Development and validation of a cytochrome c-coupled assay for pteridine reductase 1 and dihydrofolate reductase

Emma J. Shanks, Han B. Ong, David A. Robinson, Stephen Thompson, Natasha Sienkiewicz, Alan H. Fairlamb, Julie A. Frearson

    Research output: Contribution to journalArticle

    17 Citations (Scopus)

    Abstract

    Activity of the pterin- and folate-salvaging enzymes pteridine reductase I (PTR1) and dihydrofolate reductase-thymidylate synthetase (DHFR-TS) is commonly measured as a decrease in absorbance at 340 nm, corresponding to oxidation of nicotinamide adenine dinucleotide phosphate (NADPH). Although this assay has been adequate to study the biology of these enzymes, it is not amenable to support any degree of routine inhibitor assessment because its restricted linearity is incompatible with enhanced throughput microtiter plate screening. In this article, we report the development and validation of a nonenzymatically coupled screening assay in which the product of the enzymatic reaction reduces cytochrome c, causing an increase in absorbance at 550 nm. We demonstrate this assay to be robust and accurate, and we describe its utility in supporting a structure-based design, small-molecule inhibitor campaign against Trypanosoma brucei PTR1 and DHFR-TS. (C) 2009 Elsevier Inc. All rights reserved.

    Original languageEnglish
    Pages (from-to)194-203
    Number of pages10
    JournalAnalytical Biochemistry
    Volume396
    Issue number2
    DOIs
    Publication statusPublished - 15 Jan 2010

    Keywords

    • Drug discovery
    • Screening
    • Pteridine reductase
    • Dihydrofolate reductase
    • PARASITE LEISHMANIA-MAJOR
    • BINDING INHIBITION CONSTANTS
    • THYMIDYLATE SYNTHASE
    • TRYPANOSOMA-BRUCEI
    • ENZYME-INHIBITORS
    • METHOTREXATE
    • METABOLISM
    • PTR1
    • GENE
    • REPLACEMENT

    Cite this

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    title = "Development and validation of a cytochrome c-coupled assay for pteridine reductase 1 and dihydrofolate reductase",
    abstract = "Activity of the pterin- and folate-salvaging enzymes pteridine reductase I (PTR1) and dihydrofolate reductase-thymidylate synthetase (DHFR-TS) is commonly measured as a decrease in absorbance at 340 nm, corresponding to oxidation of nicotinamide adenine dinucleotide phosphate (NADPH). Although this assay has been adequate to study the biology of these enzymes, it is not amenable to support any degree of routine inhibitor assessment because its restricted linearity is incompatible with enhanced throughput microtiter plate screening. In this article, we report the development and validation of a nonenzymatically coupled screening assay in which the product of the enzymatic reaction reduces cytochrome c, causing an increase in absorbance at 550 nm. We demonstrate this assay to be robust and accurate, and we describe its utility in supporting a structure-based design, small-molecule inhibitor campaign against Trypanosoma brucei PTR1 and DHFR-TS. (C) 2009 Elsevier Inc. All rights reserved.",
    keywords = "Drug discovery, Screening, Pteridine reductase, Dihydrofolate reductase, PARASITE LEISHMANIA-MAJOR, BINDING INHIBITION CONSTANTS, THYMIDYLATE SYNTHASE, TRYPANOSOMA-BRUCEI, ENZYME-INHIBITORS, METHOTREXATE, METABOLISM, PTR1, GENE, REPLACEMENT",
    author = "Shanks, {Emma J.} and Ong, {Han B.} and Robinson, {David A.} and Stephen Thompson and Natasha Sienkiewicz and Fairlamb, {Alan H.} and Frearson, {Julie A.}",
    year = "2010",
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    language = "English",
    volume = "396",
    pages = "194--203",
    journal = "Analytical Biochemistry",
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    Development and validation of a cytochrome c-coupled assay for pteridine reductase 1 and dihydrofolate reductase. / Shanks, Emma J.; Ong, Han B.; Robinson, David A.; Thompson, Stephen; Sienkiewicz, Natasha; Fairlamb, Alan H.; Frearson, Julie A.

    In: Analytical Biochemistry, Vol. 396, No. 2, 15.01.2010, p. 194-203.

    Research output: Contribution to journalArticle

    TY - JOUR

    T1 - Development and validation of a cytochrome c-coupled assay for pteridine reductase 1 and dihydrofolate reductase

    AU - Shanks, Emma J.

    AU - Ong, Han B.

    AU - Robinson, David A.

    AU - Thompson, Stephen

    AU - Sienkiewicz, Natasha

    AU - Fairlamb, Alan H.

    AU - Frearson, Julie A.

    PY - 2010/1/15

    Y1 - 2010/1/15

    N2 - Activity of the pterin- and folate-salvaging enzymes pteridine reductase I (PTR1) and dihydrofolate reductase-thymidylate synthetase (DHFR-TS) is commonly measured as a decrease in absorbance at 340 nm, corresponding to oxidation of nicotinamide adenine dinucleotide phosphate (NADPH). Although this assay has been adequate to study the biology of these enzymes, it is not amenable to support any degree of routine inhibitor assessment because its restricted linearity is incompatible with enhanced throughput microtiter plate screening. In this article, we report the development and validation of a nonenzymatically coupled screening assay in which the product of the enzymatic reaction reduces cytochrome c, causing an increase in absorbance at 550 nm. We demonstrate this assay to be robust and accurate, and we describe its utility in supporting a structure-based design, small-molecule inhibitor campaign against Trypanosoma brucei PTR1 and DHFR-TS. (C) 2009 Elsevier Inc. All rights reserved.

    AB - Activity of the pterin- and folate-salvaging enzymes pteridine reductase I (PTR1) and dihydrofolate reductase-thymidylate synthetase (DHFR-TS) is commonly measured as a decrease in absorbance at 340 nm, corresponding to oxidation of nicotinamide adenine dinucleotide phosphate (NADPH). Although this assay has been adequate to study the biology of these enzymes, it is not amenable to support any degree of routine inhibitor assessment because its restricted linearity is incompatible with enhanced throughput microtiter plate screening. In this article, we report the development and validation of a nonenzymatically coupled screening assay in which the product of the enzymatic reaction reduces cytochrome c, causing an increase in absorbance at 550 nm. We demonstrate this assay to be robust and accurate, and we describe its utility in supporting a structure-based design, small-molecule inhibitor campaign against Trypanosoma brucei PTR1 and DHFR-TS. (C) 2009 Elsevier Inc. All rights reserved.

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    KW - Dihydrofolate reductase

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    KW - BINDING INHIBITION CONSTANTS

    KW - THYMIDYLATE SYNTHASE

    KW - TRYPANOSOMA-BRUCEI

    KW - ENZYME-INHIBITORS

    KW - METHOTREXATE

    KW - METABOLISM

    KW - PTR1

    KW - GENE

    KW - REPLACEMENT

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    M3 - Article

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    JO - Analytical Biochemistry

    JF - Analytical Biochemistry

    SN - 0003-2697

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    ER -