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Comment on "Revealing nature's cellulase diversity: the digestion mechanism of Caldicellulosiruptor bescii CelA".

Science (New York, N.Y.) (2014-05-09)
Alexander V Gusakov
ABSTRACT

Brunecky et al. (Reports, 20 December 2013, p. 1513) compared the cellulolytic activity of bacterial multimodular cellulase CelA with fungal Cel7A (cellobiohydrolase I from Trichoderma reesei). If more active Cel7A from another fungus were used as a reference enzyme under optimal conditions with β-glucosidase added, the reported difference between bacterial and fungal enzymes would be less dramatic.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Cellulase from Aspergillus niger, powder, off-white, ~0.8 U/mg
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Cellulase from Aspergillus sp., aqueous solution
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α-Cellulose, BioReagent, suitable for insect cell culture
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Cellulase from Aspergillus niger, powder, ≥0.3 units/mg solid
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Sigmacell Cellulose, Type 20, 20 μm
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Sigmacell Cellulose, Type 50, 50 μm
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Sigmacell Cellulose, Type 101, Highly purified, fibers
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Cellulase from Trichoderma reesei ATCC 26921, lyophilized powder, ≥1 unit/mg solid
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Cellulase from Trichoderma reesei, aqueous solution, ≥700 units/g
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Cellulose, microcrystalline, powder, 20 μm
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Avicel® PH-101, tested according to Ph. Eur.
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Cellulose, DS-0, powder, suitable for thin layer chromatography (TLC)
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Cellulose, acid washed, from spruce, for column chromatography
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