Related Experiment Videos
Cytolethal distending toxin: limited damage as a strategy to modulate cellular functions
María Lara-Tejero1, Jorge E Galán
1Section of Microbial Pathogenesis, Boyer Center for Molecular Medicine, Yale School of Medicine, New Haven, CT 06536, USA.
Trends in Microbiology
|February 28, 2002
Summary
Pathogenic bacteria use cytolethal distending toxin (CDT) to manipulate host cells. The toxin
Area of Science:
- Microbiology
- Molecular Biology
- Cell Biology
Background:
- Pathogen-host interactions involve complex interfaces and bacterial strategies to manipulate host cells.
- Cytolethal distending toxin (CDT) is a toxin produced by Gram-negative bacteria that controls eukaryotic cell cycle progression.
Purpose of the Study:
- To elucidate the mechanism of action of cytolethal distending toxin (CDT) in manipulating host cell functions.
- To identify the active subunit and delivery mechanism of CDT.
Main Methods:
- Analysis of CDT as a tripartite AB toxin.
- Identification of CdtB as the active subunit responsible for nuclease activity.
Main Results:
- CdtB, the active subunit, causes limited DNA damage via nuclease activity.
- This DNA damage triggers a host DNA-damage response, leading to cell cycle arrest.
- CDT functions as an AB toxin, with CdtB as the 'A' subunit and CdtA/CdtC forming the 'B' subunit for delivery.
Conclusions:
- CDT's mechanism involves inducing limited DNA damage to modulate host cell functions.
- The tripartite AB toxin structure facilitates the targeted delivery of the active CdtB subunit.
- Understanding CDT action provides insights into bacterial pathogenesis and host cell manipulation strategies.