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oai:mountainscholar.org:10217/794492025-12-30T03:24:52Zcom_10217_100532com_10217_100000com_10217_100350com_10217_100303col_10217_100538col_10217_100351

Kortus, Matt, author Peersen, Olve, advisor Ho, P. Shing, committee member Suchman, Erica, committee member 2007-01-03T05:36:18Z 2007-01-03T05:36:18Z 2011 Kortus_colostate_0053N_10747.pdf http://hdl.handle.net/10217/79449 https://doi.org/10.25675/3.018582 Picornaviruses encode for and require a viral RNA-dependent RNA polymerase (RdRP) for genome replication. This enzyme synthesizes negative-sense RNA from the infecting positive sense genome producing a replicative intermediate. The negative sense RNA then serves as a template for synthesis of additional positive-sense RNA. To efficiently replicate the genome, RdRPs must form a stable and processive elongation complex (EC) by binding RNA, incorporating the first templating nucleotide, and undergoing a necessary conformational. Upon completion of these steps that comprise initiation, the newly formed EC is capable of rapidly replicating the viral genome. The work presented in this thesis 1) investigates the role that several basic and hydrophobic residues serve in forming and maintaining the poliovirus (PV) EC and 2) presents the crystal structure of a coxsackievirus (CV) EC. To determine the role of that several arginines, lysines, and tyrosines play in the PV polymerase, we assessed whether mutations to these residues affect initiation, elongation, or stability of the EC. The data indicates the basic residues within the fingers domain of the PV polymerase have a major role in binding RNA. In addition, data shows two tyrosine residues in particular are critical for formation and maintenance of the EC. Overall, the data provides evidence the fingers domain interacts with the template RNA in a manner not captured by crystal structures. Finally, we have solved the structure of a CVEC stalled after incorporation of four nucleotides. The CVEC structure closely matches the previously solved PVEC structure. In addition, one crystal form produced an elongation complex trapped in a translocation intermediate state. born digital masters theses English eng Colorado State University. Libraries 2000-2019 Copyright and other restrictions may apply. User is responsible for compliance with all applicable laws. For information about copyright law, please see https://libguides.colostate.edu/copyright. coxsackievirus polymerase poliovirus crystallography Role of basic and hydrophobic residues in the poliovirus polymerase elongation complex and the structure of a coxsackievirus polymerase elongation complex Text Master of Science (M.S.) Masters Biochemistry and Molecular Biology Colorado State University This Item is protected by copyright and/or related rights (https://rightsstatements.org/vocab/InC/1.0/). You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s). open.access