Dimeric conotoxin alphaD-GeXXA

Experimental Data Snapshot

  • Resolution: 1.50 Å
  • R-Value Free: 0.223 
  • R-Value Work: 0.177 
  • R-Value Observed: 0.179 

wwPDB Validation   3D Report Full Report

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Conotoxin alpha D-GeXXA utilizes a novel strategy to antagonize nicotinic acetylcholine receptors

Xu, S.Zhang, T.Kompella, S.N.Yan, M.Lu, A.Wang, Y.Shao, X.Chi, C.Adams, D.J.Ding, J.Wang, C.

(2015) Sci Rep 5: 14261-14261

  • DOI: https://doi.org/10.1038/srep14261
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Nicotinic acetylcholine receptors (nAChRs) play essential roles in transmitting acetylcholine-mediated neural signals across synapses and neuromuscular junctions, and are also closely linked to various diseases and clinical conditions. Therefore, novel nAChR-specific compounds have great potential for both neuroscience research and clinical applications. Conotoxins, the peptide neurotoxins produced by cone snails, are a rich reservoir of novel ligands that target receptors, ion channels and transporters in the nervous system. From the venom of Conus generalis, we identified a novel dimeric nAChR-inhibiting αD-conotoxin GeXXA. By solving the crystal structure and performing structure-guided dissection of this toxin, we demonstrated that the monomeric C-terminal domain of αD-GeXXA, GeXXA-CTD, retains inhibitory activity against the α9α10 nAChR subtype. Furthermore, we identified that His7 of the rat α10 nAChR subunit determines the species preference of αD-GeXXA, and is probably part of the binding site of this toxin. These results together suggest that αD-GeXXA cooperatively binds to two inter-subunit interfaces on the top surface of nAChR, thus allosterically disturbing the opening of the receptor. The novel antagonistic mechanism of αD-GeXXA via a new binding site on nAChRs provides a valuable basis for the rational design of new nAChR-targeting compounds.

  • Organizational Affiliation

    Institute of Protein Research, Tongji University, 1239 Siping Road, Shanghai 200092, China.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
alphaD-conotoxin GeXXA from the venom of Conus generalis
A, B
50Conus generalisMutation(s): 0 
Find proteins for A0A0A0VBX4 (Conus generalis)
Explore A0A0A0VBX4 
Go to UniProtKB:  A0A0A0VBX4
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0A0A0VBX4
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.50 Å
  • R-Value Free: 0.223 
  • R-Value Work: 0.177 
  • R-Value Observed: 0.179 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 25.436α = 90
b = 42.423β = 90
c = 83.013γ = 90
Software Package:
Software NamePurpose
PDB_EXTRACTdata extraction
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2015-12-02
    Type: Initial release
  • Version 1.1: 2020-02-05
    Changes: Data collection, Derived calculations