Talin activates integrins by altering the topology of the β transmembrane domain.

Talin activates integrins by altering the topology of the β transmembrane domain.
复制标题

DOI:
10.1083/jcb.201112141
复制
发表时间:
2012-05-28
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Ginsberg MH
Ginsberg MH
中科院分区:
其他
文献类型:
--
作者:
Kim C;Ye F;Hu X;Ginsberg MH

文献摘要

参考文献

被引文献

相似文献

Talin与整合素β尾部的结合改变了β跨膜区的拓扑结构,导致整合素激活。Talin与整合素β尾巴的结合增加了配体结合亲和力(激活)。β跨膜区(TMD)拓扑结构的改变破坏了α-β跨膜区的相互作用,从而介导了整合素的激活。在本论文中,我们使用内、外膜水界面膜包埋的整合素β-3TMD来监测塔林诱导的β-3TMD在模型膜中的运动。Talin与β3细胞质结构域的结合增加了β3 TMD内外边界的氨基酸侧链嵌入,表明β3 TMD的拓扑结构发生了变化。Talin影响这种变化的能力取决于它与整合素β尾巴和膜结合的能力。在β3TMD的中点引入柔性铰链可以使Talin诱导的TMD拓扑结构的改变与细胞外解偶联,并阻断Talin诱导的整合素αIIbβ3的激活。因此,我们表明Talin与整合素βTMD结合改变了TMD的拓扑结构,导致整合素激活。
Talin binding to the integrin β tail alters the β transmembrane domain’s topology, resulting in integrin activation. Talin binding to integrin β tails increases ligand binding affinity (activation). Changes in β transmembrane domain (TMD) topology that disrupt α–β TMD interactions are proposed to mediate integrin activation. In this paper, we used membrane-embedded integrin β3 TMDs bearing environmentally sensitive fluorophores at inner or outer membrane water interfaces to monitor talin-induced β3 TMD motion in model membranes. Talin binding to the β3 cytoplasmic domain increased amino acid side chain embedding at the inner and outer borders of the β3 TMD, indicating altered topology of the β3 TMD. Talin’s capacity to effect this change depended on its ability to bind to both the integrin β tail and the membrane. Introduction of a flexible hinge at the midpoint of the β3 TMD decoupled the talin-induced change in intracellular TMD topology from the extracellular side and blocked talin-induced activation of integrin αIIbβ3. Thus, we show that talin binding to the integrin β TMD alters the topology of the TMD, resulting in integrin activation.
DOI: 10.1021/bi800107a
发表时间: 2008-04-01
期刊: BIOCHEMISTRY
影响因子: 2.9
作者:
Lau, Tong-Lay;Partridge, Anthony W.;Ulmer, Tobias S.
通讯作者: Ulmer, Tobias S.
DOI: 10.1038/nature08144
发表时间: 2009-05-21
期刊: NATURE
影响因子: 64.8
作者:
Rosenbaum, Daniel M.;Rasmussen, Soren G. F.;Kobilka, Brian K.
通讯作者: Kobilka, Brian K.
DOI: 10.1038/nature10697
发表时间: 2011-12-18
期刊: NATURE
影响因子: 64.8
作者:
Kim, Chungho;Schmidt, Thomas;Cho, Eun-Gyung;Ye, Feng;Ulmer, Tobias S.;Ginsberg, Mark H.
通讯作者: Ginsberg, Mark H.
DOI: 10.1073/pnas.0409440102
发表时间: 2005-03-08
影响因子: 11.1
作者:
Luo, BH;Carman, CV;Springer, TA
通讯作者: Springer, TA
DOI: 10.3109/09537109609023579
发表时间: 1996-01-01
期刊: PLATELETS
影响因子: 3.3
作者:
GarciaGuerra, R;GarciaDominguez, JA;GonzalezRodriguez, J
通讯作者: GonzalezRodriguez, J