Interactions between the L1 cell adhesion molecule and ezrin support traction-force generation and can be regulated by tyrosine phosphorylation.

Interactions between the L1 cell adhesion molecule and ezrin support traction-force generation and can be regulated by tyrosine phosphorylation.
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L1 细胞粘附分子和埃兹蛋白之间的相互作用支持牵引力的产生,并且可以通过酪氨酸磷酸化来调节。

DOI:
10.1002/jnr.21705
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发表时间:
2008-09
影响因子:
4.2
通讯作者:
Felsenfeld, Dan P.
Felsenfeld, Dan P.
中科院分区:
医学3区
文献类型:
--
作者:
Sakurai, Takeshi;Gil, Orlando D.;Whittard, John D.;Gazdoiu, Mihaela;Joseph, Todd;Wu, James;Waksman, Adam;Benson, Deanna L.;Salton, Stephen R.;Felsenfeld, Dan P.

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IG超家族细胞粘附分子L1在细胞膜上形成粘附复合物,该粘附复合物含有信号分子和细胞骨架蛋白。这种复合物介导细胞外信号的转导,并产生肌动蛋白介导的牵引力,两者都支持轴突生长。L1细胞质区域结合ezrin,一种与肌动蛋白细胞骨架相互作用的衔接蛋白。在这项研究中,我们详细分析了L1-ezrin相互作用,评估了它们在L1产生牵引力中的作用,并确定了控制ezrin-L1相互作用的潜在调控机制。通过酵母双杂交相互作用陷阱和体外蛋白结合分析,证实了埃兹蛋白的FERM结构域与L1的质膜区域结合。L1(K1147 L)的该结构域中的赖氨酸至亮氨酸取代显示与埃兹蛋白FERM结构域的结合减少。此外,在ND 7细胞中,K1147 L突变抑制L1在细胞表面上的逆行运动,这与轴突生长所需的牵引力的产生有关。由L1的质膜区域组成的膜渗透性肽可以破坏内源性L1-ezrin相互作用,抑制小脑细胞在L1底物上的神经突延伸。此外,L1-ezrin相互作用可以通过L1胞质区域,即Y1151的酪氨酸磷酸化来调节,可能是通过Src家族激酶。用天冬氨酸或苯丙氨酸替换酪氨酸与Y1176一起改变ezrin结合,并改变ND 7细胞中与ezrin的共定位。总的来说,这些数据表明,L1-ezrin的相互作用介导的L1质膜区域参与牵引力的产生,并可以通过磷酸化的L1调节。
An Ig superfamily cell-adhesion molecule, L1, forms an adhesion complex at the cell membrane containing both signaling molecules and cytoskeletal proteins. This complex mediates the transduction of extracellular signals and generates actin-mediated traction forces, both of which support axon outgrowth. The L1 cytoplasmic region binds ezrin, an adapter protein that interacts with the actin cytoskeleton. In this study, we analyzed L1–ezrin interactions in detail, assessed their role in generating traction forces by L1, and identified potential regulatory mechanisms controlling ezrin–L1 interactions. The FERM domain of ezrin binds to the juxtamembrane region of L1, demonstrated by yeast two-hybrid interaction traps and protein binding analyses in vitro. A lysine-to-leucine substitution in this domain of L1 (K1147L) shows reduced binding to the ezrin FERM domain. Additionally, in ND7 cells, the K1147L mutation inhibits retrograde movement of L1 on the cell surface that has been linked to the generation of the traction forces necessary for axon growth. A membrane-permeable peptide consisting of the juxtamembrane region of L1 that can disrupt endogenous L1–ezrin interactions inhibits neurite extension of cerebellar cells on L1 substrates. Moreover, the L1–ezrin interactions can be modulated by tyrosine phosphorylation of the L1 cytoplasmic region, namely, Y1151, possibly through Src-family kinases. Replacement of this tyrosine together with Y1176 with either aspartate or phenylalanine changes ezrin binding and alters colocalization with ezrin in ND7 cells. Collectively, these data suggest that L1–ezrin interactions mediated by the L1 juxtamembrane region are involved in traction-force generation and can be regulated by the phosphorylation of L1.
DOI: 10.1016/s0092-8674(00)81856-5
发表时间: 1997-01-10
期刊: CELL
影响因子: 64.5
作者:
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DOI: 10.1038/12021
发表时间: 1999-08-01
影响因子: 21.3
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磷酸肌醇的结合和磷酸化在ezrin的激活机理中依次起作用。
DOI: 10.1083/jcb.200307032
发表时间: 2004-03-01
影响因子: 7.8
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DOI: 10.1083/jcb.137.3.703
发表时间: 1997-05-05
期刊: The Journal of cell biology
影响因子: --
作者:
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