Enzymatic Characterization of Glycoside Hydrolases

Glycoside hydrolases constitute a vast class of enzymes responsible for cleaving glycosidic bonds between carbohydrate moieties or between carbohydrates and non-sugar substituents. These enzymes are grouped into families on the basis of sequence and structural homology, with each family exhibiting characteristic catalytic machinery and substrate specificity. Enzymatic characterisation typically encompasses determination of kinetic parameters, identification of key catalytic residues, structural analysis by crystallography or cryo-EM, and investigation of dynamic behaviour through molecular simulations. Distinctions between processive and distributive modes of action, mechanisms of substrate translocation, and the roles of accessory binding sites are of particular interest. Such studies underpin advances in biomass conversion, where enzyme cocktails deconstruct lignocellulose to fermentable sugars, as well as in the modulation of glycan processing in health and disease. Tailoring glycoside hydrolases through mutagenesis or domain engineering has yielded variants with enhanced stability, altered specificity and reduced product inhibition, thereby broadening their industrial and biomedical applications.

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Enzymatic Characterization of Glycoside Hydrolases publication trend

The graph below shows the total number of articles in enzymatic characterization of glycoside hydrolases across all publications each year (not limited to Nature Index journals).

Technical terms

Glycosidic bond: A covalent linkage between carbohydrate units or between a carbohydrate and another moiety formed via oxygen or nitrogen bridging.

Processive catalysis: A mode of enzyme action in which multiple successive bond-cleavage events occur without enzyme–substrate complex dissociation.

Active site: The specific region of an enzyme where substrate binding and chemical transformation take place, typically comprising key catalytic residues.

Catalytic dyad: Two amino acid residues within an enzyme active site that work cooperatively to facilitate proton transfer and bond cleavage.

Molecular dynamics simulation: A computational method that models the time-dependent behaviour of atoms and molecules to explore conformational changes and interactions.

References

1. Molecular mechanisms of processive glycoside hydrolases underline catalytic pragmatism. Biochemical Society Transactions (2023).
2. Analysis of the effect of metal ions on the ability of Xylanase to hydrolyze wheat bran by molecular dynamics simulations. Frontiers in Bioengineering and Biotechnology (2023).
3. Structural and Kinetic Analysis of Bacillus subtilis N-Acetylglucosaminidase Reveals a Unique Asp-His Dyad Mechanism*. Journal of Biological Chemistry (2010).