Gingras, Alexandre R, Ziegler, Wolfgang H, Bobkov, Andrey A, Joyce, M Gordon, Fasci, Domenico, Himmel, Mirko, Rothemund, Sven, Ritter, Anett, Grossmann, J Guenter, Patel, Bipin et al (show 8 more authors)
(2009)
Structural Determinants of Integrin Binding to the Talin Rod
JOURNAL OF BIOLOGICAL CHEMISTRY, 284 (13).
pp. 8857-8867.
ISSN 0021-9258, 1083-351X
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Abstract
The adaptor protein talin serves both to activate the integrin family of cell adhesion molecules and to couple integrins to the actin cytoskeleton. Integrin activation has been shown to involve binding of the talin FERM domain to membrane proximal sequences in the cytoplasmic domain of the integrin α-subunit. However, a second integrin-binding site (IBS2) has been identified near the C-terminal end of the talin rod. Here we report the crystal structure of IBS2 (residues 1974-2293), which comprises two five-helix bundles, "IBS2-A" (1974-2139) and "IBS2-B" (2140-2293), connected by a continuous helix with a distinct kink at its center that is stabilized by side-chain H-bonding. Solution studies using small angle x-ray scattering and NMR point to a fairly flexible quaternary organization. Using pull-down and enzyme-linked immunosorbent assays, we demonstrate that integrin binding requires both IBS2 domains, as does binding to acidic phospholipids and robust targeting to focal adhesions. We have defined the membrane proximal region of the integrin cytoplasmic domain as the major binding region, although more membrane distal regions are also required for strong binding. Alanine-scanning mutagenesis points to an important electrostatic component to binding. Thermal unfolding experiments show that integrin binding induces conformational changes in the IBS2 module, which we speculate are linked to vinculin and membrane binding. © 2009 by The American Society for Biochemistry and Molecular Biology, Inc.
| Item Type: | Article |
|---|---|
| Additional Information: | ## TULIP Type: Articles/Papers (Journal) ## |
| Uncontrolled Keywords: | Cell Membrane, Cytoplasm, Animals, Mice, Talin, Vinculin, Integrins, Peptide Mapping, Crystallography, X-Ray, Binding Sites, Protein Structure, Tertiary, Protein Binding |
| Divisions: | Faculty of Health & Life Sciences Faculty of Health & Life Sciences > Inst. Systems, Molec & Integrative Biology > Inst. Systems, Molec & Integrative Biology |
| Depositing User: | Symplectic Admin |
| Date Deposited: | 13 Mar 2024 09:33 |
| Last Modified: | 16 Jun 2026 04:13 |
| DOI: | 10.1074/jbc.M805937200 |
| Related Websites: | |
| URI: | https://livrepository.liverpool.ac.uk/id/eprint/3179352 |
| Disclaimer: | The University of Liverpool is not responsible for content contained on other websites from links within repository metadata. Please contact us if you notice anything that appears incorrect or inappropriate. |
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