2KJA

Chemical shift assignments, constraints, and coordinates for CN5 scorpion toxin


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 200 
  • Conformers Submitted: 15 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Solution structure of Cn5, a crustacean toxin found in the venom of the scorpions Centruroides noxius and Centruroides suffusus suffusus.

Corzo, G.Prochnicka-Chalufour, A.Garcia, B.I.Possani, L.D.Delepierre, M.

(2009) Biochim Biophys Acta 1794: 1591-1598

  • DOI: 10.1016/j.bbapap.2009.07.006
  • Primary Citation of Related Structures:  
    2KJA

  • PubMed Abstract: 
  • The crustacean toxin Cn5 from Centruroides noxius Hoffmann and peptide Css39.8 from Centruroides suffusus suffusus scorpion venoms are identical peptides, as confirmed by amino acid sequence of purified toxins and by DNA sequencing of the two respective cloned genes ...

    The crustacean toxin Cn5 from Centruroides noxius Hoffmann and peptide Css39.8 from Centruroides suffusus suffusus scorpion venoms are identical peptides, as confirmed by amino acid sequence of purified toxins and by DNA sequencing of the two respective cloned genes. Therefore in this communication they will be simply named Cn5. Cn5 is a 66 amino acid long peptide with four disulfide bridges, formed between pairs of cysteines: C1-C8, C2-C5, C3-C6, and C4-C7 (the numbers indicate the relative positions of the cysteine residues in the primary structure). This peptide is non-toxic to mammals but deadly to arthropods (LD(50) 28.5 mg/g body weight of crayfish). Its three-dimensional structure was determined by NMR using a total of 965 meaningful distance constraints derived from the volume integration of the 2D NOESY spectra. The Cn5 structure displays a mixed alpha/beta fold stabilized by four disulfide bridges, with a kink induced by a cis-proline in its C-terminal part. Cn5 electrostatic surface is compared to that of Cn2 toxin toxic to mammals. The local differences produced by additional or substituted residues that would influence toxin selectivity towards mammalian or crustacean Na(+) channels are discussed.


    Organizational Affiliation

    Departamento de Medicina Molecular y Bioprocesos, Instituto de Biotecnología, Universidad Nacional Autónoma de México, UNAM, Apartado Postal 510-3, Cuernavaca Morelos, 62210, Mexico.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Beta-toxin Cn5A66Centruroides noxiusMutation(s): 0 
Membrane Entity: Yes 
UniProt
Find proteins for P45663 (Centruroides noxius)
Explore P45663 
Go to UniProtKB:  P45663
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 200 
  • Conformers Submitted: 15 
  • Selection Criteria: structures with the lowest energy 
  • OLDERADO: 2KJA Olderado

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2009-10-06
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance