Dia1 and IQGAP1 interact in cell migration and phagocytic cup formation.

Dia1 and IQGAP1 interact in cell migration and phagocytic cup formation.
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DIA1和IQGAP1在细胞迁移和吞噬杯形成中相互作用。

DOI:
10.1083/jcb.200612071
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发表时间:
2007-07-16
影响因子:
7.8
通讯作者:
Grosse, Robert
Grosse, Robert
中科院分区:
生物学1区
文献类型:
--
作者:
Brandt, Dominique T.;Marion, Sabrina;Griffiths, Gareth;Watanabe, Takashi;Kaibuchi, Kozo;Grosse, Robert

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与透明相关的成蛋白Dia1使肌动蛋白聚合,从而调节细胞形状和运动性。控制Dia1在细胞内位置以空间上限定肌动蛋白聚合的机制在很大程度上是未知的。在这项研究中,我们确定细胞骨架支架蛋白IQGAP1是一种与Dia1结合的蛋白,对其亚细胞定位是必需的。在RhoA介导的Dia1自身抑制解除后,IQGAP1通过透明抑制结构域内的一个区域与Dia1相互作用。这两种蛋白共定位在迁移细胞的前端,也定位在巨噬细胞中富含肌动蛋白的吞噬杯中。我们表明IQGAP1与Dia1的相互作用对于吞噬作用和吞噬杯的形成是必需的。因此,我们确定IQGAP1是通过介导肌动蛋白丝成核蛋白Dia1的定位而参与调节吞噬作用的一种新成分。
The Diaphanous-related formin Dia1 nucleates actin polymerization, thereby regulating cell shape and motility. Mechanisms that control the cellular location of Dia1 to spatially define actin polymerization are largely unknown. In this study, we identify the cytoskeletal scaffold protein IQGAP1 as a Dia1-binding protein that is necessary for its subcellular location. IQGAP1 interacts with Dia1 through a region within the Diaphanous inhibitory domain after the RhoA-mediated release of Dia1 autoinhibition. Both proteins colocalize at the front of migrating cells but also at the actin-rich phagocytic cup in macrophages. We show that IQGAP1 interaction with Dia1 is required for phagocytosis and phagocytic cup formation. Thus, we identify IQGAP1 as a novel component involved in the regulation of phagocytosis by mediating the localization of the actin filament nucleator Dia1.
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影响因子: 64.5
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