Rho-glucosylating Clostridium difficile toxins A and B: New insights into structure and function

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Abstract

Clostridium difficile causes pseudomembranous colitis and is responsible for many cases of nosocomial antibiotic-associated diarrhea. Major virulence factors of C. difficile are the glucosylating exotoxins A and B. Both toxins enter target cells in a pH- dependent manner from endosomes by forming pores. They translocate the N-terminal catalytic domains into the cytosol of host cells and inactivate Rho guanosine triphosphatases by glucosylation. The crystal structure of the catalytic domain of toxin B was solved in a complex with uridine diphosphate, glucose, and manganese ion, exhibiting a folding of type A family glycosyltransferases. Crystallization of fragments of the C-terminus of toxin A, which is characterized by polypeptide repeats, revealed a solenoid-like structure often found in bacterial cell surface proteins. These studies, which provide new insights into structure, uptake, and function of the family of clostridial glucosylating toxins, are reviewed. © 2007 Oxford University Press.

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Jank, T., Giesemann, T., & Aktories, K. (2007, April). Rho-glucosylating Clostridium difficile toxins A and B: New insights into structure and function. Glycobiology. https://doi.org/10.1093/glycob/cwm004

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