1E66

STRUCTURE OF ACETYLCHOLINESTERASE COMPLEXED WITH (-)-HUPRINE X AT 2.1A RESOLUTION


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.205 
  • R-Value Work: 0.177 

wwPDB Validation 3D Report Full Report


This is version 2.0 of the entry. See complete history

Literature

3D Structure of Torpedo Californica Acetylcholinesterase Complexed with Huprine X at 2. 1 A Resolution: Kinetic and Molecular Dynamic Correlates.

Dvir, H.Wong, D.M.Harel, M.Barril, X.Orozco, M.Luque, F.J.Munoz-Torrero, D.Camps, P.Rosenberry, T.L.Silman, I.Sussman, J.L.

(2002) Biochemistry 41: 2970


  • PubMed Abstract: 
  • Huprine X is a novel acetylcholinesterase (AChE) inhibitor, with one of the highest affinities reported for a reversible inhibitor. It is a synthetic hybrid that contains the 4-aminoquinoline substructure of one anti-Alzheimer drug, tacrine, and a ca ...

    Huprine X is a novel acetylcholinesterase (AChE) inhibitor, with one of the highest affinities reported for a reversible inhibitor. It is a synthetic hybrid that contains the 4-aminoquinoline substructure of one anti-Alzheimer drug, tacrine, and a carbobicyclic moiety resembling that of another AChE inhibitor, (-)-huperzine A. Cocrystallization of huprine X with Torpedo californica AChE yielded crystals whose 3D structure was determined to 2.1 A resolution. The inhibitor binds to the anionic site and also hinders access to the esteratic site. Its aromatic portion occupies the same binding site as tacrine, stacking between the aromatic rings of Trp84 and Phe330, whereas the carbobicyclic unit occupies the same binding pocket as (-)-huperzine A. Its chlorine substituent was found to lie in a hydrophobic pocket interacting with rings of the aromatic residues Trp432 and Phe330 and with the methyl groups of Met436 and Ile439. Steady-state inhibition data show that huprine X binds to human AChE and Torpedo AChE 28- and 54-fold, respectively, more tightly than tacrine. This difference stems from the fact that the aminoquinoline moiety of huprine X makes interactions similar to those made by tacrine, but additional bonds to the enzyme are made by the huperzine-like substructure and the chlorine atom. Furthermore, both tacrine and huprine X bind more tightly to Torpedo than to human AChE, suggesting that their quinoline substructures interact better with Phe330 than with Tyr337, the corresponding residue in the human AChE structure. Both (-)-huperzine A and huprine X display slow binding properties, but only binding of the former causes a peptide flip of Gly117.


    Organizational Affiliation

    Department of Structural Biology, Weizmann Institute of Science, Rehovot, Israel, 76100.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
ACETYLCHOLINESTERASE
A
543Torpedo californicaGene Names: ache
EC: 3.1.1.7
Find proteins for P04058 (Torpedo californica)
Go to UniProtKB:  P04058
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
HUX
Query on HUX

Download SDF File 
Download CCD File 
A
3-CHLORO-9-ETHYL-6,7,8,9,10,11-HEXAHYDRO-7,11-METHANOCYCLOOCTA[B]QUINOLIN-12-AMINE
C18 H19 Cl N2
QTPHSDHUHXUYFE-NWDGAFQWSA-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
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
HUXKi: 0.13 nM BINDINGMOAD
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.205 
  • R-Value Work: 0.177 
  • Space Group: P 31 2 1
Unit Cell:
Length (Å)Angle (°)
a = 112.335α = 90.00
b = 112.335β = 90.00
c = 138.165γ = 120.00
Software Package:
Software NamePurpose
CNSrefinement
CNSphasing
SCALEPACKdata scaling
DENZOdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2001-08-02
    Type: Initial release
  • Version 1.1: 2011-08-31
    Type: Derived calculations, Non-polymer description, Other, Refinement description, Structure summary, Version format compliance
  • Version 2.0: 2017-07-12
    Type: Advisory, Atomic model, Derived calculations