8DT7

X-ray structure of human acetylcholinesterase in complex with oxime MMB4 (hAChE-MMB4)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.21 Å
  • R-Value Free: 0.211 
  • R-Value Work: 0.192 
  • R-Value Observed: 0.193 

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This is version 1.1 of the entry. See complete history


Literature

Structural and dynamic effects of paraoxon binding to human acetylcholinesterase by X-ray crystallography and inelastic neutron scattering.

Gerlits, O.Fajer, M.Cheng, X.Blumenthal, D.K.Radic, Z.Kovalevsky, A.

(2022) Structure 30: 1538-1549.e3

  • DOI: https://doi.org/10.1016/j.str.2022.09.006
  • Primary Citation of Related Structures:  
    8DT2, 8DT4, 8DT5, 8DT7

  • PubMed Abstract: 
  • Organophosphorus (OP) compounds, including nerve agents and some pesticides, covalently bind to the catalytic serine of human acetylcholinesterase (hAChE), thereby inhibiting acetylcholine hydrolysis necessary for efficient neurotransmission. Oxime antidotes can reactivate the OP-conjugated hAChE, but reactivation efficiency can be low for pesticides, such as paraoxon (POX) ...

    Organophosphorus (OP) compounds, including nerve agents and some pesticides, covalently bind to the catalytic serine of human acetylcholinesterase (hAChE), thereby inhibiting acetylcholine hydrolysis necessary for efficient neurotransmission. Oxime antidotes can reactivate the OP-conjugated hAChE, but reactivation efficiency can be low for pesticides, such as paraoxon (POX). Understanding structural and dynamic determinants of OP inhibition and reactivation can provide insights to design improved reactivators. Here, X-ray structures of hAChE with unaged POX, with POX and oximes MMB4 and RS170B, and with MMB4 are reported. A significant conformational distortion of the acyl loop was observed upon POX binding, being partially restored to the native conformation by oximes. Neutron vibrational spectroscopy combined with molecular dynamics simulations showed that picosecond vibrational dynamics of the acyl loop soften in the ∼20-50 cm -1 frequency range. The acyl loop structural perturbations may be correlated with its picosecond vibrational dynamics to yield more comprehensive template for structure-based reactivator design.


    Organizational Affiliation

    Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA. Electronic address: kovalevskyay@ornl.gov.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Acetylcholinesterase
A, B
550Homo sapiensMutation(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
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP22303
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.21 Å
  • R-Value Free: 0.211 
  • R-Value Work: 0.192 
  • R-Value Observed: 0.193 
  • Space Group: P 31
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 124.652α = 90
b = 124.652β = 90
c = 130.085γ = 120
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-3000data reduction
HKL-3000data scaling
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of Neurological Disorders and Stroke (NIH/NINDS)United StatesU01NS083451

Revision History  (Full details and data files)

  • Version 1.0: 2022-11-02
    Type: Initial release
  • Version 1.1: 2022-11-16
    Changes: Database references