Metabolic Engineering for Glucaric Acid Production
Summary
Glucaric acid is a versatile dicarboxylic acid recognised for its applications in biodegradable polymers, metal chelation, detergents and potential therapeutic agents. Traditional chemical oxidation routes rely on harsh reagents and generate significant waste, prompting the development of sustainable bioproduction methods. Metabolic engineering seeks to introduce or optimise biosynthetic pathways in microbial hosts such as Escherichia coli, Saccharomyces cerevisiae and Pichia pastoris. Central to these efforts is the conversion of glucose into myo-inositol, followed by its oxidation via myo-inositol oxygenase and subsequent dehydrogenation to yield glucaric acid. Key challenges include enhancing enzyme stability, balancing cofactor regeneration and alleviating metabolic bottlenecks. Strategies such as multi-copy gene integration, pathway scaffolding, protein fusion, fed-batch fermentation and cell-free enzyme cascades have driven titers from milligram to gram scale. Recent innovations in feedstock utilisation and co-culture systems promise integrated bioprocesses that convert lignocellulosic biomass directly into glucaric acid, advancing a circular bioeconomy.
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Metabolic Engineering for Glucaric Acid Production publication trend
The graph below shows the total number of articles in metabolic engineering for glucaric acid production across all publications each year (not limited to Nature Index journals).
Technical terms
Glucaric acid: A six-carbon dicarboxylic acid derived from glucose, used in polymers, detergents and therapeutics.
Metabolic engineering: The directed modification of cellular pathways to enhance the production of a target compound.
myo-Inositol: A cyclic sugar alcohol intermediate formed from glucose that is oxidised en route to glucaric acid.
myo-Inositol oxygenase (MIOX): An enzyme that catalyses the oxidation of myo-inositol to D-glucuronic acid.
Uronate dehydrogenase (Udh): An enzyme that converts D-glucuronic acid into D-glucaric acid.
Consolidated bioprocessing (CBP): A strategy combining biomass hydrolysis and fermentation in a single step, often via microbial consortia.
References
- Production of Hexaric Acids from Biomass. International Journal of Molecular Sciences (2019).
- Cell-based and cell-free biocatalysis for the production of d-glucaric acid. Biotechnology for Biofuels and Bioproducts (2020).
- Biosynthesis of Glucaric Acid by Recombinant Strain of Escherichia coli Expressing Two Different Urinate Dehydrogenases. Fermentation (2023).
- Production of d-glucaric acid with phosphoglucose isomerase-deficient Saccharomyces cerevisiae. Biotechnology Letters (2023).
- Consolidated bioprocessing of lignocellulose for production of glucaric acid by an artificial microbial consortium. Biotechnology for Biofuels and Bioproducts (2021).
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