Abstract
The crystal structure of the cyclin D-dependent kinase Cdk6 bound to the p19INK4d protein has been determined at 1.9 Å resolution. The results provide the first structural information for a cyclin D-dependent protein kinase and show how the INK4 family of CDK inhibitors bind. The structure indicates that the conformational changes induced by p19INK4d inhibit both productive binding of ATP and the cyclin-induced rearrangement of the kinase from an inactive to an active conformation. The structure also shows how binding of an INK4 inhibitor would prevent binding of p27Kip1, resulting in its redistribution to other CDKs. Identification of the critical residues involved in the interaction explains how mutations in Cdk4 and p16INK4a result in loss of kinase inhibition and cancer.
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Acknowledgements
We thank C. J. Sherr (Howard Hughes Medical Institute) for the plasmid expressing GST–p19INK4d; A. Raine for computer programming; M. Nilges for X-PLOR scripts; I. Tickle for advice; F. Luh for the selectively protonated p19INK4d; J. Eckstein for help with molecular graphics; and E. Duke, W. Burmeister and R. C. Kehoe for help with data collection. This work was supported by grants from the BBSRC and the Wellcome Trust. D.H.B. is supported by a studentship from the MRC. M.S. is supported by a grant from DGICYT, Spain, and by a core grant to the Department of Immunology and Oncology from Pharmacia-Upjohn and the Spanish Research Council. The Cambridge Centre for Molecular Recognition is supported by the BBSRC and the Wellcome Trust.
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Brotherton, D., Dhanaraj, V., Wick, S. et al. Crystal structure of the complex of the cyclin D-dependent kinase Cdk6 bound to the cell-cycle inhibitor p19INK4d. Nature 395, 244–250 (1998). https://doi.org/10.1038/26164
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DOI: https://doi.org/10.1038/26164
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