1H5O

Solution structure of Crotamine, a neurotoxin from Crotalus durissus terrificus


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 26 
  • Selection Criteria: LEAST RESTRAINT VIOLATION, LEAST RESIDUAL DEVIATIONS FROM IDEALIZED GEOMETRY 

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This is version 1.1 of the entry. See complete history

Literature

Solution Structure of Crotamine, a Na+ Channel Affecting Toxin from Crotalus Durissus Terrificus Venom

Nicastro, G.Franzoni, L.De Chiara, C.Mancin, A.C.A.Giglio, J.R.Spisni, A.

(2003) Eur.J.Biochem. 270: 1969


  • PubMed Abstract: 
  • Crotamine is a component of the venom of the snake Crotalus durissus terrificus and it belongs to the myotoxin protein family. It is a 42 amino acid toxin cross-linked by three disulfide bridges and characterized by a mild toxicity (LD50 = 820 micro ...

    Crotamine is a component of the venom of the snake Crotalus durissus terrificus and it belongs to the myotoxin protein family. It is a 42 amino acid toxin cross-linked by three disulfide bridges and characterized by a mild toxicity (LD50 = 820 micro g per 25 g body weight, i.p. injection) when compared to other members of the same family. Nonetheless, it possesses a wide spectrum of biological functions. In fact, besides being able to specifically modify voltage-sensitive Na+ channel, it has been suggested to exhibit analgesic activity and to be myonecrotic. Here we report its solution structure determined by proton NMR spectroscopy. The secondary structure comprises a short N-terminal alpha-helix and a small antiparallel triple-stranded beta-sheet arranged in an alphabeta1beta2beta3 topology never found among toxins active on ion channels. Interestingly, some scorpion toxins characterized by a biological activity on Na+ channels similar to the one reported for crotamine, exhibit an alpha/beta fold, though with a beta1alphabeta2beta3 topology. In addition, as the antibacterial beta-defensins, crotamine interacts with lipid membranes. A comparison of crotamine with human beta-defensins shows a similar fold and a comparable net positive potential surface. To the best of our knowledge, this is the first report on the structure of a toxin from snake venom active on Na+ channel.


    Related Citations: 
    • The Analgesic Activity of Crotamine,A Neurotoxin from Crotalus Durissus Terrificus Venom:A Biochemical and Pharmacological Study
      Mancin, A.C.,Soares, A.M.,Andriao-Escarso, S.H.,Faca, V.M.,Greene, L.J.,Zuccolotto, S.,Pela, I.R.,Giglio, J.R.
      (1998) Toxicon 36: 1927


    Organizational Affiliation

    Department of Experimental Medicine, Section of Chemistry and Structural Biochemistry, University of Parma, Italy.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
MYOTOXIN
A
42Crotalus durissus terrificusMutation(s): 0 
Gene Names: CRO2 (CRT-P1)
Find proteins for Q9PWF3 (Crotalus durissus terrificus)
Go to UniProtKB:  Q9PWF3
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 26 
  • Selection Criteria: LEAST RESTRAINT VIOLATION, LEAST RESIDUAL DEVIATIONS FROM IDEALIZED GEOMETRY 
  • Olderado: 1H5O Olderado

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2003-05-09
    Type: Initial release
  • Version 1.1: 2013-07-24
    Type: Derived calculations, Other, Structure summary, Version format compliance