Biological Assembly 1  

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Global Symmetry: Dihedral - D4  (3D View)
Global Stoichiometry: Homo 8-mer - A8 

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

Macromolecule Content

• Total Structure Weight: 62091.55 
• Atom Count: 4462 
• Residue Count: 527 
• Unique protein chains: 1

2XQF

X-ray Structure of human butyrylcholinesterase inhibited by racemic VX

• DOI: 10.2210/pdb2XQF/pdb

• Classification: HYDROLASE
• Organism(s): Homo sapiens
• Expression System: Cricetulus griseus
• Mutation(s): 4 


• Deposited: 2010-09-02 Released: 2011-03-23 
• Deposition Author(s): Wandhammer, M., Carletti, E., Gillon, E., Masson, P., Goeldner, M., Noort, D., Nachon, F.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.1 Å
• R-Value Free: 0.189 
• R-Value Work: 0.149 

Literature

Structural Study of the Complex Stereoselectivity of Human Butyrylcholinesterase for the Neurotoxic V-Agents.

Wandhammer, M., Carletti, E., Van Der Schans, M., Gillon, E., Nicolet, Y., Masson, P., Goeldner, M., Noort, D., Nachon, F.

(2011) J.Biol.Chem. 286: 16783

• PubMed: 21454498 
• DOI: 10.1074/jbc.M110.209569
• Primary Citation of Related Structures:  
  2XQK, 2XQJ, 2XQI, 2XQG


• PubMed Abstract: 
  

Nerve agents are chiral organophosphate compounds (OPs) that exert their acute toxicity by phosphorylating the catalytic serine of acetylcholinesterase (AChE). The inhibited cholinesterases can be reactivated using oximes, but a spontaneous time-dependent process called aging alters the adduct, leading to resistance toward oxime reactivation. Human butyrylcholinesterase (BChE) functions as a bioscavenger, protecting the cholinergic system against OPs. The stereoselectivity of BChE is an important parameter for its efficiency at scavenging the most toxic OPs enantiomer for AChE. Crystals of BChE inhibited in solution or in cristallo with racemic V-agents (VX, Russian VX, and Chinese VX) systematically show the formation of the P(S) adduct. In this configuration, no catalysis of aging seems possible as confirmed by the three-dimensional structures of the three conjugates incubated over a period exceeding a week. Crystals of BChE soaked in optically pure VX(R)-(+) and VX(S)-(-) solutions lead to the formation of the P(S) and P(R) adduct, respectively. These structural data support an in-line phosphonylation mechanism. Additionally, they show that BChE reacts with VX(R)-(+) in the presence of racemic mixture of V-agents, at odds with earlier kinetic results showing a moderate higher inhibition rate for VX(S)-(-). These combined results suggest that the simultaneous presence of both enantiomers alters the enzyme stereoselectivity. In summary, the three-dimensional data show that BChE reacts preferentially with P(R) enantiomer of V-agents and does not age, in complete contrast to AChE, which is selectively inhibited by the P(S) enantiomer and ages.

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Organizational Affiliation: 

Département de Toxicologie, Institut de Recherche Biomédicale des Armées-CRSSA, 38700 La Tronche, France.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
CHOLINESTERASE	A	527	Homo sapiens	Mutation(s): 4  Gene Names: BCHE (CHE1) EC: 3.1.1.8
Find proteins for P06276 (Homo sapiens) Go to Gene View: BCHE Go to UniProtKB:  P06276

Small Molecules

Ligands 9 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
K	A	POTASSIUM ION K NPYPAHLBTDXSSS-UHFFFAOYSA-N
GLY	A	GLYCINE C2 H5 N O2 DHMQDGOQFOQNFH-UHFFFAOYSA-N
NA	A	SODIUM ION Na FKNQFGJONOIPTF-UHFFFAOYSA-N
SO4	A	SULFATE ION O4 S QAOWNCQODCNURD-UHFFFAOYSA-L
CL	A	CHLORIDE ION Cl VEXZGXHMUGYJMC-UHFFFAOYSA-M
UNX	A	UNKNOWN ATOM OR ION X *
NAG	A	N-ACETYL-D-GLUCOSAMINE C8 H15 N O6 OVRNDRQMDRJTHS-FMDGEEDCSA-N
FUL	A	BETA-L-FUCOSE 6-DEOXY-BETA-L-GALACTOSE C6 H12 O5 SHZGCJCMOBCMKK-KGJVWPDLSA-N
VX	A	O-ETHYLMETHYLPHOSPHONIC ACID ESTER GROUP C3 H9 O3 P UFZOPKFMKMAWLU-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.1 Å
• R-Value Free: 0.189 
• R-Value Work: 0.149 
• Space Group: I 4 2 2

Unit Cell:

Length (Å)	Angle (°)
a = 155.110	α = 90.00
b = 155.110	β = 90.00
c = 128.100	γ = 90.00

Software Package:

Software Name	Purpose
XDS	data reduction
MOLREP	phasing
XSCALE	data scaling
REFMAC	refinement

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2010-09-02 
• Released Date: 2011-03-23 
• Deposition Author(s): Wandhammer, M., Carletti, E., Gillon, E., Masson, P., Goeldner, M., Noort, D., Nachon, F.

Revision History 

• Version 1.0: 2011-03-23
  Type: Initial release
• Version 1.1: 2011-05-12
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance