3RSN

Crystal Structure of the N-terminal region of Human Ash2L

• PDB DOI: https://doi.org/10.2210/pdb3RSN/pdb

• Classification: TRANSCRIPTION
• Organism(s): Homo sapiens
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2011-05-02 Released: 2011-06-22 
• Deposition Author(s): Chen, Y., Wan, B., Wang, K.C., Cao, F., Yang, Y., Protacio, A., Dou, Y., Chang, H.Y., Lei, M.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.10 Å
• R-Value Free: 0.254 
• R-Value Work: 0.213 
• R-Value Observed: 0.217 

Literature

Crystal structure of the N-terminal region of human Ash2L shows a winged-helix motif involved in DNA binding.

Chen, Y., Wan, B., Wang, K.C., Cao, F., Yang, Y., Protacio, A., Dou, Y., Chang, H.Y., Lei, M.

(2011) EMBO Rep 12: 797-803

• PubMed: 21660059 
• DOI: https://doi.org/10.1038/embor.2011.101
• Primary Citation of Related Structures:  
  3RSN


• PubMed Abstract: 
  

  Ash2L is a core component of the MLL family histone methyltransferases and has an important role in regulating the methylation of histone H3 on lysine 4. Here, we report the crystal structure of the N-terminal domain of Ash2L and reveal a new function of Ash2L. The structure shows that Ash2L contains an atypical PHD finger that does not have histone tail-binding activity. Unexpectedly, the structure shows a previously unrecognized winged-helix motif that directly binds to DNA. The DNA-binding-deficient mutants of Ash2L reduced Ash2L localization to the HOX locus. Strikingly, a single mutation in Ash2L(WH) (K131A) breaks the chromatin domain boundary, suggesting that Ash2L also has a role in chromosome demarcation.

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Organizational Affiliation: 

Howard Hughes Medical Institute, 1150 West, Medical Center Drive, Ann Arbor, Michigan 48109, USA.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 20.69 kDa 
• Atom Count: 1,412 
• Modelled Residue Count: 165 
• Deposited Residue Count: 177 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Set1/Ash2 histone methyltransferase complex subunit ASH2	A	177	Homo sapiens	Mutation(s): 0  Gene Names: ASH2L, ASH2L1
UniProt & NIH Common Fund Data Resources
Find proteins for Q9UBL3 (Homo sapiens) Explore Q9UBL3  Go to UniProtKB:  Q9UBL3
PHAROS:  Q9UBL3 GTEx:  ENSG00000129691

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
ZN	B [auth A]	ZINC ION Zn PTFCDOFLOPIGGS-UHFFFAOYSA-N

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
MSE	A	L-PEPTIDE LINKING	C5 H11 N O2 Se		MET

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.10 Å
• R-Value Free: 0.254 
• R-Value Work: 0.213 
• R-Value Observed: 0.217 
• Space Group: P 3₁ 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 49.984	α = 90
b = 49.984	β = 90
c = 165.519	γ = 120

Software Package:

Software Name	Purpose
MD2	data collection
SHARP	phasing
PHENIX	refinement
HKL-2000	data reduction
HKL-2000	data scaling

Structure Validation

Entry History 

Deposition Data

• Released Date: 2011-06-22 
Deposition Author(s): Chen, Y., Wan, B., Wang, K.C., Cao, F., Yang, Y., Protacio, A., Dou, Y., Chang, H.Y., Lei, M.

Revision History  

• Version 1.0: 2011-06-22
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Version format compliance
• Version 1.2: 2011-12-14
  Changes: Database references