1NE5

Solution Structure of HERG Specific Scorpion Toxin CnErg1

• PDB DOI: https://doi.org/10.2210/pdb1NE5/pdb
• BMRB: 5652

• Classification: TOXIN
• Organism(s): Centruroides noxius
• Mutation(s): No 
• Membrane Protein: Yes  OPM


• Deposited: 2002-12-10 Released: 2003-04-01 
• Deposition Author(s): Torres, A.M., Paramjit, B., Alewood, P., Kuchel, P.W., Vandenberg, J.I.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 4000 
• Conformers Submitted: 20 
• Selection Criteria: structures with the lowest energy 

Literature

Solution structure of CnErg1 (Ergtoxin), a HERG specific scorpion toxin

Torres, A.M., Bansal, P., Alewood, P.F., Bursill, J.A., Kuchel, P.W., Vandenberg, J.I.

(2003) FEBS Lett 539: 138-142

• PubMed: 12650941 
• DOI: https://doi.org/10.1016/s0014-5793(03)00216-3
• Primary Citation of Related Structures:  
  1NE5


• PubMed Abstract: 
  

  The three-dimensional structure of chemically synthesized CnErg1 (Ergtoxin), which specifically blocks HERG (human ether-a-go-go-related gene) K+ channels, was determined by nuclear magnetic resonance spectroscopy. CnErg1 consists of a triple-stranded beta-sheet and an alpha-helix, as is typical of K+ channel scorpion toxins. The peptide structure differs from the canonical structures in that the first beta-strand is shorter and is nearer to the second beta-strand rather than to the third beta-strand on the C-terminus. There is also a large hydrophobic patch on the surface of the toxin, surrounding a central lysine residue, Lys13. We postulate that this hydrophobic patch is likely to form part of the binding surface of the toxin.

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Organizational Affiliation: 

School of Molecular and Microbial Biosciences, University of Sydney, NSW 2006, Australia. [e-mail]

Biological Assembly 1  

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

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 4.75 kDa 
• Atom Count: 324 
• Modelled Residue Count: 42 
• Deposited Residue Count: 42 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
ergtoxin	A	42	N/A	Mutation(s): 0  Membrane Entity: Yes
UniProt
Find proteins for Q86QT3 (Centruroides noxius) Explore Q86QT3  Go to UniProtKB:  Q86QT3

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 4000 
• Conformers Submitted: 20 
• Selection Criteria: structures with the lowest energy 

Structure Validation

Entry History 

Deposition Data

• Released Date: 2003-04-01 
Deposition Author(s): Torres, A.M., Paramjit, B., Alewood, P., Kuchel, P.W., Vandenberg, J.I.

Revision History  

• Version 1.0: 2003-04-01
  Type: Initial release
  
• Version 1.1: 2008-04-28
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2022-02-23
  Changes: Data collection, Database references, Derived calculations