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. 1984 May;47(5):1039–1046. doi: 10.1128/aem.47.5.1039-1046.1984

Characterization of the cellulolytic activity of a Bacillus isolate.

L M Robson, G H Chambliss
PMCID: PMC240050  PMID: 6742822

Abstract

A group I Bacillus strain, DLG, was isolated and characterized as being most closely related to Bacillus subtilis. When grown on any of a variety of sugars, the culture supernatant of this isolate was found to possess cellulolytic activity, as demonstrated by degradation of trinitrophenyl-carboxymethyl cellulose. Growth in medium containing cellobiose or glucose resulted in the greatest production of cellulolytic activity. The cellulolytic activity was not produced until the stationary phase of growth, and the addition of glucose or cellobiose to a culture in this phase had no apparent effect on enzyme production. Fractionation of the culture supernatant showed that the molecular weight of the enzymatic activity was less than 100,000. Maximum cellulolytic activity in assays was observed at pH 4.8 and at 58C, although maximum thermal stability of the activity. Kinetic experiments suggested that more than one enzyme was acting upon trinitrophenyl-carboxymethyl cellulose. Exocellular protein produced by this Bacillus isolate showed roughly one-fifth the cellulolytic activity displayed by Trichoderma reesei C30 on noncrystalline, cellulosic substrates. In contrast to T. reesei cellulase, the Bacillus enzymatic activity showed no ability to degrade crystalline forms of cellulose, nor was cellobiase activity detectable.

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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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