Ion Mobility Mass Spectrometry Measures the Conformational Landscape of p27 and its Domains and how this is Modulated upon Interaction with Cdk2/cyclin A. Issue 10 (24th January 2019)

• Record Type: Journal Article
• Authors: Beveridge, Rebecca; Migas, Lukasz G.; Kriwacki, Richard W.; Barran, Perdita E.
• Is Part Of: Angewandte Chemie international edition. Volume 58:Issue 10(2019)
• Page Start: 3114
• Page End: 3118
• Publication Date: 2019-01-24
• Subjects: intrinsically disordered proteins -- ion mobility mass spectrometry -- protein structure; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.201812697
• Languages: English
• ISSNs: 1433-7851

Abstract

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. Abstract : Order to disorder : Ion mobility mass spectrometry is employed to measure the intrinsic dynamic properties of p27, both in isolation and within the complex with Cdk2/cyclin A, and its individual domains. The 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 states.