3VEM

Structural basis of transcriptional gene silencing mediated by Arabidopsis MOM1


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.2 Å
  • R-Value Free: 0.293 
  • R-Value Work: 0.258 

wwPDB Validation 3D Report Full Report


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Literature

Structural Basis of Transcriptional Gene Silencing Mediated by Arabidopsis MOM1.

Nishimura, T.Molinard, G.Petty, T.J.Broger, L.Gabus, C.Halazonetis, T.D.Thore, S.Paszkowski, J.

(2012) PLOS GENET. 8: e1002484-e1002484

  • DOI: 10.1371/journal.pgen.1002484

  • PubMed Abstract: 
  • Shifts between epigenetic states of transcriptional activity are typically correlated with changes in epigenetic marks. However, exceptions to this rule suggest the existence of additional, as yet uncharacterized, layers of epigenetic regulation. MOM ...

    Shifts between epigenetic states of transcriptional activity are typically correlated with changes in epigenetic marks. However, exceptions to this rule suggest the existence of additional, as yet uncharacterized, layers of epigenetic regulation. MOM1, a protein of 2,001 amino acids that acts as a transcriptional silencer, represents such an exception. Here we define the 82 amino acid domain called CMM2 (Conserved MOM1 Motif 2) as a minimal MOM1 fragment capable of transcriptional regulation. As determined by X-ray crystallography, this motif folds into an unusual hendecad-based coiled-coil. Structure-based mutagenesis followed by transgenic complementation tests in plants demonstrate that CMM2 and its dimerization are effective for transcriptional suppression at chromosomal loci co-regulated by MOM1 and the siRNA pathway but not at loci controlled by MOM1 in an siRNA-independent fashion. These results reveal a surprising separation of epigenetic activities that enable the single, large MOM1 protein to coordinate cooperating mechanisms of epigenetic regulation.


    Organizational Affiliation

    Department of Plant Biology, University of Geneva, Geneva, Switzerland.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Helicase protein MOM1
A, B, C, D
115Arabidopsis thalianaMutation(s): 0 
Gene Names: MOM1 (MOM)
EC: 3.6.4.-
Find proteins for Q9M658 (Arabidopsis thaliana)
Go to UniProtKB:  Q9M658
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.2 Å
  • R-Value Free: 0.293 
  • R-Value Work: 0.258 
  • Space Group: P 31 2 1
Unit Cell:
Length (Å)Angle (°)
a = 85.640α = 90.00
b = 85.640β = 90.00
c = 292.740γ = 120.00
Software Package:
Software NamePurpose
SHARPphasing
ADSCdata collection
PHENIXrefinement
XSCALEdata scaling
XDSdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-03-07
    Type: Initial release