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Laboratory Techniques Used to Maintain and Differentiate Biotypes of Vibrio cholerae Clinical and Environmental Isolates
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A protein-based pentavalent inhibitor of the cholera toxin B-subunit

Thomas R Branson1, Tom E McAllister, Jaime Garcia-Hartjes

  • 1School of Chemistry and Astbury Centre for Structural Molecular Biology, University of Leeds, Leeds, LS2 9JT (UK).

Angewandte Chemie (International Ed. in English)
|July 4, 2014
PubMed

Insights

Researchers developed a potent pentavalent neoglycoprotein inhibitor to block bacterial toxins like cholera toxin (CT) from entering cells. This novel approach effectively prevents toxin-mediated diarrheal diseases by targeting multivalent protein/carbohydrate interactions.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Microbiology

Background:

  • Bacterial protein toxins cause life-threatening diarrheal diseases.
  • Toxins like cholera toxin (CT) enter cells via binding to cell membrane glycolipids.
  • Inhibiting these toxin-glycolipid interactions can prevent cellular entry and disease.

Purpose of the Study:

  • To develop an effective multivalent inhibitor against bacterial toxins.
  • To create a potent inhibitor by modifying a protein scaffold to match toxin size and valency.
  • To investigate a novel strategy for inhibiting toxin-mediated cellular entry.

Main Methods:

  • Site-specific modification of a protein scaffold.
  • Creation of a pentavalent neoglycoprotein inhibitor.
  • Assay of inhibitor potency against the cholera toxin B-subunit (CTB).

Main Results:

  • The pentavalent neoglycoprotein achieved an IC50 of 104 pM against CTB.
  • This represents the most potent pentavalent inhibitor reported for CTB to date.
  • Complexation formed a stable protein heterodimer between the inhibitor and CTB.

Conclusions:

  • Site-specific modification of protein scaffolds offers a viable route to potent multivalent inhibitors.
  • This inhibition strategy is applicable to various multivalent receptors.
  • The study opens new avenues for protein assembly and therapeutic development against toxin-mediated diseases.
Keywords:
carbohydratesglycoproteinsmultivalencyprotein modificationsprotein structures

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