Structural analysis of the transitional state of Arp2/3 complex activation by two actin-bound WCAs.
Structural analysis of the transitional state of Arp2/3 complex activation by two actin-bound WCAs.
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DOI:
10.1038/ncomms4308
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发表时间:
2014
影响因子:
16.6
通讯作者:
Dominguez, Roberto
中科院分区:
文献类型:
--
作者:
Boczkowska, Malgorzata;Rebowski, Grzegorz;Kast, David J.;Dominguez, Roberto
Actin filament nucleation and branching by Arp2/3 complex is activated by nucleation-promoting factors (NPFs), whose C-terminal WCA region contains binding sites for actin (W) and Arp2/3 complex (CA). It is debated whether one or two NPFs are required for activation. Here, we present conclusive evidence in support of the two-NPF model and show that actin plays a crucial role in the interactions of two mammalian NPFs, N-WASP and WAVE2, with Arp2/3 complex. Competition between actin-WCA and glia maturation factor (GMF) for binding to Arp2/3 complex suggests that during activation the first actin monomer binds at the barbed end of Arp2. Based on distance constrains obtained by time-resolved fluorescence resonance energy transfer, we define the relative position of the two actin-WCAs on Arp2/3 complex and propose an atomic model of the 11-subunit transitional complex.
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