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• W1485762016 abstract "Tetanus toxin and the seven serologically distinct botulinal neurotoxins (BoNT/A to BoNT/G) abrogate synaptic transmission at nerve endings through the action of their light chains (L chains), which proteolytically cleave VAMP (vesicle-associated membrane protein)/synaptobrevin, SNAP-25 (synaptosome-associated protein of 25 kDa), or syntaxin. BoNT/C was reported to proteolyze both syntaxin and SNAP-25. Here, we demonstrate that cleavage of SNAP-25 occurs between Arg198 and Ala199, depends on the presence of regions Asn93 to Glu145 and Ile156 to Met202, and requires about 1,000-fold higher L chain concentrations in comparison with BoNT/A and BoNT/E. Analyses of the BoNT/A and BoNT/E cleavage sites revealed that changes in the carboxyl-terminal residues, in contrast with changes in the amino-terminal residues, drastically impair proteolysis. A proteolytically inactive BoNT/A L chain mutant failed to bind to VAMP/synaptobrevin and syntaxin, but formed a stable complex (KD = 1.9 x 10(-7) M) with SNAP-25. The minimal essential domain of SNAP-25 required for cleavage by BoNT/A involves the segment Met146-Gln197, and binding was optimal only with full-length SNAP-25. Proteolysis by BoNT/E required the presence of the domain Ile156-Asp186. Murine SNAP-23 was cleaved by BoNT/E and, to a reduced extent, by BoNT/A, whereas human SNAP-23 was resistant to all clostridial L chains. Lys185Asp or Pro182Arg mutations of human SNAP-23 induced susceptibility toward BoNT/E or toward both BoNT/A and BoNT/E, respectively." @default.
• W1485762016 created "2016-06-24" @default.
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• W1485762016 date "1999-01-01" @default.
• W1485762016 modified "2023-09-26" @default.
• W1485762016 title "Proteolysis of SNAP-25 Isoforms by Botulinum Neurotoxin Types A, C, and E" @default.
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• W1485762016 doi "https://doi.org/10.1046/j.1471-4159.1999.0720327.x" @default.
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