Solution structure of alpha-conotoxin SI

Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 36 
  • Selection Criteria: LOWEST ENERGY STRUCTURES 

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This is version 1.4 of the entry. See complete history


Solution Structure of Alpha-Conotoxin Si

Benie, A.J.Whitford, D.Hargittai, B.Barany, G.Janes, R.W.

(2000) FEBS Lett 476: 287

  • DOI: https://doi.org/10.1016/s0014-5793(00)01724-5
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The nuclear magnetic resonance solution structure of alpha-conotoxin SI has been determined at pH 4.2. The 36 lowest energy structures show that alpha-conotoxin SI exists in a single major solution conformation and is stabilized by six hydrogen bonds. Comparisons are made between the SI solution structure and the solution and crystal structures of alpha-conotoxin GI. Surprisingly, a high degree of similarity between the backbone conformations of the GI crystal and the SI solution structures is seen in the region of lowest sequence homology, namely residues Gly-8 to Ser-12. This similarity is more surprising when considering that in SI a proline replaces the Arg-9 found in GI. The correspondence in conformation in this region provides the definitive evidence that it is the loss of the arginine basic charge at residue 9 which determines the differences in toxicity between GI and SI, rather than any changes in conformation induced by the cyclic proline residue.

  • Organizational Affiliation

    Molecular and Cellular Biology, St. Bartholomew's and the Royal London School of Medicine and Dentistry, University of London, UK.


Find similar proteins by:  Sequence   |   3D Structure  

Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
ALPHA-CONOTOXIN SI14Conus striatusMutation(s): 0 
Membrane Entity: Yes 
Find proteins for P15471 (Conus striatus)
Explore P15471 
Go to UniProtKB:  P15471
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP15471
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 36 
  • Selection Criteria: LOWEST ENERGY STRUCTURES 

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2000-08-25
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2020-01-15
    Changes: Derived calculations, Other
  • Version 1.4: 2023-06-14
    Changes: Database references, Other