Atg38 is required for autophagy-specific phosphatidylinositol 3-kinase complex integrity.

Atg38 is required for autophagy-specific phosphatidylinositol 3-kinase complex integrity.
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DOI:
10.1083/jcb.201304123
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发表时间:
2013-10-28
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Ohsumi Y
Ohsumi Y
中科院分区:
其他
文献类型:
--
作者:
Araki Y;Ku WC;Akioka M;May AI;Hayashi Y;Arisaka F;Ishihama Y;Ohsumi Y

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Atg 38在Vps 15-Vps 34和Atg 14-Vps 30亚复合物之间提供物理连接,以促进PI 3-激酶复合物I的形成。自噬是真核生物中蛋白质和细胞器在液泡/溶酶体内自我降解的保守过程。自噬的特征在于自噬体的形成,其中Vps 34衍生的磷脂酰肌醇3-磷酸(PI 3 P)是必需的。在酵母中,Vps 34形成两种不同的蛋白质复合物:复合物I,其在自噬中起作用,以及复合物II,其参与蛋白质分选到液泡中。在这里,我们确定和表征Atg 38作为复合物I的稳定相关亚基。在atg 38 Δ细胞中,自噬活性显著降低,PI 3-激酶复合物I解离成Vps 15-Vps 34和Atg 14-Vps 30亚复合物。我们发现Atg 38通过其N端与Atg 14和Vps 34发生物理相互作用。进一步的生物化学分析表明,Atg 38通过其C末端同源二聚化,并且这种同源二聚体的形成对于复合物I的完整性是必不可少的。这些数据表明,同源二聚体的Atg 38的功能作为一个物理连接之间的Vps 15-Vps 34和Atg 14-Vps 30亚复合物,以促进复合物I的形成。
Atg38 provides a physical linkage between the Vps15–Vps34 and Atg14–Vps30 subcomplexes to facilitate PI3-kinase complex I formation. Autophagy is a conserved eukaryotic process of protein and organelle self-degradation within the vacuole/lysosome. Autophagy is characterized by the formation of an autophagosome, for which Vps34-dervied phosphatidylinositol 3-phosphate (PI3P) is essential. In yeast, Vps34 forms two distinct protein complexes: complex I, which functions in autophagy, and complex II, which is involved in protein sorting to the vacuole. Here we identify and characterize Atg38 as a stably associated subunit of complex I. In atg38Δ cells, autophagic activity was significantly reduced and PI3-kinase complex I dissociated into the Vps15–Vps34 and Atg14–Vps30 subcomplexes. We find that Atg38 physically interacted with Atg14 and Vps34 via its N terminus. Further biochemical analyses revealed that Atg38 homodimerizes through its C terminus and that this homodimer formation is indispensable for the integrity of complex I. These data suggest that the homodimer of Atg38 functions as a physical linkage between the Vps15–Vps34 and Atg14–Vps30 subcomplexes to facilitate complex I formation.
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ATG32是一种线粒体蛋白,在线粒体过程中赋予了选择性。
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发表时间: 2009-07
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