Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 55, Issue 15, Pages 4692-4696Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201600297
Keywords
analgesics; calcium channel; drug design; peptides; structure-activity relationships
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Funding
- Australian Research Council (ARC) [DP1093177]
- National Health and Medical Research Council (NHMRC) [APP1034642, APP1049928]
- University of Queensland
- ARC Future Fellowship
- ARC Australian Professorial Fellowship
- NHMRC Senior Principal Research Fellowship [APP1026501]
- NHMRC RD Wright Biomedical Research Fellowship
- Australian Research Council [DP1093177] Funding Source: Australian Research Council
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alpha-Conotoxins are disulfide-rich peptides that target nicotinic acetylcholine receptors. Recently we identified several -conotoxins that also modulate voltage-gated calcium channels by acting as G protein-coupled GABA(B) receptor (GABA(B)R) agonists. These -conotoxins are promising drug leads for the treatment of chronic pain. To elucidate the diversity of -conotoxins that act through this mechanism, we synthesized and characterized a set of peptides with homology to -conotoxins known to inhibit high voltage-activated calcium channels via GABA(B)R activation. Remarkably, all disulfide isomers of the active -conotoxins Pu1.2 and Pn1.2, and the previously studied Vc1.1 showed similar levels of biological activity. Structure determination by NMR spectroscopy helped us identify a simplified biologically active eight residue peptide motif containing a single disulfide bond that is an excellent lead molecule for developing a new generation of analgesic peptide drugs.
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