Nitrogen-starvation triggers cellular accumulation of triacylglycerol in Metarhizium robertsii.

Autor: Chen Y; CAS Key Laboratory of Insect Developmental and Evolutionary Biology, Shanghai Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai 200032, China., Cen K; CAS Key Laboratory of Insect Developmental and Evolutionary Biology, Shanghai Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai 200032, China., Lu Y; CAS Key Laboratory of Insect Developmental and Evolutionary Biology, Shanghai Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai 200032, China., Zhang S; CAS Key Laboratory of Insect Developmental and Evolutionary Biology, Shanghai Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai 200032, China., Shang Y; CAS Key Laboratory of Insect Developmental and Evolutionary Biology, Shanghai Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai 200032, China., Wang C; CAS Key Laboratory of Insect Developmental and Evolutionary Biology, Shanghai Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai 200032, China. Electronic address: cswang@sibs.ac.cn.
Jazyk: angličtina
Zdroj: Fungal biology [Fungal Biol] 2018 Jun; Vol. 122 (6), pp. 410-419. Date of Electronic Publication: 2017 Jul 13.
DOI: 10.1016/j.funbio.2017.07.001
Abstrakt: Nitrogen starvation can induce cellular triacylglycerol (TAG) accumulation in different organisms with an unclear mechanism. In this study, we performed nutrient starvation and lipid droplet (LD) proteomics analyses of the filamentous fungus Metarhizium robertsii. Our results indicated that nitrogen starvation activated cell autophagic activity but inhibited the internalization of LDs into vacuoles for degradation. LD proteomic analyses identified an array of differentially accumulated proteins including autophagy-related (ATG) proteins, heat shock proteins, TAG metabolic and phospholipid biosynthetic enzymes when the fungus was grown in different nutrient conditions. In contrast to the highly activated MrATG8, the ATG proteins involved in vacuolar LD internalization were down-regulated after nitrogen starvation. Cellular TAG contents were increased in different ATG-gene null mutants of M. robertsii. In addition, TAG increase could be due to the up-regulation of TAG biogenesis along with the down-regulation of TAG catabolic enzymes in fungal cells after nitrogen deprivation. The data of this study benefit our understanding of the mechanism of nitrogen starvation induced TAG increase in different cells.
(Copyright © 2017 British Mycological Society. Published by Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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