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JBC, Vol. 254, Issue 13, 5832-5837, Jul, 1979

The amino acid sequence of fragment A, an enzymically active fragment of diphtheria toxin. II. The cyanogen bromide peptides

R. E. Drazin, R. J. Collier, L. C. Williams and R. J. DeLange

Cyanogen bromide cleavage of Fragment A from diphtheria toxin at the four methionines present in each molecule resulted in five major peptides which were isolated and studied by sequence methods. These five peptides of 4, 11, 14, 63, and 101 residues account for all 193 residues in Fragment A and provide overlaps for the tryptic peptides from the maleylated protein. Two additional peptides were isolated and shown to be shorter forms (8 and 10 residues) of the COOH-terminal cyanogen bromide peptide (11 residues).
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