Conotoxins (or conopeptides) are the peptidic components of the venoms of marine cone snails (genus Conus). They are classified in one of three ways: gene superfamily, cysteine framework or pharmacological family. Several distinct cysteine frameworks have been described in conotoxins. Members of this family display a XI cysteine pattern (C-C-CC-CC-C-C) and belong to the I2- superfamily conotoxins. Family members such as Kappa-conotoxin ViTx Swiss:Q7YZS9 and Kappa-conotoxin SrXIA Swiss:P0C615 inhibit voltage gated potassium channels (Kv) [1].

1: Conotoxin gene superfamilies. Robinson SD, Norton RS; Mar Drugs. 2014;12:6058-6101. PMID:25522317