1LQQ

ANTI-MAMMAL AND ANTI-INSECT LQQIII SCORPION TOXIN, NMR, 15 STRUCTURES


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 30 
  • Conformers Submitted: 15 
  • Selection Criteria: LEAST RESTRAINT VIOLATIONS, LEAST RESIDUAL DEVIATIONS FROM IDEALIZED GEOMETRY 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

1H-NMR-derived secondary structure and the overall fold of the potent anti-mammal and anti-insect toxin III from the scorpion Leiurus quinquestriatus quinquestriatus.

Landon, C.Cornet, B.Bonmatin, J.M.Kopeyan, C.Rochat, H.Vovelle, F.Ptak, M.

(1996) Eur.J.Biochem. 236: 395-404


  • PubMed Abstract: 
  • We describe the secondary structure and the overall fold of toxin III from the venom of the scorpion Leiurus quinquestriatus quinquestriatus determined using two-dimensional-1H-NMR spectroscopy. This protein, which contains 64 amino acids and 4 disul ...

    We describe the secondary structure and the overall fold of toxin III from the venom of the scorpion Leiurus quinquestriatus quinquestriatus determined using two-dimensional-1H-NMR spectroscopy. This protein, which contains 64 amino acids and 4 disulfide bridges, belongs to the long-chain toxin category and is highly toxic to both mammals and insects. The overall fold was determined on the basis of 1208 inter-proton-distance restraints derived from NOE measurements and 90 psi, phi dihedral-angle restraints derived from NOE connectivities and 3JNH-alphaH coupling constants using the HABAS program. This fold, which mainly consists of an alpha-helix packed against a small antiparallel three-stranded beta-sheet, and of several turns and loops, is similar to that of other long-chain scorpion toxins. Aromatic and non-polar residues form several patches on the surface of the protein which alternate with patches of charged and polar residues. Such a topology should be important in the interactions of toxin III with sodium channels in membranes. Two weakly constrained loops introduce some flexibility to the structure which could be related to the activity of this toxin. The central core of toxin III is compared with the cysteine-stabilized alpha beta motif (an alpha-helix connected to a beta-sheet through two disulfide bridges) found in insect defensins and plant thionins. Defensins and thionins are small proteins (approximately 40--50 amino acid residues) containing three or four disulfide bridges, respectively. This comparison confirms that the cysteine-stabilized alpha beta motif is a common core to a number of small proteins from different origins and having different activities.


    Related Citations: 
    • Refined Solution Structure of the Anti-Mammal and Anti-Insect Lqqiii Scorpion Toxin: Comparison with Other Scorpion Toxins
      Landon, C.,Sodano, P.,Cornet, B.,Bonmatin, J.M.,Kopeyan, C.,Rochat, H.,Vovelle, F.,Ptak, M.
      (1997) Proteins 28: 360
    • Characterization of Toxin III of the Scorpion Leiurus Quinquestriatus Quinquestriatus: A New Type of Alpha-Toxin Highly Toxic Both to Mammals and Insects
      Kopeyan, C.,Mansuelle, P.,Martin-Eauclaire, M.F.,Rochat, H.,Miranda, F.
      (1993) Nat.Toxins 1: 308


    Organizational Affiliation

    Centre de Biophysique Móleculaire (CNRS), Orléans, France.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
LQQIII
A
64Leiurus quinquestriatus quinquestriatusN/A
Find proteins for P01487 (Leiurus quinquestriatus quinquestriatus)
Go to UniProtKB:  P01487
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 30 
  • Conformers Submitted: 15 
  • Selection Criteria: LEAST RESTRAINT VIOLATIONS, LEAST RESIDUAL DEVIATIONS FROM IDEALIZED GEOMETRY 
  • Olderado: 1LQQ 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: 1998-05-20
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance