Structural characterization of the Saccharomyces cerevisiae autophagy regulatory complex Atg17-Atg31-Atg29.

Structural characterization of the Saccharomyces cerevisiae autophagy regulatory complex Atg17-Atg31-Atg29.
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DOI:
10.4161/auto.25687
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发表时间:
2013-10
期刊:
影响因子:
13.3
通讯作者:
Yip CK
Yip CK
中科院分区:
生物学1区
文献类型:
--
作者:
Chew LH;Setiaputra D;Klionsky DJ;Yip CK

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Atg 17与Atg 29和Atg 31形成复合物,构成了Atg 1激酶信号复合物的关键模块,并作为酵母Saccharomyces cerevisiae中噬菌体组装位点的重要组织者发挥功能。我们已经确定了完整S的三维重建。通过单粒子电子显微镜观察酿酒酵母Atg 17-Atg 31-Atg 29复合物。我们的结构表明,Atg 17-Atg 31-Atg 29是二聚体,并采用相对刚性和延伸的“S形”结构,端到端距离约为345 nm。亚基定位分析表明,Atg 17介导二聚化,并产生一个中央棒状支架,而Atg 31和Atg 29形成两个球状结构域,拴系到支架的凹侧的终端区域。最后,我们观察到Atg 17在缺乏Atg 31和Atg 29的情况下采用多种构象,这表明这两个较小的组分在定义和维持三元复合物的独特曲率方面起着关键作用。
Atg17, in complex with Atg29 and Atg31, constitutes a key module of the Atg1 kinase signaling complex and functions as an important organizer of the phagophore assembly site in the yeast Saccharomyces cerevisiae. We have determined the three-dimensional reconstruction of the full S. cerevisiae Atg17-Atg31-Atg29 complex by single-particle electron microscopy. Our structure shows that Atg17-Atg31-Atg29 is dimeric and adopts a relatively rigid and extended “S-shape” architecture with an end-to-end distance of approximately 345 Å. Subunit mapping analysis indicated that Atg17 mediates dimerization and generates a central rod-like scaffold, while Atg31 and Atg29 form two globular domains that are tethered to the concave sides of the scaffold at the terminal regions. Finally, our observation that Atg17 adopts multiple conformations in the absence of Atg31 and Atg29 suggests that the two smaller components play key roles in defining and maintaining the distinct curvature of the ternary complex.
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