Diversity of folds in animal toxins acting on ion channels.
Animal toxins acting on ion channels of excitable cells are principally highly potent short peptides that are present in limited amounts in the venoms of various unrelated species, such as scorpions, snakes, sea anemones, spiders, insects, marine cone snails and worms. These toxins have been used extensively as invaluable biochemical and pharmacological tools to characterize and discriminate between the various ion channel types that differ in ionic selectivity, structure and/or cell function. Alongside the huge molecular and functional diversity of ion channels, a no less impressive structural diversity of animal toxins has been indicated by the discovery of an increasing number of polypeptide folds that are able to target these ion channels. Indeed, it appears that these peptide toxins have evolved over time on the basis of clearly distinct architectural motifs, in order to adapt to different ion channel modulating strategies (pore blockers compared with gating modifiers). Herein, we provide an up-to-date overview of the various types of fold from animal toxins that act on ion channels selective for K+, Na+, Ca2+ or Cl- ions, with special emphasis on disulphide bridge frameworks and structural motifs associated with these peptide folds.
Mouhat
Stéphanie
S
Laboratoire Cellpep S.A., 13-15 Rue Ledru-Rollin, 13015 Marseille, France.
Jouirou
Besma
B
Mosbah
Amor
A
De Waard
Michel
M
Sabatier
Jean-Marc
JM
D000595:Amino Acid Sequence; D000818:Animals; D002121:Calcium Channel Blockers / Q000737:chemistry / Q000494:pharmacology; D018118:Chloride Channels / Q000037:antagonists & inhibitors; D016384:Consensus Sequence; D004220:Disulfides / Q000032:analysis; D007473:Ion Channels / Q000037:antagonists & inhibitors*; D008958:Models, Molecular; D008969:Molecular Sequence Data; D026902:Potassium Channel Blockers / Q000737:chemistry / Q000494:pharmacology; D017510:Protein Folding; D026941:Sodium Channel Blockers / Q000737:chemistry / Q000494:pharmacology; D014118:Toxins, Biological / Q000737:chemistry* / Q000494:pharmacology
D002121:Calcium Channel Blockers; D018118:Chloride Channels; D004220:Disulfides; D007473:Ion Channels; D026902:Potassium Channel Blockers; D026941:Sodium Channel Blockers; D014118:Toxins, Biological