4P1N image
Deposition Date 2014-02-27
Release Date 2014-05-07
Last Version Date 2023-12-27
Entry Detail
PDB ID:
4P1N
Title:
Crystal structure of Atg1-Atg13 complex
Biological Source:
Source Organism:
Host Organism:
Method Details:
Experimental Method:
Resolution:
2.20 Å
R-Value Free:
0.25
R-Value Work:
0.20
R-Value Observed:
0.21
Space Group:
P 1 21 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Atg1 tMIT
Chain IDs:A, B
Chain Length:275
Number of Molecules:2
Biological Source:Kluyveromyces marxianus
Polymer Type:polypeptide(L)
Molecule:Atg13 MIM
Chain IDs:C, D
Chain Length:61
Number of Molecules:2
Biological Source:Kluyveromyces marxianus
Primary Citation
Structural basis of starvation-induced assembly of the autophagy initiation complex.
Nat.Struct.Mol.Biol. 21 513 521 (2014)
PMID: 24793651 DOI: 10.1038/nsmb.2822

Abstact

Assembly of the preautophagosomal structure (PAS) is essential for autophagy initiation in yeast. Starvation-induced dephosphorylation of Atg13 is required for the formation of the Atg1-Atg13-Atg17-Atg29-Atg31 complex (Atg1 complex), a prerequisite for PAS assembly. However, molecular details underlying these events have not been established. Here we studied the interactions of yeast Atg13 with Atg1 and Atg17 by X-ray crystallography. Atg13 binds tandem microtubule interacting and transport domains in Atg1, using an elongated helix-loop-helix region. Atg13 also binds Atg17, using a short region, thereby bridging Atg1 and Atg17 and leading to Atg1-complex formation. Dephosphorylation of specific serines in Atg13 enhanced its interaction with not only Atg1 but also Atg17. These observations update the autophagy-initiation model as follows: upon starvation, dephosphorylated Atg13 binds both Atg1 and Atg17, and this promotes PAS assembly and autophagy progression.

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