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Green algae, also referred to as chlorophytes, are different from red algae in having the chloroplasts containing chlorophylls a and b, which give them their distinct green hue. However, they lack phycobiliproteins, preventing them from developing the red or blue-green pigmentation seen in red algae. In terms of photosynthetic pigment composition, green algae closely resemble plants and share a close evolutionary relationship with them. Taxonomically Green algae belong to Phylum Chlorophyta in...
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The kingdom Archaeplastida encompasses red and green algae, along with land plants. Unlike other protists with chloroplasts that arose through secondary endosymbiosis, only red and green algae originated from primary endosymbiotic events. This diverse group of eukaryotic organisms contains chlorophyll and performs oxygenic photosynthesis.Algae exist in various forms, from large brown kelp in coastal waters to green scum in puddles and stains on rocks or soil. Some species are responsible for...
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Red algae, also known as rhodophytes, are primarily found in marine environments, though some species inhabit freshwater and terrestrial ecosystems. These organisms exist in both unicellular and multicellular forms, with some multicellular varieties reaching macroscopic sizes.As phototrophic organisms, red algae contain chlorophyll a; however, their chloroplasts lack chlorophyll b. Instead, they possess phycobiliproteins, which serve as major light-harvesting pigments, similar to those found in...
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Carbon is the basis of all organic matter on Earth, and is recycled through the ecosystem in two primary processes: one in which carbon is exchanged among living organisms, and one in which carbon is cycled over long periods of time through fossilized organic remains, weathering of rocks, and volcanic activity. Human activities, including increased agricultural practices and the burning of fossil fuels, has greatly affected the balance of the natural carbon cycle.
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Carbon dioxide fixation in prokaryotes enables the assimilation of inorganic carbon into organic molecules, supporting biosynthetic pathways, sustaining ecosystems, and contributing to the global carbon cycle. It also has industrial applications in carbon capture and bioproduct synthesis. Autotrophic organisms rely on this process to utilize CO₂ as a carbon source in diverse environments.The Calvin CycleThe Calvin cycle is the most widespread carbon fixation mechanism, primarily used by...
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How microalgae conserve carbon.

Yonghua Li-Beisson1, Ousmane Dao2, Minjae Kim3

  • 1Aix Marseille University, CEA, CNRS, BIAM, Institut de Biosciences et Biotechnologies Aix-Marseille, CEA Cadarache, 13108 Saint Paul-Lez-Durance, France.

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Summary
This summary is machine-generated.

Microalgae link photosynthesis and fatty acid production by connecting CO2-concentrating mechanisms (CCMs) with fatty acid synthesis (FAS). This crosstalk is dynamic, adjusting to changing carbon dioxide levels.

Keywords:
CO(2)-concentrating mechanismsacetyl-CoA carboxylasecarbonic anhydrasefatty acid synthesisliquid–liquid phase separationpyrenoid

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Area of Science:

  • Chloroplast biology
  • Biochemistry
  • Microalgal metabolism

Background:

  • Photosynthesis and fatty acid biosynthesis are key chloroplast pathways.
  • Microalgae employ CO2-concentrating mechanisms (CCMs) to optimize photosynthesis.
  • Carbonic anhydrase (CAH) and acetyl-CoA carboxylase (ACC) are crucial enzymes in these pathways.

Purpose of the Study:

  • To investigate the functional link between CCM and fatty acid synthase (FAS).
  • To understand the spatial and temporal dynamics of the crosstalk between CAH and ACC.
  • To determine how environmental CO2 levels influence this interaction.

Main Methods:

  • Enzyme activity assays
  • Subcellular localization studies
  • Metabolic flux analysis
  • Genetic manipulation of microalgal strains

Main Results:

  • Demonstrated functional linkage between CCM and FAS via spatial proximity of CAH and ACC.
  • Showcased dynamic, spatially and temporally regulated crosstalk between these enzymes.
  • Confirmed that this interaction responds to environmental CO2 availability.

Conclusions:

  • CCM and FAS are functionally integrated within the chloroplast.
  • The dynamic crosstalk between CAH and ACC is a key regulatory mechanism for carbon utilization in microalgae.
  • This crosstalk optimizes both photosynthesis and fatty acid biosynthesis in response to environmental cues.