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Published online 24 February 2004

Nucleic Acids Research, 2004, Vol. 32, No. 4 1345-1353
© 2004 Oxford University Press

The DNA-binding properties of the ARID-containing subunits of yeast and mammalian SWI/SNF complexes

Deborah Wilsker, Antonia Patsialou, Steven D. Zumbrun, Suhkmann Kim1, Yuan Chen1, Peter B. Dallas2 and Elizabeth Moran*

Fels Institute for Cancer Research, Temple University School of Medicine, Philadelphia, PA, USA 1 Beckman Research Institute of the City of Hope, Duarte, CA, USA and 2 TVW Telethon Institute for Child Health Research and the Center for Child Health Research, Subiaco, Australia

*To whom correspondence should be addressed. Tel: +1 215 707 7313; Fax: +1 215 707 6989; Email: betty{at}temple.edu

SWI/SNF complexes are ATP-dependent chromatin remodeling complexes that are highly conserved from yeast to human. From yeast to human the complexes contain a subunit with an ARID (A-T-rich interaction domain) DNA-binding domain. In yeast this subunit is SWI1 and in human there are two closely related alternative subunits, p270 and ARID1B. We describe here a comparison of the DNA-binding properties of the yeast and human SWI/SNF ARID-containing subunits. We have determined that SWI1 is an unusual member of the ARID family in both its ARID sequence and in the fact that its DNA-binding affinity is weaker than that of other ARID family members, including its human counterparts, p270 and ARID1B. Sequence analysis and substitution mutagenesis reveals that the weak DNA-binding affinity of the SWI1 ARID is an intrinsic feature of its sequence, arising from specific variations in the major groove interaction site. In addition, this work confirms the finding that p270 binds DNA without regard to sequence specificity, excluding the possibility that the intrinsic role of the ARID is to recruit SWI/SNF complexes to specific promoter sequences. These results emphasize that care must be taken when comparing yeast and higher eukaryotic SWI/SNF complexes in terms of DNA-binding mechanisms.


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