1887

Abstract

A sp. isolated from compost degraded the hemicellulose fraction of straw efficiently but apparently not native cellulose. Ball-milled straw induced endoglucanase, β-glucosidase, β-xylanase and β-xylosidase. Carboxymethylcellulose, cellotetraose and cellotriose induced cellulolytic enzymes specifically whereas cellobiose acted as inducer for β-glucosidase only. Cellotriose and cellotetraose induced β-glucosidase, but only partially induced endoglucanase. Hemicellulose (in the form of xylan) and xylobiose induced only β-xylanase and β-xylosidase. Kraft lignin and syringic acid induced β-xylanase and endoglucanase but not the other enzymes. 3,4-Dimethoxycinnamic acid slightly induced β-xylanase whereas 3,5-dimethoxy-4-hydroxycinnamic acid specifically induced endoglucanase. Neither veratric acid nor vanillic and ferulic acids induced any of the cellulolytic or hemicellulolytic enzymes. Enzyme production was subject to a form of carbon catabolite repression. Endoglucanase and β-xylanase were excreted into the culture medium. Four protein components, one acidic (pI 5.2) and three basic (pI 8.15, 8.45 and 8.65) exhibited β-xylanase activity. Two acidic components (pI 3.55 and 3.75) displayed endoglucanase activity.

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/content/journal/micro/10.1099/00221287-135-2-285
1989-02-01
2019-10-18
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http://instance.metastore.ingenta.com/content/journal/micro/10.1099/00221287-135-2-285
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