Download MendeleyStructural basis for inhibition of the cyclin-dependent kinase Cdk6 by the tumour suppressor p16INK4a.
Russo, A.A., Tong, L., Lee, J.O., Jeffrey, P.D., Pavletich, N.P.(1998) Nature 395: 237-243
- PubMed: 9751050
- DOI: https://doi.org/10.1038/26155
- Primary Citation of Related Structures:
1BI7, 1BI8 - PubMed Abstract:
The cyclin-dependent kinases 4 and 6 (Cdk4/6) that control the G1 phase of the cell cycle and their inhibitor, the p16INK4a tumour suppressor, have a central role in cell proliferation and in tumorigenesis. The structures of Cdk6 bound to p16INK4a and to the related p19INK4d reveal that the INK4 inhibitors bind next to the ATP-binding site of the catalytic cleft, opposite where the activating cyclin subunit binds. They prevent cyclin binding indirectly by causing structural changes that propagate to the cyclin-binding site. The INK4 inhibitors also distort the kinase catalytic cleft and interfere with ATP binding, which explains how they can inhibit the preassembled Cdk4/6-cyclin D complexes as well. Tumour-derived mutations in INK4a and Cdk4 map to interface contacts, solidifying the role of CDK binding and inhibition in the tumour suppressor activity of p16INK4a.
Organizational Affiliation:
Cellular Biochemistry and Biophysics Program, Memorial Sloan-Kettering Cancer Center, New York, New York 10021, USA.
