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Toxin III, the smallest toxin component of the poison of the sea anemone Anemonia sulcata, is a polypeptide with 27 amino acids. Its structure is stabilized by three disulfide bridges. The amino acid sequence was determined by solid-phase Edman degradation of the aminoethylated derivative. The peptide was coupled to the carrier, porous glass, by thiourea bridges between the alpha-amino group of arginine-1 and the epsilon-amino group of lysine-26 and the isothiocyanate groups of the carrier. Another fraction of the polypeptide was bound by an acid-amide condensation of the C-terminal valine-27 with the aminopropyl group of the carrier. The sequence of toxin III has no regions homologous to the 47-residue toxin II. Comparison with the known partial sequence of toxin I, which contains 46 amino acids (Wunderer, G. &amp; Eulitz, M., in preparation) also fails to reveal homologies.

Amino Acid Sequence of Toxin III from Anemonia sulcata