Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 121.51 kDa 
• Atom Count: 9158 
• Modelled Residue Count: 1062 
• Deposited Residue Count: 1084 
• Unique protein chains: 1

6CQV

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

• DOI: 10.2210/pdb6CQV/pdb

• Classification: HYDROLASE
• Organism(s): Homo sapiens
• Expression System: Homo sapiens
• Mutation(s): No 


• Deposited: 2018-03-16 Released: 2018-12-05 
• Deposition Author(s): Bester, S.M., Guelta, M.A., Pegan, S.D., Height, J.J.

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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 

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

• PubMed: 30462502 
• DOI: 10.1021/acs.chemrestox.8b00294
• Primary Citation of Related Structures:  
  6CQU, 6CQT, 6CQW, 6CQV, 6CQY, 6CQX, 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. 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.

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Organizational Affiliation: 

Edgewood Chemical Biological Center, United States Army , Aberdeen Proving Ground, Aberdeen , Maryland 21010 , United States.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Acetylcholinesterase	A, B	542	Homo sapiens	Mutation(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

Oligosaccharides

Help

Entity ID: 2
Molecule	Chains	Chain Length	2D Diagram	Glycosylation
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-[alpha-L-fucopyranose-(1-6)]2-acetamido-2-deoxy-beta-D-glucopyranose	C, E	3		N-Glycosylation
Glycosylation Resources
GlyTouCan:  G21290RB GlyCosmos:  G21290RB GlyGen:  G21290RB

Entity ID: 3
Molecule	Chains	Chain Length	2D Diagram	Glycosylation
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose	D	2		N-Glycosylation
Glycosylation Resources
GlyTouCan:  G42666HT GlyCosmos:  G42666HT GlyGen:  G42666HT

Small Molecules

Ligands 3 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
HI6	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
NAG	I [auth B]	2-acetamido-2-deoxy-beta-D-glucopyranose C8 H15 N O6 OVRNDRQMDRJTHS-FMDGEEDCSA-N
VX	G [auth A], J [auth B]	O-ETHYLMETHYLPHOSPHONIC ACID ESTER GROUP C3 H9 O3 P UFZOPKFMKMAWLU-UHFFFAOYSA-N

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 = 104.374	α = 90
b = 104.374	β = 90
c = 323.631	γ = 120

Software Package:

Software Name	Purpose
PHENIX	refinement
HKL-2000	data reduction
HKL-2000	data scaling
PHASER	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2018-03-16 
• Released Date: 2018-12-05 
Deposition Author(s): Bester, S.M., Guelta, M.A., Pegan, S.D., Height, J.J.

Revision History  

• 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