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Structure of the Atg101-Atg13 complex reveals essential roles of Atg101 in autophagy initiation.

Suzuki H, Kaizuka T, Mizushima N, Noda NN
Nat Struct Mol Biol 22 572-80 (2015)
Cited: 57 times
EuropePMC logo PMID: 26030876

Abstract

Atg101 is an essential component of the autophagy-initiating ULK complex in higher eukaryotes, but it is absent from the functionally equivalent Atg1 complex in budding yeast. Here, we report the crystal structure of the fission yeast Atg101-Atg13 complex. Atg101 has a Hop1, Rev7 and Mad2 (HORMA) architecture similar to that of Atg13. Mad2 HORMA has two distinct conformations (O-Mad2 and C-Mad2), and, intriguingly, Atg101 resembles O-Mad2 rather than the C-Mad2-like Atg13. Atg13 HORMA from higher eukaryotes possesses an inherently unstable fold, which is stabilized by Atg101 via interactions analogous to those between O-Mad2 and C-Mad2. Mutational studies revealed that Atg101 is responsible for recruiting downstream factors to the autophagosome-formation site in mammals via a newly identified WF finger. These data define the molecular functions of Atg101, providing a basis for elucidating the molecular mechanisms of mammalian autophagy initiation by the ULK complex.

Reviews - 4yk8 mentioned but not cited (1)

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