FAK promotes recruitment of talin to nascent adhesions to control cell motility.

FAK promotes recruitment of talin to nascent adhesions to control cell motility.
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DOI:
10.1083/jcb.201108078
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发表时间:
2012-01-23
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Schlaepfer DD
Schlaepfer DD
中科院分区:
其他
文献类型:
--
作者:
Lawson C;Lim ST;Uryu S;Chen XL;Calderwood DA;Schlaepfer DD

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另一种联系表明,FAK使talin独立于talin与β1整合素的结合而形成新生的粘附。细胞迁移是一个动态过程,涉及基质-细胞粘附位点的持续形成、成熟和周转。新的(新生的)粘附在突出的细胞边缘以张力无关的方式形成,由整合素受体、信号传导和细胞骨架相关蛋白组成。整合素招募局灶黏附激酶(FAK)和细胞骨架蛋白talin参与新生黏附。规范模型支持talin在介导FAK定位和粘附激活中的作用。在这里,我们表明FAK促进talin募集到独立于talin与β1整合素结合的新生粘附。确定了talin在FAK上的直接结合位点,FAK的一个点突变(E1015A)阻止了talin与新生粘附的结合和定位,但没有改变整合素介导的FAK在粘附中的募集和激活。此外,FAK E1015A抑制细胞运动和有效粘附动力学所需的蛋白水解talin裂解。这些结果支持了FAK-talin相互作用在控制细胞迁移所必需的新生粘附中的另一种联系。
An alternative linkage is shown whereby FAK brings talin to nascent adhesions independent of talin binding to β1 integrins. Cell migration is a dynamic process that involves the continuous formation, maturation, and turnover of matrix–cell adhesion sites. New (nascent) adhesions form at the protruding cell edge in a tension-independent manner and are comprised of integrin receptors, signaling, and cytoskeletal-associated proteins. Integrins recruit focal adhesion kinase (FAK) and the cytoskeletal protein talin to nascent adhesions. Canonical models support a role for talin in mediating FAK localization and activation at adhesions. Here, alternatively, we show that FAK promotes talin recruitment to nascent adhesions occurring independently of talin binding to β1 integrins. The direct binding site for talin on FAK was identified, and a point mutation in FAK (E1015A) prevented talin association and talin localization to nascent adhesions but did not alter integrin-mediated FAK recruitment and activation at adhesions. Moreover, FAK E1015A inhibited cell motility and proteolytic talin cleavage needed for efficient adhesion dynamics. These results support an alternative linkage for FAK–talin interactions within nascent adhesions essential for the control of cell migration.
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