Radiometric filter binding assays are acknowledged for their ability to identify and confirm lead compounds in drug discovery. They can be limited in their utility due to throughput, cost, and amenability to automation. Data obtained using a new 384 well filter plate demonstrate that automated quantitative and screening assays can be developed that are equivalent to assays run in a 96-well format.

Using the Muscarinic M1 G-protein Coupled Receptor as a model system, we achieved accurate and reproducible determinations of binding affinity (Kd) and IC50 results for known ligands on the 384-well plate device.

As a result of being able to incubate the reaction mixture in the filter plate and configure the assay using half the reaction volume, significant reductions in reagent costs and radioactive waste were achieved. Use of the fully-automated 384 filter plate makes it possible to develop higher throughput, lower cost radiometric receptor binding assays.

Authors: Gertrud Beterams, Steven Sheridan, Sonia Gil and Libby Kellard

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