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

AN. Calabrese, B. Schiffrin, M. Watson, TK. Karamanos, M. Walko, JR. Humes, JE. Horne, P. White, AJ. Wilson, AC. Kalli, R. Tuma, AE. Ashcroft, DJ. Brockwell, SE. Radford,

. 2020 ; 11 (1) : 2155. [pub] 20200501

Jazyk angličtina Země Velká Británie

Typ dokumentu časopisecké články, Research Support, N.I.H., Extramural, práce podpořená grantem

Perzistentní odkaz   https://www.medvik.cz/link/bmc20025053

Grantová podpora
BB/P000037/1 Biotechnology and Biological Sciences Research Council - United Kingdom
BB/N007603/1 Biotechnology and Biological Sciences Research Council - United Kingdom
BB/T000635/1 Biotechnology and Biological Sciences Research Council - United Kingdom
BB/N017307/1 Biotechnology and Biological Sciences Research Council - United Kingdom
BB/M011151/1 Biotechnology and Biological Sciences Research Council - United Kingdom
BB/M012573/1 Biotechnology and Biological Sciences Research Council - United Kingdom
MR/P018491/1 Medical Research Council - United Kingdom
105615/Z/14/Z Wellcome Trust - United Kingdom
208385/Z/17/Z Wellcome Trust - United Kingdom

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.

Citace poskytuje Crossref.org

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