1OCE

ACETYLCHOLINESTERASE (E.C. 3.1.1.7) COMPLEXED WITH MF268


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.291 
  • R-Value Work: 0.208 
  • R-Value Observed: 0.208 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

"Back door" opening implied by the crystal structure of a carbamoylated acetylcholinesterase.

Bartolucci, C.Perola, E.Cellai, L.Brufani, M.Lamba, D.

(1999) Biochemistry 38: 5714-5719

  • DOI: 10.1021/bi982723p
  • Primary Citation of Related Structures:  
    1OCE

  • PubMed Abstract: 
  • The crystal structure of Torpedo californica (Tc) acetylcholinesterase (AChE) carbamoylated by the physostigmine analogue 8-(cis-2,6-dimethylmorpholino)octylcarbamoyleseroline (MF268) is reported at 2.7 A resolution. In the X-ray structure, the dimethylmorpholinooctylcarbamic moiety of MF268 is covalently bound to the catalytic serine, which is located at the bottom of a long and narrow gorge ...

    The crystal structure of Torpedo californica (Tc) acetylcholinesterase (AChE) carbamoylated by the physostigmine analogue 8-(cis-2,6-dimethylmorpholino)octylcarbamoyleseroline (MF268) is reported at 2.7 A resolution. In the X-ray structure, the dimethylmorpholinooctylcarbamic moiety of MF268 is covalently bound to the catalytic serine, which is located at the bottom of a long and narrow gorge. The alkyl chain of the inhibitor fills the upper part of the gorge, blocking the entrance of the active site. This prevents eseroline, the leaving group of the carbamoylation process, from exiting through this path. Surprisingly, the relatively bulky eseroline is not found in the crystal structure, thus implying the existence of an alternative route for its clearance. This represents indirect evidence that a "back door" opening may occur and shows that the release of products via a "back door" is a likely alternative for this enzyme. However, its relevance as far as the mechanism of substrate hydrolysis is concerned needs to be established. This study suggests that the use of properly designed acylating inhibitors, which can block the entrance of catalytic sites, may be exploited as a general approach for investigating the existence of "back doors" for the clearance of products.


    Related Citations: 
    • Long Chain Analogs of Physostigmine as Potential Drugs for Alzheimer'S Disease: New Insights Into the Mechanism of Action in the Inhibition of Acetylcholinesterase
      Perola, E., Cellai, L., Lamba, D., Filocamo, L., Brufani, M.
      (1997) Biochim Biophys Acta 1343: 41
    • Effects of Mf-268, a New Cholinesterase Inhibitor, on Acetylcholine and Biogenic Amines in Rat Cortex
      Zhu, X.D., Cuadra, G., Brufani, M., Maggi, T., Pagella, P.G., Williams, E., Giacobini, E.
      (1996) J Neurosci Res 43: 120
    • Synthesis and Structure-Activity Relationships of New Acetylcholinesterase Inhibitors: Morpholinoalkylcarbamoyloxyeseroline Derivatives
      Alisi, M.A., Brufani, M., Filocamo, L., Gostoli, G., Licandro, E., Cesta, M.C., Lappa, S., Marchesini, D., Pagella, P.
      (1995) Bioorg Med Chem Lett 5: 2077
    • Atomic Structure of Acetylcholinesterase from Torpedo Californica: A Prototypic Acetylcholine-Binding Protein
      Sussman, J.L., Harel, M., Frolow, F., Oefner, C., Goldman, A., Toker, L., Silman, I.
      (1991) Science 253: 872

    Organizational Affiliation

    Istituto di Strutturistica Chimica "G. Giacomello", CNR, Rome, Italy.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
ACETYLCHOLINESTERASEA537Tetronarce californicaMutation(s): 0 
Gene Names: ache
EC: 3.1.1.7
UniProt
Find proteins for P04058 (Tetronarce californica)
Explore P04058 
Go to UniProtKB:  P04058
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MF2
Query on MF2

Download Ideal Coordinates CCD File 
B [auth A]CIS-2,6-DIMETHYLMORPHOLINOOCTYLCARBAMYLESEROLINE
C15 H30 N2 O2
UXVBAZRPAJEAHR-GASCZTMLSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.291 
  • R-Value Work: 0.208 
  • R-Value Observed: 0.208 
  • Space Group: P 31 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 111.496α = 90
b = 111.496β = 90
c = 137.39γ = 120
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
X-PLORmodel building
X-PLORrefinement
X-PLORphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1999-05-18
    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: Advisory, Derived calculations