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Hsp90 and its co-chaperones regulate the activity of human Argonaute2 in RNA-mediated silencing pathways Open Access


Other title
stress granules
RNA interference
P bodies
Type of item
Degree grantor
University of Alberta
Author or creator
Pare, Justin Mathew
Supervisor and department
Hobman, Tom (Department of Cell Biology)
Examining committee member and department
Fahlman, Richard (Department of Biochemistry)
Jan, Eric (Department of Biochemistry and Molecular Biology, University of British Columbia)
Simmonds, Andrew (Department of Cell Biology)
Campbell, Shelagh (Department of Biological Sciences)
Department of Cell Biology

Date accepted
Graduation date
Doctor of Philosophy
Degree level
The potent ability of small, double-stranded RNAs to silence gene expression was initially reported 1998, sparking revolutions in molecular biology and genetics. Since then, intensive research into the mechanism of RNA-mediated silencing has implicated the machinery of this pathway in the post-transcriptional regulation of the majority of mammalian genes. The major RNA effectors of silencing are miRNAs, and they target mRNAs encoding proteins involved in nearly every biological process including cell division, differentiation, development and death. These small RNAs directly associate with a member of the Argonaute family of proteins to form the RISC which functions as a component of large ribonucleoprotein complexes. Considering the extent and critical nature of the proteins regulated by the miRNA pathway, the assembly and activity of RISC is most certainly subject to extensive regulation by a variety of mechanisms. Hsp90 is an essential, ubiquitous and highly abundant molecular chaperone that is conserved throughout evolution. Interactions with its vast array of client proteins are coordinated by a network of co-chaperones, and its activity results in conformational changes within the structure of these clients through a process known as the chaperone cycle. A generally accepted role for Hsp90 in that maturation of its clients involves the stabilization of an unfavorable structural intermediate. The stabilization of these intermediates allows for the activation of the client. A role for Hsp90 in the RNAi pathway was initially suggested by data demonstrating a reduced interaction between the RNAi core components hAgo2 and Dicer in the absence of Hsp90 activity. In this thesis, I have demonstrated that Hsp90 activity, together with a subset of its co-chaperones, is important for the function of the miRNA-mediated post-transcriptional gene silencing machinery.
License granted by Justin Pare ( on 2011-09-09T16:35:53Z (GMT): Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of the above terms. The author reserves all other publication and other rights in association with the copyright in the thesis, and except as herein provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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