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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 how it binds its OMP clients and the mechanism(s) of its chaperone action remain unclear. Here, we have used chemical cross-linking, hydrogen-deuterium exchange, single-molecule FRET and molecular dynamics simulations to map the client binding site(s) on SurA and to interrogate the role of conformationaldoi:10.1101/2019.12.19.882696 fatcat:bg43fqqupbhulfeg32r53a45vi