Nitric Oxide Mediates Nitrite-Sensing and Acclimation and Triggers a Remodeling of Lipids
2017
Dolch, Lina-Juana | Lupette, Josselin | Tourcier, Guillaume | Bedhomme, Mariette | Collin, Séverine | Magneschi, Leonardo | Conte, Melissa | Seddiki, Khawla | Richard, Christelle | Corre, Erwan | Fourage, Laurent | Laeuffer, Frédéric | Richards, Robert, I. | Reith, Michael | Rébeillé, Fabrice | Jouhet, Juliette | Mcginn, Patrick | Maréchal, Eric | Physiologie cellulaire et végétale (LPCV) ; Institut National de la Recherche Agronomique (INRA)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut de Recherche Interdisciplinaire de Grenoble (IRIG) ; Direction de Recherche Fondamentale (CEA) (DRF (CEA)) ; Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) ; Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA) | Total Refining Chemicals | Station biologique de Roscoff = Roscoff Marine Station (SBR) ; Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) | Fédération de recherche de Roscoff (FR2424) ; Station biologique de Roscoff = Roscoff Marine Station (SBR) ; Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) | Aquatic and Crop Resource Development ; National Research Council of Canada (NRC) | National Research Council of Canada’s Algal Carbon Conversion Program | ANR-12-BIME-0005,DiaDomOil,Domestication des diatomées pour la production de biocarburants(2012) | ANR-11-BTBR-0008,OCEANOMICS,Biotechnologies et bioressources pour la valorisation des écosystèmes marins planctoniques(2011)
International audience
Показать больше [+] Меньше [-]Английский. Nitric oxide (NO) is an intermediate of the nitrogen cycle, an industrial pollutant, and a marker of climate change. NO also acts as a gaseous transmitter in a variety of biological processes. The impact of environmental NO needs to be addressed. In diatoms, a dominant phylum in phytoplankton, NO was reported to mediate programmed cell death in response to diatom-derived polyunsaturated aldehydes. Here, using the Phaeodactylum Pt1 strain, 2E,4E-decadienal supplied in the micromolar concentration range led to a nonspecific cell toxicity. We reexamined NO biosynthesis and response in Phaeodactylum NO inhibits cell growth and triggers triacylglycerol (TAG) accumulation. Feeding experiments indicate that NO is not produced from Arg but via conversion of nitrite by the nitrate reductase. Genome-wide transcriptional analysis shows that NO up-regulates the expression of the plastid nitrite reductase and genes involved in the subsequent incorporation of ammonium into amino acids, via both Gln synthesis and Orn-urea pathway. The phosphoenolpyruvate dehydrogenase complex is also up-regulated, leading to the production of acetyl-CoA, which can feed TAG accumulation upon exposure to NO. Transcriptional reprogramming leading to higher TAG content is balanced with a decrease of monogalactosyldiacylglycerol (MGDG) in the plastid via posttranslational inhibition of MGDG synthase enzymatic activity by NO. Intracellular and transient NO emission acts therefore at the basis of a nitrite-sensing and acclimating system, whereas a long exposure to NO can additionally induce a redirection of carbon to neutral lipids and a stress response.
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