Biological Assembly 1  

 3D View: Structure

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Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 1442.65 
• Atom Count: 97 
• Residue Count: 14 
• Unique protein chains: 1

1NOT

THE 1.2 ANGSTROM STRUCTURE OF G1 ALPHA CONOTOXIN

• DOI: 10.2210/pdb1NOT/pdb

• Classification: CONOTOXIN
• Organism(s): Conus geographus


• Deposited: 1996-05-02 Released: 1996-12-07 
• Deposition Author(s): Guddat, L.W., Shan, L., Martin, J.L., Edmundson, A.B., Gray, W.R.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.2 Å
• R-Value Free: 0.222 
• R-Value Work: 0.178 

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

• PubMed: 8784187 
• 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 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.

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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




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Organizational Affiliation: 

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

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
GI ALPHA CONOTOXIN	A	14	Conus geographus	Mutation(s): 0
Find proteins for P01519 (Conus geographus) Go to UniProtKB:  P01519

Small Molecules

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
NH2	A	NON-POLYMER	H2 N		--

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 = 14.900	α = 90.00
b = 14.600	β = 100.29
c = 22.600	γ = 90.00

Software Package:

Software Name	Purpose
SHAKE-N-BAKE	phasing
SHAKE-N-BAKE	model building
PROCESS	data reduction
PROCESS	data scaling
X-PLOR	refinement
PROCESS	data collection

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1996-05-02 
• Released Date: 1996-12-07 
• Deposition Author(s): Guddat, L.W., Shan, L., Martin, J.L., Edmundson, A.B., Gray, W.R.

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