Ion Mobility Mass Spectrometry Measures the Conformational Landscape of p27 and its Domains and how this is Modulated upon Interaction with Cdk2/cyclin A

Rebecca Beveridge, Lukasz G. Migas, Richard W. Kriwacki, Perdita E. Barran

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    Abstract

    Intrinsically disordered proteins have been reported to undergo disorder‐to‐order transitions upon binding to their partners in the cell. The extent of the ordering upon binding and the lack of order prior to binding is difficult to visualize with classical structure determination methods. Binding of p27 to the Cdk2/cyclin A complex is accompanied by partial folding of p27 in the KID domain, with the retention of dynamic behavior for function, particularly in the C‐terminal half of the protein. Herein, native ion mobility mass spectrometry (IM‐MS) is employed to measure the intrinsic dynamic properties of p27, both in isolation and within the trimeric complex with Cdk2/cyclin A. The trimeric Cdk2/cyclin A/p27‐KID complex possesses significant structural heterogeneity compared to Cdk2/cyclin A. These findings support the formation of a fuzzy complex in which both the N‐ and C‐termini of p27 interact with Cdk2/cyclin A in multiple, closely associated states.
    Original languageEnglish
    Pages (from-to)3114-3118
    Number of pages5
    JournalAngewandte Chemie International Edition
    Volume58
    Issue number10
    Early online date20 Dec 2018
    DOIs
    Publication statusPublished - 2018

    Keywords

    • intrinsically disordered proteins
    • ion mobility mass spectrometry
    • protein structure

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