1B45

ALPHA-CNIA CONOTOXIN FROM CONUS CONSORS, NMR, 43 STRUCTURES


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 80 
  • Conformers Submitted: 43 
  • Selection Criteria: POTENTIAL ENERGIES 

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This is version 1.2 of the entry. See complete history


Literature

Biochemical characterization and nuclear magnetic resonance structure of novel alpha-conotoxins isolated from the venom of Conus consors.

Favreau, P.Krimm, I.Le Gall, F.Bobenrieth, M.J.Lamthanh, H.Bouet, F.Servent, D.Molgo, J.Menez, A.Letourneux, Y.Lancelin, J.M.

(1999) Biochemistry 38: 6317-6326

  • DOI: 10.1021/bi982817z
  • Primary Citation of Related Structures:  
    1B45

  • PubMed Abstract: 
  • Two novel alpha-conotoxins were purified and characterized from the venom of the fish-hunting cone snail Conus consors. These peptides were identified by screening HPLC fractions of the crude venom and by binding experiments with Torpedo nicotinic acetylcholine receptor ...

    Two novel alpha-conotoxins were purified and characterized from the venom of the fish-hunting cone snail Conus consors. These peptides were identified by screening HPLC fractions of the crude venom and by binding experiments with Torpedo nicotinic acetylcholine receptor. The toxins named alpha-CnIA and alpha-CnIB exhibited sequences of 14 and 12 amino acids, respectively. The alpha-CnIA represents the main alpha-conotoxin contained in the venom, whereas alpha-CnIB is present in a relatively small amount. Chemical synthesis of alpha-CnIA was carried out using the Fmoc methodology by selective disulfide bond formation. The biological activity of the toxin was assessed in fish and mice. The alpha-CnIA inhibited the fixation of iodinated alpha-bungarotoxin to Torpedo nicotinic acetylcholine receptors with an IC50 of 0.19 microM which can be compared to the IC50 of 0.31 microM found for the previously characterized alpha-MI isolated from the piscivorous Conus magus. The synthetic alpha-CnIA blocked spontaneous and evoked synaptic potentials in frog and mouse isolated neuromuscular preparations at sub-micromolar concentrations. Solution NMR of this toxin indicated a conformational heterogeneity with the existence of different conformers in solution, at slow and intermediate exchange rates relative to the NMR chemical shift time scale, similar to that reported for alpha-GI and alpha-MI. NMR structures were calculated for the major NMR signals representing more than 80% of the population at 5 degrees C.


    Organizational Affiliation

    Laboratoire de Synthèses et Etudes de Substances Naturelles à Activités Biologiques, Université de La Rochelle, Pôle Sciences, Av. Marillac, 17042 La Rochelle Cedex, France.



Macromolecules
  • Find similar proteins by:  Sequence   |   Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
ALPHA-CNIAA15Conus consorsMutation(s): 0 
Membrane Entity: Yes 
UniProt
Find proteins for P56973 (Conus consors)
Explore P56973 
Go to UniProtKB:  P56973
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 80 
  • Conformers Submitted: 43 
  • Selection Criteria: POTENTIAL ENERGIES 
  • OLDERADO: 1B45 Olderado

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1999-07-09
    Type: Initial release
  • Version 1.1: 2008-03-24
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance