Abstract
Annexins are abundant cytoplasmic proteins that can bind to negatively charged phospholipids in a Ca2+-dependent manner, and are known to play a role in the storage of Ca2+ and membrane healing. Little is known, however, about the dynamic processes of protein–Ca2+–membrane assembly and disassembly. Here we show that high-speed atomic force microscopy (HS-AFM) can be used to repeatedly induce and disrupt annexin assemblies and study their structure, dynamics and interactions. Our HS-AFM set-up is adapted for such biological applications through the integration of a pumping system for buffer exchange and a pulsed laser system for uncaging caged compounds. We find that biochemically identical annexins (annexin V) display different effective Ca2+ and membrane affinities depending on the assembly location, providing a wide Ca2+ buffering regime while maintaining membrane stabilization. We also show that annexin is membrane-recruited and forms stable supramolecular assemblies within ∼5 s in conditions that are comparable to a membrane lesion in a cell. Molecular dynamics simulations provide atomic detail of the role played by Ca2+ in the reversible binding of annexin to the membrane surface.
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Acknowledgements
The authors thank H. Haigler for sharing insights in annexin biophysics and structural biology and for valuable comments on the manuscript, and A. Karner for assistance with the setting up of the fluid exchange system. This work was funded by the ANR grants ANR-Nano (ANR-12-BS10-009-01) and ANR-BBMS (ANR-12-BSV8-0006-01) and a European Research Council (ERC) Grant (No. 310080). The GENCI and CINES, Montpellier, France, are acknowledged for the provision of computer time.
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S.S., A.M and C.C conceived and designed the experiments. A.M., C.C. and M.R. performed the experiments. S.S., C.C and A.M analysed the data. S.S., C.C and A.M wrote the paper.
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Miyagi, A., Chipot, C., Rangl, M. et al. High-speed atomic force microscopy shows that annexin V stabilizes membranes on the second timescale. Nature Nanotech 11, 783–790 (2016). https://doi.org/10.1038/nnano.2016.89
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DOI: https://doi.org/10.1038/nnano.2016.89
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