Structural basis for recruitment and activation of the AP-1 clathrin adaptor complex by Arf1.

Structural basis for recruitment and activation of the AP-1 clathrin adaptor complex by Arf1.
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DOI:
10.1016/j.cell.2012.12.042
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发表时间:
2013-02-14
期刊:
影响因子:
64.5
通讯作者:
Hurley JH
Hurley JH
中科院分区:
生物学1区
文献类型:
--
作者:
Ren X;Farías GG;Canagarajah BJ;Bonifacino JS;Hurley JH

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AP-1是一种网状蛋白适配器复合体,负责在跨高尔基体网络和内小体之间对货物进行分类。AP-1招募到这些隔间需要Arf1-GTP。AP-1与Arf1-GTP四聚体核心的晶体结构和生化分析表明,Arf1通过解锁AP-1激活了货物结合。解锁是由Arf1的两个分子驱动的,它们连接了AP-1在两个相互作用位点的两个拷贝。ARF1的GTP依赖的开关I和II区域与一个AP-1复合体的β1亚基的N端结合,而ARF1的背面与第二个AP-1复合体的γ亚单位干的中央部分结合。γ亚单位N-末端附近的第三个Arf1相互作用位点对招募很重要,但不是激活。这些观察结果导致了一个由Arf1招募和激活AP-1的模型。
AP-1 is a clathrin adaptor complex that sorts cargo between the trans-Golgi network and endosomes. AP-1 recruitment to these compartments requires Arf1-GTP. The crystal structure of the tetrameric core of AP-1 in complex with Arf1-GTP, together with biochemical analyses, shows that Arf1 activates cargo binding by unlocking AP-1. Unlocking is driven by two molecules of Arf1 that bridge two copies of AP-1 at two interaction sites. The GTP-dependent switch I and II regions of Arf1 bind to the N-terminus of the β1 subunit of one AP-1 complex, while the back side of Arf1 binds to the central part of the γ subunit trunk of a second AP-1 complex. A third Arf1 interaction site near the N-terminus of the γ subunit is important for recruitment, but not activation. These observations lead to a model for the recruitment and activation of AP-1 by Arf1.
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