Component of a multiprotein complex equivalent of the yeast SWI/SNF complex, an ATP-dependent chromatin-remodeling complex, which is required for the positive and negative regulation of gene expression of a large number of genes. It changes chromatin structure by altering DNA-histone contacts within a nucleosome, leading eventually to a change in nucleosome position, thus facilitating or repressing binding of gene-specific transcription factors. Interacts with SWI3A and SWI3B, but not with BRM. A number of isoforms are produced. According to EST sequences. Expressed in roots, stems, leaves, flowers and siliques. Was named BUSHY by PubMed:10325430 because antisense transgenic plants have a 'bushy' phenotype. Belongs to the SNF5 family.