Experimental Data Snapshot

  • Resolution: 1.20 Å
  • R-Value Free: 0.222 
  • R-Value Work: 0.178 
  • R-Value Observed: 0.178 

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This is version 1.2 of the entry. See complete history


Three-dimensional structure of the alpha-conotoxin GI at 1.2 A resolution

Guddat, L.W.Martin, J.L.Shan, L.Edmundson, A.B.Gray, W.R.

(1996) Biochemistry 35: 11329-11335

  • DOI: https://doi.org/10.1021/bi960820h
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Predatory marine snails of the genus Conus paralyze their fish prey by injecting a potent toxin. The alpha-conotoxin GI is a 13-residue peptide isolated from venom of Conus geographus. It functions by blocking the postsynaptic nicotinic acetylcholine receptor. After crystallization in deionized water, the three-dimensional structure of the GI neurotoxin was determined to 1.2 A resolution by X-ray crystallography. This structure, which can be described as a triangular slab, shows overall similarities to those derived by NMR, CD, and predictive methods. The principal framework of the molecule is provided by two disulfide bonds, one linking Cys 2 and Cys 7 and the other Cys 3 and Cys 13. Opposite ends of the sequence are drawn together even further by hydrogen bonds between Glu 1 and Cys 13 and between Cys 2 and Ser 12. Since the C-terminus is amidated, only one negative charge is present (carboxylate of Glu 1), and this is not implicated in receptor binding. Two positively charged regions (the alpha-amino group of Glu 1 and the guanido group of Arg 9) are situated 15 A apart at the corners of the triangular face of the molecule. phi, psi angles characteristic of a 3(10) helix were observed for residues 5-7. For residues 8-11, these angles were consistent with either a type I beta-turn or a distorted 3(10) helix.

  • Organizational Affiliation

    Centre for Drug Design and Development, University of Queensland, St. Lucia, Australia.


Find similar proteins by:  Sequence   |   3D Structure  

Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
GI ALPHA CONOTOXIN14Conus geographusMutation(s): 0 
Find proteins for P0DQR7 (Conus geographus)
Explore P0DQR7 
Go to UniProtKB:  P0DQR7
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0DQR7
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.20 Å
  • R-Value Free: 0.222 
  • R-Value Work: 0.178 
  • R-Value Observed: 0.178 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 14.9α = 90
b = 14.6β = 100.29
c = 22.6γ = 90
Software Package:
Software NamePurpose
PROCESSdata collection
PROCESSdata reduction
SHAKE-N-BAKEmodel building
PROCESSdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1996-12-07
    Type: Initial release
  • Version 1.1: 2008-03-24
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance