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黏着斑激酶促进胎球蛋白向新生黏着斑的募集,从而控制细胞迁移。

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

机构信息

University of California San Diego, Moores Cancer Center, Department of Reproductive Medicine, La Jolla, CA 92093, USA.

出版信息

J Cell Biol. 2012 Jan 23;196(2):223-32. doi: 10.1083/jcb.201108078.

Abstract

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.

摘要

细胞迁移是一个动态过程,涉及基质-细胞黏附位点的不断形成、成熟和更新。新的(新生)黏附在细胞突出边缘以一种不依赖张力的方式形成,由整合素受体、信号和细胞骨架相关蛋白组成。整合素招募粘着斑激酶(FAK)和细胞骨架蛋白塔林到新生黏附。经典模型支持塔林在黏附处介导 FAK 定位和激活中的作用。在这里,相反,我们表明 FAK 促进塔林向新生黏附的招募,而不依赖于塔林与β1 整合素的结合。FAK 上与塔林结合的直接结合位点被鉴定出来,FAK 中的一个点突变(E1015A)阻止了塔林的结合和塔林向新生黏附的定位,但没有改变整合素介导的 FAK 在黏附处的募集和激活。此外,FAK E1015A 抑制了细胞迁移和蛋白水解塔林切割,这对于有效的黏附动力学是必需的。这些结果支持了在新生黏附处 FAK-塔林相互作用的替代连接,这对于控制细胞迁移是必不可少的。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b7d5/3265949/ecf852b14a04/JCB_201108078_Fig1.jpg

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