Solution structure of the sodium channel antagonist conotoxin GS: a new molecular caliper for probing sodium channel geometry.
Hill, J.M., Alewood, P.F., Craik, D.J.(1997) Structure 5: 571-583
- PubMed: 9115446 
- DOI: https://doi.org/10.1016/s0969-2126(97)00212-8
- Primary Citation of Related Structures:  
1AG7 - PubMed Abstract: 
The venoms of Conus snails contain small, disulfide-rich inhibitors of voltage-dependent sodium channels. Conotoxin GS is a 34-residue polypeptide isolated from Conus geographus that interacts with the extracellular entrance of skeletal muscle sodium channels to prevent sodium ion conduction. Although conotoxin GS binds competitively with mu conotoxin GIIIA to the sodium channel surface, the two toxin types have little sequence identity with one another, and conotoxin GS has a four-loop structural framework rather than the characteristic three-loop mu-conotoxin framework. The structural study of conotoxin GS will form the basis for establishing a structure-activity relationship and understanding its interaction with the pore region of sodium channels.
Organizational Affiliation: 
Centre for Drug Design and Development The University of Queensland, Brisbane, Queensland, 4072, Australia.