Association of botulinum neurotoxin serotypes A and B with synaptic vesicle protein complexes
Biochemistry, ISSN: 0006-2960, Vol: 46, Issue: 11, Page: 3200-3210
2007
- 53Citations
- 36Captures
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Metrics Details
- Citations53
- Citation Indexes53
- 53
- CrossRef51
- Captures36
- Readers36
- 36
Article Description
Botulinum neurotoxins (BoNTs) elicit flaccid paralysis through cleavage of SNARE proteins within peripheral neurons. There are seven serotypes of the BoNTs, termed A-G, which differ in the SNARE protein and/or site that is cleaved. BoNTs are single-chain toxins that comprise an N-terminal zinc metalloprotease domain that is disulfide linked to the C-terminal translocation/receptor binding domain. SV2 and synaptotagmin have been identified as receptors for BoNT serotypes A and B, respectively. Using affinity chromatography, BoNTs A and B were observed to bind synaptic vesicle protein complexes in synaptosome lysates. Tandem LC-MS/MS identified SV2, synaptotagmin I, synaptophysin, vesicle-associated membrane protein 2 (VAMP2), and the vacuolar proton pump as components of the BoNT-receptor complex. Density gradient analysis showed that BoNT serotypes A and B exhibited unique interactions with the synaptic vesicle protein complexes. The association of BoNT serotypes A and B with synaptic vesicle protein complexes implicates a physiological role for protein complexes in synaptic vesicle biology and provides insight into the interactions of BoNT and neuronal receptors. © 2007 American Chemical Society.
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