A solid phase assay for topoisomerase I interfacial poisons and catalytic inhibitors

    Authors

    V. Cyril;M. T. Muller

    Comments

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    Abbreviated Journal Title

    Anal. Biochem.

    Keywords

    Eukaryotic topoisomerase I; High-throughput screening; DNA binding; proteins; Solid phase assays; Anticancer compounds; DNA TOPOISOMERASES; ACTINOMYCIN-D; MECHANISM; CLEAVAGE; COMPLEXES; TAMOXIFEN; TARGETS; ROLES; Biochemical Research Methods; Biochemistry & Molecular Biology; Chemistry, Analytical

    Abstract

    We report a mechanism-based screening technique to rapidly identify eukaryotic topoisomerase I targeting agents. The method is based on genetic tagging of topoisomerase I to immobilize the enzyme on a solid surface in a microtiter well format. DNA is added to the wells, and retained DNA is detected by Pico Green fluorescence. Compounds that result in an increase in Pico Green staining represent potential topoisomerase interfacial poisons, whereas those that reduce fluorescence report catalytic inhibitors; therefore, the solid phase assay represents a "bimodal" readout that reveals mechanisms of action. The method has been demonstrated to work with known interfacial poisons and catalytic inhibitors. This method is rapid, robust, economical, and scalable for large library screens. (C) 2011 Elsevier Inc. All rights reserved.

    Journal Title

    Analytical Biochemistry

    Volume

    421

    Issue/Number

    2

    Publication Date

    1-1-2012

    Document Type

    Article

    Language

    English

    First Page

    607

    Last Page

    616

    WOS Identifier

    WOS:000300528400033

    ISSN

    0003-2697

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