Engineering of synthetic Bacillus subtilis microbial consortia for biotechnological purposes
Ingénierie de consortia microbiens synthétiques de Bacillus subtilis à visée biotechnologique
Résumé
Whether for the production of pharmaceuticals, biofuels, biochemicals or other high value
compounds, synthetic biologists try to implement heterologous metabolic pathways in genetically
modified organisms. However, the introduction of heterologous pathways into the host can result in
a substantial metabolic burden that limits the overall productivity of the system. One solution to this
limitation could be the use of mixed communities, in which subpopulations produce complementary
enzymes that work jointly to fulfill a function of interest. This biomimetic strategy is called division
of labor and is known to significantly improve the stability, robustness, and functionality of a
community when compared to monocultures.
Here, we build an engineered synthetic consortia aimed at degrading lignocellulose, which is
the world’s largest agro-industrial by-product and could be turned into low-cost renewable
feedstocks for bioproduction. To do so, we aim to split the heterologous pathway of interest into
two strains of the workhorse Gram-positive bacterium Bacillus subtilis. To ensure the required
stability of the consortium for the whole pathway of interest to be completed, we chose to make our
strains dependent on each other for amino acids. Briefly, after selecting the most efficient amino
acids complementation, we try to optimize this synergetic interaction by directed evolution and
assess the efficiency of the division of labor. Finally, the development of a landing platform for
modular cloning in the B. subtilis chromosome will allow easy and rapid adaptation of our
consortium to any pathway of interest.
Domaines
Sciences du Vivant [q-bio]Origine | Fichiers produits par l'(les) auteur(s) |
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