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Article Dans Une Revue Frontiers in Plant Science Année : 2021

Consequences of Mixotrophy on Cell Energetic Metabolism in Microchloropsis gaditana Revealed by Genetic Engineering and Metabolic Approaches

Davide Dal Bo
  • Fonction : co premier-auteur
Mariette Bedhomme
  • Fonction : co premier-auteur
Elodie Billey
  • Fonction : co premier-auteur
Etienne Deragon
  • Fonction : Auteur
Mattia Storti
Camille Rak
  • Fonction : Auteur
Morgane Lapeyre
  • Fonction : Auteur
Mehdi Lembrouk
  • Fonction : Auteur
Melissa Conte
  • Fonction : Auteur
Valérie Gros
Guillaume Tourcier
  • Fonction : Auteur
Denis Falconet
  • Fonction : Auteur
Gilles Curien
Guillaume Allorent
Juliette Jouhet
  • Fonction : Auteur
Eric Maréchal
  • Fonction : Auteur

Résumé

Algae belonging to the Microchloropsis genus are promising organisms for biotech purposes, being able to accumulate large amounts of lipid reserves. These organisms adapt to different trophic conditions, thriving in strict photoautotrophic conditions, as well as in the concomitant presence of light plus reduced external carbon as energy sources (mixotrophy). In this work, we investigated the mixotrophic responses of Microchloropsis gaditana (formerly Nannochloropsis gaditana ). Using the Biolog growth test, in which cells are loaded into multiwell plates coated with different organic compounds, we could not find a suitable substrate for Microchloropsis mixotrophy. By contrast, addition of the Lysogeny broth (LB) to the inorganic growth medium had a benefit on growth, enhancing respiratory activity at the expense of photosynthetic performances. To further dissect the role of respiration in Microchloropsis mixotrophy, we focused on the mitochondrial alternative oxidase (AOX), a protein involved in energy management in other algae prospering in mixotrophy. Knocking-out the AOX1 gene by transcription activator-like effector nuclease (TALE-N) led to the loss of capacity to implement growth upon addition of LB supporting the hypothesis that the effect of this medium was related to a provision of reduced carbon. We conclude that mixotrophic growth in Microchloropsis is dominated by respiratory rather than by photosynthetic energetic metabolism and discuss the possible reasons for this behavior in relationship with fatty acid breakdown via β-oxidation in this oleaginous alga.
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hal-03237438 , version 1 (26-05-2021)

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Davide Dal Bo, Leonardo Magneschi, Mariette Bedhomme, Elodie Billey, Etienne Deragon, et al.. Consequences of Mixotrophy on Cell Energetic Metabolism in Microchloropsis gaditana Revealed by Genetic Engineering and Metabolic Approaches. Frontiers in Plant Science, 2021, 12, ⟨10.3389/fpls.2021.628684⟩. ⟨hal-03237438⟩
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