6CQV

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

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.209 
  • R-Value Work: 0.166 
  • R-Value Observed: 0.168 

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This is version 2.0 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:  
    6CQT, 6CQU, 6CQV, 6CQW, 6CQX, 6CQY, 6CQZ

  • 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 the stereochemistry of the inhibitor ...

    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.



Macromolecules
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(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
AcetylcholinesteraseA, B542Homo 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
GTEx:  ENSG00000087085 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP22303
Protein Feature View
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  • Reference Sequence
Oligosaccharides

Help

Entity ID: 2
MoleculeChainsChain Length2D DiagramGlycosylation3D Interactions
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-[alpha-L-fucopyranose-(1-6)]2-acetamido-2-deoxy-beta-D-glucopyranoseC, E 3N-Glycosylation Oligosaccharides Interaction
Glycosylation Resources
GlyTouCan:  G21290RB
GlyCosmos:  G21290RB
GlyGen:  G21290RB
Entity ID: 3
MoleculeChainsChain Length2D DiagramGlycosylation3D Interactions
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranoseD 2N-Glycosylation Oligosaccharides Interaction
Glycosylation Resources
GlyTouCan:  G42666HT
GlyCosmos:  G42666HT
GlyGen:  G42666HT
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
HI6
Query on HI6
Download Ideal Coordinates CCD File 
F [auth A],
H [auth B]		4-(AMINOCARBONYL)-1-[({2-[(E)-(HYDROXYIMINO)METHYL]PYRIDINIUM-1-YL}METHOXY)METHYL]PYRIDINIUM
C14 H16 N4 O3
FJZDLOMCEPUCII-UHFFFAOYSA-P		 Ligand Interaction
NAG
Query on NAG
Download Ideal Coordinates CCD File 
I [auth B]2-acetamido-2-deoxy-beta-D-glucopyranose
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N		 Ligand Interaction
VX
Query on VX
Download Ideal Coordinates CCD File 
G [auth A],
J [auth B]		O-ETHYLMETHYLPHOSPHONIC ACID ESTER GROUP
C3 H9 O3 P
UFZOPKFMKMAWLU-UHFFFAOYSA-N		 Ligand Interaction
Binding Affinity Annotations 
IDSourceBinding Affinity
HI6 BindingDB:  6CQV Kd: min: 1.50e+4, max: 2.34e+5 (nM) from 6 assay(s)
IC50: min: 6.36e+5, max: 1.36e+6 (nM) from 3 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.209 
  • R-Value Work: 0.166 
  • R-Value Observed: 0.168 
  • Space Group: P 31 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 104.374α = 90
b = 104.374β = 90
c = 323.631γ = 120
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2018-12-05
    Type: Initial release
  • Version 1.1: 2019-03-27
    Changes: Data collection, Database references
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Advisory, Atomic model, Data collection, Derived calculations, Structure summary