1CHL

NMR SEQUENTIAL ASSIGNMENTS AND SOLUTION STRUCTURE OF CHLOROTOXIN, A SMALL SCORPION TOXIN THAT BLOCKS CHLORIDE CHANNELS


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Submitted: 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

NMR sequential assignments and solution structure of chlorotoxin, a small scorpion toxin that blocks chloride channels.

Lippens, G.Najib, J.Wodak, S.J.Tartar, A.

(1995) Biochemistry 34: 13-21


  • PubMed Abstract: 
  • The solution structure of chlorotoxin, a small toxin purified from the venom of the Leiurus quinquestriatus scorpion, has been determined using 2D 1H NMR spectroscopy. Analysis of the NMR data shows that the structure consists of a small three-strand ...

    The solution structure of chlorotoxin, a small toxin purified from the venom of the Leiurus quinquestriatus scorpion, has been determined using 2D 1H NMR spectroscopy. Analysis of the NMR data shows that the structure consists of a small three-stranded antiparallel beta-sheet packed against an alpha-helix, thereby adopting the same fold as charybdotoxin and other members of the short scorpion toxin family [Arseniev et al. (1984) FEBS Lett. 165, 57-62; Martins et al. (1990) FEBS Lett. 260, 249-253; Bontems et al. (1991) Science 254, 1521-1523]. Three disulfide bonds of chlorotoxin (Cys5-Cys28, Cys16-Cys33, and Cys20-Cys35), cross-linking the alpha-helix to the beta-sheet, follow the common pattern found in the other short scorpion toxins. The fourth disulfide bridge (Cys2-Cys19) links the small N-terminal beta strand to the rest of the molecule, in contrast to charybdotoxin where this disulfide bridge is absent and the first strand interacts with the rest of the molecule by several contacts between hydrophobic residues. Another structural difference between chlorotoxin and charybdotoxin is observed at the level of the alpha-beta turn. This difference is accompanied by a change in the electrostatic potential surface, which is largely positive at the level of this turn in chlorotoxin, whereas no such positive potential surface can be found at the same position in charybdotoxin. In the latter protein, the positive surface is formed by different charged residues situated on the solvent-exposed site of the C-terminal beta-sheet.(ABSTRACT TRUNCATED AT 250 WORDS)


    Related Citations: 
    • Purification and Characterization of Chloraphyllin, a Chloride Channel Ligand from the Venom of the Scorpion Leiurus Quinquestriatus Quinquestriatus
      Debin, J.A.,Maggio, J.E.,Strichartz, G.R.
      (1993) Am.J.Physiol. 264: C361


    Organizational Affiliation

    Service de Chimie des Biomol├ęcules (SCBM), Institut Pasteur de Lille, France.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
CHLOROTOXIN
A
36Leiurus quinquestriatus quinquestriatusMutation(s): 0 
Find proteins for P45639 (Leiurus quinquestriatus quinquestriatus)
Go to UniProtKB:  P45639
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Submitted: 
  • Olderado: 1CHL Olderado
Software Package:
Software NamePurpose
X-PLORmodel building
X-PLORrefinement
X-PLORphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1995-02-07
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2017-11-29
    Type: Derived calculations, Other