The complete primary structure of toxin CM-1b from Hemachatus haemachatus (Ringhals) snake venom

Abstract

Toxin CM-1b was purified from Hemachatus haemachatus venom. The purified toxin contains 57 amino acids including 8 half-cystine residues in a single polypeptide chain. The complete primary structure of CM-1b has been established. The sequence and the invariant amino acid residues of CM-1b resemble those of the Naja-type toxins. In toxin CM-1b one of the structurally invariant amino acid residues proline 48, of the short neurotoxins has been replaced by a arginine, while it contains none of the functionally invariant amino acid residues.