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A novel biopesticide production: attagel-mediated precipitation of chitinase from Beauveria bassiana SFB-205 supernatant for thermotolerance

Insect killing fungi have high potential in controlling agriculturally harmful pest, but their slow progress and high variation in killing insect are major impediments to successful industrialization. The present work describes the use of supernatant from the liquid culture of Beauveria bassiana SFB...

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Published in:Applied microbiology and biotechnology 2010-08, Vol.87 (5), p.1639-1648
Main Authors: Kim, Jae Su, Je, Yeon Ho
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description Insect killing fungi have high potential in controlling agriculturally harmful pest, but their slow progress and high variation in killing insect are major impediments to successful industrialization. The present work describes the use of supernatant from the liquid culture of Beauveria bassiana SFB-205 to surmount this problem, particularly efficient production of thermotolerant chitinase, which is one of the major pathogenesis-related enzymes in the supernatant. The chitinase was precipitated using varying mineral precipitants and followed by lyophilization, which was compared with a salting out method using ammonium sulfate in effectiveness. Incorporating of the supernatant fraction of the Beauveria preparation with attagel at 0.5% ( w/v ) as a precipitant enabled this treatment to show the greatest chitinase-precipitation efficiency (93.4%), followed up with excellent insecticidal activity against cotton aphids when it was mixed with 0.01% ( v/v ) polyoxyethylene-(3)-isotridecyl ether (TDE-3) as a spreading agent in laboratory conditions. Consequently, lyophilized attagel-mediated precipitation pellet was superior to lyophilized salting out pellet in maintaining chitinase activity against a thermal stress at 50°C. This finding provides that the attagel-mediated precipitation can be exploited to improve the thermotolerance of B. bassiana SFB-205 chitinase as a novel strategy for biopesticide production.
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The present work describes the use of supernatant from the liquid culture of Beauveria bassiana SFB-205 to surmount this problem, particularly efficient production of thermotolerant chitinase, which is one of the major pathogenesis-related enzymes in the supernatant. The chitinase was precipitated using varying mineral precipitants and followed by lyophilization, which was compared with a salting out method using ammonium sulfate in effectiveness. Incorporating of the supernatant fraction of the Beauveria preparation with attagel at 0.5% ( w/v ) as a precipitant enabled this treatment to show the greatest chitinase-precipitation efficiency (93.4%), followed up with excellent insecticidal activity against cotton aphids when it was mixed with 0.01% ( v/v ) polyoxyethylene-(3)-isotridecyl ether (TDE-3) as a spreading agent in laboratory conditions. 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Consequently, lyophilized attagel-mediated precipitation pellet was superior to lyophilized salting out pellet in maintaining chitinase activity against a thermal stress at 50°C. 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subjects Agricultural biotechnology
Ammonium
Animals
Aphididae
Aphids - drug effects
Beauveria
Beauveria - enzymology
Beauveria bassiana
Biological and medical sciences
Biomedical and Life Sciences
Biopesticides
Biotechnological Products and Process Engineering
Biotechnology
Biotechnology - methods
Chemical Fractionation - methods
Chitinase
Chitinases - isolation & purification
Chitinases - pharmacology
Cotton
Efficiency
Enzyme Stability
Enzymes
Freeze Drying - methods
Fundamental and applied biological sciences. Psychology
Fungi
Glycerol
Insects
Killing
Laboratories
Life Sciences
Metabolites
Microbial Genetics and Genomics
Microbiology
Pathogenesis
Pellets
Pesticides
Pesticides - isolation & purification
Pesticides - pharmacology
Precipitation
Protein Stability
Proteins
Salting
Soil sciences
Studies
Survival Analysis
Temperature
Thermal stress
title A novel biopesticide production: attagel-mediated precipitation of chitinase from Beauveria bassiana SFB-205 supernatant for thermotolerance
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