Shared more. Cited more. Safe forever.
    • advanced search
    • submit works
    • about
    • help
    • contact us
    • login
    View Item 
    •   MOspace Home
    • University of Missouri-Columbia
    • Graduate School - MU Theses and Dissertations (MU)
    • Theses and Dissertations (MU)
    • Dissertations (MU)
    • 2019 Dissertations (MU)
    • 2019 MU dissertations - Access restricted to MU
    • View Item
    •   MOspace Home
    • University of Missouri-Columbia
    • Graduate School - MU Theses and Dissertations (MU)
    • Theses and Dissertations (MU)
    • Dissertations (MU)
    • 2019 Dissertations (MU)
    • 2019 MU dissertations - Access restricted to MU
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.
    advanced searchsubmit worksabouthelpcontact us

    Browse

    All of MOspaceCommunities & CollectionsDate IssuedAuthor/ContributorTitleIdentifierThesis DepartmentThesis AdvisorThesis SemesterThis CollectionDate IssuedAuthor/ContributorTitleIdentifierThesis DepartmentThesis AdvisorThesis Semester

    Statistics

    Most Popular ItemsStatistics by CountryMost Popular AuthorsStatistics by Referrer

    Structural, biochemical, and inhibition studies of proline biosynthetic enzymes

    Christensen, Emily M.
    View/Open
    [PDF] ChristensenEmily.pdf (4.886Mb)
    Date
    2019
    Format
    Thesis
    Metadata
    [+] Show full item record
    Abstract
    [ACCESS RESTRICTED TO THE UNIVERSITY OF MISSOURI AT REQUEST OF AUTHOR.] Pyrroline-5-carboxylate reductase (PYCR) is the final enzyme in proline biosynthesis, catalyzing the NAD(P)H-dependent reduction of [Delta]1-pyrroline-5-carboxylate (P5C) to proline. Mutations in the PYCR1 gene alter mitochondrial function and cause the connective tissue disorder cutis laxa. Furthermore, PYCR1 is overexpressed in multiple cancers, and the PYCR1 knockout suppresses tumorigenic growth, suggesting PYCR1 is a potential cancer target. However, inhibitor development has been stymied by limited mechanistic details for the enzyme, particularly in light of a previous crystallographic study that placed the cofactor binding site in the C-terminal domain rather than the anticipated Rossmann fold of the N-terminal domain. To fill this gap, we report crystallographic, sedimentation velocity, and kinetics data for human PYCR1. Structures of binary complexes of PYCR1 with NADPH or proline determined at 1.9 A resolution provide insight into cofactor and substrate recognition. We see NADPH bound to the Rossmann fold, over 25 A from the previously proposed site. The 1.85 A resolution structure of a ternary complex containing NADPH and a P5C/proline analog provides a model of the Michaelis complex formed during hydride transfer. Sedimentation velocity shows that PYCR1 forms a concentration-dependent decamer in solution, consistent with the pentamer-of-dimers assembly seen crystallographically. Kinetic and mutational analysis confirmed several features seen in the crystal structure, including the importance of a hydrogen bond between Thr238 and the substrate as well as limited cofactor discrimination. We also report kinetic and structural data for PYCR1 complexed with multiple P5C/Pro analogs to probe the potential of PYCR1 as a cancer therapy target. Crystal structures of binary complexes of PYCR1 with L-tetrahydro-2-furoic acid (THFA),N-formyl L-proline (NFLP), thiazolidine-2-carboxylate (T2C), and thiazolidine-4-carboxylate (T4C) have been determined at 1.80-2.35 A resolution. We also present inhibition data for the forward reaction of P5C reduction to proline in the presence of each analog.
    URI
    https://hdl.handle.net/10355/76143
    https://doi.org/10.32469/10355/76143
    Degree
    Ph. D.
    Thesis Department
    Chemistry (MU)
    Rights
    Access to files is limited to the University of Missouri--Columbia.
    This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License.
    Collections
    • Chemistry electronic theses and dissertations (MU)
    • 2019 MU dissertations - Access restricted to MU

    Send Feedback
    hosted by University of Missouri Library Systems
     

     


    Send Feedback
    hosted by University of Missouri Library Systems