Three-finger toxin 3b

UniProtKB accession:  U3EPL2

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UniProtKB description:  Postsynaptic neurotoxin that produces potent, and completely reversible, postsynaptic neuromuscular blockade, as well as broad spectrum inhibition of human muscle and neuronal nicotinic acetylcholine receptors (nAChRs). Inhibition is potent or moderate, depending on the receptor (alpha-1-beta-1-delta-epsilon/CHRNA1-CHRNB1-CHRND-CHRNE (IC(50)=2.56 uM), alpha-4-beta-2/CHRNA4-CHRNB2 (IC(50)=1.8 uM), alpha-7/CHRNA7 (IC(50)=7 uM), and alpha-3-beta-2/CHRNA3-CHRNB2 (IC(50)=12.6 uM)). Acts as a competitive antagonist of ACh. Binds to chicken muscle-type nicotinic acetylcholine receptor (AChR) with high potency compared with the cloned human receptor. Unlike short-chain alpha-3FTxs that only bind to muscle nAChRs, this toxin utilizes dimerization to expand its pharmacological targets to block neuronal nAChRs.