Comparative proteomics reveals proteins impacted by nitrogen deprivation in wild-type and high lipid-accumulating mutant strains of Tisochrysis lutea

Type Article
Date 2014-06
Language English
Author(s) Garnier Matthieu1, Carrier GregoryORCID1, Rogniaux Helene2, Nicolau ElodieORCID1, Bougaran GaelORCID1, Saint-Jean Bruno1, Cadoret Jean-Paul1
Affiliation(s) 1 : Ifremer, Lab BRM PBA Nantes, France.
2 : INRA, Biopolymers Interact Assemblies UR1268, F-44316 Nantes, France.
Source Journal Of Proteomics (1874-3919) (Elsevier Science Bv), 2014-06 , Vol. 105 , P. 107-120
DOI 10.1016/j.jprot.2014.02.022
WOS© Times Cited 20
Keyword(s) Microalgae, Biotechnology, Lipid, Nitrogen, Proteomic, Selection
Abstract Understanding microalgal lipid accumulation under nitrogen starvation is of major interest for biomass feedstock, food and biofuel production. Using a domesticated oleaginous algae Tisochrysis lutea, we performed the first comparative proteomic analysis on the wild type strain and a selected lipid over-accumulating mutant. 2-DE analysis was made on these strains cultured in two metabolic conditions, with and without nitrogen deprivation, which revealed significant differences in proteomes according to both strain and nitrogen availability. Mass spectrometry allowed us to identify 37 proteins that were differentially expressed between the two strains, and 17 proteins regulated by nitrogen starvation concomitantly with lipid accumulation. The proteins identified are known to be involved in various metabolic pathways including lipid, carbohydrate, amino acid, energy and pigment metabolisms, photosynthesis, protein translation, stress response and cell division. Four candidates were selected for possible implication in the over-accumulation of lipids during nitrogen starvation. These include the plastid beta-ketoacyl-ACP reductase protein, the coccolith scale associated protein and two glycoside hydrolases involved in biosynthesis of fatty acids, carbon homeostasis and carbohydrate catabolism, respectively. This proteomic study confirms the impact of nitrogen starvation on overall metabolism and provides new perspectives to study the lipid over-accumulation in the prymnesiophyte haptophyte T. lutea.

Biological significance

This paper study consists of the first proteomic analysis on Tisochrysis lutea, a non-model marine microalga of interest for aquaculture and lipids production. Comparative proteomics revealed proteins putatively involved in the up-accumulation of neutral lipids in a mutant strain during nitrogen starvation. The results are of great importance for future works to improve lipid accumulation in microalgae of biotechnological interest for biofuel production. This article is part of a Special Issue entitled: Proteomics of non-model organisms.
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Garnier Matthieu, Carrier Gregory, Rogniaux Helene, Nicolau Elodie, Bougaran Gael, Saint-Jean Bruno, Cadoret Jean-Paul (2014). Comparative proteomics reveals proteins impacted by nitrogen deprivation in wild-type and high lipid-accumulating mutant strains of Tisochrysis lutea. Journal Of Proteomics, 105, 107-120. Publisher's official version : https://doi.org/10.1016/j.jprot.2014.02.022 , Open Access version : https://archimer.ifremer.fr/doc/00179/29012/