Molecular characterization of key diphtheria toxin:receptor interactions

Joanna S. Brooke, Jeong Heon Cha

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12 Citations (Scopus)

Abstract

The major amino acids necessary for diphtheria toxin (DT) binding to its receptor have been identified previously. Studies by W. H. Shen et al. (J. Biol. Chem. 269, 29077-29084, 1994) and by J. H. Cha et al. (Mol. Microbiol. 29 (5), 1275-1284, 1998) suggested that the positively charged nature of the single amino acid residue, 516Lys of DT, is crucial for binding to the DT receptor, whereas the negatively charged 141Glu of the DT receptor is the most important residue for toxin binding. Here, we hypothesize that key interactions occur between these two oppositely charged amino acid residues. Reciprocal substitution of the residues at these positions between the toxin and the receptor was performed, which resulted in a partial reconstitution of the toxin:receptor interaction. This study provides the first biological data that characterizes the specific interaction of these two key residues with each other and also the additional interactions between other positively charged residues of DT and 141Glu of the DT receptor. (C) 2000 Academic Press.

Original languageEnglish
Pages (from-to)374-381
Number of pages8
JournalBiochemical and Biophysical Research Communications
Volume275
Issue number2
DOIs
Publication statusPublished - 2000 Aug 28

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All Science Journal Classification (ASJC) codes

  • Biophysics
  • Biochemistry
  • Molecular Biology
  • Cell Biology

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