2X8B

Crystal structure of human acetylcholinesterase inhibited by aged tabun and complexed with fasciculin-II

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.95 Å
  • R-Value Free: 0.253 
  • R-Value Work: 0.183 
  • R-Value Observed: 0.187 

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This is version 1.5 of the entry. See complete history. 


Literature

Structural evidence that human acetylcholinesterase inhibited by tabun ages through O-dealkylation.

Carletti, E., Colletier, J.P., Dupeux, F., Trovaslet, M., Masson, P., Nachon, F.

(2010) J Med Chem 53: 4002-4008

  • DOI: 10.1021/jm901853b
  • Primary Citation of Related Structures:  
    2X8B

  • PubMed Abstract: 

    • Tabun is a warfare agent that inhibits human acetylcholinesterase (hAChE) by rapid phosphylation of the catalytic serine. A time-dependent reaction occurs on the tabun adduct, leading to an "aged" enzyme, resistant to oxime reactivators. The aging reaction may proceed via either dealkylation or deamidation, depending on the stereochemistry of the phosphoramidyl adduct ...

    Tabun is a warfare agent that inhibits human acetylcholinesterase (hAChE) by rapid phosphylation of the catalytic serine. A time-dependent reaction occurs on the tabun adduct, leading to an "aged" enzyme, resistant to oxime reactivators. The aging reaction may proceed via either dealkylation or deamidation, depending on the stereochemistry of the phosphoramidyl adduct. We solved the X-ray structure of aged tabun-hAChE complexed with fasciculin II, and we show that aging proceeds through O-dealkylation, in agreement with the aging mechanism that we determined for tabun-inhibited human butyrylcholinesterase and mouse acetylcholinesterase. Noteworthy, aging and binding of fasciculin II lead to an improved thermostability, resulting from additional stabilizing interactions between the two subdomains that face each other across the active site gorge. This first structure of hAChE inhibited by a nerve agent provides structural insight into the inhibition and aging mechanisms and a structural template for the design of molecules capable of reactivating aged hAChE.

    Organizational Affiliation: 

    Laboratoire de Biophysique Moléculaire, Institut de Biologie Structurale (CEA-CNRS-UJF), Grenoble, France.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
ACETHYLCHOLINESTERASEA583Homo sapiensMutation(s): 0 
Gene Names: ACHE
EC: 3.1.1.7
UniProt & NIH Common Fund Data Resources
Find proteins for P22303 (Homo sapiens)
Explore P22303 
Go to UniProtKB:  P22303
PHAROS:  P22303
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP22303
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
FASCICULIN-2B61Dendroaspis angusticepsMutation(s): 0 
UniProt
Find proteins for P0C1Z0 (Dendroaspis angusticeps)
Explore P0C1Z0 
Go to UniProtKB:  P0C1Z0
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0C1Z0
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NAG
Query on NAG
Download Ideal Coordinates CCD File 
L [auth A],
M [auth A]		2-acetamido-2-deoxy-beta-D-glucopyranose
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N		 Ligand Interaction
SO4
Query on SO4
Download Ideal Coordinates CCD File 
I [auth A]SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L		 Ligand Interaction
CL
Query on CL
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C [auth A],
D [auth A],
E [auth A],
F [auth A],
G [auth A],
C [auth A],
D [auth A],
E [auth A],
F [auth A],
G [auth A],
H [auth A],
N [auth A],
O [auth A],
P [auth A],
Q [auth A],
R [auth A]
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M		 Ligand Interaction
UNX
Query on UNX
Download Ideal Coordinates CCD File 
J [auth A],
K [auth A],
S [auth A]		UNKNOWN ATOM OR ION
X
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
SEN
Query on SEN		A L-PEPTIDE LINKINGC5 H13 N2 O5 PSER
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.95 Å
  • R-Value Free: 0.253 
  • R-Value Work: 0.183 
  • R-Value Observed: 0.187 
  • Space Group: H 3 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 151.31α = 90
b = 151.31β = 90
c = 247.24γ = 120
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
XSCALEdata scaling
XDSphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-04-28
    Type: Initial release
  • Version 1.1: 2011-06-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2018-02-28
    Changes: Database references, Source and taxonomy
  • Version 1.4: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Data collection, Derived calculations, Other, Structure summary
  • Version 1.5: 2021-05-12
    Changes: Derived calculations, Structure summary