1BAH

A TWO DISULFIDE DERIVATIVE OF CHARYBDOTOXIN WITH DISULFIDE 13-33 REPLACED BY TWO ALPHA-AMINOBUTYRIC ACIDS, NMR, 30 STRUCTURES


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Submitted: 30 

wwPDB Validation   3D Report Full Report


This is version 2.1 of the entry. See complete history


Literature

NMR solution structure of a two-disulfide derivative of charybdotoxin: structural evidence for conservation of scorpion toxin alpha/beta motif and its hydrophobic side chain packing.

Song, J.Gilquin, B.Jamin, N.Drakopoulou, E.Guenneugues, M.Dauplais, M.Vita, C.Menez, A.

(1997) Biochemistry 36: 3760-3766

  • DOI: 10.1021/bi962720h
  • Primary Citation of Related Structures:  
    1BAH

  • PubMed Abstract: 
  • The alpha/beta scorpion fold consisting of a short alpha-helix and beta-sheet is a structural motif common to scorpion toxins, insect defensins, and plant gamma-thionins that invariably contains three disulfides. CHABII is a two-disulfide derivative of the scorpion toxin charybdotoxin (ChTX), chemically synthesized by inserting two L-alpha-aminobutyric acids in place of the two half-cystine residues involved in the disulfide 13-33 ...

    The alpha/beta scorpion fold consisting of a short alpha-helix and beta-sheet is a structural motif common to scorpion toxins, insect defensins, and plant gamma-thionins that invariably contains three disulfides. CHABII is a two-disulfide derivative of the scorpion toxin charybdotoxin (ChTX), chemically synthesized by inserting two L-alpha-aminobutyric acids in place of the two half-cystine residues involved in the disulfide 13-33. This disulfide is one of the two disulfides which connect the alpha-helix to the beta-sheet. The solution structure of CHABII was determined at pH 6.3 and 5 degrees C using 2D NMR and simulated annealing from 513 distance and 46 dihedral angle constraints. The NMR structure of CHABII is well-defined as judged from the low value of the averaged backbone rms deviation between the 30 lowest energy structures and the energy-minimized mean structure ((rmsd) = 0.65 A for the entire sequence and 0.48 A for the segment 3-36). Analysis and comparison of the solution structures of CHABII and ChTX lead to the following conclusions: (i) the fold of CHABII is similar to that of ChTX as indicated by the low value of the averaged backbone atomic rms deviation between the 10 lowest energy solution structures of the two proteins (1.44 A); (ii) the packing of the hydrophobic core is well-preserved, underlying the critical structural role of the hydrophobic interactions even for such a small and cysteine-rich protein as ChTX.


    Organizational Affiliation

    Département d'Ingénierie et d'Etudes des Protéines, CEA, Saclay, Gif-sur-Yvette, France.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
CHARYBDOTOXINA37Leiurus quinquestriatusMutation(s): 2 
UniProt
Find proteins for P13487 (Leiurus hebraeus)
Explore P13487 
Go to UniProtKB:  P13487
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Modified Residues  2 Unique
IDChainsTypeFormula2D DiagramParent
ABA
Query on ABA
AL-PEPTIDE LINKINGC4 H9 N O2ALA
PCA
Query on PCA
AL-PEPTIDE LINKINGC5 H7 N O3GLN
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Submitted: 30 
  • OLDERADO: 1BAH Olderado

Structure Validation

View Full Validation Report




Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1997-01-11
    Type: Initial release
  • Version 1.1: 2008-03-24
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 2.0: 2019-12-25
    Changes: Database references, Derived calculations, Other, Polymer sequence
  • Version 2.1: 2020-01-15
    Changes: Database references