Solution structure of the Atg1 complex: implications for the architecture of the phagophore assembly site.
Solution structure of the Atg1 complex: implications for the architecture of the phagophore assembly site.
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DOI:
10.1016/j.str.2015.02.012
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发表时间:
2015-05-05
期刊:
影响因子:
5.7
通讯作者:
Hurley, James H.
中科院分区:
文献类型:
--
作者:
Koefinger, Juergen;Ragusa, Michael J.;Lee, Il-Hyung;Hummer, Gerhard;Hurley, James H.
The biogenesis of autophagosomes commences at the phagophore assembly site (PAS), a protein-vesicle ultrastructure that is organized by the Atg1 complex. The Atg1 complex consists of the Atg1 protein kinase, the intrinsically disordered region-rich Atg13, and the dimeric double crescent-shaped Atg17-Atg31-Atg29 subcomplex. We show that the PAS contains a relatively uniform ~28 copies of Atg17, and upon autophagy induction, similar numbers of Atg1 and Atg13 molecules. We then apply ensemble refinement of small angle x-ray scattering (SAXS) to determine the solution structures of the Atg1-Atg13 and Atg17-Atg31-Atg29 subcomplexes and the Atg1 complex, using a trimmed “mini-pentamer” tractable to biophysical studies. We observe tetramers of Atg1 pentamers that assemble via Atg17-Atg31-Atg29. This leads to a model for the higher organization of the Atg1 complex in PAS scaffolding.
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