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Updated: Jan 16, 2026

A High-throughput-compatible FRET-based Platform for Identification and Characterization of Botulinum Neurotoxin Light Chain Modulators
Published on: December 27, 2013
Botulinum neurotoxin Light Chain/A1 uses fast synaptic vesicle cycling to cleave plasma membrane bound SNAP-25
Alexander Gardner1, Molly Sneller2, William H Tepp2
1Microbiology and Immunology, Medical College of Wisconsin, Milwaukee, 53226, USA.
Abstract:
Botulinum neurotoxins (BoNT) are the most potent protein toxins for humans, yet how BoNT-Light Chain/A1 (LC/A1) journeys to cleave intracellular SNAP-25 is understudied. Here we use a cell-based assay to measure cytosolic EGFP-LC/A1 intracellular trafficking and SNAP-25 cleavage in Neuro-2A cells. Intracellular LC/A1 associated on microtubules and co-localized with Rab GTPases involved in fast synaptic vesicles and endosome recycling. Multiple Dominant Negative (DN) Rabs GTPases involved in fast synaptic vesicles or endosome recycling inhibited LC/A1 trafficking to the intracellular plasma membrane and SNAP-25 cleavage. A cytosolic LC/A1 variant that bound the plasma membrane from the cytosol was insensitive to DNRab GTPases involved in fast synaptic vesicle recycling. LC/A1 traffics on fast synaptic vesicles to the intracellular plasma membrane to cleave SNAP-25. Our data suggest, like Heavy Chain host cell entry and LC catalysis, LC intracellular trafficking to target host substrates can contribute to bacterial toxin potency.
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