Selective transport of alpha-mannosidase by autophagic pathways: identification of a novel receptor, ATG34.

Tokyo Institute of Technology, Japan.
In Saccharomyces cerevisiae, aminopeptidase I (Ape1p) and alpha-mannosidase (Ams1p) are known cargoes of selective autophagy. Atg19p has been identified as an Ape1p receptor and targets Ape1p to the pre-autophagosomal structure (PAS). Under nutrient-rich conditions, transport of Ams1p to the vacuole largely depends on Atg19p. Here, we show that Atg34p (Yol083wp), a homolog of Atg19p, is a receptor for Ams1p transport during autophagy. Atg34p interacts with Ams1p, Atg11p, and Atg8p using distinct domains. Ams1p forms a homooligomer after synthesis and binds to the Ams1-binding domain of Atg34p; this binding is important for the formation of a higher-order complex named the Ams1 complex. In the absence of the interaction of Atg34p with Atg8p, the Ams1 complex is targeted to the PAS but fails to transit to the vacuole, indicating that the interaction of Atg34p with Atg8p is crucial for the Ams1 complex to be enclosed by autophagosomes. Atg34p and Atg19p have similar domain structures and are important for Ams1p transport during autophagy.
Mesh Terms:
Adenosine Triphosphatases, Animals, Dynamins, Evolution, Humans, Mammals, Membrane Fusion, Mitochondria, Optic Atrophy, Autosomal Dominant, Protein Isoforms, Saccharomyces cerevisiae, Schizosaccharomyces
Unknown Jul. 16, 2010; 0(0); [PUBMED:20639194]
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