Clostridium sordellii infections cause gangrene and edema in humans and gastrointestinal infections in livestock. The two principle virulence factors, TcsH and TcsL, are highly homologous to C. difficile TcdA and TcdB, respectively. Experiments to compare the effects of TcsH and TcsL to TcdA and TcdB show that TcsH induces necrotic cell death similarly to TcdB while TcsL induces apoptotic cell death. Further work focuses on TcsL, which has two enzymatic domains, an N-terminal glucosyltransferase domain (GTD) and an autoprocessing domain responsible for release of the GTD within the cell. The GTD can then use its N-terminal membrane localization domain (MLD) for orientation on membranes and modification of GTPases. The use of conditionally immortalized murine pulmonary microvascular endothelial cells provides a model for the study of TcsL functional activities. Point mutations that disrupt the glucosyltransferase, autoprocessing, or membrane localization activities are introduced into a recombinant version of TcsL, and the activities of these mutants are compared to those of wild-type toxin. All mutants are defective or impaired in cytotoxicity but differ in their modification of Rac1 and Ras. The data suggest a model where differences in GTPase localization dictate cellular responses to intoxication and highlight the importance of autoprocessing in the function of TcsL.
| Identifer | oai:union.ndltd.org:VANDERBILT/oai:VANDERBILTETD:etd-01042016-143720 |
| Date | 04 March 2016 |
| Creators | Craven, Ryan Eric |
| Contributors | Earl Ruley, Eric Skaar, Richard Peek, D. Borden Lacy |
| Publisher | VANDERBILT |
| Source Sets | Vanderbilt University Theses |
| Language | English |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.library.vanderbilt.edu/available/etd-01042016-143720/ |
| Rights | unrestricted, I hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to Vanderbilt University or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report. |
Page generated in 0.0027 seconds