Spirulina subsalsa PCC 9445
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA158827 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| Other | ||||
| SRR3926858_1.fastq.gz | Fastqsanger.gz | |||
| SRR3926858_2.fastq.gz | Fastqsanger.gz |
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Project description:Background Microalgae represent a suitable and eco-sustainable resource for human needs thanks to their fast growth ability, together with the great diversity in species and intracellular secondary bioactive metabolites. These high-added-value compounds are of great interest for human health or animal feed. The intracellular content of these valuable compound families is tightly associated with the microalgal biological state and responds to environmental cues, e.g., light. Our study develops a Biotechnological response curve strategy exploring the bioactive metabolites synthesis in the marine cyanobacterium Spirulina subsalsa over a light energy gradient. The Relative Light energy index generated in our study integrates the red, green and blue photon flux density with their relative photon energy. The Biotechnological response curve combined biochemical analysis of the macromolecular composition (total protein, lipid, and carbohydrate content), total sterols, polyphenols and flavonoids, carotenoids, phenolic compounds, vitamins (A, B1, B2, B6, B9, B12, C, D2, D3, E, H, and K1), phycobiliproteins, together with the antioxidant activity of the biomass as well as the growth ability and photosynthesis. Results Results demonstrated that light energy significantly modulate the biochemical status of the microalga Spirulina subsalsa revealing the relevance of the light energy index to explain the light-induced biological variability. The sharp decrease of the photosynthetic rate at high light energy was accompanied with an increase of the antioxidant network response, such as carotenoids, total polyphenols, and the antioxidant capacity. Conversely, low light energy favorized the intracellular content of lipids and vitamins (B2, B6, B9, D3, K1, A, C, H, and B12) compared to high light energy. Conclusions Results of the Biotechnological response curves were discussed in their functional and physiological relevance as well as for the essence of their potential biotechnological applications. This study emphasized the light energy as a relevant tool to explain the biological responses of microalgae towards light climate variability, and, therefore, to design metabolic manipulation of microalgae. Supplementary Information The online version contains supplementary material available at 10.1186/s13068-023-02277-4.
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Project description:Arthrospira is an edible cyanobacterium used in the food supplement “Spirulina”. The aim of this work was to characterise its response to ionising radiation. Live cells of Arthrospira sp. PCC 8005 were irradiated with 60Co gamma rays. Arthrospira sp. PCC 8005 recovered and resumed photosynthetic proliferation after exposure to a dose of even 6400 Gy, which is a dose about 1000x higher than the lethal dose for most plant, animal and human cells. Biochemical, proteomic and transcriptomic analysis after irradiation with 3200 or 5000 Gy showed a strong reduction in photosynthesis activity and reduced pigment content. Irradiated cells showed reduced transcription for carbon fixation, and for pigment, lipid and secondary metabolite synthesis; while induced transcription of thiol-based antioxidant systems, photosensing and signalling pathways. Cells irradiated with 3200 or 5000 Gy did not show clear dsDNA damage, but transcriptomics did show significant activation of ssDNA repair systems and mobile genetic elements at RNA-level. Irradiated cells also expressed a group of conserved proteins of which the function in radiation resistance remains to be elucidated. This study revealed for the first time the high radiation resistance of Arthrospira, and the molecular systems involved, paving the way for its further exploitation for radiation protection.
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