Botulinum neurotoxin type A - A5HZZ9 (BXA1_CLOBH)

 

Protein Feature View of PDB entries mapped to a UniProtKB sequence  

  • Number of PDB entries for A5HZZ9: 14
 
Function
Inhibits acetylcholine release. The botulinum toxin binds with high affinity to peripheral neuronal presynaptic membrane to the secretory vesicle protein SV2. It binds directly to the largest luminal loop of SV2A, SV2B and SV2C. It is then internalized by receptor-mediated endocytosis. The C-terminus of the heavy chain (H) is responsible for the adherence of the toxin to the cell surface while the N-terminus mediates transport of the light chain from the endocytic vesicle to the cytosol. After translocation, the light chain (L) hydrolyzes the 197-Gln-|-Arg-198 bond in SNAP-25, thereby blocking neurotransmitter release. Inhibition of acetylcholine release results in flaccid paralysis, with frequent heart or respiratory failure. (data source: UniProt  )
Catalytic Activity

Limited hydrolysis of proteins of the neuroexocytosis apparatus, synaptobrevins, SNAP25 or syntaxin. No detected action on small molecule substrates.

(data source: UniProt  )
Subunit structure
Disulfide-linked heterodimer of a light chain (L) and a heavy chain (H). (data source: UniProt  )
UniProtKB:
Length:
Other Gene names: botA CBO0806 CLC_0862
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The PDB to UniProt mapping is based on the data provided by the EBI SIFTS project. See also Velankar et al., Nucleic Acids Research 33, D262-265 (2005).
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