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Force interacts with macromolecular structure in activation of TGF-β

Journal Article · · Nature (London)
DOI:https://doi.org/10.1038/nature21035· OSTI ID:1357645
Integrins are adhesion receptors that transmit force across the plasma membrane between extracellular ligands and the actin cytoskeleton. In activation of the transforming growth factor-β1 precursor (pro-TGF-β1), integrins bind to the prodomain, apply force, and release the TGF-β growth factor. However, we know little about how integrins bind macromolecular ligands in the extracellular matrix or transmit force to them. Here we show how integrin αVβ6 binds pro-TGF-β1 in an orientation biologically relevant for force-dependent release of TGF-β from latency. The conformation of the prodomain integrin-binding motif differs in the presence and absence of integrin binding; differences extend well outside the interface and illustrate how integrins can remodel extracellular matrix. Remodelled residues outside the interface stabilize the integrin-bound conformation, adopt a conformation similar to earlier-evolving family members, and show how macromolecular components outside the binding motif contribute to integrin recognition. Regions in and outside the highly interdigitated interface stabilize a specific integrin/pro-TGF-β orientation that defines the pathway through these macromolecules which actin-cytoskeleton-generated tensile force takes when applied through the integrin β-subunit. Simulations of force-dependent activation of TGF-β demonstrate evolutionary specializations for force application through the TGF-β prodomain and through the β- and not α-subunit of the integrin.
Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
National Institutes of Health (NIH); Charles A. King Trust Postdoctoral Research Fellowship Program, Bank of America, N.A., Co-Trustee
OSTI ID:
1357645
Journal Information:
Nature (London), Journal Name: Nature (London) Journal Issue: 7639 Vol. 542; ISSN 0028-0836
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
ENGLISH

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Integrin αVβ6-EGFR crosstalk regulates bidirectional force transmission and controls breast cancer invasion posted_content September 2018
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BMPR2 acts as a gatekeeper to protect endothelial cells from increased TGFβ responses and altered cell mechanics text January 2020

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