Inter-domain dynamics in the chaperone SurA and multi-site binding to its outer membrane protein clients.
Antonio N CalabreseBob SchiffrinMatthew WatsonTheodoros K KaramanosMartin WalkoJulia R HumesJim E HornePaul WhiteAndrew J WilsonAntreas C KalliRoman TumaAlison E AshcroftDavid J BrockwellSheena E RadfordPublished in: Nature communications (2020)
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.
Keyphrases
- single molecule
- molecular dynamics simulations
- crystal structure
- mass spectrometry
- living cells
- endoplasmic reticulum
- atomic force microscopy
- heat shock protein
- molecular docking
- escherichia coli
- high resolution
- heat shock
- molecular dynamics
- dna binding
- binding protein
- high throughput
- liquid chromatography
- hiv infected
- human immunodeficiency virus
- endoplasmic reticulum stress
- fluorescent probe
- single cell
- high speed