The Atg1-kinase complex tethers Atg9-vesicles to initiate autophagy.

Abstract:

:Autophagosomes are double-membrane vesicles that sequester cytoplasmic material for lysosomal degradation. Their biogenesis is initiated by recruitment of Atg9-vesicles to the phagophore assembly site. This process depends on the regulated activation of the Atg1-kinase complex. However, the underlying molecular mechanism remains unclear. Here we reconstitute this early step in autophagy from purified components in vitro. We find that on assembly from its cytoplasmic subcomplexes, the Atg1-kinase complex becomes activated, enabling it to recruit and tether Atg9-vesicles. The scaffolding protein Atg17 targets the Atg1-kinase complex to autophagic membranes by specifically recognizing the membrane protein Atg9. This interaction is inhibited by the two regulatory subunits Atg31 and Atg29. Engagement of the Atg1-Atg13 subcomplex restores the Atg9-binding and membrane-tethering activity of Atg17. Our data help to unravel the mechanism that controls Atg17-mediated tethering of Atg9-vesicles, providing the molecular basis to understand initiation of autophagosome-biogenesis.

journal_name

Nat Commun

journal_title

Nature communications

authors

Rao Y,Perna MG,Hofmann B,Beier V,Wollert T

doi

10.1038/ncomms10338

subject

Has Abstract

pub_date

2016-01-12 00:00:00

pages

10338

issn

2041-1723

pii

ncomms10338

journal_volume

7

pub_type

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