2GCZ

Solution Structure of alpha-Conotoxin OmIA


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 20 
  • 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

Solution conformation of a neuronal nicotinic acetylcholine receptor antagonist alpha-conotoxin OmIA that discriminates alpha3 vs. alpha6 nAChR subtypes

Chi, S.-W.Kim, D.-H.Olivera, B.M.McIntosh, J.M.Han, K.-H.

(2006) Biochem.Biophys.Res.Commun. 345: 248-254

  • DOI: 10.1016/j.bbrc.2006.04.099

  • PubMed Abstract: 
  • alpha-Conotoxin OmIA from Conus omaria is the only alpha-conotoxin that shows a approximately 20-fold higher affinity to the alpha3beta2 over the alpha6beta2 subtype of nicotinic acetylcholine receptor. We have determined a three-dimensional structur ...

    alpha-Conotoxin OmIA from Conus omaria is the only alpha-conotoxin that shows a approximately 20-fold higher affinity to the alpha3beta2 over the alpha6beta2 subtype of nicotinic acetylcholine receptor. We have determined a three-dimensional structure of alpha-conotoxin OmIA by nuclear magnetic resonance spectroscopy. alpha-Conotoxin OmIA has an "omega-shaped" overall topology with His(5)-Asn(12) forming an alpha-helix. Structural features of alpha-conotoxin OmIA responsible for its selectivity are suggested by comparing its surface characteristics with other functionally related alpha4/7 subfamily conotoxins. Reduced size of the hydrophilic area in alpha-conotoxin OmIA seems to be associated with the reduced affinity towards the alpha6beta2 nAChR subtype.


    Organizational Affiliation

    Molecular Anti-Cancer Research Center, Division of Molecular Therapeutics, Korea Research Institute of Bioscience and Biotechnology, Yusong P.O. Box 115, Daejon, Republic of Korea.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
alpha-conotoxin OmIA
A
18Conus omariaN/A
Find proteins for P0C1R7 (Conus omaria)
Go to UniProtKB:  P0C1R7
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: 50 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 
  • Olderado: 2GCZ Olderado

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2006-07-25
    Type: Initial release
  • Version 1.1: 2008-05-01
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance