1DW5

NMR STRUCTURE OF OMEGA-CONOTOXIN MVIIA: NO CONSTRAINTS ON DISULPHIDE BRIDGES


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 500 
  • Conformers Submitted: 25 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structural and dynamic characterization of omega-conotoxin MVIIA: the binding loop exhibits slow conformational exchange.

Atkinson, R.A.Kieffer, B.Dejaegere, A.Sirockin, F.Lefevre, J.F.

(2000) Biochemistry 39: 3908-3919

  • DOI: 10.1021/bi992651h
  • Primary Citation of Related Structures:  
    1DW5, 1DW4

  • PubMed Abstract: 
  • omega-Conotoxin MVIIA is a 25-residue, disulfide-bridged polypeptide from the venom of the sea snail Conus magus that binds to neuronal N-type calcium channels. It forms a compact folded structure, presenting a loop between Cys8 and Cys15 that contains a set of residues critical for its binding ...

    omega-Conotoxin MVIIA is a 25-residue, disulfide-bridged polypeptide from the venom of the sea snail Conus magus that binds to neuronal N-type calcium channels. It forms a compact folded structure, presenting a loop between Cys8 and Cys15 that contains a set of residues critical for its binding. The loop does not have a unique defined structure, nor is it intrinsically flexible. Broadening of a subset of resonances in the NMR spectrum at low temperature, anomalous temperature dependence of the chemical shifts of some resonances, and exchange contributions to J(0) from (13)C relaxation measurements reveal that conformational exchange affects the residues in this loop. The effects of this exchange on the calculated structure of omega-conotoxin MVIIA are discussed. The exchange appears to be associated with a change in the conformation of the disulfide bridge Cys8-Cys20. The implications for the use of the omega-conotoxins as a scaffold for carrying other functions is discussed.


    Organizational Affiliation

    UPR 9003 du CNRS, Ecole Supérieure de Biotechnologie de Strasbourg, Bld. Sébastien Brant, 67400 Illkirch, France. aatkins@nimr.mrc.ac.uk



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
OMEGA-CONOTOXIN MVIIAA26N/AMutation(s): 0 
Find proteins for P05484 (Conus magus)
Explore P05484 
Go to UniProtKB:  P05484
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 500 
  • Conformers Submitted: 25 
  • Selection Criteria: structures with the lowest energy 
  • OLDERADO: 1DW5 Olderado

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2000-03-01
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance