An ECT2-centralspindlin complex regulates the localization and function of RhoA

被引:366
作者
Yüce, Ö [1 ]
Piekny, A [1 ]
Glotzer, M [1 ]
机构
[1] Res Inst Mol Pathol, A-1030 Vienna, Austria
关键词
D O I
10.1083/jcb.200501097
中图分类号
Q2 [细胞生物学];
学科分类号
071009 ; 090102 ;
摘要
anaphase, the spindle dictates the site of contractile ring assembly. Assembly and ingression of the contractile ring involves activation of myosin-II and actin polymerization, which are triggered by the GTPase RhoA. In many cells, the central spindle affects division plane positioning via unknown molecular mechanisms. Here, we dissect furrow formation in human cells and show that the RhoGEF ECT2 is required for cortical localization of RhoA and contractile ring assembly. ECT2 concentrates on the central spindle by binding to centralspindlin. Depletion of the centralspindlin component I MKLP1 prevents central spindle localization of ECT2; however, RhoA, F-actin, and myosin still accumulate on the equatorial cell cortex. Depletion of the other centralspindlin component, CYK-4/MgcRacGAP, prevents cortical accumulation of RhoA, F-actin, and myosin. CYK-4 and ECT2 interact, and this interaction is cell cycle regulated via ECT2 phosphorylation. Thus, central spindle localization of ECT2 assists division plane positioning and the CYK-4 subunit of centralspindlin acts upstream of RhoA to promote furrow assembly.
引用
收藏
页码:571 / 582
页数:12
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