2UZ6

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


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.236 
  • R-Value Observed: 0.237 

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Ligand Structure Quality Assessment 


This is version 1.2 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
  • Primary Citation of Related Structures:  
    2UZ6

  • 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 lack of selective probes ...

    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:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
SOLUBLE ACETYLCHOLINE RECEPTOR
A, B, C, D, E, F, G, H
A, B, C, D, E, F, G, H, I, J
217Aplysia californicaMutation(s): 0 
UniProt
Find proteins for Q8WSF8 (Aplysia californica)
Explore Q8WSF8 
Go to UniProtKB:  Q8WSF8
Protein Feature View
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  • Reference Sequence
  • Find similar proteins by:  Sequence   |   Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
ALPHA-CONOTOXIN TXIA(A10L)
K, L, M, N, O, P, Q, R
K, L, M, N, O, P, Q, R, S, T
17Conus textileMutation(s): 0 
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NAG (Subject of Investigation/LOI)
Query on NAG

Download Ideal Coordinates CCD File 
U [auth D], X [auth H]2-acetamido-2-deoxy-beta-D-glucopyranose
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
 Ligand Interaction
GOL
Query on GOL

Download Ideal Coordinates CCD File 
V [auth E], W [auth G]GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.236 
  • R-Value Observed: 0.237 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 72.54α = 90.14
b = 85.754β = 80.01
c = 121.667γ = 70.64
Software Package:
Software NamePurpose
REFMACrefinement
MOSFLMdata reduction
SCALAdata scaling
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment  



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2007-08-07
    Type: Initial release
  • Version 1.1: 2013-01-23
    Changes: Advisory, Atomic model, Derived calculations, Non-polymer description, Other, Structure summary, Version format compliance
  • Version 1.2: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Advisory, Data collection, Derived calculations, Other, Structure summary