Production and Characterization of Organic Solvent-Tolerant Cellulase from Bacillus amyloliquefaciens AK9 Isolated from Hot Spring

A cellulase-producing bacterium, designated as strain AK9, was isolated from a hot spring of Tatta Pani, Azad Kashmir, Pakistan. The bacterium was identified as Bacillus amyloliquefaciens through 16S rRNA sequencing. Cellulase from strain AK9 was able to liberate glucose from soluble cellulose and c...

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Veröffentlicht in:Applied biochemistry and biotechnology 2017-08, Vol.182 (4), p.1390-1402
Hauptverfasser: Irfan, Muhammad, Tayyab, Ammara, Hasan, Fariha, Khan, Samiullah, Badshah, Malik, Shah, Aamer Ali
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container_issue 4
container_start_page 1390
container_title Applied biochemistry and biotechnology
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creator Irfan, Muhammad
Tayyab, Ammara
Hasan, Fariha
Khan, Samiullah
Badshah, Malik
Shah, Aamer Ali
description A cellulase-producing bacterium, designated as strain AK9, was isolated from a hot spring of Tatta Pani, Azad Kashmir, Pakistan. The bacterium was identified as Bacillus amyloliquefaciens through 16S rRNA sequencing. Cellulase from strain AK9 was able to liberate glucose from soluble cellulose and carboxymethyl cellulose (CMC). Enzyme was purified through size exclusion chromatography and a single band of ∼47 kDa was observed on sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE). The enzyme was purified with recovery of 35.5%, 3.6-fold purity with specific activity of 31 U mg −1 . The purified cellulase retained its activity over a wide range of temperature (50–70 °C) and pH (3–7) with maximum stability at 60 °C and pH 5.0. The activity inhibited by ethylenediaminetetraacetic acid (EDTA), suggested that it was metalloenzyme. Diethyl pyrocarbonate (DEPC) and β-mercaptoethanol significantly inhibited cellulase activity that revealed the essentiality of histidine residues and disulfide bonds for its catalytic function. It was stable in non-ionic surfactants, in the presence of various metal ions, and in water-insoluble organic solvents. Approximately 9.1% of reducing sugar was released after enzymatic saccharification of DAP-pretreated agro-residue, compared to a very low percentage by autohydrolysis treatment. Hence, it is concluded that cellulase from B. amyloliquefaciens AK9 can potentially be used in bioconversion of lignocellulosic biomass to fermentable sugars.
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The bacterium was identified as Bacillus amyloliquefaciens through 16S rRNA sequencing. Cellulase from strain AK9 was able to liberate glucose from soluble cellulose and carboxymethyl cellulose (CMC). Enzyme was purified through size exclusion chromatography and a single band of ∼47 kDa was observed on sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE). The enzyme was purified with recovery of 35.5%, 3.6-fold purity with specific activity of 31 U mg −1 . The purified cellulase retained its activity over a wide range of temperature (50–70 °C) and pH (3–7) with maximum stability at 60 °C and pH 5.0. The activity inhibited by ethylenediaminetetraacetic acid (EDTA), suggested that it was metalloenzyme. Diethyl pyrocarbonate (DEPC) and β-mercaptoethanol significantly inhibited cellulase activity that revealed the essentiality of histidine residues and disulfide bonds for its catalytic function. 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It was stable in non-ionic surfactants, in the presence of various metal ions, and in water-insoluble organic solvents. Approximately 9.1% of reducing sugar was released after enzymatic saccharification of DAP-pretreated agro-residue, compared to a very low percentage by autohydrolysis treatment. 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subjects Bacillus amyloliquefaciens - growth & development
Bacillus amyloliquefaciens - isolation & purification
Bacillus amyloliquefaciens - metabolism
Bacteria
Biochemistry
Bioconversion
Biomass
Biotechnology
Carboxymethyl cellulose
Carboxymethylcellulose
Catalysis
Cellulase
Cellulase - biosynthesis
Cellulase - isolation & purification
Cellulase - metabolism
Cellulose
Chelating Agents - pharmacology
Chemical bonds
Chemistry
Chemistry and Materials Science
Culture Techniques
Disulfide bonds
Edetic acid
Enzyme Stability - drug effects
Enzymes
Ethylenediaminetetraacetic acids
Gel electrophoresis
Glucose
Histidine
Hot springs
Hot Springs - microbiology
Hydrogen-Ion Concentration
Hydrolysis
Industry
Ions
Lignocellulose
Lymphocytes B
Metal ions
Metals - pharmacology
Organic chemicals
Organic Chemicals - pharmacology
Organic solvents
Residues
rRNA 16S
Saccharification
Size exclusion chromatography
Sodium dodecyl sulfate
Sodium lauryl sulfate
Solvents
Solvents - pharmacology
Sugar
Surface-Active Agents - pharmacology
Surfactants
Temperature
Temperature effects
title Production and Characterization of Organic Solvent-Tolerant Cellulase from Bacillus amyloliquefaciens AK9 Isolated from Hot Spring
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