Tyrosine phosphorylation of Rac1: a role in regulation of cell spreading.

Tyrosine phosphorylation of Rac1: a role in regulation of cell spreading.
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DOI:
10.1371/journal.pone.0028587
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发表时间:
2011
期刊:
影响因子:
3.7
通讯作者:
Romer L
Romer L
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Chang F;Lemmon C;Lietha D;Eck M;Romer L

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Rac1 影响多种重要的细胞和组织水平控制功能,使其成为靶向治疗的重要候选者。 Rho 家族成员 Cdc42 的活性已被证明受 64 位酪氨酸磷酸化的调节。因此,我们研究了 Rac1 中点突变 Y64F 和 Y64D 的后果。在野生型、组成型活性或显性失活 Rac1 表达的情况下,这两种突变都改变了细胞从基线的扩散,并且伴随着 Rac1 靶向粘着斑的差异。与野生型 Rac1 相比,Rac1-Y64F 显示出 GTP 结合增加、与 βPIX 的关联增加以及与 RhoGDI 的结合减少。 Rac1-Y64D 与 PAK 的结合少于 Rac1-WT 或 Rac1-64F。体外测定表明 Rac1 中的 Y64 是 FAK 和 Src 的靶标。总而言之,这些数据表明非受体酪氨酸激酶调节 Rac1 活性的机制,并对膜延伸产生影响。
Rac1 influences a multiplicity of vital cellular- and tissue-level control functions, making it an important candidate for targeted therapeutics. The activity of the Rho family member Cdc42 has been shown to be modulated by tyrosine phosphorylation at position 64. We therefore investigated consequences of the point mutations Y64F and Y64D in Rac1. Both mutations altered cell spreading from baseline in the settings of wild type, constitutively active, or dominant negative Rac1 expression, and were accompanied by differences in Rac1 targeting to focal adhesions. Rac1-Y64F displayed increased GTP-binding, increased association with βPIX, and reduced binding with RhoGDI as compared with wild type Rac1. Rac1-Y64D had less binding to PAK than Rac1-WT or Rac1-64F. In vitro assays demonstrated that Y64 in Rac1 is a target for FAK and Src. Taken together, these data suggest a mechanism for the regulation of Rac1 activity by non-receptor tyrosine kinases, with consequences for membrane extension.
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