4PLI

Structure of the chromodomain of MRG2 in complex with H3K36me3


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.65 Å
  • R-Value Free: 0.230 
  • R-Value Work: 0.210 
  • R-Value Observed: 0.212 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Regulation of arabidopsis flowering by the histone mark readers MRG1/2 via interaction with CONSTANS to modulate FT expression.

Bu, Z.Yu, Y.Li, Z.Liu, Y.Jiang, W.Huang, Y.Dong, A.W.

(2014) PLoS Genet 10: e1004617-e1004617

  • DOI: 10.1371/journal.pgen.1004617
  • Primary Citation of Related Structures:  
    4PLI, 4PLL, 4PL6

  • PubMed Abstract: 
  • Day-length is important for regulating the transition to reproductive development (flowering) in plants. In the model plant Arabidopsis thaliana, the transcription factor CONSTANS (CO) promotes expression of the florigen FLOWERING LOCUS T (FT), constituting a key flowering pathway under long-day photoperiods ...

    Day-length is important for regulating the transition to reproductive development (flowering) in plants. In the model plant Arabidopsis thaliana, the transcription factor CONSTANS (CO) promotes expression of the florigen FLOWERING LOCUS T (FT), constituting a key flowering pathway under long-day photoperiods. Recent studies have revealed that FT expression is regulated by changes of histone modification marks of the FT chromatin, but the epigenetic regulators that directly interact with the CO protein have not been identified. Here, we show that the Arabidopsis Morf Related Gene (MRG) group proteins MRG1 and MRG2 act as H3K4me3/H3K36me3 readers and physically interact with CO to activate FT expression. In vitro binding analyses indicated that the chromodomains of MRG1 and MRG2 preferentially bind H3K4me3/H3K36me3 peptides. The mrg1 mrg2 double mutant exhibits reduced mRNA levels of FT, but not of CO, and shows a late-flowering phenotype under the long-day but not short-day photoperiod growth conditions. MRG2 associates with the chromatin of FT promoter in a way dependent of both CO and H3K4me3/H3K36me3. Vice versa, loss of MRG1 and MRG2 also impairs CO binding at the FT promoter. Crystal structure analyses of MRG2 bound with H3K4me3/H3K36me3 peptides together with mutagenesis analysis in planta further demonstrated that MRG2 function relies on its H3K4me3/H3K36me3-binding activity. Collectively, our results unravel a novel chromatin regulatory mechanism, linking functions of MRG1 and MRG2 proteins, H3K4/H3K36 methylations, and CO in FT activation in the photoperiodic regulation of flowering time in plants.


    Organizational Affiliation

    State Key Laboratory of Genetic Engineering, Collaborative Innovation Center for Genetics and Development, Institute of Plant Biology, School of Life Sciences, Fudan University, Shanghai, China.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
At1g02740A, B75Arabidopsis thalianaMutation(s): 0 
Gene Names: At1g02740MRG2F22D16.25
UniProt
Find proteins for Q4V3E2 (Arabidopsis thaliana)
Explore Q4V3E2 
Go to UniProtKB:  Q4V3E2
Protein Feature View
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  • Reference Sequence
  • Find similar proteins by:  Sequence   |   Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
H3K36me3C, D11Arabidopsis thalianaMutation(s): 0 
Gene Names: HTR4At4g40030T5J17.200HTR5At4g40040T5J17.210HTR8At5g10980T30N20_250T5K6.6
UniProt
Find proteins for P59169 (Arabidopsis thaliana)
Explore P59169 
Go to UniProtKB:  P59169
Protein Feature View
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  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
M3L
Query on M3L
C, DL-PEPTIDE LINKINGC9 H21 N2 O2LYS
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.65 Å
  • R-Value Free: 0.230 
  • R-Value Work: 0.210 
  • R-Value Observed: 0.212 
  • Space Group: P 65
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 54.325α = 90
b = 54.325β = 90
c = 127.785γ = 120
Software Package:
Software NamePurpose
PHENIXrefinement

Structure Validation

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Entry History 

Deposition Data

  • Deposited Date: 2014-05-18 
  • Released Date: 2015-07-22 
  • Deposition Author(s): Liu, Y., Huang, Y.

Revision History  (Full details and data files)

  • Version 1.0: 2015-07-22
    Type: Initial release
  • Version 1.1: 2015-11-04
    Changes: Experimental preparation
  • Version 1.2: 2016-05-04
    Changes: Database references