Abstract
Tetanus and botulism neurotoxins (TeNT and BoNT, respectively) produced by Clostridia are the most toxic substances known: the mouse LD50 of highly purified preparations is between 0.1 and 1 ng/kg. They block the release of neuro- transmitters either at the peripheral (BoNT) or central (TeNT) nervous system. This tremendous potency derives from two essential features of these bacterial toxins: (a) their absolute neurospecificity and (b) their intracellular catalytic activity. By concentrating their action on a limited number of cells, whose complete functionality is essential to the survival of very complex animals such as the vertebrates, neurotoxins lead to animal death with a minimal amount of toxic molecules. The basis of this cell selectivity resides on receptors uniquely present on neuronal cells (see Halpern and Neale, this volume). Although questioned by a number of researchers, it was not unexpected that clostridial neurotoxins are enzymes, acting in the neuron cytosol (Schiavo et al. 1993a). In fact, an enzyme can modify one after another all the target molecules present in the system and hence one single molecule of an enzymic toxin is able to intoxicate a synapse. TeNT and the seven BoNTs, A-G, are zinc endopeptidases specific for protein components of the neuroexocytosis apparatus. This enzymatic activity is the subject of this chapter.
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Schiavo, G., Rossetto, O., Tonello, F., Montecucco, C. (1995). Intracellular Targets and Metalloprotease Activity of Tetanus and Botulism Neurotoxins. In: Montecucco, C. (eds) Clostridial Neurotoxins. Current Topics in Microbiology and Immunology, vol 195. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-85173-5_12
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