Biological Assembly 1  

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

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 48.03 kDa 
• Atom Count: 3,137 
• Modelled Residue Count: 371 
• Deposited Residue Count: 415 
• Unique protein chains: 1

 2H4R

Crystal structure of wildtype MENT in the native conformation

• PDB DOI: 10.2210/pdb2H4R/pdb

• Classification: HYDROLASE INHIBITOR
• Organism(s): Gallus gallus
• Expression System: Escherichia coli BL21
• Mutation(s): No 


• Deposited: 2006-05-25 Released: 2006-07-18 
• Deposition Author(s): Irving, J.A., Whisstock, J.C., Buckle, A.M., McGowan, S.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.70 Å
• R-Value Free: 0.282 
• R-Value Work: 0.205 

Literature

X-ray crystal structure of MENT: evidence for functional loop-sheet polymers in chromatin condensation.

McGowan, S., Buckle, A.M., Irving, J.A., Ong, P.C., Bashtannyk-Puhalovich, T.A., Kan, W.T., Henderson, K.N., Bulynko, Y.A., Popova, E.Y., Smith, A.I., Bottomley, S.P., Rossjohn, J., Grigoryev, S.A., Pike, R.N., Whisstock, J.C.

(2006) EMBO J 25: 3144-3155

• PubMed: 16810322 
• DOI: 10.1038/sj.emboj.7601201
• Primary Citation of Related Structures:  
  2DUT, 2H4P, 2H4Q, 2H4R


• PubMed Abstract: 
  

Most serpins are associated with protease inhibition, and their ability to form loop-sheet polymers is linked to conformational disease and the human serpinopathies. Here we describe the structural and functional dissection of how a unique serpin, the non-histone architectural protein, MENT (Myeloid and Erythroid Nuclear Termination stage-specific protein), participates in DNA and chromatin condensation. Our data suggest that MENT contains at least two distinct DNA-binding sites, consistent with its simultaneous binding to the two closely juxtaposed linker DNA segments on a nucleosome. Remarkably, our studies suggest that the reactive centre loop, a region of the MENT molecule essential for chromatin bridging in vivo and in vitro, is able to mediate formation of a loop-sheet oligomer. These data provide mechanistic insight into chromatin compaction by a non-histone architectural protein and suggest how the structural plasticity of serpins has adapted to mediate physiological, rather than pathogenic, loop-sheet linkages.

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Organizational Affiliation: 

Department of Biochemistry and Molecular Biology, Monash University, Clayton, Victoria, Australia.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Heterochromatin-associated protein MENT	A	415	Gallus gallus	Mutation(s): 0  Gene Names: ment-1, SERPINB10, MENT
UniProt
Find proteins for O73790 (Gallus gallus) Explore O73790  Go to UniProtKB:  O73790

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.70 Å
• R-Value Free: 0.282 
• R-Value Work: 0.205 
• Space Group: P 1 2₁ 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 46.203	α = 90
b = 74.022	β = 95.42
c = 57.505	γ = 90

Software Package:

Software Name	Purpose
SCALEPACK	data scaling
REFMAC	refinement
PDB_EXTRACT	data extraction
ADSC	data collection
MOLREP	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 2006-07-18 
Deposition Author(s): Irving, J.A., Whisstock, J.C., Buckle, A.M., McGowan, S.

Revision History  

• Version 1.0: 2006-07-18
  Type: Initial release
  
• Version 1.1: 2008-05-01
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Advisory, Refinement description, Version format compliance