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Originally published in Science Express on 16 March 2006
Science 28 April 2006:
Vol. 312. no. 5773, pp. 592 - 596
DOI: 10.1126/science.1123654
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Reports

SV2 Is the Protein Receptor for Botulinum Neurotoxin A

Min Dong,1 Felix Yeh,1,2 William H. Tepp,3 Camin Dean,1 Eric A. Johnson,3 Roger Janz,4 Edwin R. Chapman1,2*

How the widely used botulinum neurotoxin A (BoNT/A) recognizes and enters neurons is poorly understood. We found that BoNT/A enters neurons by binding to the synaptic vesicle protein SV2 (isoforms A, B, and C). Fragments of SV2 that harbor the toxin interaction domain inhibited BoNT/A from binding to neurons. BoNT/A binding to SV2A and SV2B knockout hippocampal neurons was abolished and was restored by expressing SV2A, SV2B, or SV2C. Reduction of SV2 expression in PC12 and Neuro-2a cells also inhibited entry of BoNT/A, which could be restored by expressing SV2 isoforms. Finally, mice that lacked an SV2 isoform (SV2B) displayed reduced sensitivity to BoNT/A. Thus, SV2 acts as the protein receptor for BoNT/A.

1 Howard Hughes Medical Institute and Department of Physiology, University of Wisconsin, Madison, WI 53706, USA.
2 Molecular and Cellular Pharmacology Program, University of Wisconsin, Madison, WI 53706, USA.
3 Department of Food Microbiology and Toxicology, University of Wisconsin, Madison, WI 53706, USA.
4 W. M. Keck Center for Learning and Memory and Department of Neurobiology and Anatomy, University of Texas–Houston Medical School, Houston, TX 77030, USA.

* To whom correspondence should be addressed: E-mail: chapman{at}physiology.wisc.edu

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