Cooperative DNA and histone binding by Uhrf2 links the two major repressive epigenetic pathways.
Bottom Line: Besides the cooperative DNA and histone binding that is characteristic for Uhrf2, we also found an opposite expression pattern of uhrf1 and uhrf2 during differentiation.Ectopic expression of Uhrf2 in uhrf1(-/-) embryonic stem cells did not restore DNA methylation at major satellites indicating functional differences.We propose that the cooperative interplay of Uhrf2 domains may contribute to a tighter epigenetic control of gene expression in differentiated cells.
Affiliation: Ludwig Maximilians University Munich, Department of Biology II and Center for Integrated Protein Science Munich, Großhaderner Str. 2, 82152 Planegg-Martinsried, Germany.Show MeSH
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Mentions: Recently, several studies showed multivalent binding to histone-tail peptides [Ruthenburg et al., 2007]. In case of Uhrf1 and Uhrf2, the TTD is followed by a second histone-tail binding domain, a PHD domain (Fig. 1A). As the isolated PHD domains of Uhrf1 and Uhrf2 did not show binding to H3 histone-tail peptides (Fig. 2B) [Rottach et al., 2010], we tested whether the combination of the PHD and the TTD results in cooperative histone-tail binding. Surprisingly, the combined TTD–PHD domain of Uhrf2 displayed a fourfold increased binding to H3K9me2/me3 in comparison to the single TTD, which was not observed for the corresponding construct of Uhrf1 (Figs. .2B and 4A).
Affiliation: Ludwig Maximilians University Munich, Department of Biology II and Center for Integrated Protein Science Munich, Großhaderner Str. 2, 82152 Planegg-Martinsried, Germany.