Mechanism of integrin activation by talin and its cooperation with kindlin

Fan Lu, Liang Zhu, Thomas Bromberger, Jun Yang, Qiannan Yang, Jianmin Liu, Edward F. Plow, Markus Moser () and Jun Qin ()
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Fan Lu: Lerner Research Institute, Cleveland Clinic
Liang Zhu: Lerner Research Institute, Cleveland Clinic
Thomas Bromberger: Technische Universität München
Jun Yang: Lerner Research Institute, Cleveland Clinic
Qiannan Yang: Lerner Research Institute, Cleveland Clinic
Jianmin Liu: Lerner Research Institute, Cleveland Clinic
Edward F. Plow: Lerner Research Institute, Cleveland Clinic
Markus Moser: Technische Universität München
Jun Qin: Lerner Research Institute, Cleveland Clinic

Nature Communications, 2022, vol. 13, issue 1, 1-19

Abstract: Abstract Talin-induced integrin binding to extracellular matrix ligands (integrin activation) is the key step to trigger many fundamental cellular processes including cell adhesion, cell migration, and spreading. Talin is widely known to use its N-terminal head domain (talin-H) to bind and activate integrin, but how talin-H operates in the context of full-length talin and its surrounding remains unknown. Here we show that while being capable of inducing integrin activation, talin-H alone exhibits unexpectedly low potency versus a constitutively activated full-length talin. We find that the large C-terminal rod domain of talin (talin-R), which otherwise masks the integrin binding site on talin-H in inactive talin, dramatically enhances the talin-H potency by dimerizing activated talin and bridging it to the integrin co-activator kindlin-2 via the adaptor protein paxillin. These data provide crucial insight into the mechanism of talin and its cooperation with kindlin to promote potent integrin activation, cell adhesion, and signaling.

Date: 2022
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DOI: 10.1038/s41467-022-30117-w

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