ISDA

Deposition Date 2006-03-15

Release Date 2006-07-25

Last Version Date 2024-11-20

Entry Detail

PDB ID:

2GCZ

Keywords:

TOXIN

Title:

Solution Structure of alpha-Conotoxin OmIA

Biological Source:

Source Organism:

Conus omaria (Taxon ID: 89429)

Method Details:

Experimental Method:

SOLUTION NMR

Conformers Calculated:

Conformers Submitted:

Selection Criteria:

structures with the lowest energy

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Macromolecular Entities

Protein Blast

Polymer Type:polypeptide(L)
Molecule:Alpha-conotoxin OmIA
Chain IDs:A
Chain Length:18
Number of Molecules:1
Biological Source:Conus omaria

UniProt ID:P0C1R7 Pfam ID:PF07365

Ligand Molecules

Primary Citation

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.Show

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

PMID: 16678128 DOI: 10.1016/j.bbrc.2006.04.099

Abstact

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.

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Protein

Chemical

Disease

Primary Citation of related structures