2XMD

G117H mutant of human butyrylcholinesterase in complex with echothiophate


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.214 
  • R-Value Work: 0.170 
  • R-Value Observed: 0.172 

Starting Model: experimental
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Ligand Structure Quality Assessment 


This is version 2.1 of the entry. See complete history


Literature

X-Ray Crystallographic Snapshots of Reaction Intermediates in the G117H Mutant of Human Butyrylcholinesterase, a Nerve Agent Target Engineered Into a Catalytic Bioscavenge

Nachon, F.Carletti, E.Wandhammer, M.Nicolet, Y.Schopfer, L.M.Masson, P.Lockridge, O.

(2011) Biochem J 434: 73

  • DOI: https://doi.org/10.1042/BJ20101648
  • Primary Citation of Related Structures:  
    2XMB, 2XMC, 2XMD, 2XMG

  • PubMed Abstract: 

    OPs (organophosphylates) exert their acute toxicity through inhibition of acetylcholinesterase, by phosphylation of the catalytic serine residue. Engineering of human butyrylcholinesterase, by substitution of a histidine residue for the glycine residue at position 117, led to the creation of OP hydrolase activity. However, the lack of structural information and poor understanding of the hydrolytic mechanism of the G117H mutant has hampered further improvements in the catalytic activity. We have solved the crystallographic structure of the G117H mutant with a variety of ligands in its active site. A sulfate anion bound to the active site suggested the positioning for an OP prior to phosphylation. A fluoride anion was found in the active site when NaF was added to the crystallization buffer. In the fluoride complex, the imidazole ring from the His117 residue was substantially shifted, adopting a relaxed conformation probably close to that of the unliganded mutant enzyme. Additional X-ray structures were obtained from the transient covalent adducts formed upon reaction of the G117H mutant with the OPs echothiophate and VX [ethyl ({2-[bis(propan-2-yl)amino]ethyl}sulfanyl](methyl)phosphinate]. The position of the His117 residue shifted in response to the introduction of these adducts, overlaying the phosphylserine residue. These structural data suggest that the dephosphylation mechanism involves either a substantial conformational change of the His117 residue or an adjacent nucleophilic substitution by water.


  • Organizational Affiliation

    Cellule Enzymologie, Département de Toxicologie, Institut de Recherche Biomédicale des Armées-CRSSA, 24 avenue des Maquis du Grésivaudan, La Tronche, France. florian@nachon.net


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
CHOLINESTERASE529Homo sapiensMutation(s): 5 
EC: 3.1.1.8
UniProt & NIH Common Fund Data Resources
Find proteins for P06276 (Homo sapiens)
Explore P06276 
Go to UniProtKB:  P06276
PHAROS:  P06276
GTEx:  ENSG00000114200 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP06276
Glycosylation
Glycosylation Sites: 6Go to GlyGen: P06276-1
Sequence Annotations
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  • Reference Sequence
Oligosaccharides

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Entity ID: 2
MoleculeChains Length2D Diagram Glycosylation3D Interactions
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-[beta-L-fucopyranose-(1-6)]2-acetamido-2-deoxy-beta-D-glucopyranose
B, C
3N-Glycosylation
Glycosylation Resources
GlyTouCan:  G28454KX
GlyCosmos:  G28454KX
GlyGen:  G28454KX
Entity ID: 3
MoleculeChains Length2D Diagram Glycosylation3D Interactions
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-[alpha-L-fucopyranose-(1-6)]2-acetamido-2-deoxy-beta-D-glucopyranose
D
3N-Glycosylation
Glycosylation Resources
GlyTouCan:  G21290RB
GlyCosmos:  G21290RB
GlyGen:  G21290RB
Small Molecules
Ligands 8 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
NAG
Query on NAG

Download Ideal Coordinates CCD File 
HA [auth A],
IA [auth A],
JA [auth A]
2-acetamido-2-deoxy-beta-D-glucopyranose
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
DEP
Query on DEP

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Z [auth A]DIETHYL PHOSPHONATE
C4 H11 O3 P
MJUJXFBTEFXVKU-UHFFFAOYSA-N
SO4
Query on SO4

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AA [auth A]SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
BR
Query on BR

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EA [auth A]BROMIDE ION
Br
CPELXLSAUQHCOX-UHFFFAOYSA-M
CA
Query on CA

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GA [auth A]CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
CL
Query on CL

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BA [auth A],
CA [auth A],
DA [auth A],
KA [auth A]
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
NA
Query on NA

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FA [auth A],
LA [auth A]
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
UNX
Query on UNX

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E [auth A]
F [auth A]
G [auth A]
H [auth A]
I [auth A]
E [auth A],
F [auth A],
G [auth A],
H [auth A],
I [auth A],
J [auth A],
K [auth A],
L [auth A],
M [auth A],
N [auth A],
O [auth A],
P [auth A],
Q [auth A],
R [auth A],
S [auth A],
T [auth A],
U [auth A],
V [auth A],
W [auth A],
X [auth A],
Y [auth A]
UNKNOWN ATOM OR ION
X
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.214 
  • R-Value Work: 0.170 
  • R-Value Observed: 0.172 
  • Space Group: I 4 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 154.88α = 90
b = 154.88β = 90
c = 127.53γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
XSCALEdata scaling
MOLREPphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-12-01
    Type: Initial release
  • Version 1.1: 2011-11-16
    Changes: Database references, Refinement description, Version format compliance
  • Version 1.2: 2019-01-30
    Changes: Data collection, Experimental preparation, Other
  • Version 1.3: 2019-02-06
    Changes: Data collection, Experimental preparation
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Advisory, Atomic model, Data collection, Derived calculations, Other, Structure summary
  • Version 2.1: 2023-12-20
    Changes: Data collection, Database references, Refinement description, Structure summary