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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.
G E Cartier, and
D Yoshikami, and
W R Gray, and
S Luo, and
B M Olivera, and
J M McIntosh
June 2004,
The Biochemical journal,
G E Cartier, and
D Yoshikami, and
W R Gray, and
S Luo, and
B M Olivera, and
J M McIntosh
May 2005,
Biochemistry,
G E Cartier, and
D Yoshikami, and
W R Gray, and
S Luo, and
B M Olivera, and
J M McIntosh
February 1997,
Molecular pharmacology,
G E Cartier, and
D Yoshikami, and
W R Gray, and
S Luo, and
B M Olivera, and
J M McIntosh
August 2006,
The Journal of biological chemistry,
G E Cartier, and
D Yoshikami, and
W R Gray, and
S Luo, and
B M Olivera, and
J M McIntosh
April 2010,
The Journal of biological chemistry,
G E Cartier, and
D Yoshikami, and
W R Gray, and
S Luo, and
B M Olivera, and
J M McIntosh
December 1997,
Biochemistry,
G E Cartier, and
D Yoshikami, and
W R Gray, and
S Luo, and
B M Olivera, and
J M McIntosh
June 1998,
The Journal of biological chemistry,
G E Cartier, and
D Yoshikami, and
W R Gray, and
S Luo, and
B M Olivera, and
J M McIntosh
January 2004,
Journal of molecular recognition : JMR,
G E Cartier, and
D Yoshikami, and
W R Gray, and
S Luo, and
B M Olivera, and
J M McIntosh
October 2009,
Journal of neurochemistry,
G E Cartier, and
D Yoshikami, and
W R Gray, and
S Luo, and
B M Olivera, and
J M McIntosh
September 2003,
The Journal of neuroscience : the official journal of the Society for Neuroscience,
