1CNL

ALPHA-CONOTOXIN IMI

1CNL の概要

• エントリーDOI: 10.2210/pdb1cnl/pdb
• NMR情報: BMRB: 4399
• 分子名称: PROTEIN (ALPHA-CONOTOXIN IMI) (1 entity in total)
• 機能のキーワード: conotoxin, nicotinic acetylcholine receptor blocker, toxin
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 1356.60

構造登録者

Gehrmann, J.,Daly, N.L.,Craik, D.J. (登録日: 1999-05-20, 公開日: 1999-05-27, 最終更新日: 2024-11-20)

主引用文献

Gehrmann, J.,Daly, N.L.,Alewood, P.F.,Craik, D.J.
Solution structure of alpha-conotoxin ImI by 1H nuclear magnetic resonance.
J.Med.Chem., 42:2364-2372, 1999

PubMed Abstract: alpha-Conotoxin ImI derives from the venom of Conus imperialis and is the first and only small-peptide ligand that selectively binds to the neuronal alpha7 homopentameric subtype of the nicotinic acetylcholine receptor (nAChR). This receptor subtype is a possible drug target for several neurological disorders. The cysteines are connected in the pairs Cys2-Cys8 and Cys3-Cys12. To date it is the only alpha-conotoxin with a 4/3 residue spacing between the cysteines. The structure of ImI has been determined by 1H NMR spectroscopy in aqueous solution. The NMR structure is of high quality, with a backbone pairwise rmsd of 0.34 A for a family of 19 structures, and comprises primarily a series of nested beta turns. Addition of organic solvent does not perturb the solution structure. The first eight residues of ImI are identical to the larger, but related, conotoxin EpI and adopt a similar structure, despite a truncated second loop. Residues important for binding of ImI to the alpha7 nAChR are all clustered on one face of the molecule. Once further binding data for EpI and ImI are available, the ImI structure will allow for design of novel alpha7 nAChR-specific agonists and antagonists with a wide range of potential pharmaceutical applications.

PubMed: 10395477
DOI: 10.1021/jm990114p

実験手法

SOLUTION NMR