WD40 repeat proteins have been shown to bind the histone H3 tail at the center of their beta-propeller structure. In contrast, in this issue of Genes & Development, Song and colleagues (pp. 1313-1318) demonstrate that the WD40 repeat protein p55 binds a structured region of H4 through a novel binding pocket on the side of beta-propeller, illustrating a diversity of histone recognition by WD40 repeat proteins.
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