1G9P

SOLUTION STRUCTURE OF THE INSECTICIDAL CALCIUM CHANNEL BLOCKER OMEGA-ATRACOTOXIN-HV2A

• PDB DOI: https://doi.org/10.2210/pdb1G9P/pdb
• BMRB: 4923

• Classification: TOXIN
• Organism(s): Hadronyche versuta
• Mutation(s): No 


• Deposited: 2000-11-27 Released: 2002-02-21 
• Deposition Author(s): Wang, X.-H., King, G.F.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 100 
• Conformers Submitted: 20 
• Selection Criteria: structures with the lowest energy 

Literature

Discovery and structure of a potent and highly specific blocker of insect calcium channels.

Wang, X.H., Connor, M., Wilson, D., Wilson, H.I., Nicholson, G.M., Smith, R., Shaw, D., Mackay, J.P., Alewood, P.F., Christie, M.J., King, G.F.

(2001) J Biol Chem 276: 40306-40312

• PubMed: 11522785 
• DOI: https://doi.org/10.1074/jbc.M105206200
• Primary Citation of Related Structures:  
  1G9P, 1HP3


• PubMed Abstract: 
  

  We have isolated a novel family of insect-selective neurotoxins that appear to be the most potent blockers of insect voltage-gated calcium channels reported to date. These toxins display exceptional phylogenetic specificity, with at least a 10,000-fold preference for insect versus vertebrate calcium channels. The structure of one of the toxins reveals a highly structured, disulfide-rich core and a structurally disordered C-terminal extension that is essential for channel blocking activity. Weak structural/functional homology with omega-agatoxin-IVA/B, the prototypic inhibitor of vertebrate P-type calcium channels, suggests that these two toxin families might share a similar mechanism of action despite their vastly different phylogenetic specificities.

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Organizational Affiliation: 

Department of Biochemistry, University of Connecticut Health Center, Farmington, CT 06032, USA.

Biological Assembly 1  

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

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 4.49 kDa 
• Atom Count: 308 
• Modelled Residue Count: 45 
• Deposited Residue Count: 45 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
OMEGA-ATRACOTOXIN-HV2A	A	45	Hadronyche versuta	Mutation(s): 0
UniProt
Find proteins for P82852 (Hadronyche versuta) Explore P82852  Go to UniProtKB:  P82852

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 100 
• Conformers Submitted: 20 
• Selection Criteria: structures with the lowest energy 

Structure Validation

Entry History 

Deposition Data

• Released Date: 2002-02-21 
Deposition Author(s): Wang, X.-H., King, G.F.

Revision History  

• Version 1.0: 2002-02-21
  Type: Initial release
  
• Version 1.1: 2008-04-27
  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
• Version 1.4: 2024-10-16
  Changes: Data collection, Structure summary