Comparative active-site mutation study of human and Caenorhabditis elegans thymidine kinase 1.

Tine Skovgaard, Ulla Uhlin, Birgitte Munch-Petersen

    Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

    Resumé

    The first step for the intracellular retention of several anticancer or antiviral nucleoside analogues is the addition of a phosphate group catalysed by a deoxyribonucleoside kinase such as thymidine kinase 1 (TK1). Recently, human TK1 (HuTK1) has been crystallized and characterized using different ligands. To improve our understanding of TK1 substrate specificity, we performed a detailed, mutation-based comparative structure-function study of the active sites of two thymidine kinases: HuTK1 and Caenorhabditis elegans TK1 (CeTK1). Specifically, mutations were introduced into the hydrophobic pocket surrounding the substrate base. In CeTK1, some of these mutations led to increased activity with deoxycytidine and deoxyguanosine, two unusual substrates for TK1-like kinases. In HuTK1, mutation of T163 to S resulted in a kinase with a 140-fold lower K(m) for the antiviral nucleoside analogue 3'-azido-3'-deoxythymidine (AZT) compared with the natural substrate thymidine. The crystal structure of the T163S-mutated HuTK1 reveals a less ordered conformation of the ligand thymidine triphosphate compared with the wild-type structure but the cause of the changed specificity towards AZT is not obvious. Based on its highly increased AZT activity relative to thymidine activity this TK1 mutant could be suitable for suicide gene therapy.
    OriginalsprogEngelsk
    TidsskriftF E B S Journal
    Vol/bind279
    Udgave nummer10
    Sider (fra-til)1777-1787
    Antal sider11
    ISSN1742-464X
    DOI
    StatusUdgivet - maj 2012

    Emneord

    • Thymidine kinase 1
    • nucleoside analogues
    • mutagenesis
    • crystal structure
    • enzyme kinetics

    Citer dette

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    abstract = "The first step for the intracellular retention of several anticancer or antiviral nucleoside analogues is the addition of a phosphate group catalysed by a deoxyribonucleoside kinase such as thymidine kinase 1 (TK1). Recently, human TK1 (HuTK1) has been crystallized and characterized using different ligands. To improve our understanding of TK1 substrate specificity, we performed a detailed, mutation-based comparative structure-function study of the active sites of two thymidine kinases: HuTK1 and Caenorhabditis elegans TK1 (CeTK1). Specifically, mutations were introduced into the hydrophobic pocket surrounding the substrate base. In CeTK1, some of these mutations led to increased activity with deoxycytidine and deoxyguanosine, two unusual substrates for TK1-like kinases. In HuTK1, mutation of T163 to S resulted in a kinase with a 140-fold lower K(m) for the antiviral nucleoside analogue 3'-azido-3'-deoxythymidine (AZT) compared with the natural substrate thymidine. The crystal structure of the T163S-mutated HuTK1 reveals a less ordered conformation of the ligand thymidine triphosphate compared with the wild-type structure but the cause of the changed specificity towards AZT is not obvious. Based on its highly increased AZT activity relative to thymidine activity this TK1 mutant could be suitable for suicide gene therapy.",
    keywords = "Thymidine kinase 1, nucleoside analogues, mutagenesis, crystal structure, enzyme kinetics",
    author = "Tine Skovgaard and Ulla Uhlin and Birgitte Munch-Petersen",
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    Comparative active-site mutation study of human and Caenorhabditis elegans thymidine kinase 1. / Skovgaard, Tine; Uhlin, Ulla; Munch-Petersen, Birgitte.

    I: F E B S Journal, Bind 279, Nr. 10, 05.2012, s. 1777-1787.

    Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

    TY - JOUR

    T1 - Comparative active-site mutation study of human and Caenorhabditis elegans thymidine kinase 1.

    AU - Skovgaard, Tine

    AU - Uhlin, Ulla

    AU - Munch-Petersen, Birgitte

    PY - 2012/5

    Y1 - 2012/5

    N2 - The first step for the intracellular retention of several anticancer or antiviral nucleoside analogues is the addition of a phosphate group catalysed by a deoxyribonucleoside kinase such as thymidine kinase 1 (TK1). Recently, human TK1 (HuTK1) has been crystallized and characterized using different ligands. To improve our understanding of TK1 substrate specificity, we performed a detailed, mutation-based comparative structure-function study of the active sites of two thymidine kinases: HuTK1 and Caenorhabditis elegans TK1 (CeTK1). Specifically, mutations were introduced into the hydrophobic pocket surrounding the substrate base. In CeTK1, some of these mutations led to increased activity with deoxycytidine and deoxyguanosine, two unusual substrates for TK1-like kinases. In HuTK1, mutation of T163 to S resulted in a kinase with a 140-fold lower K(m) for the antiviral nucleoside analogue 3'-azido-3'-deoxythymidine (AZT) compared with the natural substrate thymidine. The crystal structure of the T163S-mutated HuTK1 reveals a less ordered conformation of the ligand thymidine triphosphate compared with the wild-type structure but the cause of the changed specificity towards AZT is not obvious. Based on its highly increased AZT activity relative to thymidine activity this TK1 mutant could be suitable for suicide gene therapy.

    AB - The first step for the intracellular retention of several anticancer or antiviral nucleoside analogues is the addition of a phosphate group catalysed by a deoxyribonucleoside kinase such as thymidine kinase 1 (TK1). Recently, human TK1 (HuTK1) has been crystallized and characterized using different ligands. To improve our understanding of TK1 substrate specificity, we performed a detailed, mutation-based comparative structure-function study of the active sites of two thymidine kinases: HuTK1 and Caenorhabditis elegans TK1 (CeTK1). Specifically, mutations were introduced into the hydrophobic pocket surrounding the substrate base. In CeTK1, some of these mutations led to increased activity with deoxycytidine and deoxyguanosine, two unusual substrates for TK1-like kinases. In HuTK1, mutation of T163 to S resulted in a kinase with a 140-fold lower K(m) for the antiviral nucleoside analogue 3'-azido-3'-deoxythymidine (AZT) compared with the natural substrate thymidine. The crystal structure of the T163S-mutated HuTK1 reveals a less ordered conformation of the ligand thymidine triphosphate compared with the wild-type structure but the cause of the changed specificity towards AZT is not obvious. Based on its highly increased AZT activity relative to thymidine activity this TK1 mutant could be suitable for suicide gene therapy.

    KW - Thymidine kinase 1

    KW - nucleoside analogues

    KW - mutagenesis

    KW - crystal structure

    KW - enzyme kinetics

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