Reference: Syntichaki P, et al. (2000) The Gcn5 bromodomain co-ordinates nucleosome remodelling. Nature 404(6776):414-7

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Abstract


The access of transcription factors to eukaryotic promoters often requires modification of their chromatin structure, which is accomplished by the action of two general classes of multiprotein complexes. One class contains histone acetyltransferases (HATs), such as Gcn5 in the SAGA complex, which acetylate nucleosomal histones. The second class contains ATPases, such as Swi2 in the Swi/Snf complex, which provide the energy for nucleosome remodelling. In several promoters these two complexes cooperate but their functional linkage is unknown. A protein module that is present in all nuclear HATs, the bromodomain, could provide such a link. The recently reported in vitro binding of a HAT bromodomain with acetylated lysines within H3 and H4 amino-terminal peptides indicates that this interaction may constitute a targeting step for events that follow histone acetylation. Here we use a suitable promoter to show that bromodomain residues essential for acetyl-lysine binding are not required in vivo for Gcn5-mediated histone acetylation but are fundamental for the subsequent Swi2-dependent nucleosome remodelling and consequent transcriptional activation. We show that the Gcn5 bromodomain stabilizes the Swi/Snf complex on this promoter.

Reference Type
Journal Article | Research Support, Non-U.S. Gov't
Authors
Syntichaki P, Topalidou I, Thireos G
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