6CQW

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

• PDB DOI: https://doi.org/10.2210/pdb6CQW/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: 2.28 Å
• R-Value Free: 0.199 
• R-Value Work: 0.171 
• R-Value Observed: 0.172 

Biological Assembly 1  

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

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

Macromolecule Content

• Total Structure Weight: 121.52 kDa 
• Atom Count: 9,201 
• Modelled Residue Count: 1,064 
• Deposited Residue Count: 1,084 
• Unique protein chains: 1

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

Small Molecules

Ligands 3 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
HI6	H [auth A], K [auth B]	4-(AMINOCARBONYL)-1-[({2-[(E)-(HYDROXYIMINO)METHYL]PYRIDINIUM-1-YL}METHOXY)METHYL]PYRIDINIUM C14 H16 N4 O3 FJZDLOMCEPUCII-UHFFFAOYSA-P
NAG	E [auth A], F [auth A], 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

Binding Affinity Annotations
ID	Source	Binding Affinity
HI6	BindingDB:  6CQW	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)
	Binding MOAD:  6CQW	Kd: 64 (nM) from 1 assay(s)

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.28 Å
• R-Value Free: 0.199 
• R-Value Work: 0.171 
• R-Value Observed: 0.172 
• Space Group: P 3₁ 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 105.03	α = 90
b = 105.03	β = 90
c = 324.611	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

• 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: Atomic model, Data collection, Derived calculations, Structure summary
• Version 2.1: 2023-10-04
  Changes: Data collection, Database references, Derived calculations, Refinement description, Structure summary