Characterization of cricket paralysis virus-host interaction and viral protein synthesis

Viruses are obligate parasites that have evolved strategies to recruit the translational machinery and inhibit antiviral defences. A relatively abundant family of positive-sense, monopartitate single stranded RNA viruses, dicistrovirus, remains relatively uncharacterized. Dicistroviruses are infecti...

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Main Author: Khong, Anthony
Language:English
Published: University of British Columbia 2015
Online Access:http://hdl.handle.net/2429/54692
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spelling ndltd-UBC-oai-circle.library.ubc.ca-2429-546922018-01-05T17:28:31Z Characterization of cricket paralysis virus-host interaction and viral protein synthesis Khong, Anthony Viruses are obligate parasites that have evolved strategies to recruit the translational machinery and inhibit antiviral defences. A relatively abundant family of positive-sense, monopartitate single stranded RNA viruses, dicistrovirus, remains relatively uncharacterized. Dicistroviruses are infectious to arthopods and have impacted a number of agricultural industries. Dicistroviruses, as indicated by their name, contain two open reading frames (ORFs). The 5'-untranslated internal ribosome entry site (5'-UTR IRES) directs translation of ORF1 which encodes non-structural proteins and the intergenic (IGR) IRES directs translation of ORF2 which encodes structural proteins. How dicistroviruses affect the host is not completely understood. My thesis focuses on several host pathways that are modulated during cricket paralysis virus (CrPV) infection, a model dicistrovirus. During CrPV infection, I discovered stress granule (SG) formation is inhibited but granules containing poly(A)+ mRNAs form. Furthermore, I discovered a viral protein, CrPV 1A, that inhibits the SG pathway. Upon further characterization of CrPV 1A, I discovered the viral protein also stimulates 5'-dependent translation and 5'IRES dependent translation. Finally, I found IGR IRES-dependent translation is delayed compared to 5'-UTR IRES-dependent translation, thus providing a viral strategy of expressing non-structural proteins such as the replicase and protease prior to the synthesis of structural proteins for viral packaging. This thesis provides insights into the key strategies of dicistrovirus infection, its viral life cycle and the innate immune responses in insect cells. Medicine, Faculty of Biochemistry and Molecular Biology, Department of Graduate 2015-08-28T21:04:05Z 2015-08-28T21:04:05Z 2015 2015-11 Text Thesis/Dissertation http://hdl.handle.net/2429/54692 eng Attribution-NonCommercial-NoDerivs 2.5 Canada http://creativecommons.org/licenses/by-nc-nd/2.5/ca/ University of British Columbia
collection NDLTD
language English
sources NDLTD
description Viruses are obligate parasites that have evolved strategies to recruit the translational machinery and inhibit antiviral defences. A relatively abundant family of positive-sense, monopartitate single stranded RNA viruses, dicistrovirus, remains relatively uncharacterized. Dicistroviruses are infectious to arthopods and have impacted a number of agricultural industries. Dicistroviruses, as indicated by their name, contain two open reading frames (ORFs). The 5'-untranslated internal ribosome entry site (5'-UTR IRES) directs translation of ORF1 which encodes non-structural proteins and the intergenic (IGR) IRES directs translation of ORF2 which encodes structural proteins. How dicistroviruses affect the host is not completely understood. My thesis focuses on several host pathways that are modulated during cricket paralysis virus (CrPV) infection, a model dicistrovirus. During CrPV infection, I discovered stress granule (SG) formation is inhibited but granules containing poly(A)+ mRNAs form. Furthermore, I discovered a viral protein, CrPV 1A, that inhibits the SG pathway. Upon further characterization of CrPV 1A, I discovered the viral protein also stimulates 5'-dependent translation and 5'IRES dependent translation. Finally, I found IGR IRES-dependent translation is delayed compared to 5'-UTR IRES-dependent translation, thus providing a viral strategy of expressing non-structural proteins such as the replicase and protease prior to the synthesis of structural proteins for viral packaging. This thesis provides insights into the key strategies of dicistrovirus infection, its viral life cycle and the innate immune responses in insect cells. === Medicine, Faculty of === Biochemistry and Molecular Biology, Department of === Graduate
author Khong, Anthony
spellingShingle Khong, Anthony
Characterization of cricket paralysis virus-host interaction and viral protein synthesis
author_facet Khong, Anthony
author_sort Khong, Anthony
title Characterization of cricket paralysis virus-host interaction and viral protein synthesis
title_short Characterization of cricket paralysis virus-host interaction and viral protein synthesis
title_full Characterization of cricket paralysis virus-host interaction and viral protein synthesis
title_fullStr Characterization of cricket paralysis virus-host interaction and viral protein synthesis
title_full_unstemmed Characterization of cricket paralysis virus-host interaction and viral protein synthesis
title_sort characterization of cricket paralysis virus-host interaction and viral protein synthesis
publisher University of British Columbia
publishDate 2015
url http://hdl.handle.net/2429/54692
work_keys_str_mv AT khonganthony characterizationofcricketparalysisvirushostinteractionandviralproteinsynthesis
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