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. 1994 Aug;176(15):4766-9.
doi: 10.1128/jb.176.15.4766-4769.1994.

Identification of a single amino acid substitution in the diphtheria toxin A chain of CRM 228 responsible for the loss of enzymatic activity

V G Johnson  1 , P J Nicholls
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Identification of a single amino acid substitution in the diphtheria toxin A chain of CRM 228 responsible for the loss of enzymatic activity

V G Johnson et al. J Bacteriol. 1994 Aug.

Abstract

CRM 228 (T. Uchida, A. M. Pappenheimer, and R. Greany, J. Biol. Chem. 248:3838-3844, 1973), a mutant form of diphtheria toxin which completely lacks ADP-ribosyltransferase activity, contains five amino acid substitutions. The two amino acid changes that fall within the A chain of the toxin (G79D and E162K) were separately analyzed by substituting a variety of other amino acids at these sites. The substitution at position 79 (G79D) singularly appears to account for the loss of enzymatic activity found in CRM 228.

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