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A New α-Conotoxin Which Targets α3β2 Nicotinic Acetylcholine Receptors
Open accessAbstract
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.
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Citations
Cited by
Neuronal nicotinic receptors: from structure to pathology
Gotti, C., & Clementi, F. (2004) · Progress in Neurobiology · doi:10.1016/j.pneurobio.2004.09.006 · Cited by 970
Brain nicotinic acetylcholine receptors: native subtypes and their relevance
Gotti, C., Zoli, M., & Clementi, F. (2006) · Trends in Pharmacological Sciences · doi:10.1016/j.tips.2006.07.004 · Cited by 882
Klink, R., d'Exaerde, A. D. K., Zoli, M., & Changeux, J.-P. (2001) · The Journal of Neuroscience · doi:10.1523/jneurosci.21-05-01452.2001 · Cited by 674
Competition in Retinogeniculate Patterning Driven by Spontaneous Activity
Penn, A. A., Riquelme, P. A., Feller, M. B., & Shatz, C. J. (1998) · Science · doi:10.1126/science.279.5359.2108 · Cited by 514
Neuronal Nicotinic Acetylcholine Receptors as Targets for Drug Discovery
Holladay, M. W., Dart, M. J., & Lynch, J. K. (1997) · Journal of Medicinal Chemistry · doi:10.1021/jm970377o · Cited by 444
Metadata
- Authors
- Cartier, G. E., Yoshikami, D., Gray, W. R., Luo, S., Olivera, B. M., & McIntosh, J. M.
- Venue
- Journal of Biological Chemistry
- Publisher
- Elsevier BV
- Published
- 1996-03
- Volume
- 271
- Issue
- 13
- Pages
- 7522-7528
- ISSN
- 0021-9258 (ISSN-L)
- OpenAlex
- W1560891849
- Cited by
- 489
- References
- 0
- FWCI
- 6.80
- Type
- journal article
- Language
- en
- Open access
- hybrid
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- Cartier, G. E., Yoshikami, D., Gray, W. R., Luo, S., Olivera, B. M., & McIntosh, J. M. (1996). A New α-Conotoxin Which Targets α3β2 Nicotinic Acetylcholine Receptors. Journal of Biological Chemistry. https://doi.org/10.1074/jbc.271.13.7522
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