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  • Title: The Swi2/Snf2 bromodomain is important for the full binding and remodeling activity of the SWI/SNF complex on H3- and H4-acetylated nucleosomes.
    Author: Awad S, Hassan AH.
    Journal: Ann N Y Acad Sci; 2008 Sep; 1138():366-75. PubMed ID: 18837912.
    Abstract:
    The SWI/SNF chromatin-remodeling complex contains a bromodomain in its Swi2/Snf2 subunit that helps tether it to acetylated promoter nucleosomes. To study the importance of this bromodomain in the SWI/SNF complex, we have compared the nucleosome-binding and the chromatin-remodeling activities of the SWI/SNF to a mutant complex that lacks the Swi2/Snf2 bromodomain. Here we show that the SWI/SNF complex deleted of the Swi2/Snf2 bromodomain cannot bind to SAGA- or NuA4-acetylated nucleosomes as well as the wild-type complex. Moreover, we show that this reduced binding leads to partial remodeling of these acetylated nucleosome templates by the Deltabromodomain SWI/SNF complex. These results demonstrate that the Swi2/Snf2 bromodomain is required for the full binding and functional activity of the SWI/SNF complex on H3- and H4-acetylated nucleosomes.
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