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UMR 7286 - Centre de Recherche en Neurobiologie et Neurophysiologie de Marseille

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Accueil > Bibliographie > A substrate sensor chip to assay the enzymatic activity of Botulinum (...)

A substrate sensor chip to assay the enzymatic activity (...)

Biosens Bioelectron. 2013 Nov ;49:276-81
A substrate sensor chip to assay the enzymatic activity of Botulinum neurotoxin A.
Leveque C, Ferracci G, Maulet Y, Grand-Masson C, Blanchard MP, Seagar M, El Far O.

Botulinum neurotoxin A (BoNT/A) induces muscle paralysis by enzymatically cleaving the presynaptic SNARE protein SNAP-25, which results in lasting inhibition of acetylcholine release at the neuromuscular junction. A rapid and sensitive in vitro assay for BoNT/A is required to replace the mouse lethality assay (LD50) in current use. We have developed a fully automated sensor to assay the endoprotease activity of BoNT/A. We produced monoclonal antibodies (mAbs) that recognize SNAP-25 neo-epitopes specifically generated by BoNT/A action. Recombinant SNAP-25 was coupled to the sensor surface of a surface plasmon resonance (SPR) system and samples containing BoNT/A were injected over the substrate sensor. Online substrate cleavage was monitored by measuring binding of mAb10F12 to a SNAP-25 neo-epitope. The SNAP-25-chip assay was toxin serotype-specific and detected 55fM BoNT/A (1 LD50/ml) in 5min and 0.4fM (0.01 LD50/ml) in 5h. Time-course and dose-response curves were linear, yielding a limit of quantification of 0.03 LD50/ml. This label-free method is 100 times more sensitive than the mouse assay, potentially providing rapid read-out of small amounts of toxin for environmental surveillance and the quality control of pharmaceutical preparations.


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