Solution NMR Structure and Histone Binding of the PHD Domain of Human MLL5.
Related Articles Solution NMR Structure and Histone Binding of the PHD Domain of Human MLL5.
PLoS One. 2013;8(10):e77020
Authors: Lemak A, Yee A, Wu H, Yap D, Zeng H, Dombrovski L, Houliston S, Aparicio S, Arrowsmith CH
Abstract
Mixed Lineage Leukemia 5 (MLL5) is a histone methyltransferase that plays a key role in hematopoiesis, spermatogenesis and cell cycle progression. In addition to its catalytic domain, MLL5 contains a PHD finger domain, a protein module that is often involved in binding to the N-terminus of histone H3. Here we report the NMR solution structure of the MLL5 PHD domain showing a variant of the canonical PHD fold that combines conserved H3 binding features from several classes of other PHD domains (including an aromatic cage) along with a novel C-terminal ?-helix, not previously seen. We further demonstrate that the PHD domain binds with similar affinity to histone H3 tail peptides di- and tri-methylated at lysine 4 (H3K4me2 and H3K4me3), the former being the putative product of the MLL5 catalytic reaction. This work establishes the PHD domain of MLL5 as a bone fide 'reader' domain of H3K4 methyl marks suggesting that it may guide the spreading or further methylation of this site on chromatin.
PMID: 24130829 [PubMed - as supplied by publisher]
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