Gut microbiota glycoside hydrolase (None established; GH is a standard abbreviation for glycoside hydrolase, sometimes extended to GM-GH in scientific discussions.)

Gut microbiota glycoside hydrolases are a large, diverse group of microbial enzymes found in the human gastrointestinal tract, classified within the carbohydrate-active enzyme (CAZyme) superfamily. These enzymes hydrolyze glycosidic bonds in complex sugars found in dietary polysaccharides, host-produced glycoproteins (such as mucins and immunoglobulins), and exogenous compounds, including many pharmaceuticals and plant-derived natural products. They are essential for breaking down carbohydrates that the human genome cannot fully degrade, thereby supplying energy to microbiota and influencing host physiology, immune maturation, and drug metabolism. Alterations in gut GH activity are implicated in multiple human disease processes, and the enzymes are currently under investigation as potential therapeutic targets and biomarkers for patient stratification. The most well-studied classes include β-galactosidases, fucosidases, sialidases, and specialized mucin-degrading enzymes, which are encoded by many prominent gut bacteria such as Bacteroides, Akkermansia, and Bifidobacterium.

Other names

Glycoside hydrolase (GH)GlycosidaseGlycosyl hydrolaseMicrobial glycoside hydrolase

Competitive or noncompetitive inhibition of glycoside hydrolase active site to block carbohydrate hydrolysis Alteration of gut microbiota metabolism, impacting drug bioactivation, detoxification, or efficacy Modulation of host-microbiota interactions through control of glycan availability (sometimes indirectly via targeting mucin-degrading strains)