Abstract
The mode of action of the extracellular endo-(1→4)-β- D-xylanase produced by Trametes hirsuta on a (4- O-methyl- D-glucurono)- D-xylan and a modified, essentially neutral D-xylan from white willow ( Salix alba L.) has been studied. Xylotetraose and xylohexaose, together with aldotetraouronic and aldohexaouronic acids, were the main products. The acidic oligosaccharides had a 4- O-methyl- D-glucopyranosyluronic acid group attached to the non-reducing D-xylosyl end-group. The action pattern of the xylanase corresponds to that of a typical endo-enzyme that acts more readily in the middle of chain, and the specific region of its action appears to involve five D-xylosyl residues. The products of the enzymic treatment of the D-xylan have revealed a regular distribution of the 4- O-methyl- D-glucopyranosyluronic acid groups attached to the D-xylan backbone.
Published Version
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