1CMR

NMR SOLUTION STRUCTURE OF A CHIMERIC PROTEIN, DESIGNED BY TRANSFERRING A FUNCTIONAL SNAKE BETA-HAIRPIN INTO A SCORPION ALPHA/BETA SCAFFOLD (PH 3.5, 20C), NMR, 18 STRUCTURES


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Submitted: 18 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Transfer of a beta-hairpin from the functional site of snake curaremimetic toxins to the alpha/beta scaffold of scorpion toxins: three-dimensional solution structure of the chimeric protein.

Zinn-Justin, S.Guenneugues, M.Drakopoulou, E.Gilquin, B.Vita, C.Menez, A.

(1996) Biochemistry 35: 8535-8543

  • DOI: 10.1021/bi960466n

  • PubMed Abstract: 
  • The alpha/beta scorpion fold is shared by scorpion toxins, insect defensins, and plant thionins. This small and functionally versatile template contains an alpha-helix and a triple beta-sheet linked by three disulfide bridges. With the view to introd ...

    The alpha/beta scorpion fold is shared by scorpion toxins, insect defensins, and plant thionins. This small and functionally versatile template contains an alpha-helix and a triple beta-sheet linked by three disulfide bridges. With the view to introduce novel functional centers within this fold, we replaced the sequence (the cysteines and glycines excepted) of the original beta-hairpin of a scorpion toxin by the sequence of a beta-hairpin that forms part of the site by which snake neurotoxins bind to nicotinic acetylcholine receptors (AcChOR). The resulting chimeric protein, synthesized by chemical means, binds to AcChOR, though with a lower affinity than the snake toxins [Drakopoulou; E., Zinn-Justin, S., Guenneugues, M., Gilquin, B., Ménez, A., & Vita, C. (1996) J. Biol. Chem. 271, 11979-11987]. The work described in this paper is an attempt to clarify the structural consequences associated with the transfer of the beta-hairpin. We report the determination of the three-dimensional solution structure of the chimeric protein by proton NMR spectroscopy and molecular dynamics calculations. Comparison of the structure of the chimera with those of the scorpion alpha/beta toxin and of the snake neurotoxin shows that (i) the new protein folds as an alpha/beta motif and (ii) the beta-hairpins of the chimera and of the curaremimetic toxin adopt a similar conformation. A closer inspection of the differences between the structures of the original and transferred beta-hairpins allows rationalization of the biological properties of the chimera.


    Related Citations: 
    • Changing the Structural Context of a Functional Beta-Hairpin. Synthesis and Characterization of a Chimera Containing the Curaremimetic Loop of a Snake Toxin in the Scorpion Alpha/Beta Scaffold
      Drakopoulou, E.,Zinn-Justin, S.,Guenneugues, M.,Gilquin, B.,Vita, C.,Menez, A.
      () TO BE PUBLISHED --: --


    Organizational Affiliation

    CEA, Département d'Ingénierie et d'Etude des Protéines, Gif-sur-Yvette, France. szinn@balthazar.saclay.cea.fr




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
CHARYBDOTOXIN, ALPHA CHIMERA
A
31Leiurus quinquestriatus hebraeusMutation(s): 8 
Find proteins for P13487 (Leiurus quinquestriatus hebraeus)
Go to UniProtKB:  P13487
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Submitted: 18 
  • Olderado: 1CMR Olderado
Software Package:
Software NamePurpose
X-PLORmodel building
X-PLORphasing
X-PLORrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1996-08-01
    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