Biological Assembly 1  

 3D View: Structure | 1D-3D View | Validation Report

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 4.21 kDa 
• Atom Count: 287 
• Modelled Residue Count: 40 
• Deposited Residue Count: 40 
• Unique protein chains: 1

1SXM

SCORPION TOXIN (NOXIUSTOXIN) WITH HIGH AFFINITY FOR VOLTAGE DEPENDENT POTASSIUM CHANNEL AND LOW AFFINITY FOR CALCIUM DEPENDENT POTASSIUM CHANNEL (NMR AT 20 DEGREES, PH3.5, 39 STRUCTURES)

• PDB DOI: 10.2210/pdb1SXM/pdb

• Classification: TOXIN
• Organism(s): Centruroides noxius
• Mutation(s): No 


• Deposited: 1995-09-07 Released: 1996-01-29 
• Deposition Author(s): Dauplais, M., Gilquin, B., Possani, L.D., Gurrola-Briones, G., Roumestand, C., Menez, A.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Submitted: 39 

Literature

Determination of the three-dimensional solution structure of noxiustoxin: analysis of structural differences with related short-chain scorpion toxins.

Dauplais, M., Gilquin, B., Possani, L.D., Gurrola-Briones, G., Roumestand, C., Menez, A.

(1995) Biochemistry 34: 16563-16573

• PubMed: 8527429 
• DOI: 10.1021/bi00051a004
• Primary Citation of Related Structures:  
  1SXM


• PubMed Abstract: 
  

The 3D structure of noxiustoxin, the first identified scorpion toxin acting on K+ channels, has been elucidated by NMR and molecular modeling. Thirty-nine solution structures were calculated using 572 distance and 42 dihedral restraints. The average atomic rms deviation between the refined structures and the mean structure is 0.75 A for the backbone atoms. Noxiustoxin adopts a alpha/beta scaffold constituted of a three-stranded beta-sheet (residues 2-3, 25-30, 33-38) linked to a helix (residues 10-20) through two disulfide bridges. A comparison between the 3D structure of noxiustoxin and those of other structurally and functionally related scorpion toxins (charybdotoxin, PO5-NH2, kaliotoxin) revealed a bending capacity of the helix and a variability in the relative orientations between the helix and the beta-sheet. These two features highlight the plasticity of the alpha/beta scaffold and offer a structural explanation for the capacity of the fold to accommodate an additional alanine residue in the Gly-x-Cys pattern of a previously proposed consensus sequence [Bontems et al. (1991) Science 254, 1521-1523]. Our structural data also emphasize the possibility that the beta-sheet of NTX is implicated in the capacity of NTX to recognize voltage-dependent K+ channels.

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Organizational Affiliation: 

Département d'Ingénierie et d'Etude des Protéines, CE-Saclay, Gif-sur-Yvette, France.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
NOXIUSTOXIN	A	40	Centruroides noxius	Mutation(s): 0
UniProt
Find proteins for P08815 (Centruroides noxius) Explore P08815  Go to UniProtKB:  P08815

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Submitted: 39 
• OLDERADO: 1SXM Olderado

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1995-09-07 
• Released Date: 1996-01-29 
Deposition Author(s): Dauplais, M., Gilquin, B., Possani, L.D., Gurrola-Briones, G., Roumestand, C., Menez, A.

Revision History  

• Version 1.0: 1996-01-29
  Type: Initial release
  
• Version 1.1: 2008-03-24
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2022-03-02
  Changes: Database references, Derived calculations, Other