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Journal of Biomolecular Screening
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Simple Absorbance-Based Assays for Ultra-High Throughput Screening

Patrick Lavery

Molecular Interactions and New Assay Technologies, SmithKline Beecham Pharmaceuticals, New Frontiers Science Park, Essex, UK

Murray J.B. Brown

Molecular Interactions and New Assay Technologies, SmithKline Beecham Pharmaceuticals, New Frontiers Science Park, Essex, UK

Andrew J. Pope

Molecular Interactions and New Assay Technologies, SmithKline Beecham Pharmaceuticals, New Frontiers Science Park, Essex, UK

In order to accommodate the predicted increase in screening required of successful pharmaceutical companies, miniaturized, high-speed HTS formats are necessary. Much emphasis has been placed on sensitive fluorescence techniques, but some systems, particularly enzymes interconverting small substrates, are likely to be refractory to such approaches. We show here that simple absorbance-based assays can be miniaturized to 10-,.d volumes in 1536- well microplates compatible with the requirements for ultra-high throughput screening. We demonstrate that, with low-cost hardware, assay performance is wholly predictable from the 2-fold decrease in pathlength for fully filled 1536-well plates compared to 96- and 384-well microplates. A number of enzyme systems are shown to work in this high-density format, and the inhibition parameters determined are comparable with those in standard assay formats. We also demonstrate the utility of kinetics measurements in miniaturized format with improvements in assay quality and the ability to extract detailed mechanistic information about inhibitors.

Journal of Biomolecular Screening, Vol. 6, No. 1, 3-9 (2001)
DOI: 10.1177/108705710100600102
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