5BWC

ACETYLCHOLINESTERASE (E.C. 3.1.1.7) FROM TORPEDO CALIFORNICA IN COMPLEX WITH THE BIS-PYRIDINIUM OXIME ORTHO-7


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.45 Å
  • R-Value Free: 0.266 
  • R-Value Work: 0.241 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

A conformational change in the peripheral anionic site of Torpedo californica acetylcholinesterase induced by a bis-imidazolium oxime.

Legler, P.M.Soojhawon, I.Millard, C.B.

(2015) Acta Crystallogr.,Sect.D 71: 1788-1798

  • DOI: 10.1107/S1399004715011281
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • As part of ongoing efforts to design improved nerve agent antidotes, two X-ray crystal structures of Torpedo californica acetylcholinesterase (TcAChE) bound to the bis-pyridinium oxime, Ortho-7, or its experimental bis-imidazolium analogue, 2BIM-7, w ...

    As part of ongoing efforts to design improved nerve agent antidotes, two X-ray crystal structures of Torpedo californica acetylcholinesterase (TcAChE) bound to the bis-pyridinium oxime, Ortho-7, or its experimental bis-imidazolium analogue, 2BIM-7, were determined. Bis-oximes contain two oxime groups connected by a hydrophobic linker. One oxime group of Ortho-7 binds at the entrance to the active-site gorge near Trp279, and the second binds at the bottom near Trp84 and Phe330. In the Ortho-7-TcAChE complex the oxime at the bottom of the gorge was directed towards the nucleophilic Ser200. In contrast, the oxime group of 2BIM-7 was rotated away from Ser200 and the oxime at the entrance induced a significant conformational change in the peripheral anionic site (PAS) residue Trp279. The conformational change alters the surface of the PAS and positions the imidazolium oxime of 2BIM-7 further from Ser200. The relatively weaker binding and poorer reactivation of VX-inhibited, tabun-inhibited or sarin-inhibited human acetylcholinesterase by 2BIM-7 compared with Ortho-7 may in part be owing to the unproductively bound states caught in crystallo. Overall, the reactivation efficiency of 2BIM-7 was comparable to that of 2-pyridine aldoxime methyl chloride (2-PAM), but unlike 2-PAM the bis-imidazolium oxime lacks a fixed charge, which may affect its membrane permeability.


    Organizational Affiliation

    CBMSE, U.S. Naval Research Laboratory, 4555 Overlook Avenue, Washington, DC 20375, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Acetylcholinesterase
A
537Tetronarce californicaMutation(s): 0 
Gene Names: ache
EC: 3.1.1.7
Find proteins for P04058 (Tetronarce californica)
Go to UniProtKB:  P04058
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
HBP
Query on HBP

Download SDF File 
Download CCD File 
A
1,7-HEPTYLENE-BIS-N,N'-SYN-2-PYRIDINIUMALDOXIME
C19 H26 N4 O2
NJSMUQMHXZRXQC-UHFFFAOYSA-P
 Ligand Interaction
NAG
Query on NAG

Download SDF File 
Download CCD File 
A
N-ACETYL-D-GLUCOSAMINE
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
HBPKi: 61 nM BINDINGMOAD
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.45 Å
  • R-Value Free: 0.266 
  • R-Value Work: 0.241 
  • Space Group: P 31 2 1
Unit Cell:
Length (Å)Angle (°)
a = 112.152α = 90.00
b = 112.152β = 90.00
c = 137.328γ = 120.00
Software Package:
Software NamePurpose
AMoREphasing
REFMACrefinement
SAINTdata reduction
SADABSdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Defense Threat Reduction AgencyUnited StatesE0036_08_WR_C

Revision History 

  • Version 1.0: 2015-09-09
    Type: Initial release
  • Version 1.1: 2015-09-16
    Type: Database references