Myosin II activity regulates vinculin recruitment to focal adhesions through FAK-mediated paxillin phosphorylation.

Myosin II activity regulates vinculin recruitment to focal adhesions through FAK-mediated paxillin phosphorylation.
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DOI:
10.1083/jcb.200906012
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发表时间:
2010-03-22
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Waterman CM
Waterman CM
中科院分区:
其他
文献类型:
--
作者:
Pasapera AM;Schneider IC;Rericha E;Schlaepfer DD;Waterman CM

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FAK-mediated myosin-dependent paxillin phosphorylation is necessary to bring vinculin to maturing focal adhesions, reinforcing the link between the cytoskeleton and the ECM. Focal adhesions (FAs) are mechanosensitive adhesion and signaling complexes that grow and change composition in response to myosin II–mediated cytoskeletal tension in a process known as FA maturation. To understand tension-mediated FA maturation, we sought to identify proteins that are recruited to FAs in a myosin II–dependent manner and to examine the mechanism for their myosin II–sensitive FA association. We find that FA recruitment of both the cytoskeletal adapter protein vinculin and the tyrosine kinase FA kinase (FAK) are myosin II and extracellular matrix (ECM) stiffness dependent. Myosin II activity promotes FAK/Src-mediated phosphorylation of paxillin on tyrosines 31 and 118 and vinculin association with paxillin. We show that phosphomimic mutations of paxillin can specifically induce the recruitment of vinculin to adhesions independent of myosin II activity. These results reveal an important role for paxillin in adhesion mechanosensing via myosin II–mediated FAK phosphorylation of paxillin that promotes vinculin FA recruitment to reinforce the cytoskeletal ECM linkage and drive FA maturation.
鉴定细胞骨架蛋白质体蛋白中的塔林结合位点。
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