botB LC cleaves target cell VAMP2

Stable Identifier
Reaction [transition]
Homo sapiens
Related Species
Clostridium botulinum
Locations in the PathwayBrowser
SVG |   | PPTX  | SBGN
Click the image above or here to open this reaction in the Pathway Browser
The layout of this reaction may differ from that in the pathway view due to the constraints in pathway layout

Botulinum toxin type B light chain (botB LC), in the cytosol of a target cell, catalyzes the removal of an aminoterminal peptide from vesicle-associated membrane protein 2 (VAMP2). botB LC is a zinc metalloprotease (Foran et al. 1994; Schiavo et al. 1992). VAMP2 is associated with the cytosolic face of the target cell synaptic vesicle and is required for vesicle docking and exocytosis. Its cleavage by botulinum toxin blocks synaptic vesicle fusion with the plasma membrane and neurotransmitter release and in vivo leads to a long lasting flaccid paralysis (Sudhof et al, 1993; Sudhof 2004).

Literature References
PubMed ID Title Journal Year
1331807 Tetanus and botulinum-B neurotoxins block neurotransmitter release by proteolytic cleavage of synaptobrevin

Poulain, B, Polverino de Laureto, P, Schiavo, G, DasGupta, BR, Montecucco, C, Rossetto, O, Benfenati, F

Nature 1992
8402889 Membrane fusion machinery: insights from synaptic proteins

Südhof, TC, Niemann, H, Jahn, R, De Camilli, P

Cell 1993
7803399 Differences in the protease activities of tetanus and botulinum B toxins revealed by the cleavage of vesicle-associated membrane protein and various sized fragments

Shone, CC, Foran, P, Dolly, JO

Biochemistry 1994
15217342 The synaptic vesicle cycle

Südhof, TC

Annu Rev Neurosci 2004
Catalyst Activity

metalloendopeptidase activity of botB LC:Zn2+ [cytosol]

Name Identifier Synonyms
botulism DOID:11976 Botulism (disorder), Intoxication with Clostridium botulinum toxin, Botulism, Infection due to clostridium botulinum, Botulism, Foodborne botulism, botulism, Botulism, Botulism, Botulism, Food poisoning due to Clostridium botulinum, Botulism poisoning
Cite Us!