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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Two Independent Pathways within Selective Autophagy Converge to Activate Atg1 Kinase at the Vacuole.
Molecular Cell 2016 October 21
Autophagy is a potent cellular degradation pathway, and its activation needs to be tightly controlled. Cargo receptors mediate selectivity during autophagy by bringing cargo to the scaffold protein Atg11 and, in turn, to the autophagic machinery, including the central autophagy kinase Atg1. Here we show how selective autophagy is tightly regulated in space and time to prevent aberrant Atg1 kinase activation and autophagy induction. We established an induced bypass approach (iPass) that combines genetic deletion with chemically induced dimerization to evaluate the roles of Atg13 and cargo receptors in Atg1 kinase activation and selective autophagy progression. We show that Atg1 activation does not require cargo receptors, cargo-bound Atg11, or Atg13 per se. Rather, these proteins function in two independent pathways that converge to activate Atg1 at the vacuole. This pathway architecture underlies the spatiotemporal control of Atg1 kinase activity, thereby preventing inappropriate autophagosome formation.
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