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Diphtheria is an acute, toxin-mediated infectious disease that primarily affects the upper respiratory tract. It is caused by Corynebacterium diphtheriae, a Gram-positive, pleomorphic rod that lacks spore-forming capability and exhibits a characteristic club-shaped morphology under microscopic examination. While C. diphtheriae can asymptomatically colonize mucosal surfaces, clinical disease manifests only when the bacterial strain is lysogenized by a specific β-corynephage. This phage...
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Insights into diphthamide, key diphtheria toxin effector.

Wael Abdel-Fattah1, Viktor Scheidt, Shanow Uthman

  • 1Institut für Biologie, FG Mikrobiologie, Universität Kassel, Kassel, Germany. wael@uni-kassel.de

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Diphtheria toxin (DT) targets eukaryotic translation elongation factor 2 (eEF2). Researchers identified key protein interactions and domains in yeast essential for diphthamide synthesis, a modification crucial for DT action.

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Yeast Genetics

Background:

  • Diphtheria toxin (DT) inhibits eukaryotic translation elongation factor 2 (eEF2) via ADP-ribosylation.
  • This modification requires diphthamide, a unique histidine residue on eEF2.
  • In budding yeast, seven genes (DPH1-DPH7) are involved in diphthamide formation.

Purpose of the Study:

  • To investigate the synthesis of diphthamide and the interactions among Dph proteins.
  • To elucidate the functional domains of Dph proteins involved in eEF2 modification.
  • To understand the relationship between diphthamide synthesis and sensitivity to eEF2 inhibitors.

Main Methods:

  • Expression of Dph proteins in E. coli.
  • Co-immune precipitation in yeast to map protein-protein interactions.
  • Progressive truncation of the DPH1 gene.
  • Site-specific mutagenesis of DPH6.
  • Analysis of mutant sensitivity to DPH5 overexpression and sordarin.

Main Results:

  • Dph1 and Dph2 interact and form a complex with Dph3.
  • N- and C-terminal domains of Dph1 are critical for diphthamide synthesis, DT action, and sordarin cytotoxicity.
  • Dph1 truncation mutants show sensitivity to DPH5 overexpression.
  • Dph6 mutants, lacking diphthamide, are resistant to DPH5 overexpression.
  • An ATP-binding domain in Dph6 is essential for amidation and confers resistance to eEF2 inhibition.

Conclusions:

  • Dph1, Dph2, and Dph3 form a complex crucial for early steps in diphthamide synthesis.
  • Specific domains within Dph1 are vital for the modification and cellular response to eEF2 inhibitors.
  • The Dph6 protein's ATP-binding domain plays a key role in the amidation step and resistance mechanisms.