Download MendeleyStructure-function analysis of inositol hexakisphosphate-induced autoprocessing in Clostridium difficile toxin A.
Pruitt, R.N., Chagot, B., Cover, M., Chazin, W.J., Spiller, B., Lacy, D.B.(2009) J Biol Chem 284: 21934-21940
- PubMed: 19553670
- DOI: https://doi.org/10.1074/jbc.M109.018929
- Primary Citation of Related Structures:
3HO6 - PubMed Abstract:
The action of Clostridium difficile toxins A and B depends on inactivation of host small G-proteins by glucosylation. Cellular inositol hexakisphosphate (InsP6) induces an autocatalytic cleavage of the toxins, releasing an N-terminal glucosyltransferase domain into the host cell cytosol. We have defined the cysteine protease domain (CPD) responsible for autoprocessing within toxin A (TcdA) and report the 1.6 A x-ray crystal structure of the domain bound to InsP6. InsP6 is bound in a highly basic pocket that is separated from an unusual active site by a beta-flap structure. Functional studies confirm an intramolecular mechanism of cleavage and highlight specific residues required for InsP6-induced TcdA processing. Analysis of the structural and functional data in the context of sequences from similar and diverse origins highlights a C-terminal extension and a pi-cation interaction within the beta-flap that appear to be unique among the large clostridial cytotoxins.
Organizational Affiliation:
Departments of Microbiology and Immunology, Nashville, Tennessee 37232.
