Structural and functional analysis of the Vaccinia virus O1 virulence protein
dc.access.option | Open Access | |
dc.contributor.advisor | Mannie, Mark D. | |
dc.contributor.author | Weeks, Anastasia C. | |
dc.contributor.department | Microbiology and Immunology | |
dc.date.accessioned | 2017-08-09T16:40:38Z | |
dc.date.available | 2018-03-14T18:00:41Z | |
dc.date.created | 2017-08 | |
dc.date.issued | 2017-07-26 | |
dc.date.submitted | August 2017 | |
dc.date.updated | 2017-08-07T22:19:36Z | |
dc.degree.department | Microbiology and Immunology | |
dc.degree.discipline | MS-Biomedical Science | |
dc.degree.grantor | East Carolina University | |
dc.degree.level | Masters | |
dc.degree.name | M.S. | |
dc.description.abstract | Poxviruses are double-stranded DNA viruses capable of causing disfiguring and deadly disease in a wide range of hosts, from insects to mammals. Orthopoxviruses (OPXV) encode many proteins that are not essential for viral replication, but are responsible for vast differences in pathogenesis. Of the>200 proteins in the prototypical OPXV vaccinia virus (VACV), many remain functionally cryptic. The objective of these studies was to understand how the VACV O1 protein functions by investigating cell-specific effects that may contribute to virulence. The O1L gene is expressed early as the O1 protein, a 78 kDa protein that lacked N-linked glycosylation. These data are the first to demonstrate the reduced ability of an O1 deletion mutant ([delta]O1) to induce cell migration compared to the parental VACV Western Reserve strain (VACV-WR). [delta]O1-infected cell monolayers also exhibited reduced plaque diameter and clearance in plaque foci. These observations indicated that O1 is a significant contributor to VACV cytopathic effects (CPE) in vitro, in agreement with published reports. The results reported herein are the first to describe an altered immunological response with [delta]O1, as levels of anti-VACV immunoglobulin significantly increased with [delta]O1 infection at a time point (seven days post-infection) when VACV-WR induced VACV-specific antibody levels were comparable to sera from mock-infected mice. [delta]O1 was more immunogenic in an ex vivo antigen presentation assay, although mitogen-induced CD4+ T cell activation during [delta]O1 infection was equivalent to VACV-WR infection. Surprisingly, of all the immune cell types tested, [delta]O1 significantly differed from VACV-WR infection in the metabolic readout of only one cell type - RAW 264.7 macrophages. VACV-WR infected RAW 264.7 macrophages were more metabolically active than [delta]O1-infected cells at higher infectious doses, which may be indicative of a specialized niche for O1 function. Taken together, these data may provide clues into the mechanism of O1 virulence. | |
dc.embargo.lift | 2018-02-01 | |
dc.format.mimetype | application/pdf | |
dc.identifier.uri | http://hdl.handle.net/10342/6393 | |
dc.language.iso | en | |
dc.publisher | East Carolina University | |
dc.subject | poxvirus | |
dc.subject | O1L | |
dc.subject | mutant | |
dc.subject | immune | |
dc.subject | attenuated | |
dc.subject | plaque | |
dc.subject | morphology | |
dc.subject | cell | |
dc.subject | migration | |
dc.subject.mesh | Virulence | |
dc.subject.mesh | Viral Proteins | |
dc.subject.mesh | Vaccinia virus | |
dc.title | Structural and functional analysis of the Vaccinia virus O1 virulence protein | |
dc.type | Master's Thesis | |
dc.type.material | text |
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