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Deciphering the metabolomic differences between two fast-growing cyanobacteria, S.elongatus PCC 11801 and 11802 via metabolite profiling

ABSTRACT: The study aims to identify the metabolic differences between two promising fast-growing, non-model cyanobacterial strains, S. elongatus PCC 11801 and PCC 11802. To this end, experiments were carried out to measure metabolite levels in the two cyanobacterial strains grown in shake flasks at a similar light intensity of approx. 300-350 µmole photons.m-2. s-1. The samples for metabolomics analysis were collected during the exponential growth phase at an optical cell density of 0.5-0.6. Isotopic ratio method was utilized to compare the metabolite levels and delineate the differences in their metabolic pathways.

ORGANISM(S): Synechococcus Elongatus

TISSUE(S): Bacterial Cells

SUBMITTER: Pramod Wangikar

PROVIDER: ST002245 | MetabolomicsWorkbench | Thu Jul 28 00:00:00 BST 2022

REPOSITORIES: MetabolomicsWorkbench

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Project description:Biological CO2 mitigation by photosynthetic microorganisms has emerged as a promising approach for generating biomass-based energy during the course of CO2 fixation. Additionally, cyanobacteria-based biofuels have also garnered immense attention lately because of the depleting fossil fuel reserves and the growing energy demands. Synechococcus elongatus PCC 11801, a fast-growing, high CO2 tolerant, novel isolate of cyanobacteria, is an interesting candidate for metabolic engineering applications. Since under laboratory conditions, it exhibited a high level of tolerance to different environmental stresses (CO2, light, temperature, salts and butanol), it seemed like an encouraging prospect for the production of fuels and other industrially relevant chemicals. This is the first-ever functional global proteomics investigation of Synechococcus elongatus PCC 11801 isolate grown at elevated CO2 levels using high-throughput iTRAQ approach. Three independent biological replicates were analyzed and a total of 861 proteins were identified, out of which 492 proteins were found to be present in all the three replicates. Of these, 248 proteins showing the same trend across the three replicates (≥1.5 fold up-regulation or ≤0.66 fold down-regulation) were chosen for pathway analysis. The metabolic responses were marked with a down-regulation of inorganic carbon transporters alongside an induction of nitrogen transport and absorption proteins in order to uphold the apposite carbon-nitrogen equilibrium. Further acclimation progression exposed an increased expression of proteins taking part in photosynthesis and generation of light harvesting pigments such as chlorophyll. Similarly, a downshift of proteins involved in photoprotection and defense against ROS (reactive oxygen species) was observed. Another principal discovery was the perturbation in expression of proteins belonging to central metabolic pathways like glycolysis, TCA cycle, pentose phosphate pathway as a coping mechanism to high CO2 stress. Further, validation studies were carried out using MRM assays and western blotting of key altered proteins.

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Deciphering the metabolomic differences between two fast-growing cyanobacteria, S.elongatus PCC 11801 and 11802 via metabolite profiling

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