6CQV

Crystal Structure of Recombinant Human Acetylcholinesterase in Complex with VX(+) and HI-6


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.601 Å
  • R-Value Free: 0.209 
  • R-Value Work: 0.166 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structural Insights of Stereospecific Inhibition of Human Acetylcholinesterase by VX and Subsequent Reactivation by HI-6.

Bester, S.M.Guelta, M.A.Cheung, J.Winemiller, M.D.Bae, S.Y.Myslinski, J.Pegan, S.D.Height, J.J.

(2018) Chem. Res. Toxicol. 31: 1405-1417

  • DOI: 10.1021/acs.chemrestox.8b00294
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Over 50 years ago, the toxicity of irreversible organophosphate inhibitors targeting human acetylcholinesterase (hAChE) was observed to be stereospecific. The therapeutic reversal of hAChE inhibition by reactivators has also been shown to depend on t ...

    Over 50 years ago, the toxicity of irreversible organophosphate inhibitors targeting human acetylcholinesterase (hAChE) was observed to be stereospecific. The therapeutic reversal of hAChE inhibition by reactivators has also been shown to depend on the stereochemistry of the inhibitor. To gain clarity on the mechanism of stereospecific inhibition, the X-ray crystallographic structures of hAChE inhibited by a racemic mixture of VX (P R/S ) and its enantiomers were obtained. Beyond identifying hAChE structural features that lend themselves to stereospecific inhibition, structures of the reactivator HI-6 bound to hAChE inhibited by VX enantiomers of varying toxicity, or in its uninhibited state, were obtained. Comparison of hAChE in these pre-reactivation and post-reactivation states along with enzymatic data reveals the potential influence of unproductive reactivator poses on the efficacy of these types of therapeutics. The recognition of structural features related to hAChE's stereospecificity toward VX shed light on the molecular influences of toxicity and their effect on reactivators. In addition to providing a better understanding of the innate issues with current reactivators, an avenue for improvement of reactivators is envisioned.


    Organizational Affiliation

    Edgewood Chemical Biological Center, United States Army , Aberdeen Proving Ground, Aberdeen , Maryland 21010 , United States.,Department of Pharmaceutical and Biomedical Sciences , University of Georgia , Athens , Georgia 30602 , United States.,New York Structural Biology Center , New York , New York 10027 , United States.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Acetylcholinesterase
A, B
542Homo 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
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
FUC
Query on FUC

Download SDF File 
Download CCD File 
A, B
ALPHA-L-FUCOSE
C6 H12 O5
SHZGCJCMOBCMKK-SXUWKVJYSA-N
 Ligand Interaction
HI6
Query on HI6

Download SDF File 
Download CCD File 
A, B
4-(AMINOCARBONYL)-1-[({2-[(E)-(HYDROXYIMINO)METHYL]PYRIDINIUM-1-YL}METHOXY)METHYL]PYRIDINIUM
1-(2-HYDROXY-IMINOMETHYLPYRIDINIUM)-1-(4-CARBOXYAMINO)-PYRIDINIUM DIMETHYLETHER
C14 H16 N4 O3
FJZDLOMCEPUCII-UHFFFAOYSA-P
 Ligand Interaction
NAG
Query on NAG

Download SDF File 
Download CCD File 
A, B
N-ACETYL-D-GLUCOSAMINE
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
 Ligand Interaction
VX
Query on VX

Download SDF File 
Download CCD File 
A, B
O-ETHYLMETHYLPHOSPHONIC ACID ESTER GROUP
C3 H9 O3 P
UFZOPKFMKMAWLU-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.601 Å
  • R-Value Free: 0.209 
  • R-Value Work: 0.166 
  • Space Group: P 31 2 1
Unit Cell:
Length (Å)Angle (°)
a = 104.374α = 90.00
b = 104.374β = 90.00
c = 323.631γ = 120.00
Software Package:
Software NamePurpose
HKL-2000data scaling
HKL-2000data reduction
PHENIXrefinement
PHASERphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2018-12-05
    Type: Initial release
  • Version 1.1: 2019-03-27
    Type: Data collection, Database references