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• W2075532773 abstract "Botulinum neurotoxins are responsible for botulism, a flaccid muscular paralysis caused by inhibition of acetylcholine release at the neuromuscular junction. This occurs by cleavage of conserved proteins involved in exocytosis such as synaptobrevin by the zinc metallopeptidase activity of the light chain of some botulinum neurotoxins. Botulism, for which there is presently no therapy available, is a relatively widespread disease that may result in death. Consequently, the development of drugs able to inhibit the hydrolytic activity of these neurotoxins is of great interest. Design and screening of such inhibitors could be largely facilitated by using high-throughput assays. With this aim, a novel in vitro test for quantifying the proteolytic activity of botulinum type B neurotoxin was developed. The substrate is the 60--94 fragment of human synaptobrevin-1 which was modified by introduction of the fluorescent amino acid l-pyrenylalanine in position 74 and a p-nitrophenylalanyl residue as quenching group in position 77. The cleavage of Syb 60-94 [Pya(74), Nop(77)] by the toxin active chain occurs selectively between residues 76 and 77 as in the case of the unmodified synaptobrevin and is directly quantified by measuring the strong fluorescence of the formed metabolite Syb 60-76 [Pya(74)]. This is the easiest, quickest, and cheapest assay described to date for measuring the proteolytic activity of botulinum type B neurotoxin. It can be easily automated for high-throughput screening. Moreover, amounts of about 3.5 pg/ml of botulinum type B neurotoxin could be detected by this method." @default.
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• W2075532773 date "2001-04-01" @default.
• W2075532773 modified "2023-10-16" @default.
• W2075532773 title "High-Throughput Fluorogenic Assay for Determination of Botulinum Type B Neurotoxin Protease Activity" @default.
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• W2075532773 doi "https://doi.org/10.1006/abio.2001.5028" @default.
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