Enzymatic Degradation of Polysaccharides in Microbial Systems

Microbial enzymatic degradation of polysaccharides underpins critical processes in global carbon cycling and industrial biotechnology. Polysaccharides such as cellulose, hemicellulose and heteropolymers like xanthan are depolymerised by diverse enzymes secreted by bacteria, fungi and archaea. Glycoside hydrolases cleave glycosidic bonds through hydrolysis, while polysaccharide lyases employ β-elimination to fragment uronic acid-rich polymers. Many of these biocatalysts carry non-catalytic carbohydrate-binding modules that guide substrates into catalytic sites, enhancing affinity and turnover. In nature and engineered reactors, individual enzymes often act in concert within microbial consortia, where synergistic degradation pathways enable efficient biomass conversion. Advances in structural biology, metagenomics and protein engineering have deepened insights into enzyme–substrate interactions, guiding the rational design of tailored biocatalysts. Furthermore, strategies to immobilise enzymes or whole cells extend operational stability and recyclability, supporting sustainable processes for waste valorisation, bioremediation and the production of high-value oligosaccharides and biofuels.

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Enzymatic Degradation of Polysaccharides in Microbial Systems publication trend

The graph below shows the total number of articles in enzymatic degradation of polysaccharides in microbial systems across all publications each year (not limited to Nature Index journals).

Technical terms

Polysaccharide: A long-chain carbohydrate polymer composed of repeating monosaccharide units.

Glycoside Hydrolase: An enzyme that catalyses the hydrolytic cleavage of glycosidic bonds between carbohydrates or between a carbohydrate and a non-carbohydrate moiety.

Polysaccharide Lyase: An enzyme that cleaves glycosidic bonds via β-elimination, often targeting uronic acid–containing polysaccharides.

Carbohydrate-Binding Module (CBM): A non-catalytic domain within a carbohydrate-active enzyme that recognises and binds specific polysaccharide structures to enhance catalytic action.

Oligosaccharide: A short-chain carbohydrate typically comprising three to ten monosaccharide residues.

Immobilised Biocatalyst: An enzyme or whole-cell system fixed on or within a support matrix to improve operational stability, reusability and process control.

References

1. Xanthan: enzymatic degradation and novel perspectives of applications. Applied Microbiology and Biotechnology (2024).
2. Identification of a novel xanthan-binding module of a multi-modular Cohnella sp. xanthanase. Frontiers in Microbiology (2024).
3. Whole-Cell PVA Cryogel-Immobilized Microbial Consortium LE-C1 for Xanthan Depolymerization. Catalysts (2023).