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AB5 Preassembly Is Not Required for Shiga Toxin Activity.

Christine A Pellino1, Sayali S Karve1, Suman Pradhan1

  • 1Department of Molecular Genetics, Biochemistry and Microbiology, University of Cincinnati, Cincinnati, Ohio, USA.

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Shiga toxin (Stx) from E. coli circulates as separate A and B subunits, not a pre-formed complex. Preventing subunit assembly offers a potential new treatment for Stx-associated illnesses.

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Area of Science:

  • Microbiology
  • Toxicology
  • Immunology

Background:

  • Shiga toxin (Stx)-producing Escherichia coli (STEC) causes severe foodborne illness and hemolytic-uremic syndrome (HUS).
  • Stx is an AB5 toxin, with the A subunit inhibiting protein synthesis and the B subunit mediating cell binding and entry.
  • Current treatments for HUS are limited, and antibiotics are contraindicated as they can increase Stx production.

Purpose of the Study:

  • To investigate the assembly and toxicity of Shiga toxin (Stx).
  • To explore the potential of targeting Stx assembly for therapeutic interventions against Stx-associated diseases.

Main Methods:

  • Characterization of Stx subunit assembly and conformation upon release from STEC.
  • In vivo toxicity studies in mice using unassembled Stx and Stx subunit association inhibitors.
  • Assessment of therapeutic efficacy of A-subunit peptides that block Stx assembly.

Main Results:

  • Contrary to prevailing assumptions, Stx is released by STEC as unassembled A and B subunits, not a preformed AB5 complex.
  • Unassembled Stx subunits are lethal to mice, with assembly occurring at the target cell membrane.
  • Disruption of A- and B-subunit association using enzymatically inactive A-subunit peptides protected mice from lethal Stx challenge.

Conclusions:

  • Shiga toxin assembly is not required for toxicity and occurs post-release at the cell surface.
  • Targeting the assembly of Stx subunits presents a promising novel therapeutic strategy for HUS and other Stx-mediated conditions.