Abstract
The large clostridial cytotoxins are a family of structurally and functionally related exotoxins from Clostridium difficile (toxins A and B), C. sordellii (lethal and hemorrhagic toxin) and C. novyi (α-toxin). The exotoxins are major pathogenicity factors which in addition to their in vivo effects are cytotoxic to cultured cell lines causing reorganization of the cytoskeleton accompanied by morphological changes. The exotoxins are single-chain protein toxins, which are constructed of three domains: receptor-binding, translocation and catalytic domain. These domains reflect the self-mediated cell entry via receptor-mediated endocytosis, translocation into the cytoplasm, and execution of their cytotoxic activity by an inherent enzyme activity. Enzymatically, the toxins catalyze the transfer of a glucosyl moiety from UDP-glucose to the intracellular target proteins which are the Rho and Ras GTPases. The covalent attachment of the glucose moiety to a conserved threonine within the effector region of the GTPases renders the Rho-GTPases functionally inactive. Whereas the molecular mode of cytotoxic effects is fully understood, the mechanisms leading to inflammatory processes in the context of disease (e.g., antibiotic-associated pseudomembranous colitis caused by Clostridium difficile) are less clear.
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Keywords
- Clostridium Difficile
- Pseudomembranous Colitis
- Lethal Toxin
- Clostridium Difficile Toxin
- Guanine Nucleotide Dissociation Inhibitor
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
Abbreviations
- CDAD:
-
Clostridium difficile-associated diarrhea
- C3:
-
ADP-ribosyltransferase C3 from Clostridium botulinum
- LCT:
-
Large clostridial cytotoxin
- TcdA:
-
Clostridium difficile toxin A
- TcdB:
-
Clostridium difficile toxin B
- TcsL:
-
Clostridium sordellii lethal toxin
- TcsH:
-
Clostridium sordellii hemorrhagic toxin
- TcnA:
-
Clostridium novyi alpha-toxin
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Just, I., Gerhard, R. (2004). Large clostridial cytotoxins. In: Reviews of Physiology, Biochemistry and Pharmacology. Reviews of Physiology, Biochemistry and Pharmacology, vol 152. Springer, Berlin, Heidelberg. https://doi.org/10.1007/s10254-004-0033-5
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