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Instruments / Technical Area	Publication Details	Published	Actions
B21-High Throughput SAXS I04-1-Macromolecular Crystallography (fixed wavelength)	Discriminative SKP2 interactions with CDK-cyclin complexes support a cyclin a-specific role in p27KIP1 degradation Marco Salamina , Bailey C. Montefiore , Mengxi Liu , Daniel J. Wood , Richard Heath , James R. Ault , Lan-Zhen Wang , Svitlana Korolchuk , Arnaud Basle , Martyna Pastok , Judith Reeks , Natalie J. Tatum , Frank Sobott , Stefan T. Arold , Michele Pagano , Martin E. M. Noble , Jane A. Endicott Journal Of Molecular Biology 433 DOI: 10.1016/j.jmb.2020.166795 Diamond Proposal Number(s): [13587, 16970] Open Access Show Abstract ▼ Abstract: The SCFSKP2 ubiquitin ligase relieves G1 checkpoint control of CDK-cyclin complexes by promoting p27KIP1 degradation. We describe reconstitution of stable complexes containing SKP1-SKP2 and CDK1-cyclin B or CDK2-cyclin A/E, mediated by the CDK regulatory subunit CKS1. We further show that a direct interaction between a SKP2 N-terminal motif and cyclin A can stabilize SKP1-SKP2-CDK2-cyclin A complexes in the absence of CKS1. We identify the SKP2 binding site on cyclin A and demonstrate the site is not present in cyclin B or cyclin E. This site is distinct from but overlapping with features that mediate binding of p27KIP1 and other G1 cyclin regulators to cyclin A. We propose that the capacity of SKP2 to engage with CDK2-cyclin A by more than one structural mechanism provides a way to fine tune the degradation of p27KIP1 and distinguishes cyclin A from other G1 cyclins to ensure orderly cell cycle progression.	Mar 2021

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