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Title: A D53 repression motif induces oligomerization of TOPLESS corepressors and promotes assembly of a corepressor-nucleosome complex

Journal Article · · Science Advances

TOPLESS are tetrameric plant corepressors of the conserved Tup1/Groucho/TLE (transducin-like enhancer of split) family. Herein, we show that they interact through their TOPLESS domains (TPDs) with two functionally important ethylene response factor–associated amphiphilic repression (EAR) motifs of the rice strigolactone signaling repressor D53: the universally conserved EAR-3 and the monocot-specific EAR-2. We present the crystal structure of the monocot-specific EAR-2 peptide in complex with the TOPLESS-related protein 2 (TPR2) TPD, in which the EAR-2 motif binds the same TPD groove as jasmonate and auxin signaling repressors but makes additional contacts with a second TPD site to mediate TPD tetramer-tetramer interaction. We validated the functional relevance of the two TPD binding sites in reporter gene assays and in transgenic rice and demonstrate that EAR-2 binding induces TPD oligomerization. Moreover, we demonstrate that the TPD directly binds nucleosomes and the tails of histones H3 and H4. Higher-order assembly of TPD complexes induced by EAR-2 binding markedly stabilizes the nucleosome-TPD interaction. These results establish a new TPD-repressor binding mode that promotes TPD oligomerization and TPD-nucleosome interaction, thus illustrating the initial assembly of a repressor-corepressor-nucleosome complex.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
Outstanding Young Scientist Foundation of Chinese Academy of Sciences (CAS); Youth Innovation Promotion Association of Chinese Academy of Sciences (CAS); Van Andel Research Institute; Ministry of Science and Technology (China); National Science Foundation (NSF); National Institutes of Health (NIH); Michigan Economic Development Corporation; Michigan Technology Tri-Corridor; USDOE Office of Science (SC)
Grant/Contract Number:
AC02-06CH11357; 2012ZX09301001, 2012CB910403; 2013CB910600; XDB08020303; 2013ZX09507001; 91217311; DK071662; GM102545; GM104212; CA181343; 085P1000817
OSTI ID:
1438874
Journal Information:
Science Advances, Vol. 3, Issue 6; ISSN 2375-2548
Publisher:
AAASCopyright Statement
Country of Publication:
United States
Language:
ENGLISH
Citation Metrics:
Cited by: 51 works
Citation information provided by
Web of Science

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The TIE1 transcriptional repressor controls shoot branching by directly repressing BRANCHED1 in Arabidopsis journal March 2018
OBERON3 and SUPPRESSOR OF MAX2 1-LIKE proteins form a regulatory module specifying phloem identity posted_content October 2021
From carotenoids to strigolactones journal December 2017
Largely additive effects of gibberellin and strigolactone on gene expression in Arabidopsis thaliana seedlings journal November 2017
PlantEAR: Functional Analysis Platform for Plant EAR Motif-Containing Proteins journal November 2018
Accelerating structure‐function mapping using the ViVa webtool to mine natural variation journal July 2019
IPA1 functions as a downstream transcription factor repressed by D53 in strigolactone signaling in rice journal August 2017
SUPPRESSOR OF MAX2 1‐LIKE 5 promotes secondary phloem formation during radial stem growth journal January 2020
Drought Response in Wheat: Key Genes and Regulatory Mechanisms Controlling Root System Architecture and Transpiration Efficiency journal December 2017
Molecular evolution and diversification of the SMXL gene family journal March 2018
Strigolactone promotes cytokinin degradation through transcriptional activation of CYTOKININ OXIDASE/DEHYDROGENASE 9 in rice journal June 2019
Structural plasticity of D3-D14 ubiquitin ligase in strigolactone signalling. text January 2018
Triazole ureas covalently bind to strigolactone receptors and regulate signaling posted_content July 2018
Molecular basis of strigolactone perception in root-parasitic plants: aiming to control its germination with strigolactone agonists/antagonists journal October 2019
Fellowship of the rings: a saga of strigolactones and other small signals journal September 2019
Structural plasticity of D3–D14 ubiquitin ligase in strigolactone signalling journal November 2018

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