Endo-1,4-beta-xylanase (Xylanase)

Endo-1,4-beta-xylanase is a glycoside hydrolase responsible for the internal cleavage of beta-1,4-xylosidic linkages in xylan, which is the second most abundant polysaccharide in plant cell walls [11, 22]. While humans and other mammals lack the genetic capacity to synthesize this enzyme, it is produced by a wide variety of microorganisms, including bacteria and fungi, to extract energy from plant biomass [3, 8, 17]. Industrially, xylanases are critical processing aids in the baking industry for improving dough stability and volume, and in the paper and pulp industry for the bio-bleaching of pulp [13, 20, 21]. In clinical and pharmacological contexts, xylanase is not typically a target for drug development but is highly relevant as a potent occupational allergen. Exposure to xylanase dust, particularly in bakeries (baker's asthma), can induce IgE-mediated sensitization leading to occupational asthma, allergic rhinitis, and contact dermatitis [1, 5, 23]. Conversely, exogenous xylanases are utilized as active ingredients in oral multi-enzyme digestive supplements designed to improve the digestibility of high-fiber plant foods and reduce symptoms of malabsorption, such as bloating and excessive gas [4, 6, 7]. Recent research also explores its role in modulating the gut microbiome by producing prebiotic xylo-oligosaccharides that support the growth of beneficial bacteria [16, 17].

Other names

1,4-beta-D-xylan xylanohydrolaseEndo-1,4-xylanaseEndoxylanaseBeta-1,4-xylanaseHemicellulase (broadly)

Endo-1,4-beta-xylanase catalyzes the endohydrolysis of (1->4)-beta-D-xylosidic linkages in xylans, the primary constituent of hemicellulose, converting complex polysaccharides into xylo-oligosaccharides and xylose.