Hydrolysis of oligosaccharides of the ?-(1?4)-linked d-xylose series by an endo(1?4)-?-d-xylanase from the anaerobic rumen fungus Neocallimastix frontalis

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Abstract
An endo-(1→4)-β-d-xylanase from Neocallimastix frontalis was purified by anion-exchange chromatography. The enzyme had an apparent molecular mass of 30 kDa on SDS-PAGE and exhibited maximum activity at 50°C and at pH values between 6.0 and 6.6. Kinetic studies on the hydrolysis of xylo-oligosaccharides, ranging from xylobiose to xylodecaose, showed that xylohexaose and xyloheptaose were the preferred substrates for the enzyme and that xylobiose, xylotriose and xylotetraose were not hydrolysed. Xylose was not a product of the hydrolysis of any of the xylo-oligosaccharide substrates tested. The enzyme appeared to have a strong preference for the hydrolysis of the internal glycosidic bonds of the oligosaccharides, which is typical of endo-(1→4)-β-d-xylanase activity, but it differed from other fungal endo-(1→4)-β-d-xylanases in that it had uniform action on the various internal linkages in the xylo-oligosaccharides.