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Elucidating β-1,3-Glucanase and Peroxidase Physicochemical Properties of Wheat Cell Wall Defense Mechanism Against Diuraphis noxia Infestation

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Specific and nonspecific glucanases from Trichoderma viride.

G Beldman¹, A G Voragen, F M Rombouts

¹Department of Food Science, Agricultural University, De Dreyen 12, 6703 BC Wageningen, The Netherlands.

Biotechnology and Bioengineering

|February 5, 1988

Summary

Certain Trichoderma viride cellulases, specifically endoglucanases IV-VI and exoglucanase I, exhibit xylanase activity, hydrolyzing beta-1,4-D-glucosidic linkages. Other tested enzymes were specific glucanases with no xylan activity.

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Area of Science:

Enzymology
Biochemistry
Microbiology

Background:

Commercial cellulase preparations from Trichoderma viride contain various enzymes.
Understanding enzyme specificity is crucial for industrial applications.

Purpose of the Study:

To investigate the substrate specificity of individual cellulases from T. viride.
To determine if any cellulases possess xylanolytic activity.

Main Methods:

Enzymes including endoglucanases (I-VI), exoglucanases (I-III), and beta-glucosidase (beta-gluc I) were isolated.
Enzyme activity was tested against xylan and other substrates.
Kinetic experiments were performed to analyze hydrolysis preferences.

Main Results:

Endoglucanases I-III and exoglucanases II-III were specific glucanases, showing no xylan activity.
Endoglucanases IV-VI, exoglucanase I, and beta-glucosidase I demonstrated xylanolytic activity.
Kinetic studies indicated a preference for beta-1,4-D-glucosidic linkages by endoglucanases IV-VI and exoglucanase I.

Conclusions:

Some T. viride cellulases possess broader substrate specificity, including xylan hydrolysis.
These xylanolytic cellulases align with the general classification of xylanases.
Enzyme specificity influences their potential applications in biomass degradation.