Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 129.65 kDa 
• Atom Count: 8799 
• Residue Count: 1067 
• Unique protein chains: 1

1Q84

Crystal structure of the mouse acetylcholinesterase-TZ2PA6 anti complex

• DOI: 10.2210/pdb1Q84/pdb

• Classification: HYDROLASE
• Organism(s): Mus musculus
• Expression System: Homo sapiens
• Mutation(s): No 


• Deposited: 2003-08-20 Released: 2004-02-10 
• Deposition Author(s): Bourne, Y., Kolb, H.C., Radic, Z., Sharpless, K.B., Taylor, P., Marchot, P.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.45 Å
• R-Value Free: 0.214 
• R-Value Work: 0.184 
• R-Value Observed: 0.185 

Literature

Freeze-frame inhibitor captures acetylcholinesterase in a unique conformation.

Bourne, Y., Kolb, H.C., Radic, Z., Sharpless, K.B., Taylor, P., Marchot, P.

(2004) Proc Natl Acad Sci U S A 101: 1449-1454

• PubMed: 14757816 
• DOI: 10.1073/pnas.0308206100
• Structures With Same Primary Citation


• PubMed Abstract: 
  

The 1,3-dipolar cycloaddition reaction between unactivated azides and acetylenes proceeds exceedingly slowly at room temperature. However, considerable rate acceleration is observed when this reaction occurs inside the active center gorge of acetylcholinesterase (AChE) between certain azide and acetylene reactants, attached via methylene chains to specific inhibitor moieties selective for the active center and peripheral site of the enzyme. AChE catalyzes the formation of its own inhibitor in a highly selective fashion: only a single syn1-triazole regioisomer with defined substitution positions and linker distances is generated from a series of reagent combinations. Inhibition measurements revealed this syn1-triazole isomer to be the highest affinity reversible organic inhibitor of AChE with association rate constants near the diffusion limit. The corresponding anti1 isomer, not formed by the enzyme, proved to be a respectable but weaker inhibitor. The crystal structures of the syn1- and anti1-mouse AChE complexes at 2.45- to 2.65-A resolution reveal not only substantial binding contributions from the triazole moieties, but also that binding of the syn1 isomer induces large and unprecedented enzyme conformational changes not observed in the anti1 complex nor predicted from structures of the apoenzyme and complexes with the precursor reactants. Hence, the freeze-frame reaction offers both a strategically original approach for drug discovery and a means for kinetically controlled capture, as a high-affinity complex between the enzyme and its self-created inhibitor, of a highly reactive minor abundance conformer of a fluctuating protein template.

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Organizational Affiliation: 

Ingénierie des Protéines, Centre National de la Recherche Scientifique Unité Mixte de Recherche-6560, Institut Fédératif de Recherche Jean Roche, Université de la Méditerranée, Faculté de Médecine Secteur Nord, F-13916 Marseille Cedex 20, France.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
Acetylcholinesterase	A, B	580	Mus musculus	Mutation(s): 0  Gene Names: Ache EC: 3.1.1.7
Find proteins for P21836 (Mus musculus) Go to UniProtKB:  P21836
NIH Common Fund Data Resources
IMPC  MGI:87876

Small Molecules

Ligands 3 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
TZ4	A, B	3,8-DIAMINO-6-PHENYL-5-[6-[1-[2-[(1,2,3,4-TETRAHYDRO-9-ACRIDINYL)AMINO]ETHYL]-1H-1,2,3-TRIAZOL-4-YL]HEXYL]-PHENANTHRIDINIUM C42 H45 N8 NAARZDJZGYBXKL-UHFFFAOYSA-O
P6G	A	HEXAETHYLENE GLYCOL C12 H26 O7 IIRDTKBZINWQAW-UHFFFAOYSA-N
NAG	A	N-ACETYL-D-GLUCOSAMINE C8 H15 N O6 OVRNDRQMDRJTHS-FMDGEEDCSA-N

External Ligand Annotations
ID	Binding Affinity (Sequence Identity %)
TZ4	Ki :  0.008899999782443047   nM  PDBBind
TZ4	Ki:  0.008899999782443047   nM  Binding MOAD

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.45 Å
• R-Value Free: 0.214 
• R-Value Work: 0.184 
• R-Value Observed: 0.185 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 79.272	α = 90
b = 111.765	β = 90
c = 227.171	γ = 90

Software Package:

Software Name	Purpose
REFMAC	refinement
DENZO	data reduction
CCP4	data scaling
CNS	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2003-08-20 
• Released Date: 2004-02-10 
Deposition Author(s): Bourne, Y., Kolb, H.C., Radic, Z., Sharpless, K.B., Taylor, P., Marchot, P.

Revision History 

• Version 1.0: 2004-02-10
  Type: Initial release
  
• Version 1.1: 2008-04-29
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Non-polymer description, Version format compliance