Structural Basis for the Recognition of Methylated Histone H3K36 by the Eaf3 Subunit of Histone Deacetylase Complex Rpd3S  Chao Xu, Gaofeng Cui, Maria.

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Structural Basis for the Recognition of Methylated Histone H3K36 by the Eaf3 Subunit of Histone Deacetylase Complex Rpd3S  Chao Xu, Gaofeng Cui, Maria Victoria Botuyan, Georges Mer  Structure  Volume 16, Issue 11, Pages 1740-1750 (November 2008) DOI: 10.1016/j.str.2008.08.008 Copyright © 2008 Elsevier Ltd Terms and Conditions

Figure 1 Solution NMR Structures of Eaf3 in the Free State and Linked to Histone H3KC36me2 (A) Left: Stereo view of the 20 lowest-energy structures of Eaf3 chromo barrel domain (1–113 aa) showing only backbone N, Cα, and C′ after superposition of residues 8–41 and 55–111. The rmsd is 0.54 and 1.16 Å for the backbone atoms N, Cα, and C′ and for all heavy atoms of residues 8–41 and 55–111, respectively. Right: Ribbon representation of the lowest-energy structure of Eaf3 chromo barrel domain. The helices (α) and β strands (β) are colored green and blue, respectively. N and C termini are also indicated. (B) Left: Stereo view of the 20 lowest-energy structures of Eaf3-H3KC36me2 (1–134 aa) showing only backbone N, Cα, and C′ after superposition of residues 8–41, 55–111, and 127–130. The Eaf3 chromo barrel domain (1–115 aa) is colored black, while the linker (116–119 aa) and H3KC36me2 (120–134 aa) are shaded blue and orange, respectively. The rmsd is 0.61 and 1.13 Å for the backbone atoms N, Cα, and C′ and for all heavy atoms of residues 8–41, 55–111, and 127–130, respectively. Right: Cartoon representation of the lowest-energy structure of Eaf3-H3KC36me2; ribbon for Eaf3 and stick for a portion of H3KC36me2. The helices (α) and β strands (β) are indicated. Color coding is the same as in (A). Structure 2008 16, 1740-1750DOI: (10.1016/j.str.2008.08.008) Copyright © 2008 Elsevier Ltd Terms and Conditions

Figure 2 Comparison of Eaf3 and MRG15 Chromo Barrel Domains (A) Alignment of Eaf3 and MRG15 amino acids based on their 3D structures. The secondary structure elements are indicated. The alignment was created with ESPript (http://espript.ibcp.fr/ESPript/ESPript/). (B) Superposition of the structures of Eaf3 and MRG15 (PDB accession code 2F5K) chromo barrel domains. (C) Expanded view of the overlaid aromatic methyllysine binding cages of Eaf3-H3KC36me2 and MRG15 (PDB accession code 2F5K). H3KC36me2 from the Eaf3-H3KC36me2-linked complex is shown in yellow. Structure 2008 16, 1740-1750DOI: (10.1016/j.str.2008.08.008) Copyright © 2008 Elsevier Ltd Terms and Conditions

Figure 3 Interactions of Methylated Histone H3 with Eaf3 Chromo Barrel Domain (A) 15N-1H HSQC titration spectra of 15N-labeled Eaf3 (1–113 aa), free (black) and upon addition of increasing amounts of nonlabeled H3K4me3 peptide (1–10 aa). In this and other panels, the side-chain amide atom signals of Trp84 and Trp88 are labeled W84sc and W88sc, respectively. (B) 15N-1H HSQC titration spectra of 15N-labeled Eaf3 (1–113 aa), free (black) and upon addition of increasing amounts of nonlabeled H3K36me3 peptide (31–42 aa). (C) Overlaid 15N-1H HSQC spectra of 15N-labeled Eaf3-H3C36 (1–134 aa) before (black) and after chemical modification Cys128 or H3C36 into a dimethyllysine analog (red). Representative residues of Eaf3, which exhibited strongest perturbations (indicated by arrows) upon addition of the peptides or after dimethylation reaction are labeled in (A), (B), and (C) spectra. (D) Estimates of KD of Eaf3 for H3K4me3 peptide from the change in chemical shifts of selected 1H-15N Eaf3 resonances upon addition of nonlabeled H3K4me3 (1–10 aa). (E) Estimates of KD of Eaf3 for H3K36me3 peptide from the change in chemical shifts of selected 1H-15N Eaf3 resonances upon addition of nonlabeled H3K36me3 (31–42 aa). (F) Portion of the overlaid 15N-1H HSQC spectra of 15N-labeled Eaf3-H3C36 (1–134 aa) before (black) and after alkylation of Cys128 or H3C36 into a dimethyllysine analog (red). Ten resonance signals corresponding to residues of the linked H3KC36me2 sequence are labeled. Structure 2008 16, 1740-1750DOI: (10.1016/j.str.2008.08.008) Copyright © 2008 Elsevier Ltd Terms and Conditions

Figure 4 Details of Eaf3 Chromo Barrel Domain Interaction with the Linked Histone H3KC36me2 Sequence (A) Chemical conversion of a cysteine residue to a dimethyllysine analog (KCme2). (B) Close-up view of the main interaction site within the Eaf3-H3KC36me2 protein. Tyr23, Tyr81, Trp84, and Trp88 of the chromo barrel domain of Eaf3 form an aromatic cage that accommodates the linked dimethylated lysine analog of H3K36. Other residues (Leu21 and Lys85 of Eaf3; and V35 and Pro38 of linked H3KC36me2) involved in the interaction are also labeled. (C) Planes from the 3D 15N nuclear Overhauser effect spectroscopy (NOESY) experiment showing NOE correlations of W88HE1 of Eaf3 to KC36me2, Lys37, and Pro38 of linked H3KC36me2 (left); and 13C-edited NOESY experiments showing NOE correlations of W88HE3 of Eaf3 to KC36me2, Lys37, and Pro38 of linked H3KC36me2 (middle), and NOE correlations of the HD protons of P38 of linked H3KC36me2 to the aromatic protons of Trp84 and Trp88 of Eaf3 (right). (D) Stereo view of the superposition of 10 NMR structures each of free Eaf3 (blue) and Eaf3-H3KC36me2 complex (Eaf3 in green and H3KC36me2 in orange) showing a close-up representation of the aromatic pocket binding site. Structure 2008 16, 1740-1750DOI: (10.1016/j.str.2008.08.008) Copyright © 2008 Elsevier Ltd Terms and Conditions

Figure 5 Interactions of Eaf3 Chromo Barrel Domain with Trimethylated Histone H4K20, Trimethylated Lysine and Dimethylated Arginine (A) 15N-1H HSQC titration spectra of 15N-labeled Eaf3 (1–113 aa), free (black), and upon addition of increasing amounts of nonlabeled H4K20me3 peptide (16–25 aa). In this and other panels, the side chain amide atom signals of Trp84 and Trp88 are labeled W84sc and W88sc, respectively. (B) 15N-1H HSQC titration spectra of 15N-labeled Eaf3 (1–113 aa), free (black), and upon addition of increasing amounts of trimethylated lysine. (C) Estimates of KD of Eaf3 for H4K20me3 peptide from the change in chemical shifts of selected 1H-15N Eaf3 resonances upon addition of nonlabeled H4K20me3 (16–25 aa). (D) Estimates of KD of Eaf3 for trimethylated lysine from the change in chemical shifts of selected 1H-15N Eaf3 resonances upon addition of nonlabeled trimethylated lysine. (E) 15N-1H HSQC titration spectra of 15N-labeled Eaf3 (1–113 aa), free (black), and upon addition of increasing amounts of symmetrically dimethylated arginine up to ∼7-fold excess. (F) 15N-1H HSQC titration spectra of 15N-labeled Eaf3 (1–113 aa), free (black), and upon addition of increasing amounts of asymmetrically dimethylated arginine up to ∼7-fold excess. Structure 2008 16, 1740-1750DOI: (10.1016/j.str.2008.08.008) Copyright © 2008 Elsevier Ltd Terms and Conditions