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. 1990 May;56(5):1221–1228. doi: 10.1128/aem.56.5.1221-1228.1990

Cellulose digestion and cellulase regulation and distribution in Fibrobacter succinogenes subsp. succinogenes S85.

L Huang 1, C W Forsberg 1
PMCID: PMC184386  PMID: 2339881

Abstract

Fibrobacter succinogenes subsp. succinogenes S85 initiated growth on microcrystalline cellulose without a lag whether inoculated from a glucose, cellobiose, or cellulose culture. During growth on cellulose, there was no accumulation of soluble carbohydrate. When the growth medium contained either glucose or cellobiose in combination with microcrystalline cellulose, there was a lag in cellulose digestion until all of the soluble sugar had been utilized, suggesting an end product feedback mechanism that affects cellulose digestion. Cl-stimulated cellobiosidase and periplasmic cellodextrinase were produced under all growth conditions tested, indicating constitutive synthesis. Both cellobiosidases were cell associated until the stationary phase of growth, whereas proteins antigenically related to the Cl-stimulated cellobiosidase and a proportion of the endoglucanase were released into the extracellular culture fluid during growth, irrespective of the substrate. Immunoelectron microscopy of cells with a polyclonal antibody to Cl-stimulated cellobiosidase as the primary antibody and 10-nm-diameter gold particles conjugated to goat anti-rabbit antibodies as the second antibody revealed protrusions of the outer surface which were selectively labeled with gold, suggesting that Cl-stimulated cellobiosidase was located on the protrusions. These data support the contention that the protrusions have a role in cellulose hydrolysis; however, this interpretation is complicated by reactivity of the antibodies with a large number of other proteins that possess related antigenic epitopes.

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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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