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Science 308 (5726): 1318-1321

Copyright © 2005 by the American Association for the Advancement of Science

Structural Bioinformatics-Based Design of Selective, Irreversible Kinase Inhibitors

Michael S. Cohen, Chao Zhang, Kevan M. Shokat, Jack Taunton*

Abstract: The active sites of 491 human protein kinase domains are highly conserved, which makes the design of selective inhibitors a formidable challenge. We used a structural bioinformatics approach to identify two selectivity filters, a threonine and a cysteine, at defined positions in the active site of p90 ribosomal protein S6 kinase (RSK). A fluoromethylketone inhibitor, designed to exploit both selectivity filters, potently and selectively inactivated RSK1 and RSK2 in mammalian cells. Kinases with only one selectivity filter were resistant to the inhibitor, yet they became sensitized after genetic introduction of the second selectivity filter. Thus, two amino acids that distinguish RSK from other protein kinases are sufficient to confer inhibitor sensitivity.

Program in Chemistry and Chemical Biology, and Department of Cellular and Molecular Pharmacology, University of California, San Francisco, CA 94143-2280, USA.

* To whom correspondence should be addressed. E-mail: taunton{at}cmp.ucsf.edu


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