1NOT

THE 1.2 ANGSTROM STRUCTURE OF G1 ALPHA CONOTOXIN


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.2 Å
  • R-Value Free: 0.222 
  • R-Value Work: 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

  • 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 ...

    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  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
GI ALPHA CONOTOXIN
A
14Conus geographusMutation(s): 0 
Find proteins for P01519 (Conus geographus)
Go to UniProtKB:  P01519
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
NH2
Query on NH2
A
NON-POLYMERH2 N

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Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.2 Å
  • R-Value Free: 0.222 
  • R-Value Work: 0.178 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 14.900α = 90.00
b = 14.600β = 100.29
c = 22.600γ = 90.00
Software Package:
Software NamePurpose
SHAKE-N-BAKEphasing
SHAKE-N-BAKEmodel building
PROCESSdata reduction
PROCESSdata scaling
X-PLORrefinement
PROCESSdata collection

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

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