SWI/SNF complex and acts by remodeling the chromatin by catalyzing an ATP-dependent alteration in the structure of nucleosomal DNA (PubMed:16083904, PubMed:24618901). This complex can both serve as a transcriptional coactivator or corepressor, depending on the context (PubMed:16083904). Participates in X-chromosomal dosage compensation (PubMed:16083904). Participates in neurogenesis (PubMed:16083904, PubMed:24618901). There are 2 distinct Brahma complexes in the fruit fly, the Brahma-associated proteins (BAP) and Polybromo-containing BAP (PBAP) complexes, which are composed of common subunits Brm, Mor, Snr1/Bap45, Bap111/Dalo, Bap55, Bap60 and Act42A/Bap47, and additional signature subunits osa in the BAP complex and Polybromo and Bap170 in the PBAP complex (PubMed:15060132). Interacts with sisA and sc (PubMed:16083904). Interacts with mor (PubMed:10809665). Interacts with p53 (PubMed:20308539). Interacts with erm (via N-terminal) (PubMed:24618901). Interacts with akirin; interaction is immune stimulation-dependent; activates selected Rel target gene promoters (PubMed:25180232). Expressed both maternally and zygotically. Maternal expression is uniform at the blastoderm stage. Zygotic expression becomes predominant at the extended band stage. After germ band retraction, expression is restricted to the ventral nerve chord and the brain. RNAi-mediated knockdown results in ectopic expression of type II neuroblast lineages in larval brains.