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JBC, Vol. 254, Issue 13, 5827-5831, Jul, 1979

The amino acid sequence of fragment A, an enzymically active fragment of diphtheria toxin. I. The tryptic peptides from the maleylated protein

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

Six tryptic peptides ranging in size from 3 to 126 residues were isolated from maleylated Fragment A of diphtheria toxin after tryptic hydrolysis. These peptides accounted for all 193 residues found by amino acid analysis. After demaleylation, the six peptides were purified by chromatography on Sephadex G-50, coupled with paper chromatography and electrophoresis, and were analyzed by various methods. The compositions and properties of the peptides are reported. Almost 70% of the residues were positioned within these peptides.
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