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. 1986 Apr;51(4):746–752. doi: 10.1128/aem.51.4.746-752.1986

Production and Properties of Xylan-Degrading Enzymes from Cellulomonas uda

Peter Rapp 1,*, Fritz Wagner 1
PMCID: PMC238959  PMID: 16347038

Abstract

Xylan degradation and production of β-xylanase and β-xylosidase activities were studied in cultures of Cellulomonas uda grown on purified xylan from birchwood. β-Xylanase activity was found to be associated with the cells, although in various degrees. The formation of β-xylanase activity was induced by xylotriose and repressed by xylose. β-Xylosidase activity was cell bound. Both constitutive and inducible β-xylosidase activities were suggested. β-Xylanase and β-xylosidase activities were inhibited competitively by xylose. β-Xylanase activity had a pronounced optimum pH of 5.8, whereas the optimum pH of β-xylosidase activity ranged from 5.4 to 6.1. The major products of xylan degradation by a crude preparation of β-xylanase activity, in decreasing order of amount, were xylobiose, xylotriose, xylose, and small amounts of xylotetraose. This pattern suggests that β-xylanase activity secreted by C. uda is of the endosplitting type. Supernatants of cultures grown on cellulose showed not only β-glucanase but also β-xylanase activity. The latter could be attributed to an endo-1,4-β-glucanase activity which had a low β-xylanase activity.

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Selected References

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