Structure of mouse acetylcholinesterase inhibited by CBDP (30-min soak): cresyl-saligenin-phosphoserine adduct

Experimental Data Snapshot

  • Resolution: 2.95 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.186 
  • R-Value Observed: 0.188 

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Inhibition Pathways of the Potent Organophosphate Cbdp with Cholinesterases Revealed by X-Ray Crystallographic Snapshots and Mass Spectrometry

Carletti, E.Colletier, J.-P.Schopfer, L.M.Santoni, G.Masson, P.Lockridge, O.Nachon, F.Weik, M.

(2013) Chem Res Toxicol 26: 280

  • DOI: https://doi.org/10.1021/tx3004505
  • Primary Citation of Related Structures:  
    4BBZ, 4BC0, 4BC1

  • PubMed Abstract: 

    Tri-o-cresyl-phosphate (TOCP) is a common additive in jet engine lubricants and hydraulic fluids suspected to have a role in aerotoxic syndrome in humans. TOCP is metabolized to cresyl saligenin phosphate (CBDP), a potent irreversible inhibitor of butyrylcholinesterase (BChE), a natural bioscavenger present in the bloodstream, and acetylcholinesterase (AChE), the off-switch at cholinergic synapses. Mechanistic details of cholinesterase (ChE) inhibition have, however, remained elusive. Also, the inhibition of AChE by CBDP is unexpected, from a structural standpoint, i.e., considering the narrowness of AChE active site and the bulkiness of CBDP. In the following, we report on kinetic X-ray crystallography experiments that provided 2.7-3.3 Å snapshots of the reaction of CBDP with mouse AChE and human BChE. The series of crystallographic snapshots reveals that AChE and BChE react with the opposite enantiomers and that an induced-fit rearrangement of Phe297 enlarges the active site of AChE upon CBDP binding. Mass spectrometry analysis of aging in either H(2)(16)O or H(2)(18)O furthermore allowed us to identify the inhibition steps, in which water molecules are involved, thus providing insights into the mechanistic details of inhibition. X-ray crystallography and mass spectrometry show the formation of an aged end product formed in both AChE and BChE that cannot be reactivated by current oxime-based therapeutics. Our study thus shows that only prophylactic and symptomatic treatments are viable to counter the inhibition of AChE and BChE by CBDP.

  • Organizational Affiliation

    Institut de Biologie Structurale J.P. Ebel, Commissariat à l'Energie Atomique, 41, rue Jules Horowitz, F-38027 Grenoble, France.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B, C, D
543Mus musculusMutation(s): 0 
Gene Names: Ache
UniProt & NIH Common Fund Data Resources
Find proteins for P21836 (Mus musculus)
Explore P21836 
Go to UniProtKB:  P21836
IMPC:  MGI:87876
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP21836
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on TQV

Download Ideal Coordinates CCD File 
E [auth A],
FA [auth D],
P [auth B],
W [auth C]
C14 H15 O5 P
Query on NAG

Download Ideal Coordinates CCD File 
F [auth A]
GA [auth D]
HA [auth D]
IA [auth D]
Q [auth B]
F [auth A],
GA [auth D],
HA [auth D],
IA [auth D],
Q [auth B],
R [auth B],
X [auth C]
C8 H15 N O6
Query on SO4

Download Ideal Coordinates CCD File 
BA [auth C]
CA [auth C]
DA [auth C]
H [auth A]
I [auth A]
BA [auth C],
CA [auth C],
DA [auth C],
H [auth A],
I [auth A],
J [auth A],
K [auth A],
KA [auth D],
L [auth A],
LA [auth D],
M [auth A],
MA [auth D],
T [auth B],
U [auth B],
V [auth B]
O4 S
Query on CL

Download Ideal Coordinates CCD File 
AA [auth C]
EA [auth C]
G [auth A]
JA [auth D]
N [auth A]
AA [auth C],
EA [auth C],
G [auth A],
JA [auth D],
N [auth A],
NA [auth D],
O [auth A],
OA [auth D],
S [auth B],
Y [auth C],
Z [auth C]
Experimental Data & Validation

Experimental Data

  • Resolution: 2.95 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.186 
  • R-Value Observed: 0.188 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 135.54α = 90
b = 173.25β = 90
c = 224.94γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
XSCALEdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-02-06
    Type: Initial release
  • Version 1.1: 2013-02-27
    Changes: Database references
  • Version 1.2: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Data collection, Derived calculations, Other, Structure summary