Experimental Data Snapshot

  • Resolution: 2.85 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.190 
  • R-Value Observed: 0.190 

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Structure of a Complex of the Potent and Specific Inhibitor Bw284C51 with Torpedo Californica Acetylcholinesterase

Felder, C.E.Harel, M.Silman, I.Sussman, J.L.

(2002) Acta Crystallogr D Biol Crystallogr 58: 1765

  • DOI: https://doi.org/10.1107/s0907444902011642
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The X-ray crystal structure of Torpedo californica acetylcholinesterase (TcAChE) complexed with BW284C51 [CO[-CH(2)CH(2)-pC(6)H(4)-N(CH(3))(2)(CH(2)-CH=CH(2))](2)] is described and compared with the complexes of two other active-site gorge-spanning inhibitors, decamethonium and E2020. The inhibitor was soaked into TcAChE crystals in the trigonal space group P3(1)21, yielding a complex which diffracted to 2.85 A resolution. The structure was refined to an R factor of 19.0% and an R(free) of 23.4%; the final model contains the protein, inhibitor, 132 water molecules and three carbohydrate moieties. BW284C51 binds similarly to decamethonium and E2020, with its two phenyl and quaternary amino end-groups complexed to Trp84 in the catalytic site and to Trp279 in the peripheral binding site, and its central carbonyl group hydrogen bonded very weakly to Tyr121. Possible reasons for decamethonium's weaker binding are considered. The relative strength of binding of bisquaternary inhibitors to acetylcholinesterase and the effect of several mutations of the enzyme are discussed in the context of the respective X-ray structures of their complexes with the enzyme.

  • Organizational Affiliation

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

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
ACETYLCHOLINESTERASE543Tetronarce californicaMutation(s): 0 
Find proteins for P04058 (Tetronarce californica)
Explore P04058 
Go to UniProtKB:  P04058
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP04058
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.85 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.190 
  • R-Value Observed: 0.190 
  • Space Group: P 31 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 114α = 90
b = 114β = 90
c = 138.2γ = 120
Software Package:
Software NamePurpose
XDSdata reduction
XDSdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2000-07-03
    Type: Initial release
  • Version 1.1: 2011-09-21
    Changes: Advisory, Atomic model, Data collection, Derived calculations, Non-polymer description, Other, Refinement description, Structure summary, Version format compliance
  • Version 1.2: 2017-07-05
    Changes: Data collection
  • Version 1.3: 2017-07-12
    Changes: Advisory
  • Version 1.4: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Data collection, Derived calculations, Other, Structure summary
  • Version 1.5: 2023-12-13
    Changes: Data collection, Database references, Refinement description, Structure summary