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. 1992 Jan;58(1):106–110. doi: 10.1128/aem.58.1.106-110.1992

Induction of Cellulase by Gentiobiose and Its Sulfur-Containing Analog in Penicillium purpurogenum

Takashi Kurasawa 1,†, Makoto Yachi 1,‡, Manabu Suto 1, Yoichi Kamagata 1,*, Shoichi Takao 1,§, Fusao Tomita 1
PMCID: PMC195179  PMID: 16348617

Abstract

Cellulase induction by β-glucodisaccharides was investigated by using non-cellulase-induced mycelia of Penicillium purpurogenum P-26, a highly-cellulase-producing fungus. Gentiobiose induced significant amounts of cellulase compared with cellobiose when nojirimycin was added to the induction medium to inhibit extracellular β-glucosidase activity. Thiogentiobiose (6-S-β-d-glucopyranosyl-6-thio-d-glucose), a sulfur-containing analog of gentiobiose, was more effective for cellulase induction than gentiobiose even in the absence of nojirimycin. Thiogentiobiose appeared to be a gratuitous inducer since it was not metabolized during cellulase induction. Gentiobiose was formed from cellobiose by the intracellular β-glucosidase of P. purpurogenum. These findings indicate that gentiobiose is an active inducer of cellulase for this fungus and may possibly be formed by intracellular β-glucosidase from cellobiose.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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