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C2 toxin from Clostridium botulinum is composed of the enzyme component C2-I, which ADP-ribosylates actin, and the binding and translocation component C2-II, responsible for the interaction with eukaryotic cell receptors and the following endocytosis. Three C2-I crystal structures at resolutions of up to 1.75 Å are presented together with a crystal structure of C2-II at an appreciably lower resolution...
P2X receptors are cation channels gated by extracellular ATP and related nucleotides. Because of the widespread distribution of P2X receptors and the high subtype diversity, potent and selective antagonists are needed to dissect their roles in intact tissues. Based on suramin as a lead compound, several derivates have been described that block recombinant P2X receptors with orders of magnitude higher...
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