Analysis of Connections Between Host Cytoplasmic Processing Bodies and Viral Life Cycles

Persistent Link:
http://hdl.handle.net/10150/194209
Title:
Analysis of Connections Between Host Cytoplasmic Processing Bodies and Viral Life Cycles
Author:
Beckham, Carla Jolene
Issue Date:
2007
Publisher:
The University of Arizona.
Rights:
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Abstract:
In the past few years, cytoplasmic processing bodies (P-Bodies) have been identified in eukaryotic cells. P-bodies have roles in translational repression, mRNA storage, mRNA decay and are conserved cytoplasmic aggregations of non-translating mRNAs in conjunction with translation repression and mRNA degradation factors. In this work, I, in collaboration with others provide evidence for a new biological role for P-bodies in viral life cycles. This work can be summarized thus:In a collaborative effort, I have identified connections between retrovirallike transposon life cycles and P-bodies. For example, genetic evidence in yeast indicates that key proteins within P-bodies are required for the life cycles of the Ty1 and Ty3 retrotransposons. Moreover, Ty3 genomic RNA (gRNA) as well as viral structural proteins accumulate in P-bodies, suggesting that P-bodies may serve as sites of viral assembly.Second, I have shown, with assistance of collaborators, that the positivestrand RNA virus, Brome Mosaic Virus (BMV) gRNA accumulates in P-bodies Moreover, viral RNA dependent RNA polymerase (RdRp) colocalizes with and co-immunoprecipitates with the P-body protein Lsm1p, suggesting that P-bodies may participate in viral replication. Remarkably, the accumulation BMV gRNA in P-bodies is dependent on cis-elements that have been demonstrated to play critical roles in viral RNA replication.The identification of P-bodies as sites of accumulation of viral gRNA and viral proteins of both retro-virus like elements and positive-stranded RNA viruses, expands the list of important biological roles played by P-bodies. Since P-body proteins and structure are highly conserved, these findings imply that Pbodies will be important for other RNA viruses.
Type:
text; Electronic Dissertation
Keywords:
RNA viruses; P-bodies; Retrovirus; cis-element; replication complex
Degree Name:
PhD
Degree Level:
doctoral
Degree Program:
Cell Biology & Anatomy; Graduate College
Degree Grantor:
University of Arizona
Advisor:
Parker, Roy R.
Committee Chair:
Parker, Roy R.

Full metadata record

DC FieldValue Language
dc.language.isoENen_US
dc.titleAnalysis of Connections Between Host Cytoplasmic Processing Bodies and Viral Life Cyclesen_US
dc.creatorBeckham, Carla Joleneen_US
dc.contributor.authorBeckham, Carla Joleneen_US
dc.date.issued2007en_US
dc.publisherThe University of Arizona.en_US
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en_US
dc.description.abstractIn the past few years, cytoplasmic processing bodies (P-Bodies) have been identified in eukaryotic cells. P-bodies have roles in translational repression, mRNA storage, mRNA decay and are conserved cytoplasmic aggregations of non-translating mRNAs in conjunction with translation repression and mRNA degradation factors. In this work, I, in collaboration with others provide evidence for a new biological role for P-bodies in viral life cycles. This work can be summarized thus:In a collaborative effort, I have identified connections between retrovirallike transposon life cycles and P-bodies. For example, genetic evidence in yeast indicates that key proteins within P-bodies are required for the life cycles of the Ty1 and Ty3 retrotransposons. Moreover, Ty3 genomic RNA (gRNA) as well as viral structural proteins accumulate in P-bodies, suggesting that P-bodies may serve as sites of viral assembly.Second, I have shown, with assistance of collaborators, that the positivestrand RNA virus, Brome Mosaic Virus (BMV) gRNA accumulates in P-bodies Moreover, viral RNA dependent RNA polymerase (RdRp) colocalizes with and co-immunoprecipitates with the P-body protein Lsm1p, suggesting that P-bodies may participate in viral replication. Remarkably, the accumulation BMV gRNA in P-bodies is dependent on cis-elements that have been demonstrated to play critical roles in viral RNA replication.The identification of P-bodies as sites of accumulation of viral gRNA and viral proteins of both retro-virus like elements and positive-stranded RNA viruses, expands the list of important biological roles played by P-bodies. Since P-body proteins and structure are highly conserved, these findings imply that Pbodies will be important for other RNA viruses.en_US
dc.typetexten_US
dc.typeElectronic Dissertationen_US
dc.subjectRNA virusesen_US
dc.subjectP-bodiesen_US
dc.subjectRetrovirusen_US
dc.subjectcis-elementen_US
dc.subjectreplication complexen_US
thesis.degree.namePhDen_US
thesis.degree.leveldoctoralen_US
thesis.degree.disciplineCell Biology & Anatomyen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.contributor.advisorParker, Roy R.en_US
dc.contributor.chairParker, Roy R.en_US
dc.contributor.committeememberWilson, Jeanen_US
dc.contributor.committeememberDieckmann, Carolen_US
dc.contributor.committeememberJorgensen, Richarden_US
dc.contributor.committeememberEugene Gerneren_US
dc.identifier.proquest2074en_US
dc.identifier.oclc659747182en_US
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