Direction of actin flow dictates integrin LFA-1 orientation during leukocyte migration

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Direction of actin flow dictates integrin LFA-1 orientation during leukocyte migration

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Title: Direction of actin flow dictates integrin LFA-1 orientation during leukocyte migration
Author: Nordenfelt, Pontus; Moore, Travis I.; Mehta, Shalin B.; Kalappurakkal, Joseph Mathew; Swaminathan, Vinay; Koga, Nobuyasu; Lambert, Talley J.; Baker, David; Waters, Jennifer C.; Oldenbourg, Rudolf; Tani, Tomomi; Mayor, Satyajit; Waterman, Clare M.; Springer, Timothy A.

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Citation: Nordenfelt, P., T. I. Moore, S. B. Mehta, J. M. Kalappurakkal, V. Swaminathan, N. Koga, T. J. Lambert, et al. 2017. “Direction of actin flow dictates integrin LFA-1 orientation during leukocyte migration.” Nature Communications 8 (1): 2047. doi:10.1038/s41467-017-01848-y. http://dx.doi.org/10.1038/s41467-017-01848-y.
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Abstract: Integrin αβ heterodimer cell surface receptors mediate adhesive interactions that provide traction for cell migration. Here, we test whether the integrin, when engaged to an extracellular ligand and the cytoskeleton, adopts a specific orientation dictated by the direction of actin flow on the surface of migrating cells. We insert GFP into the rigid, ligand-binding head of the integrin, model with Rosetta the orientation of GFP and its transition dipole relative to the integrin head, and measure orientation with fluorescence polarization microscopy. Cytoskeleton and ligand-bound integrins orient in the same direction as retrograde actin flow with their cytoskeleton-binding β-subunits tilted by applied force. The measurements demonstrate that intracellular forces can orient cell surface integrins and support a molecular model of integrin activation by cytoskeletal force. Our results place atomic, Å-scale structures of cell surface receptors in the context of functional and cellular, μm-scale measurements.
Published Version: doi:10.1038/s41467-017-01848-y
Other Sources: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5725580/pdf/
Terms of Use: This article is made available under the terms and conditions applicable to Other Posted Material, as set forth at http://nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of-use#LAA
Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:34651830
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