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Hrr25 phosphorylates the autophagic receptor Atg34 to promote vacuolar transport of α‐mannosidase under nitrogen starvation conditions
Author(s) -
Mochida Keisuke,
Ohsumi Yoshinori,
Nakatogawa Hitoshi
Publication year - 2014
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/j.febslet.2014.09.032
Subject(s) - autophagy , vacuole , phosphorylation , microbiology and biotechnology , mannosidase , signal transducing adaptor protein , chemistry , saccharomyces cerevisiae , signal transduction , biochemistry , biology , enzyme , gene , cytoplasm , apoptosis
In Saccharomyces cerevisiae , under nitrogen‐starvation conditions, the α‐mannosidase Ams1 is recognized by the autophagic receptor Atg34 and transported into the vacuole, where it functions as an active enzyme. In this study, we identified Hrr25 as the kinase that phosphorylates Atg34 under these conditions. Hrr25‐mediated phosphorylation does not affect the interaction of Atg34 with Ams1, but instead promotes Atg34 binding to the adaptor protein Atg11, which recruits the autophagy machinery to the Ams1–Atg34 complex, resulting in activation of the vacuolar transport of Ams1. Our findings reveal the regulatory mechanism of a biosynthetic pathway mediated by the autophagy machinery.