The regulation of cyclin-dependent kinase inhibitors (CKIs).

Inhibitors of cyclin-dependent kinases (CKIs) play key roles in coordinating cell proliferation and development. They also function to control critical cell cycle transitions and as effectors of checkpoint pathways. The activity of CKIs is tightly controlled through the cell cycle and in response to various signals. Regulation generally affects the levels or availability of the CKIs rather than changing their intrinsic activities. Mechanisms controlling CKI function include the regulation of transcription, translation and proteolysis. In addition some signals appear to induce sequestration of CKIs within the cells, thereby changing their ability to interact with specific targets.