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Molecular mechanism of SurA’s chaperoning function to outer membrane proteins revealed by purification-after-crosslinking single-molecule FRET

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Abstract

SurA is the major chaperone of outer membrane proteins (OMPs) in the periplasm. The molecular mechanism when SurA performs its chaperoning function is still unclear. Here, a purification-after-crosslinking (PAC) procedure was combined with single-molecule fluorescence resonance energy transfer (smFRET) to probe the conformations of SurA and OmpC in their complex. We found that SurA in the free state rearranges itself based on the crystal structure, except that the P2 domain moves towards the core domain with two major positions, forming a clamp-like conformation to accommodate OmpC. The obvious rearrangement of the P2 domain of SurA helps SurA to hold OmpC. OmpC attaches to SurA randomly and has the propensity to be near the middle part of the crevice. The noncollapsed and disordered conformations of OMPs provided by the OMPs·SurA complex are important to the subsequent delivery and folding process.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (21233002, 21521003) and the National Key Basic Research Special Foundation of China (2012CB917304). The measurements of CD spectra were performed at the Analytical Instrumentation Center of Peking University (PKUAIC). We acknowledge the assistance of Dr. Jiang Zhou from PKUAIC.

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Authors and Affiliations

  1. School of Life Sciences, Peking University, Beijing, 100871, China

    Chenhui He

  2. Biomedical Pioneering Innovation Center (BIOPIC), Peking University, Beijing, 100871, China

    Chenhui He, Sichen Pan, Geng Li & Xin Sheng Zhao

  3. Beijing National Laboratory for Molecular Sciences, State Key Laboratory for Structural Chemistry of Unstable and Stable Species, and Department of Chemical Biology, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China

    Sichen Pan, Geng Li & Xin Sheng Zhao

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  1. Chenhui He
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  2. Sichen Pan
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  3. Geng Li
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  4. Xin Sheng Zhao
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Correspondence to Xin Sheng Zhao.

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11426_2020_9758_MOESM1_ESM.pdf

Molecular Mechanism of SurA’s Chaperoning Function to Outer Membrane Proteins Revealed by Purification-after-Crosslinking Single-Molecule FRET

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He, C., Pan, S., Li, G. et al. Molecular mechanism of SurA’s chaperoning function to outer membrane proteins revealed by purification-after-crosslinking single-molecule FRET. Sci. China Chem. 63, 1142–1152 (2020). https://doi.org/10.1007/s11426-020-9758-2

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  • DOI: https://doi.org/10.1007/s11426-020-9758-2

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