2BR8

Crystal Structure of Acetylcholine-binding Protein (AChBP) from Aplysia californica in complex with an alpha-conotoxin PnIA variant


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Free: 0.250 
  • R-Value Work: 0.198 

wwPDB Validation 3D Report Full Report


This is version 1.2 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: 10.1038/nsmb951
  • Primary Citation of Related Structures:  2BR7

  • 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 (nACh ...

    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: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
SOLUBLE ACETYLCHOLINE RECEPTOR
A, B, C, D, E
217Aplysia californicaN/A
Find proteins for Q8WSF8 (Aplysia californica)
Go to UniProtKB:  Q8WSF8
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
ALPHA-CONOTOXIN PNIA
F, G, H, I, J
17Conus pennaceusN/A
Find proteins for P50984 (Conus pennaceus)
Go to UniProtKB:  P50984
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download SDF File 
Download CCD File 
C, E, F, G, I
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
NH2
Query on NH2
F, G, H, I, J
NON-POLYMERH2 N

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Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Free: 0.250 
  • R-Value Work: 0.198 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 67.473α = 90.00
b = 80.085β = 93.20
c = 134.043γ = 90.00
Software Package:
Software NamePurpose
REFMACrefinement
SCALAdata scaling
AMoREphasing
MOSFLMdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2005-06-07
    Type: Initial release
  • Version 1.1: 2011-05-08
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance