ATPase subunit of a multiprotein complex equivalent of the SWI/SNF complex that acts by remodeling the chromatin by catalyzing an ATP-dependent alteration in the structure of nucleosomal DNA. Represses embryonic genes in leaves and controls shoot development and flowering. Activates flower homeotic genes. The association of BRM with its target genes requires REF6 (PubMed:27111034). Necessary to acquire heat stress (HS) memory, by globally binding to HS memory genes (PubMed:27680998). ATP + H2O = ADP + H(+) + phosphate Interacts with SWI3B, SWI3C, H3 and H4, but not with SWI3A, SWI3D or BSH (PubMed:15371304, PubMed:16845477, PubMed:17825834). Interacts with LFY (PubMed:22323601). Interacts with REF6 (PubMed:27111034). Binds to FGT1 (PubMed:27680998). Highly expressed in inflorescences and leaves. Low expression in siliques, roots and seedlings. Detected in shoot apical meristem, root meristem, vascular tissue of developing leaves, petals, stamens filaments, anthers and carpels. The bromodomain binds histones. The AT-hook region (1568-1919) contains at least 3 DNA-binding sites with different characteristics. Sterility. Reduced heat stress (HS) memory associated with a premature decline of expression of HSA32, HSP18.2, HSP21, HSP22 and HSP101 after HS. The double mutant brm-1 fgt1-1 exhibits retarted seedling development resulting in reduced development and delayed leaf initiation, as well as delayed flowering time. Was previously split between At2g46010 and At2g46020. Belongs to the SNF2/RAD54 helicase family.