Abstract
Xylanases catalyze the hydrolysis of xylans. Due to the heterogeneity and complex chemical nature of plant xylan, its complete breakdown requires the action of a complex of several hydrolytic enzymes. These enzymes show diverse specificity and different modes of action. The xylanolytic enzyme system carrying out the xylan hydrolysis is usually composed of several hydrolytic enzymes: β-1,4-endoxylanase; β-xylosidase; acetyl xylan esterase; arabinase; α-glucuronidases; ferulic acid esterase; and p-coumaric acid esterase. All of these enzymes act cooperatively to convert xylan into its constituent sugars. The presence of such a multifunctional xylanolytic enzyme system is found to be quite common among fungi, actinomycetes, and bacteria.
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