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8.B.1.1.13
Scorpion toxin, Cn12 of 67 aas and four disulfide bridges. he NMR structure has been determined.  It has a beta-toxin sequence but alpha-like physiological activity (del Río-Portilla et al. 2004). It binds voltage-independently at site-3 of sodium channels (Nav) to inhibit the inactivation of the activated channels, thereby blocking neuronal transmission.

Accession Number:P63019
Protein Name:Alpha-toxin Cn12
Length:67
Molecular Weight:7148.00
Species:Centruroides noxius (Mexican scorpion) [6878]
Location1 / Topology2 / Orientation3: Secreted1
Substrate

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Structure:
1PE4     

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FASTA formatted sequence
1:	RDGYPLASNG CKFGCSGLGE NNPTCNHVCE KKAGSDYGYC YAWTCYCEHV AEGTVLWGDS 
61:	GTGPCRS