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© Thomas Wollert
Publication : PLoS biology

Atg11 tethers Atg9 vesicles to initiate selective autophagy

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in PLoS biology - 29 Jul 2019

Matscheko N, Mayrhofer P, Rao Y, Beier V, Wollert T

Link to Pubmed [PMID] – 31356628

PLoS Biol. 2019 Jul;17(7):e3000377

Autophagy recycles cytoplasmic components by sequestering them in double membrane-surrounded autophagosomes. The two proteins Atg11 and Atg17 are scaffolding components of the Atg1 kinase complex. Atg17 recruits and tethers Atg9-donor vesicles, and the corresponding Atg1 kinase complex induces the formation of nonselective autophagosomes. Atg11 initiates selective autophagy and coordinates the switch to nonselective autophagy by recruiting Atg17. The molecular function of Atg11 remained, however, less well understood. Here, we demonstrate that Atg11 is activated by cargo through a direct interaction with autophagy receptors. Activated Atg11 dimerizes and tethers Atg9 vesicles, which leads to the nucleation of phagophores in direct vicinity of cargo. Starvation reciprocally regulates the activity of both tethering factors by initiating the degradation of Atg11 while Atg17 is activated. This allows Atg17 to sequester and tether Atg9 vesicles independent of cargo to nucleate nonselective phagophores. Our data reveal insights into the molecular mechanisms governing cargo selection and specificity in autophagy.

https://www.ncbi.nlm.nih.gov/pubmed/31356628