6O69

Crystal Structure of Double Mutant L380R/F535K of Human Acetylcholinesterase


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.081 Å
  • R-Value Free: 0.222 
  • R-Value Work: 0.186 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

The structural and biochemical impacts of monomerizing human acetylcholinesterase.

Bester, S.M.Adipietro, K.A.Funk, V.L.Myslinski, J.M.Keul, N.D.Cheung, J.Wilder, P.T.Wood, Z.A.Weber, D.J.Height, J.J.Pegan, S.D.

(2019) Protein Sci. 28: 1106-1114

  • DOI: 10.1002/pro.3625

  • PubMed Abstract: 
  • Serving a critical role in neurotransmission, human acetylcholinesterase (hAChE) is the target of organophosphate nerve agents. Hence, there is an active interest in studying the mechanism of inhibition and recovery of enzymatic activity, which could ...

    Serving a critical role in neurotransmission, human acetylcholinesterase (hAChE) is the target of organophosphate nerve agents. Hence, there is an active interest in studying the mechanism of inhibition and recovery of enzymatic activity, which could lead to better countermeasures against nerve agents. As hAChE is found in different oligomeric assemblies, certain approaches to studying it have been problematic. Herein, we examine the biochemical and structural impact of monomerizing hAChE by using two mutations: L380R/F535K. The activities of monomeric hAChE L380R/F535K and dimeric hAChE were determined to be comparable utilizing a modified Ellman's assay. To investigate the influence of subunit-subunit interactions on the structure of hAChE, a 2.1 Å X-ray crystallographic structure was determined. Apart from minor shifts along the dimer interface, the overall structure of the hAChE L380R/F535K mutant is similar to that of dimeric hAChE. To probe whether the plasticity of the active site was overtly impacted by monomerizing hAChE, the kinetic constants of (P R/S ) - VX (ethyl({2-[bis(propan-2-yl)amino]ethyl}sulfanyl)(methyl)phosphinate) inhibition and subsequent rescue of hAChE L380R/F535K activity with HI-6 (1-(2'-hydroxyiminomethyl-1'-pyridinium)-3-(4'-carbamoyl-1-pyridinium)) were determined and found to be comparable to those of dimeric hAChE. Thus, hAChE L380R/F535K could be used as a substitute for dimeric hAChE when experimentally probing the ability of the hAChE active site to accommodate future nerve agent threats or judge the ability of new therapeutics to access the active site.


    Organizational Affiliation

    New York Structural Biology Center, New York, New York 10027.,United States Research Institute of Chemical Defense, Aberdeen Proving Ground, Edgewood, Maryland.,Department of Pharmaceutical and Biomedical Sciences, University of Georgia, Athens, Georgia 30602.,Department of Biochemistry and Molecular Biology, Center for Biomolecular Therapeutics, University of Maryland School of Medicine, Baltimore, Maryland 21201.,U.S. Army Chemical Biological Center, Aberdeen Proving Ground, Maryland 21010-5424.,Department of Biochemistry and Molecular Biology, University of Georgia, Athens, Georgia 30602.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Acetylcholinesterase
A
542Homo sapiensMutation(s): 2 
Gene Names: ACHE
EC: 3.1.1.7
Find proteins for P22303 (Homo sapiens)
Go to Gene View: ACHE
Go to UniProtKB:  P22303
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
FUC
Query on FUC

Download SDF File 
Download CCD File 
A
ALPHA-L-FUCOSE
C6 H12 O5
SHZGCJCMOBCMKK-SXUWKVJYSA-N
 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
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.081 Å
  • R-Value Free: 0.222 
  • R-Value Work: 0.186 
  • Space Group: P 65 2 2
Unit Cell:
Length (Å)Angle (°)
a = 115.783α = 90.00
b = 115.783β = 90.00
c = 191.859γ = 120.00
Software Package:
Software NamePurpose
HKL-2000data scaling
HKL-2000data reduction
PHASERphasing
PHENIXrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2019-05-01
    Type: Initial release
  • Version 1.1: 2019-05-22
    Type: Data collection, Database references