Fluorescence polarization discriminates green fluorescent protein from interfering autofluorescence in a microplate assay for genotoxicity

Andrew W. Knight, Nicholas J. Goddard, Nicholas Billinton, Paul A. Cahill, Richard M. Walmsley

    Research output: Contribution to journalArticlepeer-review

    Abstract

    An unconventional use for the polarization optics, associated with a variety of commercially available fluorescence microplate readers, is reported. This novel application has allowed the discrimination of green fluorescent protein (GFP) fluorescence in genetically modified yeast cells from interfering autofluorescent species. The method exploits the unusually high fluorescence anisotropy of GFP compared to smaller fluorophores and autofluorescent species. The principle was successfully applied to resolve the induced GFP signal from that of autofluorescent test compounds, in an assay for genotoxic species. The use of fluorescence polarization enabled both proflavin and methapyrilene to be identified as genotoxic agents in the yeast assay. This would not have been possible using conventional fluorescence alone since these compounds were found to be intensely autofluorescent at the same wavelength as GFP and thus effectively mask the GFP signal. © 2002 Published by Elsevier Science B.V.
    Original languageEnglish
    Pages (from-to)165-177
    Number of pages12
    JournalJournal of Biochemical and Biophysical Methods
    Volume51
    Issue number2
    DOIs
    Publication statusPublished - 18 Apr 2002

    Keywords

    • Fluorescence polarization
    • Genotoxicity
    • Green fluorescent protein

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