Structures of staurosporine bound to CDK2 and cAPK--new tools for structure-based design of protein kinase inhibitors.

Protein kinases are involved in a wide variety of signal transduction processes; their deregulation has been implicated in a number of human diseases, including cancer and disorders of the immune system. The recently determined structures of two protein kinases, cAPK and CDK2, in complex with an inhibitor, staurosporine, provide a detailed account of inhibitor-kinase interactions and inhibitor selectivity.