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

  • Also Cited By: 2MOA

  • 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, a ...

    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 LengthOrganismDetails
PROTEIN (ALPHA-CONOTOXIN IMI)
A
13Conus imperialisN/A
Find proteins for P50983 (Conus imperialis)
Go to UniProtKB:  P50983
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
NH2
Query on NH2
A
NON-POLYMERH2 N

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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 or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

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