Gamma-Aminobutyric Acid Production in Fermented Systems

Gamma-aminobutyric acid (GABA) is a non-proteinogenic amino acid widely recognised for its role as the principal inhibitory neurotransmitter in the mammalian central nervous system and for exhibiting diverse bioactive properties, including anti-hypertensive, anti-diabetic and stress-reducing effects. Microbial fermentation has emerged as a sustainable route for GABA production, leveraging the metabolic versatility of lactic acid bacteria (LAB) and other food-grade microorganisms. In these systems, L-glutamate is enzymatically decarboxylated to yield GABA and carbon dioxide, a reaction catalysed by the pyridoxal-5′-phosphate-dependent enzyme glutamate decarboxylase (GAD). The acid-tolerance mechanisms inherent to many LAB strains, often mediated by GAD systems, not only enhance cell survival under low-pH conditions but also drive efficient GABA synthesis. Advances in process engineering, such as optimised fed-batch fermentation and co-culture strategies, together with molecular approaches including strain selection, metabolic engineering and synthetic biology, have substantially increased titers and productivities. These developments underpin a growing pipeline of GABA-enriched functional foods—ranging from yogurts and cheeses to beverages—that combine nutritional appeal with potential health benefits. The global significance of GABA-fortified fermentates spans both the food and pharmaceutical sectors, aligning consumer demand for natural, bioactive ingredients with industrial objectives of scalable, cost-effective production.

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Gamma-Aminobutyric Acid Production in Fermented Systems publication trend

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Technical terms

Gamma-aminobutyric acid (GABA): A non-protein amino acid and primary inhibitory neurotransmitter with bioactive functions.

Glutamate decarboxylase (GAD): A pyridoxal-5′-phosphate-dependent enzyme catalysing the conversion of L-glutamate to GABA and CO₂.

Lactic acid bacteria (LAB): A group of gram-positive, fermentative microorganisms commonly used in food production and known for safety and acid tolerance.

Fed-batch fermentation: A bioprocess mode in which substrates are continuously or intermittently added to a culture to maintain optimal growth and product formation.

Pyridoxal-5′-phosphate (PLP): A derivative of vitamin B₆ that serves as a coenzyme for the GAD reaction.

References

1. Production of Gamma-Aminobutyric Acid from Lactic Acid Bacteria: A Systematic Review. International Journal of Molecular Sciences (2020).
2. Production of gamma-aminobutyric acid by Lactobacillus brevis NCL912 using fed-batch fermentation. Microbial Cell Factories (2010).
3. Exploring the contributions of two glutamate decarboxylase isozymes in Lactobacillus brevis to acid resistance and γ-aminobutyric acid production. Microbial Cell Factories (2018).
4. Glutamate Decarboxylase from Lactic Acid Bacteria—A Key Enzyme in GABA Synthesis. Microorganisms (2020).