CYK4 inhibits Rac1-dependent PAK1 and ARHGEF7 effector pathways during cytokinesis.

CYK4 inhibits Rac1-dependent PAK1 and ARHGEF7 effector pathways during cytokinesis.
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DOI:
10.1083/jcb.201204107
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发表时间:
2012-09-03
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Barr FA
Barr FA
中科院分区:
其他
文献类型:
--
作者:
Bastos RN;Penate X;Bates M;Hammond D;Barr FA

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CYK4作为gtpase激活蛋白的活性在后期抑制与细胞扩散和粘附控制相关的rac1依赖性效应通路是必需的。在有丝分裂过程中,动物细胞失去了与周围表面的附着力,变成圆形。在有丝分裂结束时,它们重新建立这些粘连,同时物理地收缩和分裂。这些相互竞争的过程是如何在空间上在细胞皮层分离的仍然是个谜。为了解决这个问题,我们定义了RhoA和Rac1在有丝分裂细胞中使用的特定效应途径。我们证明了MKlp1-CYK4中心纺锤蛋白复合物是Rac1而不是RhoA的鸟苷三磷酸酶激活蛋白(GAP),并且CYK4在细胞后期负向调节Rac1在细胞赤道的活性。表达CYK4 GAP突变体的细胞在细胞质分裂中存在缺陷,并且细胞粘附标志物vinculin染色升高。这些缺陷可以通过消耗ARHGEF7和p21活化激酶(细胞粘附所需的rac1特异性效应蛋白)来修复。基于这些发现,我们提出CYK4 GAP活性是后期抑制与细胞扩散和粘附控制相关的rac1依赖性效应通路所必需的。
CYK4 activity as a GTPase-activating protein is required during anaphase to inhibit Rac1-dependent effector pathways associated with control of cell spreading and adhesion. In mitosis, animal cells lose their adhesion to the surrounding surfaces and become rounded. During mitotic exit, they reestablish these adhesions and at the same time physically contract and divide. How these competing processes are spatially segregated at the cell cortex remains mysterious. To address this question, we define the specific effector pathways used by RhoA and Rac1 in mitotic cells. We demonstrate that the MKlp1–CYK4 centralspindlin complex is a guanosine triphosphatase–activating protein (GAP) for Rac1 and not RhoA and that CYK4 negatively regulated Rac1 activity at the cell equator in anaphase. Cells expressing a CYK4 GAP mutant had defects in cytokinesis and showed elevated staining for the cell adhesion marker vinculin. These defects could be rescued by depletion of ARHGEF7 and p21-activated kinase, Rac1-specific effector proteins required for cell adhesion. Based on these findings, we propose that CYK4 GAP activity is required during anaphase to inhibit Rac1-dependent effector pathways associated with control of cell spreading and adhesion.
CYK-4:中央纺锤体形成和细胞因子所需的RHO家族GTPase激活蛋白(GAP)。
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