Macromolecule Content

• Total Structure Weight: 7.30 kDa 
• Atom Count: 508 
• Modelled Residue Count: 64 
• Deposited Residue Count: 64 
• Unique protein chains: 1

2B3C

SOLUTION STRUCTURE OF A BETA-NEUROTOXIN FROM THE NEW WORLD SCORPION CENTRUROIDES SCULPTURATUS EWING

• DOI: 10.2210/pdb2B3C/pdb
• BMRB: 4279

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


• Deposited: 1998-12-09 Released: 1998-12-16 
• Deposition Author(s): Jablonsky, M.J., Jackson, P.L., Trent, J.O., Watt, D.D., Krishna, N.R.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 40 
• Conformers Submitted: 1 
• Selection Criteria: LRV 

Literature

Solution structure of a beta-neurotoxin from the New World scorpion Centruroides sculpturatus Ewing.

Jablonsky, M.J., Jackson, P.L., Trent, J.O., Watt, D.D., Krishna, N.R.

(1999) Biochem Biophys Res Commun 254: 406-412

• PubMed: 9918851 
• DOI: 10.1006/bbrc.1998.9904
• Primary Citation of Related Structures:  
  2B3C, 1B3C


• PubMed Abstract: 
  

We report the detailed solution structure of the 7.2 kDa protein CsE-I, a beta-neurotoxin from the New World scorpion Centruroides sculpturatus Ewing. This toxin binds to sodium channels, but unlike the alpha-neurotoxins, shifts the voltage of activation toward more negative potentials causing the membrane to fire spontaneously. Sequence-specific proton NMR assignments were made using 600 MHz 2D-NMR data. Distance geometry and dynamical simulated annealing refinements were performed using experimental distance and torsion angle constraints from NOESY and pH-COSY data. A family of 40 structures without constraint violations was generated, and an energy-minimized average structure was computed. The backbone conformation of the CsE-I toxin shows similar secondary structural features as the prototypical alpha-neurotoxin, CsE-v3, and is characterized by a short 2(1/2)-turn alpha-helix and a 3-strand antiparallel beta-sheet, both held together by disulfide bridges. The RMSD for the backbone atoms between CsE-I and CsE-v3 is 1.48 A. Despite this similarity in the overall backbone folding, the these two proteins show some important differences in the primary structure (sequence) and electrostatic potential surfaces. Our studies provide a basis for unravelling the role of these differences in relation to the known differences in the receptor sites on the voltage sensitive sodium channel for the alpha- and beta-neurotoxins.

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Organizational Affiliation: 

Comprehensive Cancer Center, University of Alabama at Birmingham, Birmingham, Alabama, 35294, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
PROTEIN (NEUROTOXIN CSE-I)	A	64	Centruroides sculpturatus	Mutation(s): 0
UniProt
Find proteins for P01491 (Centruroides sculpturatus) Explore P01491  Go to UniProtKB:  P01491

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 40 
• Conformers Submitted: 1 
• Selection Criteria: LRV 
• OLDERADO: 2B3C Olderado

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1998-12-09 
• Released Date: 1998-12-16 
Deposition Author(s): Jablonsky, M.J., Jackson, P.L., Trent, J.O., Watt, D.D., Krishna, N.R.

Revision History  

• Version 1.0: 1998-12-16
  Type: Initial release
  
• Version 1.1: 2008-04-26
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance