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

Angew Chem Int Ed Engl

The Michael Barber Centre for Collaborative Mass Spectrometry, The School of Chemistry, Manchester Institute for Biotechnology, University of Manchester, Manchester, UK.

Published: March 2019

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.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7122115PMC
http://dx.doi.org/10.1002/anie.201812697DOI Listing

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