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Characterization of the multimeric Eps complex required for cholera toxin secretion.

M Sandkvist1, M Bagdasarian, S P Howard

  • 1Department of Biochemistry, American Red Cross, Rockville, MD 20855, USA. sandkvis@usa.redcross.org

International Journal of Medical Microbiology : IJMM
|December 9, 2000
PubMed
Summary

Researchers investigated the secretion of cholera toxin by Vibrio cholerae. They discovered that key components of the Extracellular Protein Secretion (Eps) machinery form a stable complex, shedding light on toxin secretion mechanisms.

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Directed polar secretion of protease from single cells of Vibrio cholerae via the type II secretion pathway.

Proceedings of the National Academy of Sciences of the United States of America·2001

Area of Science:

  • Microbiology
  • Molecular Biology
  • Biochemistry

Background:

  • Vibrio cholerae causes cholera, a severe diarrheal disease.
  • Cholera toxin secretion is crucial for V. cholerae pathogenesis.
  • The type II secretion pathway, involving the Extracellular Protein Secretion (Eps) machinery, mediates toxin release.

Purpose of the Study:

  • To elucidate the structural organization of the Eps secretion apparatus.
  • To understand the mechanism of cholera toxin translocation across the outer membrane.
  • To characterize key components of the Eps machinery.

Main Methods:

  • Purification of EpsE, EpsL, and EpsM proteins.
  • Biochemical characterization of purified Eps components.
  • Analysis of Eps protein complex formation.

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Main Results:

  • EpsE, EpsL, and EpsM were successfully purified.
  • These three components form a stable, multi-protein complex.
  • The complex spans the cytoplasmic membrane, suggesting a role in toxin secretion.

Conclusions:

  • The EpsE, EpsL, and EpsM complex is a fundamental part of the V. cholerae type II secretion system.
  • This complex likely serves as an anchor or platform for toxin secretion.
  • Further research into the Eps apparatus will illuminate V. cholerae pathogenesis.