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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

A time-resolved fluorescence resonance energy transfer-based HTS assay and a surface plasmon resonance-based binding assay for heat shock protein 90 inhibitors.

Heat shock protein 90 ( Hsp90) is an ATP-dependent molecular chaperone required for the stability and function of a number of client proteins, many of which are involved in cancer development. The natural products geldanamycin (GM) and radicicol (RD) are known inhibitors of Hsp90, and their derivatives are being developed for the treatment of various cancers. To identify novel Hsp90 inhibitors, a highly robust time-resolved fluorescence resonance energy transfer (TR-FRET)-based HTS assay that measures the binding of biotinylated geldanamycin (biotin-GM) to the His-tagged human Hsp90 N-terminal ATP-binding domain (Hsp90N) was developed. This assay was optimized in 1536-well plates and was used as the primary assay to screen 10(6) compounds. Identified "hits" were then confirmed in a scintillation proximity assay (SPA) and a DEAE membrane-based assay for [(3)H]AAG binding to Hsp90. In addition, a surface plasmon resonance (SPR) assay that measures the direct interaction of Hsp90 with its inhibitors was developed and used to further characterize the identified inhibitors. Several potent and reversible inhibitors of human Hsp90 with K(d) values measured in the high nanomolar range were identified.[1]


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