2UZ6

AChBP-targeted a-conotoxin correlates distinct binding orientations with nAChR subtype selectivity.


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.236 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Achbp-Targeted Alpha-Conotoxin Correlates Distinct Binding Orientations with Nachr Subtype Selectivity

Dutertre, S.Ulens, C.Buttner, R.Fish, A.Van Elk, R.Kendel, Y.Hopping, G.Alewood, P.F.Schroeder, C.Nicke, A.Smit, A.B.Sixma, T.K.Lewis, R.J.

(2007) Embo J. 26: 3858

  • DOI: 10.1038/sj.emboj.7601785

  • PubMed Abstract: 
  • Neuronal nAChRs are a diverse family of pentameric ion channels with wide distribution throughout cells of the nervous and immune systems. However, the role of specific subtypes in normal and pathological states remains poorly understood due to the l ...

    Neuronal nAChRs are a diverse family of pentameric ion channels with wide distribution throughout cells of the nervous and immune systems. However, the role of specific subtypes in normal and pathological states remains poorly understood due to the lack of selective probes. Here, we used a binding assay based on acetylcholine-binding protein (AChBP), a homolog of the nicotinic acetylcholine ligand-binding domain, to discover a novel alpha-conotoxin (alpha-TxIA) in the venom of Conus textile. Alpha-TxIA bound with high affinity to AChBPs from different species and selectively targeted the alpha(3)beta(2) nAChR subtype. A co-crystal structure of Ac-AChBP with the enhanced potency analog TxIA(A10L), revealed a 20 degrees backbone tilt compared to other AChBP-conotoxin complexes. This reorientation was coordinated by a key salt bridge formed between Arg5 (TxIA) and Asp195 (Ac-AChBP). Mutagenesis studies, biochemical assays and electrophysiological recordings directly correlated the interactions observed in the co-crystal structure to binding affinity at AChBP and different nAChR subtypes. Together, these results establish a new pharmacophore for the design of novel subtype-selective ligands with therapeutic potential in nAChR-related diseases.


    Organizational Affiliation

    Institute for Molecular Bioscience, The University of Queensland, Brisbane, Queensland, Australia.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
SOLUBLE ACETYLCHOLINE RECEPTOR
A, B, C, D, E, F, G, H, I, J
217Aplysia californicaN/A
Find proteins for Q8WSF8 (Aplysia californica)
Go to UniProtKB:  Q8WSF8
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
ALPHA-CONOTOXIN TXIA(A10L)
K, L, M, N, O, P, Q, R, S, T
17N/AN/A
Protein Feature View is not available: No corresponding UniProt sequence found.
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GOL
Query on GOL

Download SDF File 
Download CCD File 
E, G
GLYCEROL
GLYCERIN; PROPANE-1,2,3-TRIOL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
NAG
Query on NAG

Download SDF File 
Download CCD File 
D, H
N-ACETYL-D-GLUCOSAMINE
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
NH2
Query on NH2
K, L, M, N, O, P, Q, R, S, T
NON-POLYMERH2 N

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Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.236 
  • Space Group: P 1
Unit Cell:
Length (Å)Angle (°)
a = 72.540α = 90.14
b = 85.754β = 80.01
c = 121.667γ = 70.64
Software Package:
Software NamePurpose
MOSFLMdata reduction
PHASERphasing
SCALAdata scaling
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2007-08-07
    Type: Initial release
  • Version 1.1: 2013-01-23
    Type: Advisory, Atomic model, Derived calculations, Non-polymer description, Other, Structure summary, Version format compliance