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Talin and kindlin use integrin tail allostery and direct binding to activate integrins.
Nat. Struct. Mol. Biol. 30, 1913-1924 (2023)
Integrin affinity regulation, also termed integrin activation, is essential for metazoan life. Although talin and kindlin binding to the β-integrin cytoplasmic tail is indispensable for integrin activation, it is unknown how they achieve this function. By combining NMR, biochemistry and cell biology techniques, we found that talin and kindlin binding to the β-tail can induce a conformational change that increases talin affinity and decreases kindlin affinity toward it. We also discovered that this asymmetric affinity regulation is accompanied by a direct interaction between talin and kindlin, which promotes simultaneous binding of talin and kindlin to β-tails. Disrupting allosteric communication between the β-tail-binding sites of talin and kindlin or their direct interaction in cells severely compromised integrin functions. These data show how talin and kindlin cooperate to generate a small but critical population of ternary talin-β-integrin-kindlin complexes with high talin-integrin affinity and high dynamics.
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Publikationstyp
Artikel: Journalartikel
Dokumenttyp
Wissenschaftlicher Artikel
Schlagwörter
Structural Basis; Adhesion Measurements; Domain; Complexes; Reveals
ISSN (print) / ISBN
1545-9993
e-ISSN
1545-9985
Zeitschrift
Nature Structural & Molecular Biology
Quellenangaben
Band: 30,
Heft: 12,
Seiten: 1913-1924
Verlag
Nature Publishing Group
Verlagsort
New York, NY
Nichtpatentliteratur
Publikationen
Begutachtungsstatus
Peer reviewed
Institut(e)
Institute of Structural Biology (STB)
Förderungen
Max Planck Society
Swiss National Science Foundation
DFG
European Research Council
Swiss National Science Foundation
DFG
European Research Council