1M2C
THREE-DIMENSIONAL STRUCTURE OF ALPHA-CONOTOXIN MII, NMR, 14 STRUCTURES
Summary for 1M2C
| Entry DOI | 10.2210/pdb1m2c/pdb |
| Descriptor | ALPHA-CONOTOXIN MII (1 entity in total) |
| Functional Keywords | neurotoxin, neuronal nicotinic acetylcholine receptor inhibitor, subtype specific ligand, presynaptic nicotinic acetylcholine receptor blocker, cholinergic modulation, dopamine release |
| Biological source | Conus magus (magus cone) |
| Cellular location | Secreted: P56636 |
| Total number of polymer chains | 1 |
| Total formula weight | 1715.98 |
| Authors | Shon, K.J.,Koerber, S.C.,Rivier, J.E.,Olivera, B.M.,Mcintosh, J.M. (deposition date: 1997-09-15, release date: 1998-12-09, Last modification date: 2024-10-30) |
| Primary citation | Cartier, G.E.,Yoshikami, D.,Gray, W.R.,Luo, S.,Olivera, B.M.,McIntosh, J.M. A new alpha-conotoxin which targets alpha3beta2 nicotinic acetylcholine receptors. J.Biol.Chem., 271:7522-7528, 1996 Cited by PubMed Abstract: We have isolated a 16-amino acid peptide from the venom of the marine snail Conus magus which potently blocks nicotinic acetylcholine receptors (nAChRs) composed of alpha3beta2 subunits. This peptide, named alpha-conotoxin MII, was identified by electrophysiologically screening venom fractions against cloned nicotinic receptors expressed in Xenopus oocytes. The peptide's structure, which has been confirmed by mass spectrometry and total chemical synthesis, differs significantly from those of all previously isolated alpha-conotoxins. Disulfide bridging, however, is conserved. The toxin blocks the response to acetylcholine in oocytes expressing alpha3beta2 nAChRs with an IC50 of 0.5 nM and is 2-4 orders of magnitude less potent on other nAChR subunit combinations. We have recently reported the isolation and characterization of alpha-conotoxin ImI, which selectively targets homomeric alpha7 neuronal nAChRs. Yet other alpha-conotoxins selectively block the muscle subtype of nAChR. Thus, it is increasingly apparent that alpha-conotoxins represent a significant resource for ligands with which to probe structure-function relationships of various nAChR subtypes. PubMed: 8631783DOI: 10.1074/jbc.271.13.7522 PDB entries with the same primary citation |
| Experimental method | SOLUTION NMR |
Structure validation
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