Scorpion toxin

It has an irregular fold, with its 2 beta-strands and 1 alpha-helix held in place by 4 disulfide bonds.

The beta-strands are colored gold, the alpha-helix is cyan, and the sulfurs of the cysteines are colored red.

Polikarpov, I., Sanches Jr., M. S., Marangoni, S., Toyama, M. H., Teplyakov, A.: Crystal Structure of Neurotoxin Ts1 from Tityus Serrulatus Provides Insights Into the Specificity and Toxicity of Scorpion Toxins

J.Mol.Biol. 290 pp. 175 (1999)(PubMed)

1b7d (PDB)