2BR7

Crystal Structure of Acetylcholine-binding Protein (AChBP) from Aplysia californica in complex with HEPES


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Free: 0.249 
  • R-Value Work: 0.174 
  • R-Value Observed: 0.178 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Crystal Structure of Nicotinic Acetylcholine Receptor Homolog Achbp in Complex with an Alpha- Conotoxin Pnia Variant

Celie, P.H.N.Kasheverov, I.E.Mordvintsev, D.Y.Hogg, R.C.Van Nierop, P.Van Elk, R.Van Rossum-Fikkert, S.E.Zhmak, M.N.Bertrand, D.Tsetlin, V.Sixma, T.K.Smit, A.B.

(2005) Nat Struct Mol Biol 12: 582

  • DOI: https://doi.org/10.1038/nsmb951
  • Primary Citation of Related Structures:  
    2BR7, 2BR8

  • PubMed Abstract: 

    Conotoxins (Ctx) form a large family of peptide toxins from cone snail venoms that act on a broad spectrum of ion channels and receptors. The subgroup alpha-Ctx specifically and selectively binds to subtypes of nicotinic acetylcholine receptors (nAChRs), which are targets for treatment of several neurological disorders. Here we present the structure at a resolution of 2.4 A of alpha-Ctx PnIA (A10L D14K), a potent blocker of the alpha(7)-nAChR, bound with high affinity to acetylcholine binding protein (AChBP), the prototype for the ligand-binding domains of the nAChR superfamily. Alpha-Ctx is buried deep within the ligand-binding site and interacts with residues on both faces of adjacent subunits. The toxin itself does not change conformation, but displaces the C loop of AChBP and induces a rigid-body subunit movement. Knowledge of these contacts could facilitate the rational design of drug leads using the Ctx framework and may lead to compounds with increased receptor subtype selectivity.


  • Organizational Affiliation

    Division of Molecular Carcinogenesis, Netherlands Cancer Institute, Plesmanlaan 121, 1066 CX Amsterdam, The Netherlands.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
SOLUBLE ACETYLCHOLINE RECEPTOR
A, B, C, D, E
217Aplysia californicaMutation(s): 0 
UniProt
Find proteins for Q8WSF8 (Aplysia californica)
Explore Q8WSF8 
Go to UniProtKB:  Q8WSF8
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ8WSF8
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Free: 0.249 
  • R-Value Work: 0.174 
  • R-Value Observed: 0.178 
  • Space Group: I 2 3
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 204.203α = 90
b = 204.203β = 90
c = 204.203γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
MOSFLMdata reduction
SCALAdata scaling
AMoREphasing

Structure Validation

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Entry History 

Revision History  (Full details and data files)

  • Version 1.0: 2005-06-07
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Advisory, Version format compliance
  • Version 1.2: 2023-12-13
    Changes: Data collection, Database references, Other, Refinement description
  • Version 1.3: 2024-10-09
    Changes: Structure summary