1NOT

THE 1.2 ANGSTROM STRUCTURE OF G1 ALPHA CONOTOXIN


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.20 Å
  • R-Value Free: 0.222 
  • R-Value Work: 0.178 
  • R-Value Observed: 0.178 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

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: 10.1021/bi960820h
  • Primary Citation of Related Structures:  
    1NOT

  • 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 ...

    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.


    Related Citations: 
    • Solution Structures of Alpha-Conotoxin G1 Determined by Two-Dimensional NMR Spectroscopy
      Pardi, A., Galdes, A., Florance, J., Maniconte, D.
      (1989) Biochemistry 28: 5494

    Organizational Affiliation

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



Macromolecules

Find similar proteins by:  Sequence   |   3D Structure  

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
GI ALPHA CONOTOXINA14Conus geographusMutation(s): 0 
UniProt
Find proteins for P0DQR7 (Conus geographus)
Explore P0DQR7 
Go to UniProtKB:  P0DQR7
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0DQR7
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • 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
X-PLORrefinement
PROCESSdata scaling
SHAKE-N-BAKEphasing

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