Regulation of jasmonate signaling by reversible acetylation of TOPLESS in Arabidopsis  

作　　者：Chunpeng An Lei Deng Huawei Zhai Yanrong You Fangming Wu Qingzhe Zhai Alain Goossens Chuanyou Li 

机构地区：[1]State Key Laboratory of Plant Genomics,National Center for Plant Gene Research(Beijing),Institute of Genetics and Developmental Biology,Innovation Academy of Seed Design,Chinese Academy of Sciences,Beijing 100101,China [2]CAS Center for Excellence in Biotic Interactions,University of Chinese Academy of Sciences,Beijing 100049,China [3]State Key Laboratory of Crop Biology,College of Horticulture Science and Engineering,Shandong Agricultural University,Tai'an 271018,China [4]Department of Plant Biotechnology and Bioinformatics,Ghent University,Technologiepark 71,9052 Ghent,Belgium [5]VIB Center for Plant Systems Biology,Technologiepark 71,9052 Ghent,Belgium

出　　处：《Molecular Plant》2022年第8期1329-1346,共18页分子植物（英文版）

基　　金：This work was supported by the founding from National Natural Science Foundationof China(32161133018,31730010,31991183,31900243);the Strategic Priority Research Program of theCAS(XDPB16);C.A.was supported by the National Postdoctoral Program for Innovative Talents(BX20180355);the postdoctoral fellowship from China PostdoctoralScienceFoundation.

摘　　要：The plant hormone jasmonate(JA)regulates plant immunity and adaptive growth by orchestrating a genome-wide transcriptional program.Key regulators of JA-responsive gene expression include the master transcription factor MYc2,which is repressed by the conserved Groucho/Tup1-like corepressor TOPLESS(TPL)in the resting state.However,the mechanisms underlying TPL-mediated transcriptional repression of MYc2 activity and hormone-dependent switching between repression and de-repression remainenigmatic.Here,we report the regulation of TPLactivity and JAsignaling byreversibleacetylation of TPL.We found that the histone acetyltransferase GCN5 could mediate TPL acetylation,which enhances its interaction with the NOVEL-INTERACTOR-OF-JAZ(NINJA)adaptor and promotes its recruitment to MYc2 target promoters,facilitating transcriptional repression.Conversely,TPL deacetylation by the histonedeacetylase HDA6 weakens TPL-NINJA interaction and inhibitsTPL recruitmentto MYC2 target promoters,facilitating transcriptional activation.In the resting state,the opposing activities of GCN5 and HDA6 maintain TPL acetylation homeostasis,promoting transcriptional repression activity of TPL.In response to JA elicitation,HDA6 expression is transiently induced,resulted in decreased TPL acetylation and repressor activity,thereby transcriptional activation of MYC2 target genes.Thus,the GCN5-TPL-HDA6 module main tains the homeostasis of acetylated TPL,thereby determining the transcriptional state of JA-responsive genes.Our findings uncovered a mechanism by which the TPL corepressor activity in JA signaling is activelytuned inarapidandreversiblemanner.

关 键 词：jasmonate signaling transcriptional repression TOPLESS corepressor GCN5 HDA6 ACETYLATION 

分 类 号：Q94[生物学—植物学]