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Determination of the Glycogen Content in Cyanobacteria
Published on: July 17, 2017
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Nitrogen Availability Affects the Metabolic Profile in Cyanobacteria.
Kosuke Inabe1, Ayaka Miichi2, Mami Matsuda2
1Innovation and Technology and Engineering Biology Research Center, Kobe University, Nada, Kobe 657-8501, Japan.
Metabolites
|December 23, 2021
Summary
Cyanobacteria metabolism differs based on nitrogen source. Ammonium supports faster growth and higher metabolite levels than nitrate, indicating distinct assimilation pathways.
Area of Science:
- * Microbiology and biochemistry of cyanobacteria.
- * Metabolomics and nitrogen assimilation pathways.
Background:
- * Nitrogen is crucial for cellular biosynthesis, including amino acids, nucleotides, lipids, and sugars.
- * Cyanobacteria utilize various nitrogen sources like nitrate, ammonium, and urea.
- * Previous studies focused on physiological and genetic responses, but metabolic changes remain uncharacterized.
Purpose of the Study:
- * To investigate the metabolic profile differences in *Synechocystis* sp. PCC 6803 when supplied with nitrate versus ammonium.
- * To elucidate the impact of different nitrogen sources on cyanobacterial metabolism.
Main Methods:
- * Cultivation of *Synechocystis* sp. PCC 6803 with sodium nitrate (NaNO3) or ammonium chloride (NH4Cl).
- * Metabolome analysis to quantify metabolite levels.
- * 15N turnover rate analysis to assess nitrogen assimilation rates.
Main Results:
- * *Synechocystis* sp. PCC 6803 exhibited faster growth in NH4Cl medium compared to NaNO3 medium.
- * Metabolome analysis revealed higher abundance of metabolites in central carbon pathways (CBB, glycolysis, TCA) and amino acids under NH4Cl conditions.
- * 15N turnover rate analysis showed a higher nitrogen assimilation rate in NH4Cl medium.
Conclusions:
- * The nitrogen assimilation mechanism via the GS-GOGAT cycle differs between nitrate and ammonium utilization.
- * Cyanobacterial metabolite levels and biosynthesis rates are significantly influenced by the type of available nitrogen source.
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