Solution structure of the ASHH2 CW domain with the N-terminal histone H3 tail mimicking peptide monomethylated on lysine 4

Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 20 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

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This is version 1.3 of the entry. See complete history


The Arabidopsis (ASHH2) CW domain binds monomethylated K4 of the histone H3 tail through conformational selection.

Dobrovolska, O.Brilkov, M.Madeleine, N.Odegard-Fougner, O.Stromland, O.Martin, S.R.De Marco, V.Christodoulou, E.Teigen, K.Isaksson, J.Underhaug, J.Reuter, N.Aalen, R.B.Aasland, R.Halskau, O.

(2020) FEBS J 287: 4458-4480

  • DOI: https://doi.org/10.1111/febs.15256
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Chromatin post-translational modifications are thought to be important for epigenetic effects on gene expression. Methylation of histone N-terminal tail lysine residues constitutes one of many such modifications, executed by families of histone lysine methyltransferase (HKMTase). One such protein is ASHH2 from the flowering plant Arabidopsis thaliana, equipped with the interaction domain, CW, and the HKMTase domain, SET. The CW domain of ASHH2 is a selective binder of monomethylation at lysine 4 on histone H3 (H3K4me1) and likely helps the enzyme dock correctly onto chromatin sites. The study of CW and related interaction domains has so far been emphasizing lock-key models, missing important aspects of histone-tail CW interactions. We here present an analysis of the ASHH2 CW-H3K4me1 complex using NMR and molecular dynamics, as well as mutation and affinity studies of flexible coils. β-augmentation and rearrangement of coils coincide with changes in the flexibility of the complex, in particular the η1, η3 and C-terminal coils, but also in the β1 and β2 strands and the C-terminal part of the ligand. Furthermore, we show that mutating residues with outlier dynamic behaviour affect the complex binding affinity despite these not being in direct contact with the ligand. Overall, the binding process is consistent with conformational selection. We propose that this binding mechanism presents an advantage when searching for the correct post-translational modification state among the highly modified and flexible histone tails, and also that the binding shifts the catalytic SET domain towards the nucleosome. DATABASES: Structural data are available in the PDB database under the accession code 6QXZ. Resonance assignments for CW42 in its apo- and holo-forms are available in the BMRB database under the accession code 27251.

  • Organizational Affiliation

    Department of Biological Sciences, University of Bergen, Norway, Bergen.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Histone-lysine N-methyltransferase ASHH279Arabidopsis thalianaMutation(s): 0 
Gene Names: ASHH2EFSLAZ2SDG8SET8At1g77300T14N5.15
Find proteins for Q2LAE1 (Arabidopsis thaliana)
Explore Q2LAE1 
Go to UniProtKB:  Q2LAE1
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ2LAE1
Sequence Annotations
  • Reference Sequence

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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
ALA-ARG-THR-MLZ-GLN-THR-ALA-ARG-TYR9Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for P68431 (Homo sapiens)
Explore P68431 
Go to UniProtKB:  P68431
PHAROS:  P68431
Entity Groups  
UniProt GroupP68431
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
ZN (Subject of Investigation/LOI)
Query on ZN

Download Ideal Coordinates CCD File 
C [auth A]ZINC ION
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
Query on MLZ
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 20 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Research Council of NorwayNorway226244/F50

Revision History  (Full details and data files)

  • Version 1.0: 2019-12-04
    Type: Initial release
  • Version 1.1: 2020-12-16
    Changes: Database references, Derived calculations
  • Version 1.2: 2020-12-23
    Changes: Database references
  • Version 1.3: 2023-06-14
    Changes: Database references, Other