Inter-domain dynamics in the chaperone SurA and multi-site binding to its outer membrane protein clients

Antonio N. Calabrese, Bob Schiffrin, Matthew Watson, Theodoros K. Karamanos, Martin Walko, Julia R. Humes, Jim E. Horne, Paul White, Andrew J. Wilson, Antreas C. Kalli, Roman Tuma, Alison E. Ashcroft, David J. Brockwell and Sheena E. Radford ()
Additional contact information
Antonio N. Calabrese: University of Leeds
Bob Schiffrin: University of Leeds
Matthew Watson: University of Leeds
Theodoros K. Karamanos: University of Leeds
Martin Walko: University of Leeds
Julia R. Humes: University of Leeds
Jim E. Horne: University of Leeds
Paul White: University of Leeds
Andrew J. Wilson: University of Leeds
Antreas C. Kalli: University of Leeds
Roman Tuma: University of Leeds
Alison E. Ashcroft: University of Leeds
David J. Brockwell: University of Leeds
Sheena E. Radford: University of Leeds

Nature Communications, 2020, vol. 11, issue 1, 1-16

Abstract: Abstract The periplasmic chaperone SurA plays a key role in outer membrane protein (OMP) biogenesis. E. coli SurA comprises a core domain and two peptidylprolyl isomerase domains (P1 and P2), but its mechanisms of client binding and chaperone function have remained unclear. Here, we use chemical cross-linking, hydrogen-deuterium exchange mass spectrometry, single-molecule FRET and molecular dynamics simulations to map the client binding site(s) on SurA and interrogate the role of conformational dynamics in OMP recognition. We demonstrate that SurA samples an array of conformations in solution in which P2 primarily lies closer to the core/P1 domains than suggested in the SurA crystal structure. OMP binding sites are located primarily in the core domain, and OMP binding results in conformational changes between the core/P1 domains. Together, the results suggest that unfolded OMP substrates bind in a cradle formed between the SurA domains, with structural flexibility between domains assisting OMP recognition, binding and release.

Date: 2020
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DOI: 10.1038/s41467-020-15702-1

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