Kindlin-2 (Mig-2): a co-activator of beta3 integrins.

Kindlin-2 (Mig-2): a co-activator of beta3 integrins.
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DOI:
10.1083/jcb.200710196
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发表时间:
2008-05-05
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Plow EF
Plow EF
中科院分区:
其他
文献类型:
--
作者:
Ma YQ;Qin J;Wu C;Plow EF

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整合素激活对于动态连接细胞外环境和细胞骨架/信号网络至关重要。激活是由整合素的短细胞质尾部(CTs)控制的。目前普遍认为,talin- h的头部结构域可以通过结合整合素β CT中的两个位点介导整合素的激活;在整合素β3中,这是一个NPLY747基序和近端膜区。本研究表明,整合素β3 CT的c端区域由保守的TS752T区域和NITY759基序组成,通过结合细胞质结合伙伴kindlin-2(一种广泛分布的PTB结构域蛋白)支持整合素激活。kindlin-2与talin-H共转染可协同增强整合素α ib β3的活化。此外,内源性kindlin-2的siRNA敲低会损害talin诱导的αIIbβ3在转染CHO细胞中的激活,并减弱αvβ3介导的内皮细胞的粘附和迁移。因此,我们的研究结果确定kindlin-2是整合素激活的新调节剂;它起着辅激活剂的作用。
Integrin activation is essential for dynamically linking the extracellular environment and cytoskeletal/signaling networks. Activation is controlled by integrins' short cytoplasmic tails (CTs). It is widely accepted that the head domain of talin (talin-H) can mediate integrin activation by binding to two sites in integrin β's CT; in integrin β3 this is an NPLY747 motif and the membrane-proximal region. Here, we show that the C-terminal region of integrin β3 CT, composed of a conserved TS752T region and NITY759 motif, supports integrin activation by binding to a cytosolic binding partner, kindlin-2, a widely distributed PTB domain protein. Co-transfection of kindlin-2 with talin-H results in a synergistic enhancement of integrin αIIbβ3 activation. Furthermore, siRNA knockdown of endogenous kindlin-2 impairs talin-induced αIIbβ3 activation in transfected CHO cells and blunts αvβ3-mediated adhesion and migration of endothelial cells. Our results thus identify kindlin-2 as a novel regulator of integrin activation; it functions as a coactivator.
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