Structure of the human ATG12~ATG5 conjugate required for LC3 lipidation in autophagy.

Structure of the human ATG12~ATG5 conjugate required for LC3 lipidation in autophagy.
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DOI:
10.1038/nsmb.2431
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发表时间:
2013-01
影响因子:
16.8
通讯作者:
Otomo, Takanori
Otomo, Takanori
中科院分区:
生物学1区
文献类型:
--
作者:
Otomo, Chinatsu;Metlagel, Zoltan;Takaesu, Giichi;Otomo, Takanori

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自噬因子ATG 12 ~ ATG 5缀合物表现出E3连接酶样活性,通过该活性促进LC 3家族成员的脂化。人ATG 12 ~ ATG 5偶联物的晶体结构与ATG 16 L1的氨基末端区域结合,ATG 16 L1是将偶联物募集到自噬体膜的因子,揭示了一种整合的结构,其中ATG 12通过保守残基对接到ATG 5上。ATG 12和ATG 5的取向使得每个分子上的其他保守残基(包括缀合连接)形成连续的补丁。突变数据支持ATG 12-ATG 5界面和连续补丁对E3活性的重要性。ATG 12 ~ ATG 5结合物通过ATG 12独有的另一个表面位置与E2酶ATG 3以高亲和力相互作用,表明连续补丁在E3活性中的不同作用。这些发现为了解LC 3脂化的机制提供了基础。
The autophagy factor ATG12~ATG5 conjugate exhibits E3 ligase-like activity by which the lipidation of members of the LC3 family is facilitated. The crystal structure of the human ATG12~ATG5 conjugate bound to the amino-terminal region of ATG16L1, the factor that recruits the conjugate to autophagosomal membranes, reveals an integrated architecture in which ATG12 docks onto ATG5 through conserved residues. ATG12 and ATG5 are oriented such that other conserved residues on each molecule, including the conjugation junction, form a continuous patch. Mutagenesis data support the importance of both the ATG12–ATG5 interface and the continuous patch for E3 activity. The ATG12~ATG5 conjugate interacts with the E2 enzyme ATG3 with high-affinity through another surface location that is exclusive to ATG12, suggesting a different role of the continuous patch in E3 activity. These findings provide a foundation for understanding the mechanism of LC3 lipidation.
DOI: 10.1083/jcb.152.4.657
发表时间: 2001-02-19
期刊: The Journal of cell biology
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