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Sci Rep ; 7: 44296, 2017 03 13.
Article in English | MEDLINE | ID: mdl-28287158

ABSTRACT

Compartmentalization of metabolic pathways to particular organelles is a hallmark of eukaryotic cells. Knowledge of the development of organelles and attendant pathways under different metabolic states has been advanced by live cell imaging and organelle specific analysis. Nevertheless, relatively few studies have addressed the cellular localization of pathways for synthesis of fungal secondary metabolites, despite their importance as bioactive compounds with significance to medicine and agriculture. When triggered to produce sesquiterpene (trichothecene) mycotoxins, the endoplasmic reticulum (ER) of the phytopathogenic fungus Fusarium graminearum is reorganized both in vitro and in planta. Trichothecene biosynthetic enzymes accumulate in organized smooth ER with pronounced expansion at perinuclear- and peripheral positions. Fluorescence tagged trichothecene biosynthetic proteins co-localize with the modified ER as confirmed by co-fluorescence and co-purification with known ER proteins. We hypothesize that changes to the fungal ER represent a conserved process in specialized eukaryotic cells such as in mammalian hepatocytes and B-cells.


Subject(s)
Endoplasmic Reticulum/metabolism , Fusarium/metabolism , Mycotoxins/biosynthesis , Trichothecenes/biosynthesis , Biosynthetic Pathways/genetics , Endoplasmic Reticulum/ultrastructure , Fungal Proteins/genetics , Fungal Proteins/metabolism , Fusarium/genetics , Fusarium/physiology , Luminescent Proteins/genetics , Luminescent Proteins/metabolism , Microscopy, Electron, Transmission , Microscopy, Fluorescence , Plant Diseases/microbiology , Secondary Metabolism/genetics , Triticum/microbiology
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