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  • Title: Partial amino acid sequences of botulinum neurotoxins types B and E.
    Author: Schmidt JJ, Sathyamoorthy V, DasGupta BR.
    Journal: Arch Biochem Biophys; 1985 May 01; 238(2):544-8. PubMed ID: 3888113.
    Abstract:
    Clostridium botulinum type E neurotoxin, a single-chain protein of Mr 147,000, was purified and subjected to amino acid sequencing. The same was done for single-chain botulinum type B neurotoxin (Mr 152,000), and for the heavy and light chains (Mr 104,000 and 51,000 respectively) derived from type B by limited trypsin digestion. Twelve to eighteen residues were identified and the following conclusions were drawn: The light chain of the nicked (dichain) type B is derived from the N-terminal one-third of the single-chain (unnicked) parent neurotoxin; sequence homologies are present between single-chain types B and E and the light chain of the nicked type A [J. J. Schmidt, V. Sathyamoorthy, and B. R. DasGupta (1984) Biochem. Biophys. Res. Commun. 119, 900-904]; the N-terminal regions of the heavy chains of types A and B have some structural similarity; and activation of type B neurotoxin cannot involve removal of amino acids or peptides from the N terminus.
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