Research Article1 October 1996free access Purification and biochemical heterogeneity of the mammalian SWI-SNF complex. W. Wang W. Wang Howard Hughes Medical Institute, Department of Developmental Biology, Stanford University, CA 94305-5428, USA. Search for more papers by this author J. Côté J. Côté Howard Hughes Medical Institute, Department of Developmental Biology, Stanford University, CA 94305-5428, USA. Search for more papers by this author Y. Xue Y. Xue Howard Hughes Medical Institute, Department of Developmental Biology, Stanford University, CA 94305-5428, USA. Search for more papers by this author S. Zhou S. Zhou Howard Hughes Medical Institute, Department of Developmental Biology, Stanford University, CA 94305-5428, USA. Search for more papers by this author P. A. Khavari P. A. Khavari Howard Hughes Medical Institute, Department of Developmental Biology, Stanford University, CA 94305-5428, USA. Search for more papers by this author S. R. Biggar S. R. Biggar Howard Hughes Medical Institute, Department of Developmental Biology, Stanford University, CA 94305-5428, USA. Search for more papers by this author C. Muchardt C. Muchardt Howard Hughes Medical Institute, Department of Developmental Biology, Stanford University, CA 94305-5428, USA. Search for more papers by this author G. V. Kalpana G. V. Kalpana Howard Hughes Medical Institute, Department of Developmental Biology, Stanford University, CA 94305-5428, USA. Search for more papers by this author S. P. Goff S. P. Goff Howard Hughes Medical Institute, Department of Developmental Biology, Stanford University, CA 94305-5428, USA. Search for more papers by this author M. Yaniv M. Yaniv Howard Hughes Medical Institute, Department of Developmental Biology, Stanford University, CA 94305-5428, USA. Search for more papers by this author J. L. Workman J. L. Workman Howard Hughes Medical Institute, Department of Developmental Biology, Stanford University, CA 94305-5428, USA. Search for more papers by this author G. R. Crabtree G. R. Crabtree Howard Hughes Medical Institute, Department of Developmental Biology, Stanford University, CA 94305-5428, USA. Search for more papers by this author W. Wang W. Wang Howard Hughes Medical Institute, Department of Developmental Biology, Stanford University, CA 94305-5428, USA. Search for more papers by this author J. Côté J. Côté Howard Hughes Medical Institute, Department of Developmental Biology, Stanford University, CA 94305-5428, USA. Search for more papers by this author Y. Xue Y. Xue Howard Hughes Medical Institute, Department of Developmental Biology, Stanford University, CA 94305-5428, USA. Search for more papers by this author S. Zhou S. Zhou Howard Hughes Medical Institute, Department of Developmental Biology, Stanford University, CA 94305-5428, USA. Search for more papers by this author P. A. Khavari P. A. Khavari Howard Hughes Medical Institute, Department of Developmental Biology, Stanford University, CA 94305-5428, USA. Search for more papers by this author S. R. Biggar S. R. Biggar Howard Hughes Medical Institute, Department of Developmental Biology, Stanford University, CA 94305-5428, USA. Search for more papers by this author C. Muchardt C. Muchardt Howard Hughes Medical Institute, Department of Developmental Biology, Stanford University, CA 94305-5428, USA. Search for more papers by this author G. V. Kalpana G. V. Kalpana Howard Hughes Medical Institute, Department of Developmental Biology, Stanford University, CA 94305-5428, USA. Search for more papers by this author S. P. Goff S. P. Goff Howard Hughes Medical Institute, Department of Developmental Biology, Stanford University, CA 94305-5428, USA. Search for more papers by this author M. Yaniv M. Yaniv Howard Hughes Medical Institute, Department of Developmental Biology, Stanford University, CA 94305-5428, USA. Search for more papers by this author J. L. Workman J. L. Workman Howard Hughes Medical Institute, Department of Developmental Biology, Stanford University, CA 94305-5428, USA. Search for more papers by this author G. R. Crabtree G. R. Crabtree Howard Hughes Medical Institute, Department of Developmental Biology, Stanford University, CA 94305-5428, USA. Search for more papers by this author Author Information W. Wang1, J. Côté1, Y. Xue1, S. Zhou1, P. A. Khavari1, S. R. Biggar1, C. Muchardt1, G. V. Kalpana1, S. P. Goff1, M. Yaniv1, J. L. Workman1 and G. R. Crabtree1 1Howard Hughes Medical Institute, Department of Developmental Biology, Stanford University, CA 94305-5428, USA. The EMBO Journal (1996)15:5370-5382https://doi.org/10.1002/j.1460-2075.1996.tb00921.x PDFDownload PDF of article text and main figures. ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InMendeleyWechatReddit Figures & Info We have purified distinct complexes of nine to 12 proteins [referred to as BRG1-associated factors (BAFs)] from several mammalian cell lines using an antibody to the SWI2-SNF2 homolog BRG1. Microsequencing revealed that the 47 kDa BAF is identical to INI1. Previously INI1 has been shown to interact with and activate human immunodeficiency virus integrase and to be homologous to the yeast SNF5 gene. A group of BAF47-associated proteins were affinity purified with antibodies against INI1/BAF47 and were found to be identical to those co-purified with BRG1, strongly indicating that this group of proteins associates tightly and is likely to be the mammalian equivalent of the yeast SWI-SNF complex. Complexes containing BRG1 can disrupt nucleosomes and facilitate the binding of GAL4-VP16 to a nucleosomal template similar to the yeast SWI-SNF complex. Purification of the complex from several cell lines demonstrates that it is heterogeneous with respect to subunit composition. The two SWI-SNF2 homologs, BRG1 and hbrm, were found in separate complexes. Certain cell lines completely lack BRG1 and hbrm, indicating that they are not essential for cell viability and that the mammalian SWI-SNF complex may be tailored to the needs of a differentiated cell type. Previous ArticleNext Article Volume 15Issue 191 October 1996In this issue RelatedDetailsLoading ...