Project description:Limited systems-level understanding of CO2 concentrating mechanism (CCM) and metabolic adaption in response to different CO2-level in wild oleaginous algae has hindered the development of microalgal feedstock and the knowledge of its role in global warming and oceanic acidification. Nannochloropsis are a group of small unicellular microalgae widely distributed in oceans and fresh water, which implies that it plays a crucial role in biogeochemical cycles impinged on global climate change. In addition, Nannochloropsis has been used for flue gas fixation in many large-scale and pilot-scale outdoor cultivation facilities for photosynthetic production of fuels and chemicals. To untangle the intricate genome-wide networks underlying CCM and metabolic adjustment under different CO2 concentrations in Nannochloropsis, we applied high-throughput mRNA-sequencing and reconstructed the structure and dynamics of the genome-wide functional network underlying robust microalgal CCM and in Nannochloropsis oceanica, by tracking the genome-wide, single-base-resolution transcript change for the complete time-courses of different CO2 concentrations.
Project description:To examine the mechanisms during oil production and integrate analysis of lactylation in N. oceanica, protein expression profiles were tracked after nitrogen deprivation for three days using 4D label-free proteome method. Under nitrogen deprivation (ND) and nitrogen repletion (NR) cultivation conditions, we mapped proteome of proliferating microalgal cells.
Project description:Limited systems-level understanding of oil synthesis in wild oleaginous algae has hindered the development of microalgal feedstock. Nannochloropsis is a small unicellular microalgae widely distributed in oceans and fresh water. In many large-scale and pilot-scale outdoor cultivation facilities, Nannochloropsis strains have been found to be capable of robust growth when supplied with flue gases, naturally accumulating large quantities of oils in a stationary phase, and exhibiting resistance to environmental contaminants. The rich genomic resources, compact genomes, resistance to foreign DNA invasion, wide ecological adaptation, large collections of natural strains and the demonstrated ability to grow on a large scale suggested Nannochloropsis can serve as research models and platform strains for economical and scalable photosynthetic production of fuels and chemicals. To untangle the intricate genome-wide networks underlying the robust biomass accumulation and oil production in Nannochloropsis, we applied high-throughput mRNA-sequencing and reconstructed the structure and dynamics of the genome-wide functional network underlying robust microalgal triacylglycerol (TAG) production in Nannochloropsis oceanica, by tracking the genome-wide, single-base-resolutiontranscript change for the complete time-courses of nitrogen-depletion-induced TAG synthesis.
2014-05-14 | GSE42508 | GEO
Project description:Cultivation Material Compost Bacteria
Project description:Lysine lactylation as a type of posttranslational modifications (PTMs) is recently associated with chromatin remodeling and gene transcription, but lysine lactylation of histone and non-histone proteins has not yet been studied in Nannochloropsis oceanica. To examine the prevalence and function of lactylation in N. oceanica, protein lactylation modification profiles were tracked after nitrogen deprivation for three days using 4D label-free proteome method. Under nitrogen deprivation (ND) and nitrogen repletion (NR) cultivation conditions, we mapped lactylome of proliferating microalgal cells.
Project description:Microalgal lipid, a feasible substrate for biofuel, is typically accumulated during the stationary growth phase. Generating strains which trigger lipogenesis from the exponential growth phase will enhance lipid productivity, reduce cost of biofuel production. We characterized a lipid-rich microalgal mutant, Dunaliella tertiolecta, which exhibited a six-fold enhancement of neutral lipids production in the exponential growth phase with marginal compromise on growth (4%). Using transcriptomics and metabolomics, regulatory mechanisms of the mutant were uncovered.
Project description:Protist predators are the primary agents of top-down control of bacteria and primary producers, and thus key organisms determining the fate and transport of organic matter in nature. In this study, we address the effects of light and silver stress on the mixotrophic protist Poterioochromonas malhamensis by means of mass spectrometry-based label-free proteomics.