title: The PHD-finger module of the Arabidopsis thaliana defense regulator EDM2 can recognize triply modified histone H3 peptides.
abstract: Recently we reported that the Arabidopsis thaliana PHD-finger protein EDM2 (enhanced downy mildew 2) impacts disease resistance by affecting levels of di-methylated lysine 9 of histone H3 (H3K9me2) at an alternative polyadenylation site in the immune receptor gene RPP7. EDM2-dependent modulation of this post-translational histone modification (PHM) shifts the balance between full-length RPP7 transcripts and prematurely polyadenylated transcripts, which do not encode the RPP7 protein. Our previous work genetically linked, for the first time, PHMs to alternative polyadenylation and established EDM2 as a critical component mediating PHM-dependent polyadenylation control. However, how EDM2 is recruited to its genomic target sites and how it affects H3K9me2 levels is unknown. Here we show the PHD-finger module of EDM2 to recognize histone H3 bearing certain combinations of 3 distinct PHMs. Our results suggest that targeting of EDM2 to specific genomic regions is mediated by the histone-binding selectivity of its PHD-finger domain.
authors.affiliation: a Institute for Integrative Genome Biology; Center for Plant Cell Biology; Department of Botany and Plant Sciences; University of California at Riverside; Riverside, CA USA.
authors.forename: Tokuji
authors.initials: T
authors.lastname: Tsuchiya
authors.forename: Thomas
authors.initials: T
authors.lastname: Eulgem
mesh_terms: D000595:Amino Acid Sequence; D017360:Arabidopsis / Q000235:genetics* / Q000378:metabolism; D029681:Arabidopsis Proteins / Q000378:metabolism*; D060467:Disease Resistance / Q000235:genetics*; D004926:Escherichia coli; D018506:Gene Expression Regulation, Plant; D006657:Histones / Q000378:metabolism*; D008239:Lysine / Q000378:metabolism; D008745:Methylation; D010455:Peptides / Q000378:metabolism*; D011485:Protein Binding; D011499:Protein Processing, Post-Translational; D014157:Transcription Factors / Q000378:metabolism*; D014158:Transcription, Genetic; D016335:Zinc Fingers
chemical_list: D029681:Arabidopsis Proteins; C523205:EDM2 protein, Arabidopsis; D006657:Histones; D010455:Peptides; C523204:RPP7 protein, Arabidopsis; D014157:Transcription Factors; D008239:Lysine
keywords: Arabidopsis thaliana; EDM2; PHD-finger; RPP7; histone methylation