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Storage lipid synthesis is necessary for autophagy induced by nitrogen starvation
Author(s) -
Li Dan,
Song Jing-Zhen,
Li Hui,
Shan Mei-Hua,
Liang Yongheng,
Zhu Jing,
Xie Zhiping
Publication year - 2015
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.2014.11.050
Subject(s) - autophagy , atg8 , lipid metabolism , atg5 , microbiology and biotechnology , lipid droplet , starvation , chemistry , biogenesis , autophagosome , biochemistry , biology , apoptosis , endocrinology , gene
Nitrogen starvation is a universal stimulus of autophagy. At present, little is known about the relationship between carbon metabolism and autophagy under nitrogen starvation. Here, we show that yeast cells continue to consume glucose and downregulate fermentation under nitrogen starvation. Storage lipid production is increased, with concurrent proliferation of lipid droplets. Furthermore, we provide evidence that triacylglycerol synthesis is crucial for autophagosome biogenesis. It is involved in a step downstream of PAS (phagophore assembly site) scaffold assembly, and upstream of the recruitment of Atg1, Atg14, Atg5 and Atg8. Finally, we demonstrate that lipid droplets transiently interact with Atg8‐containing membranes. Our study reveals a novel connection linking neutral lipid metabolism, lipid droplets and autophagy.