SWI/SNF complexes facilitate gene activation and transcription factor binding by altering repressive chromatin structures in an ATP-dependent manner. In mammals, SWI/SNF complexes are present in mutliple forms that include 9-12 BRG1-associated factors (BAFs) per complex. These BAF proteins range in molecular weight from 47 to 250 kDa. BAF47/SNF5 (SMARCB1/Ini1) complexes with BRG1- and BRM-containing SWI/SNF complexes. BAF47/SNF5 mRNA is widely expressed in cell lines and tissues, and BAF47/SNF5 gene is mutated in many human tumors. The latter is indicative of a tumor suppressor role for BAF47/SNF5. In addition, mice deficient for BAF47 die early in embryogenesis, while BAF47/SNF5 heterozygous mice display a variety of tumors in the soft tissues of the head and neck. BAF47/SNF5 also binds the HIV-1 integrase and stimulates integrase-mediated DNA joining activity. Thus, BAF47/SNF5 is a component of SWI/SNF complexes that may be critical for normal development and tumor suppression, but may also be a protein utilized for viral DNA integration into host DNA.
This antibody is routinely tested by western blot analysis. Other applications were tested at BD Biosciences Pharmingen during antibody development only or reported in the literature.