1IMI

SOLUTION STRUCTURE OF ALPHA-CONOTOXIN IM1


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 20 
  • Selection Criteria: BEST 20 OUT OF 83 WITH PA BACKBONE RMSD NOT LESS THAN 0.05 A 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

NMR spatial structure of alpha-conotoxin ImI reveals a common scaffold in snail and snake toxins recognizing neuronal nicotinic acetylcholine receptors.

Maslennikov, I.V.Shenkarev, Z.O.Zhmak, M.N.Ivanov, V.T.Methfessel, C.Tsetlin, V.I.Arseniev, A.S.

(1999) FEBS Lett 444: 275-280

  • DOI: 10.1016/s0014-5793(99)00069-1
  • Primary Citation of Related Structures:  
    1IMI

  • PubMed Abstract: 
  • A 600 MHz NMR study of alpha-conotoxin ImI from Conus imperialis, targeting the alpha7 neuronal nicotinic acetylcholine receptor (nAChR), is presented. ImI backbone spatial structure is well defined basing on the NOEs, spin-spin coupling constants, and amide protons hydrogen-deuterium exchange data: rmsd of the backbone atom coordinates at the 2-12 region is 0 ...

    A 600 MHz NMR study of alpha-conotoxin ImI from Conus imperialis, targeting the alpha7 neuronal nicotinic acetylcholine receptor (nAChR), is presented. ImI backbone spatial structure is well defined basing on the NOEs, spin-spin coupling constants, and amide protons hydrogen-deuterium exchange data: rmsd of the backbone atom coordinates at the 2-12 region is 0.28 A in the 20 best structures. The structure is described as a type I beta-turn (positions 2-5) followed by a distorted helix (positions 5-11). Similar structural patterns can be found in all neuronal-specific alpha-conotoxins. Highly mobile side chains of the Asp-5, Arg-7 and Trp-10 residues form a single site for ImI binding to the alpha7 receptor. When depicted with opposite directions of the polypeptide chains, the ImI helix and the tip of the central loop of long chain snake neurotoxins demonstrate a common scaffold and similar positioning of the functional side chains, both of these structural elements appearing essential for binding to the neuronal nAChRs.


    Related Citations: 
    • A Nicotinic Acetylcholine Receptor Ligand of Unique Specificity, Alpha- Conotoxin ImI
      McIntosh, J.M., Yoshikami, D., Mahe, E., Nielsen, D.B., Rivier, J.E., Gray, W.R., Olivera, B.M.
      (1994) J Biol Chem 269: 1673

    Organizational Affiliation

    Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Science, Moscow.



Macromolecules
  • Find similar proteins by:  Sequence   |   Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
PROTEIN (ALPHA-CONOTOXIN IMI)A13Conus imperialisMutation(s): 0 
UniProt
Find proteins for P50983 (Conus imperialis)
Explore P50983 
Go to UniProtKB:  P50983
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 20 
  • Selection Criteria: BEST 20 OUT OF 83 WITH PA BACKBONE RMSD NOT LESS THAN 0.05 A 
  • OLDERADO: 1IMI Olderado

Structure Validation

View Full Validation Report




Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1999-04-23
    Type: Initial release
  • Version 1.1: 2008-04-26
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance