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1XGB

ALPHA CONOTOXIN GI: 2-13;3-7 DISULFIDE BOND ISOMER NMR, 24 STRUCTURES

Summary for 1XGB
Entry DOI10.2210/pdb1xgb/pdb
DescriptorALPHA-CONOTOXIN GI (1 entity in total)
Functional Keywordsalpha-conotoxin, nicotinic acetylcholine receptor, disulfide bond isomers, toxin
Cellular locationSecreted: P01519
Total number of polymer chains1
Total formula weight1442.65
Authors
Gehrmann, J.,Alewood, P.F.,Craik, D.J. (deposition date: 1998-01-18, release date: 1999-02-16, Last modification date: 2024-11-06)
Primary citationGehrmann, J.,Alewood, P.F.,Craik, D.J.
Structure determination of the three disulfide bond isomers of alpha-conotoxin GI: a model for the role of disulfide bonds in structural stability.
J.Mol.Biol., 278:401-415, 1998
Cited by
PubMed Abstract: The three possible disulfide bonded isomers of alpha-conotoxin GI have been selectively synthesised and their structures determined by 1H NMR spectroscopy. alpha-Conotoxin GI derives from the venom of Conus geographus and is a useful neuropharmacological tool as it selectively binds to the nicotinic acetylcholine receptor (nAChR), a ligand-gated ion channel involved in nerve signal transmission. The peptide has the sequence ECCNPACGRHYSC-NH2, and the three disulfide bonded isomers are referred to as GI(2-7;3-13), GI(2-13;3-7) and GI(2-3;7-13). The NMR structure for the native isomer GI(2-7;3-13) is of excellent quality, with a backbone pairwise RMSD of 0.16 A for a family of 35 structures, and comprises primarily a distorted 310 helix between residues 5 to 11. The two non-native isomers exhibit multiple conformers in solution, with the major populated forms being different in structure both from each other and from the native form. Structure-activity relationships for the native GI(2-7;3-13) as well as the role of the disulfide bonds on folding and stability of the three isomers are examined. It is concluded that the disulfide bonds in alpha-conotoxin GI play a crucial part in determining both the structure and stability of the peptide. A trend for increased conformational heterogeneity was observed in the order of GI(2-7;3-13)PubMed: 9571060
DOI: 10.1006/jmbi.1998.1701
PDB entries with the same primary citation
Experimental method
SOLUTION NMR
Structure validation

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