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Cytolethal distending toxin: a bacterial bullet targeted to nucleus
Masaru Ohara1, Eric Oswald, Motoyuki Sugai
1Department of Bacteriology, Graduate School of Biomedical Sciences, Hiroshima University, 1-2-3 Kasumi, Minami-ku, Hiroshima 734-8553, Japan.
Journal of Biochemistry
|December 31, 2004
Summary
Cytolethal distending toxin (Cdt) causes cell cycle arrest by damaging host DNA. This bacterial toxin
Area of Science:
- Microbiology
- Toxicology
- Cell Biology
Background:
- Cytolethal distending toxin (Cdt) is a bacterial protein toxin.
- Cdts are produced by pathogenic bacteria linked to chronic infections.
- These toxins disrupt eukaryotic cell functions.
Purpose of the Study:
- To elucidate the mechanism of Cdt action on host cells.
- To understand how Cdt contributes to chronic infections.
Main Methods:
- Analysis of the Cdt ternary complex structure (CdtA, CdtB, CdtC).
- Investigating the role of CdtB as the active subunit.
- Assessing Cdt-induced DNA damage and cell cycle effects.
Main Results:
- Cdt induces limited DNA damage to the host cell chromosome.
- This damage triggers cell cycle checkpoints, leading to G2 arrest.
- Cdt also induces apoptotic cell death in lymphocytes.
Conclusions:
- Cdt employs a novel strategy involving DNA damage to control host cells.
- Understanding Cdt function offers insights into bacterial pathogenesis and host-pathogen interactions.
- Cdt's role in lymphocyte apoptosis may be crucial for chronic infection persistence.