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 

wwPDB Validation 3D Report Full Report


This is version 1.3 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

  • 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 re ...

    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 Mol├ęculaire, Institut de Biologie Structurale (CEA-CNRS-UJF), Grenoble, France.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
ACETHYLCHOLINESTERASE
A
583Homo sapiensMutation(s): 0 
Gene Names: ACHE
EC: 3.1.1.7
Find proteins for P22303 (Homo sapiens)
Go to Gene View: ACHE
Go to UniProtKB:  P22303
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
FASCICULIN-2
B
61Dendroaspis angusticepsMutation(s): 0 
Find proteins for P0C1Z0 (Dendroaspis angusticeps)
Go to UniProtKB:  P0C1Z0
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

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A
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
CL
Query on CL

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A
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
UNX
Query on UNX

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A
UNKNOWN ATOM OR ION
X
*
 Ligand Interaction
NAG
Query on NAG

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A
N-ACETYL-D-GLUCOSAMINE
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
 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 
  • Space Group: H 3 2
Unit Cell:
Length (Å)Angle (°)
a = 151.310α = 90.00
b = 151.310β = 90.00
c = 247.240γ = 120.00
Software Package:
Software NamePurpose
XDSdata reduction
XSCALEdata scaling
XDSphasing
REFMACrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2010-04-28
    Type: Initial release
  • Version 1.1: 2011-06-30
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2018-02-28
    Type: Database references, Source and taxonomy