Exo70 stimulates the Arp2/3 complex for lamellipodia formation and directional cell migration.
Exo70 stimulates the Arp2/3 complex for lamellipodia formation and directional cell migration.
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DOI:
10.1016/j.cub.2012.05.055
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发表时间:
2012-08-21
期刊:
影响因子:
9.2
通讯作者:
Guo, Wei
中科院分区:
文献类型:
--
作者:
Liu, Jianglan;Zhao, Yuting;Sun, Yujie;He, Bing;Yang, Changsong;Svitkina, Tatyana;Goldman, Yale E.;Guo, Wei
Directional cell migration requires the coordination of actin assembly and membrane remodeling. The exocyst is an octameric protein complex essential for exocytosis and plasma membrane remodeling. A component of the exocyst, Exo70, directly interacts with the Arp2/3 complex, a core nucleating factor for the generation of branched actin networks for cell morphogenesis and migration. Using in vitro actin polymerization assay and time-lapse TIRF microscopy, we found Exo70 functions as a kinetic activator of the Arp2/3 complex that promotes actin filament nucleation and branching. We further found that the effect of Exo70 on actin is mediated by promoting the interaction of Arp2/3 complex with WAVE2, a member of the N-WASP/WAVE family of nucleation promoting factors (NPFs). At the cellular level, the stimulatory effect of Exo70 on Arp2/3 is required for lamellipodia formation and maintaining directional persistence of cell migration. Our findings provide a novel mechanism for regulating actin polymerization and branching for effective membrane protrusion during cell morphogenesis and migration.
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