Date of Award
6-1-2014
Document Type
Dissertation
Degree Name
Ph.D.
Organizational Unit
College of Natual Science and Mathematics
First Advisor
Scott D. Pegan, Ph.D.
Second Advisor
Joseph Angleson
Third Advisor
Martin Margittai
Fourth Advisor
Andrei Kutateladze
Keywords
Crimean-Congo Hemorrhagic Fever Virus (CCHF), Deubiquitination, Dugbe, Nairovirus, Ubiquitin, Ovarian tumor domain protease (vOTU)
Abstract
My research focuses on understanding the substrate specificity of the viral homolog of the ovarian tumor domain protease superfamily (vOTU) from nairoviruses, and the structural reasons for their specificities. The vOTU from the Crimean-Congo Hemorrhagic Fever Virus (CCHFV) has been implicated in the down-regulation of the innate immune response through its ability to cleave post-translational modifications via Ubiquitin (Ub) as well as the Ub-like interferon-stimulated gene 15 (ISG15). vOTU homologs have been found in numerous viruses across several families. Moreover, the effects of these viruses range in severity from mild flu-like symptoms to mortality depending on the species of the infected host. As such, several nairovirus vOTUs including those from the Dugbe Virus (DUGV), Erve Virus (ERVEV), and CCHFV were subjected to enzymological studies to gain insight into substrate specificity. These studies revealed that even vOTUs from the same viral family have differing specificities for Ub and ISG15. Furthermore, these preferences extend to include the different polymeric moieties of Ub. In order to gain insight into any structural reasoning for these substrate predilections, the X-ray crystal structures of the vOTUs from both CCHFV and DUGV were each solved covalently bound with Ub. These structures exposed unique secondary structure elements compared to other members of the OTU superfamily that offer understanding into why certain vOTUs, such as that from CCHFV, can possess robust activity for Ub and ISG15. Likewise, the crystallographic data point to the primary structure of the vOTUs as the main driving force for divergence between nairovirus vOTU specificity.
Publication Statement
Copyright is held by the author. User is responsible for all copyright compliance.
Rights Holder
Glenn C. Capodagli
Provenance
Received from ProQuest
File Format
application/pdf
Language
en
File Size
138 p.
Recommended Citation
Capodagli, Glenn C., "Biophysical Characterization of the vOTU Proteases from the CCHF and Dugbe Nairoviruses" (2014). Electronic Theses and Dissertations. 111.
https://digitalcommons.du.edu/etd/111
Copyright date
2014
Discipline
Biophysics