Volume 23, Issue 1, Pages (January 2015)

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Structural Basis of Substrate Methylation and Inhibition of SMYD2
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Volume 23, Issue 1, Pages 206-215 (January 2015) Discovery of Substrates for a SET Domain Lysine Methyltransferase Predicted by Multistate Computational Protein Design  Sylvain Lanouette, James A. Davey, Fred Elisma, Zhibin Ning, Daniel Figeys, Roberto A. Chica, Jean-François Couture  Structure  Volume 23, Issue 1, Pages 206-215 (January 2015) DOI: 10.1016/j.str.2014.11.004 Copyright © 2015 Elsevier Ltd Terms and Conditions

Structure 2015 23, 206-215DOI: (10.1016/j.str.2014.11.004) Copyright © 2015 Elsevier Ltd Terms and Conditions

Figure 1 Peptide Flexibility in SMYD2 Substrate Binding Cleft (A) Structure of SMYD2 (PDB ID 3S7F) with bound p53 peptide (stick model). SMYD2 residues forming the substrate binding cleft are highlighted in purple. (B) p53 substrate peptide backbones included in the 180-member PertMin ensemble. Amino acid positions relative to the methylated K370 residue are indicated. Crystallographic coordinates of the p53 peptide are shown in gray. (C) Binding interactions between side chains of the p53 peptide and SMYD2 residues forming the binding cleft (purple) and the methyl transfer channel (gray). Two hydrophobic pockets (purple) stabilize the side chains of p53 residues at positions −1 and +2 whereas no interactions stabilize the side chain of the residue at position +1. (D) Binding interactions of the p53 peptide backbone by SMYD2 residues forming the binding cleft (purple) and the methyl transfer channel (gray). Structure 2015 23, 206-215DOI: (10.1016/j.str.2014.11.004) Copyright © 2015 Elsevier Ltd Terms and Conditions

Figure 2 Substrate Recognition Motif of SMYD2 (A) Methylation of a SPOT peptide array containing 200 peptides based on the p53 template sequence in which each position was systematically substituted for every amino acid. Labeling by tritiated methyl was detected by phosphorimaging after incubation with recombinant SMYD2 and 3H-AdoMet. (B) Heat map representation of average methylation intensities measured by phosphorimaging. (C) Analysis of the relative methylation factor for every amino acid at each position of the SPOT arrays (n = 3). (D) Comparison of SMYD2 substrate recognition motifs determined by methyltransferase high-throughput assays (SPOT) and MSD calculations. Green, blue, and black represent hydrophobic, charged, and polar residues, respectively. The methylated K370 residue is indicated with an asterisk. Structure 2015 23, 206-215DOI: (10.1016/j.str.2014.11.004) Copyright © 2015 Elsevier Ltd Terms and Conditions

Figure 3 Comparison of SSD and MSD Predictions (A) MSD fitness values are plotted as a function of SSD scores for a total 55 substitutions found on the p53 peptide at positions −1, +1, and +2 relative to the methylated lysine. The 45 substitutions that resulted in negative (favorable) fitness and score values are shown as circles. The ten substitutions that resulted in negative (favorable) MSD fitness values and positive (unfavorable) SSD scores are shown as triangles. To simplify, these ten sequences are given identical arbitrary positive SSD scores on the plot. (B) ROC curve for all substitutions at all positions obtained using SSD scores. (C) ROC curve for all substitutions at all positions obtained using MSD fitness values. The diagonal line represents random binning. Structure 2015 23, 206-215DOI: (10.1016/j.str.2014.11.004) Copyright © 2015 Elsevier Ltd Terms and Conditions

Figure 4 Prediction of SMYD2 Substrates among Its Interactome (A) Ninety-five proteins reported to interact with SMYD2 include the [LFM]−1-K∗-[AFYMSHRK]+1-[LYK]+2 motif determined from SPOT arrays while 137 include the [LFMK]−1-K∗-[AFMSKC]+1-[KLIM]+2 predicted by MSD. Seventy-three of these proteins contain sequences common to both recognition motifs. (B) Analysis of gene ontology terms associated to the 95 putative SMYD2 targets containing the [LFM]−1-K∗-[AFYMSHRK]+1-[LYK]+2 motif (green). Among the 22 hits corresponding to terms related to SMYD2 functions, localization and phenotypes, 11 include a lysine conserved in humans (Homo sapiens), mice (Mus musculus), frogs (Xenopus laevis), and fish (Danio rerio) (conservation of all sites across two to three species or across all four species is indicated in light or dark blue, respectively). Structure 2015 23, 206-215DOI: (10.1016/j.str.2014.11.004) Copyright © 2015 Elsevier Ltd Terms and Conditions

Figure 5 SIX1, SIX2, SIN3B, and DHX15 Are SMYD2 Substrates (A) Autoradiography of FLAG-tagged proteins incubated with recombinant SMYD2 and 3H-AdoMet transcription factor E2F1, mitogen-activated protein kinase 11 (MAPK11), RNA polymerase II subunit A C-terminal domain phosphatase (FCP1), Staufen 1 (STAU1), DEAD box RNA helicase 5 (DDX5), SIN3B, DEAH box RNA helicase 15 (DHX15), and Sine Oculis Homeobox homolog 1, 2, and 4 (SIX1, SIX2, SIX4). Upper panels show the proteins stained by Coomassie following SDS-PAGE and the lower panels show the resulting autoradiography. Transcription factors SIX1 and SIX2, corepressor SIN3B, and RNA helicase DHX15 are all methylated by SMYD2. (B) Autoradiography of wild-type and mutant SIX1 and SIN3B incubated with recombinant SMYD2 and 3H-AdoMet. Upper and lower panels are as described in (A). (C) Alignment of amino acid sequences surrounding all known SMYD2 methylation sites (black). Residues included in the SMYD2 recognition motif are highlighted in green and those that are not are highlighted in red. (D) Localization of the methylation sites identified by our motif on SIX1, SIX2, SIN3B, and DHX15. Structure 2015 23, 206-215DOI: (10.1016/j.str.2014.11.004) Copyright © 2015 Elsevier Ltd Terms and Conditions