N-Biotinyl p-aminophenyl arsenic acid is a bifunctional reagent that can bind to both streptavidin and dithiols. N-Biotinyl p-aminophenyl arsenic acid decreases the Rbungarotoxin-binding sites in reduced Torpedo nicotinic receptors (IC50 is 10-300 nM), and protects the receptor from irreversible alkylation by bromoacetylcholine.
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