Document Detail

Solution structure of Lqh-8/6, a toxin-like peptide from a scorpion venom--structural heterogeneity induced by proline cis/trans isomerization.
MedLine Citation:
PMID:  9210487     Owner:  NLM     Status:  MEDLINE    
Lqh-8/6 is a minor fraction isolated from the venom of the scorpion Leiurus quinquestriatus hebraeus. Here we describe the purification, amino acid sequencing and solution structure determination by NMR and molecular modeling of this peptide. Lqh-8/6 is a small polypeptide (38 residues) which contains 8 half-cystines and is highly similar to another venom component, chlorotoxin. Standard homonuclear methods were used to sequentially assign the proton NMR spectra and to collect spatial restraints for structure determination. Two populations, identified early in the assignment step, are in slow interconversion on the NMR timescale. The two conformers were shown to originate from a cis/trans peptidyl-prolyl isomerization. Using a distance geometry program and simulated annealing protocol under the NMR restraints we obtained 10 final structures for the major conformation (trans isomer). None of the structures showed NOE violations larger than 0.05 nm, and the rmsd value relative to the mean structure (considering the main chain atoms in well-defined secondary structure) is 0.07 nm. The three-dimensional structure contains a short alpha-helix strapped on a small antiparallel beta-strand and an N-terminal extended fragment. The sequence/structure and structure/function relationships of the new scorpion toxin-like peptide are discussed in the context of the present structure determination. This toxin shows a stable, highly populated cis conformer of a peptidyl-prolyl peptide bond.
E Adjadj; V Naudat; E Quiniou; D Wouters; P Sautière; C T Craescu
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  European journal of biochemistry / FEBS     Volume:  246     ISSN:  0014-2956     ISO Abbreviation:  Eur. J. Biochem.     Publication Date:  1997 May 
Date Detail:
Created Date:  1997-08-04     Completed Date:  1997-08-04     Revised Date:  2007-07-23    
Medline Journal Info:
Nlm Unique ID:  0107600     Medline TA:  Eur J Biochem     Country:  GERMANY    
Other Details:
Languages:  eng     Pagination:  218-27     Citation Subset:  IM    
Institut National de la Santé et de la Recherche Médicale U350 and Institut Curie, Orsay, France.
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MeSH Terms
Amino Acid Sequence
Insect Proteins
Magnetic Resonance Spectroscopy
Models, Molecular
Molecular Sequence Data
Proline / chemistry
Protein Conformation*
Protein Structure, Secondary
Protein Structure, Tertiary
Scorpion Venoms / chemistry*,  isolation & purification
Sequence Homology, Amino Acid
Structure-Activity Relationship
Reg. No./Substance:
0/Chlorotoxin; 0/Insect Proteins; 0/Lqh 8-6 protein, Leiurus quinquestriatus hebraeus; 0/Neurotoxins; 0/Scorpion Venoms; 147-85-3/Proline

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