Redundant canonical and noncanonical Caenorhabditis elegans p21-activated kinase signaling governs distal tip cell migrations.

Redundant canonical and noncanonical Caenorhabditis elegans p21-activated kinase signaling governs distal tip cell migrations.
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DOI:
10.1534/g3.112.004416
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发表时间:
2013-02
期刊:
G3 (Bethesda, Md.)
影响因子:
--
通讯作者:
Reiner DJ
Reiner DJ
中科院分区:
其他
文献类型:
--
作者:
Peters EC;Gossett AJ;Goldstein B;Der CJ;Reiner DJ

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p21激活激酶(Paks)是Rac/Cdc 42依赖性和非依赖性信号传导的重要介质,并调节信号转导和基于细胞间隙的细胞运动。我们使用的可重复迁移的秀丽隐杆线虫性腺远端细胞表明,两个三个线虫Pak蛋白,MAX-2和PAK-1,功能冗余的调节细胞迁移,但调节非常不同的机制。首先,我们认为MAX-2需要CED-10/Rac功能,因此功能规范。其次,PIX-1和GIT-1的功能与PAK-1相同,PAK-1与PIX-1的相互作用是PAK-1活性所必需的;因此,PAK-1的功能是非规范的。人类Pak-Pix-Git复合物是非经典Pak信号传导的核心,并且仅需要适度的Rac/CDC-42输入。与人类复合体不同,我们的研究结果表明,C。elegans Pak-Pix-Git复合物需要PAK-1激酶结构域活性。这项研究描绘了信号网络的关系,在这个细胞迁移模型,从而提供了潜在的进一步机制的见解和评估总Pak细胞迁移事件的贡献。
p21-activated kinases (Paks) are prominent mediators of Rac/Cdc42-dependent and -independent signaling and regulate signal transduction and cytoskeletal-based cell movements. We used the reproducible migrations of the Caenorhabditis elegans gonadal distal tip cells to show that two of the three nematode Pak proteins, MAX-2 and PAK-1, function redundantly in regulation of cell migration but are regulated by very different mechanisms. First, we suggest that MAX-2 requires CED-10/Rac function and thus functions canonically. Second, PIX-1 and GIT-1 function in the same role as PAK-1, and PAK-1 interaction with PIX-1 is required for PAK-1 activity; thus, PAK-1 functions noncanonically. The human Pak-Pix-Git complex is central to noncanonical Pak signaling and requires only modest Rac/CDC-42 input. Unlike the human complex, our results suggest that the C. elegans Pak-Pix-Git complex requires PAK-1 kinase domain activity. This study delineates signaling network relationships in this cell migration model, thus providing potential further mechanistic insights and an assessment of total Pak contribution to cell migration events.
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