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Molecular and Cellular Biology, March 2002, p. 1307-1316, Vol. 22, No. 5
0270-7306/02/$04.00+0     DOI: 10.1128/MCB.22.5.1307-1316.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

BAF53 Forms Distinct Nuclear Complexes and Functions as a Critical c-Myc-Interacting Nuclear Cofactor for Oncogenic Transformation

Jeonghyeon Park, Marcelo A. Wood, and Michael D. Cole*

Department of Molecular Biology, Princeton University, Princeton, New Jersey 08544-1014

Received 18 October 2001/ Accepted 30 November 2001

The c-Myc oncoprotein functions as a transcription factor that can transform normal cells into tumor cells, as well as playing a direct role in normal cell proliferation. The c-Myc protein transactivates cellular promoters by recruiting nuclear cofactors to chromosomal sites through an N-terminal transactivation domain. We have previously reported the identification and functional characterization of four different c-Myc cofactors: TRRAP, hGCN5, TIP49, and TIP48. Here we present the identification and characterization of the actin-related protein BAF53 as a c-Myc-interacting nuclear cofactor that forms distinct nuclear complexes. In addition to the human SWI/SNF-related BAF complex, BAF53 forms a complex with TIP49 and TIP48 and a separate biochemically distinct complex containing TRRAP and a histone acetyltransferase which does not contain TIP60. Using deletion mutants of BAF53, we show that BAF53 is critical for c-Myc oncogenic activity. Our results indicate that BAF53 plays a functional role in c-Myc-interacting nuclear complexes.

* Corresponding author. Mailing address: Department of Molecular Biology, Princeton University, Princeton, NJ 08544-1014. Phone: (609) 258-5936. Fax: (609) 258-4575. E-mail: mcole{at}molbio.princeton.edu.

Molecular and Cellular Biology, March 2002, p. 1307-1316, Vol. 22, No. 5
0022-538X/02/$04.00+0     DOI: 10.1128/MCB.22.5.1307-1316.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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