1AMN

TRANSITION STATE ANALOG: ACETYLCHOLINESTERASE COMPLEXED WITH M-(N,N,N-TRIMETHYLAMMONIO)TRIFLUOROACETOPHENONE

• PDB DOI: https://doi.org/10.2210/pdb1AMN/pdb

• Classification: HYDROLASE (SERINE ESTERASE)
• Organism(s): Tetronarce californica
• Mutation(s): No 


• Deposited: 1996-02-13 Released: 1996-04-03 
• Deposition Author(s): Harel, M., Silman, I., Sussman, J.L.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.80 Å
• R-Value Free: 0.235 
• R-Value Work: 0.188 
• R-Value Observed: 0.188 

Literature

The X-ray structure of a transition state analog complex reveals the molecular origins of the catalytic power and substrate specificity of acetylcholinesterase.

Harel, M., Quinn, D.M., Nair, H.K., Silman, I., Sussman, J.L.

(1996) J Am Chem Soc 118: 2340-2346

Biological Assembly 1  

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

Biological assembly 1 generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 61.08 kDa 
• Atom Count: 4,270 
• Modelled Residue Count: 526 
• Deposited Residue Count: 537 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
ACETYLCHOLINESTERASE	A	537	Tetronarce californica	Mutation(s): 0  EC: 3.1.1.7
UniProt
Find proteins for P04058 (Tetronarce californica) Explore P04058  Go to UniProtKB:  P04058

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
NAF	C [auth A]	M-(N,N,N-TRIMETHYLAMMONIO)-2,2,2-TRIFLUORO-1,1-DIHYDROXYETHYLBENZENE C11 H15 F3 N O2 KGVDBJQLTHWAJF-UHFFFAOYSA-N
SO4	B [auth A]	SULFATE ION O4 S QAOWNCQODCNURD-UHFFFAOYSA-L

Binding Affinity Annotations
ID	Source	Binding Affinity
NAF	PDBBind:  1AMN	Ki: 1.50e-5 (nM) from 1 assay(s)

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.80 Å
• R-Value Free: 0.235 
• R-Value Work: 0.188 
• R-Value Observed: 0.188 
• Space Group: P 3₁ 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 113.54	α = 90
b = 113.54	β = 90
c = 137.53	γ = 120

Software Package:

Software Name	Purpose
XDS	data scaling
X-PLOR	model building
X-PLOR	refinement
XDS	data reduction
X-PLOR	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 1996-04-03 
Deposition Author(s): Harel, M., Silman, I., Sussman, J.L.

Revision History  

• Version 1.0: 1996-04-03
  Type: Initial release
  
• Version 1.1: 2008-03-24
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2021-06-02
  Changes: Derived calculations
• Version 1.4: 2024-11-13
  Changes: Data collection, Database references, Structure summary