Biotechnological Applications of α-Galactosidases

α-Galactosidases are glycoside hydrolases that catalyse the removal of terminal α-1,6-linked galactosyl moieties from galacto-oligosaccharides and polymeric galactomannans. Their capacity to hydrolyse raffinose family oligosaccharides (RFOs) has underpinned a range of applications in the food and feed industries, notably the reduction of flatulence-causing sugars in legume-derived products and the enhancement of soy-based beverage nutrition. Beyond hydrolytic uses, these enzymes facilitate transglycosylation reactions to generate value-added oligosaccharides with prebiotic or pharmaceutical potential. Thermostable and protease-resistant α-galactosidases, often sourced from thermophilic bacteria or engineered microbial hosts, extend operational windows in high-temperature processes and digestive environments. Advances in structural biology, protein engineering and immobilisation techniques have driven improvements in catalytic efficiency, substrate specificity and operational stability. Emerging discovery platforms, such as activity-based metaproteomics, are unlocking novel α-galactosidases from complex microbiomes, broadening the repertoire of biocatalysts for sustainable sugar processing, bioenergy upgrading and blood-group antigen modification. Collectively, these developments illustrate the global significance of α-galactosidases as versatile tools in industrial biotechnology and human health.

Research from Nature Portfolio

Recent studies have employed an activity-based metaproteomics platform to mine the mouse gut microbiome for authentic α-galactosidase activities. Using a cyclophellitol aziridine probe specific to α-galactosidases, researchers directly captured active enzymes from complex microbial extracts. Cryo-electron microscopy of a newly discovered enzyme revealed the covalent binding mode of the probe and shed light on catalytic residues. Biochemical assays demonstrated that several of these gut-derived α-galactosidases efficiently hydrolyse RFOs and can catalyse blood-group antigen transformations. This integrated strategy accelerates the functional annotation of microbiome enzymes and highlights their potential for industrial sugar conversion and biopharmaceutical applications.

Biotechnological Applications of α-Galactosidases publication trend

The graph below shows the total number of articles in biotechnological applications of α-galactosidases across all publications each year (not limited to Nature Index journals).

Technical terms

α-Galactosidase: Enzyme that hydrolyses terminal α-1,6-linked galactosyl residues from oligo- and polysaccharides.

Raffinose family oligosaccharides (RFOs): Oligosaccharides such as raffinose and stachyose, common in legumes and resistant to digestion.

Immobilisation: Technique of attaching enzymes to solid supports to enhance stability, reusability and process control.

Activity-Based Metaproteomics: Approach using chemical probes to label and identify active enzymes directly from complex microbial communities.

Cryo-electron microscopy: Imaging method that determines high-resolution structures of biomolecules at cryogenic temperatures.

Transglycosylation: Enzymatic transfer of a glycosyl moiety to an acceptor molecule, enabling synthesis of novel oligosaccharides.

References

1. Removal of raffinose and stachyose from soy-based beverages using soluble and immobilized MelA α-D-galactosidase from Lactiplantibacillus plantarum WCFS1. LWT (2024).
2. Activity-based metaproteomics driven discovery and enzymological characterization of potential α-galactosidases in the mouse gut microbiome. Communications Chemistry (2024).
3. Reaction pathways and integral kinetics for hydrolysis of soybean oligosaccharides by α-galactosidase and invertase. Process Biochemistry (2025).
4. A novel α-galactosidase from the thermophilic probiotic Bacillus coagulans with remarkable protease-resistance and high hydrolytic activity. PLOS ONE (2018).