Download MendeleyBipartite binding of the N terminus of Skp2 to cyclin A.
Kelso, S., Orlicky, S., Beenstock, J., Ceccarelli, D.F., Kurinov, I., Gish, G., Sicheri, F.(2021) Structure 29: 975
- PubMed: 33989513
- DOI: https://doi.org/10.1016/j.str.2021.04.011
- Primary Citation of Related Structures:
7LUO - PubMed Abstract:
Skp2 and cyclin A are cell-cycle regulators that control the activity of CDK2. Cyclin A acts as an activator and substrate recruitment factor of CDK2, while Skp2 mediates the ubiquitination and subsequent destruction of the CDK inhibitor protein p27. The N terminus of Skp2 can interact directly with cyclin A but is not required for p27 ubiquitination. To gain insight into this poorly understood interaction, we have solved the 3.2 Å X-ray crystal structure of the N terminus of Skp2 bound to cyclin A. The structure reveals a bipartite mode of interaction with two motifs in Skp2 recognizing two discrete surfaces on cyclin A. The uncovered binding mechanism allows for a rationalization of the inhibitory effect of Skp2 on CDK2-cyclin A kinase activity toward the RxL motif containing substrates and raises the possibility that other intermolecular regulators and substrates may use similar non-canonical modes of interaction for cyclin targeting.
Organizational Affiliation:
Lunenfeld-Tanenbaum Research Institute, Sinai Health System, Toronto, ON M5G 1X5, Canada; Department of Molecular Genetics, University of Toronto, ON M5S 1A8, Canada.
