Abstract
Control of NF-κB release through the inhibition of I & κB kinase β (IKKβ) has been identified as a potential target for the treatment of inflammatory and autoimmune diseases. To screen the small molecule compound library against IKKβ, a high throughput screening (HTS) campaign was carried out using immobilized metal affinity for phosphochemicals (IMAP)-based time-resolved fluorescence resonance energy transfer (TR-FRET) assay. Through serial optimization of assay conditions, the Z value was achieved at 0.88 from the pilot library screening of the most diverse 7,243 compounds with reconfirmation rate of 63%. The results from this HTS campaign identified three novel scaffolds for the prospective IKKβ inhibitor, such as 7-benzoyl-4-phenylcyclopenta [1,2] oxazine, 1-(thiophen or furan)-2,3- dihydroimidazo[1,5] pyridine and 2-phenyloxazolo [5,4] pyridine. Particularly, 7-benzoyl-4-phenylcyclopenta [1,2] oxazine derivatives presented potent inhibitory activity and selectivity for IKKβ. These findings suggest that the current TR-FRET assay system for IKKβ was successful to identify hits for novel IKKβ inhibitors as a robust, reproducible and sensitive HTS system.
Keywords: IκB kinase β, IKKβ inhibitor, time-resolved fluorescence resonance energy transfer.
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