Purification and characterizations of a novel recombinant Bacillus velezensis endoglucanase by aqueous two-phase system View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2018-12

AUTHORS

Yang Liu, Haipeng Guo, Yanwen Wu, Wensheng Qin

ABSTRACT

Cellulases played an important role in the production of bioenergy and bio-products. Cellulases from bacteria with some special characteristics drew great attention due to its fast growth speed, wide adaption to harsh environment, and production of multi-function cellulases. An endoglucanase gene egls from Bacillus velezensis A4 was cloned and expressed in Escherichia coli BL21 (DE3). The recombinant enzyme Egls was partially purified using aqueous two-phase system. The highest recovery rate of the enzyme was 90.39% at PEG 4000 (25% w/w), phosphate buffer 8.08% (w/w) (pH 6.0), and NaCl (5% w/w). The enzyme molecular weight was 55 KD estimated by zymogram. The optimal pH and temperature of recombinant enzyme Egls were pH 6.0 and 55 °C, respectively. The enzyme was stable at pH range of 5.0–7.0 at 55 °C for 60 min. The enzyme exhibited Km, Vmax, Kcat values as 63.38 mg/ml, 55.6 mg/min, and 3.93 × 103/S, respectively. The addition of 10 mM of Mg2+, Mn2+, or 5% (w/w) of Triton-X 100 in the reaction system enhanced the enzyme activity significantly. The enzyme showed both endoglucanase and exoglucanase activity. An endoglucanase gene egls from B. velezensis A4 was cloned and expressed in E. coli BL21 (DE3). The recombinant enzyme Egls was purified by aqueous two-phase system and characterized. The enzyme can be applied for the efficient pretreatment of lignocellulosic biomass for bioenergy and bio-products production. More... »

PAGES

19

Identifiers

URI

http://scigraph.springernature.com/pub.10.1186/s40643-018-0204-x

DOI

http://dx.doi.org/10.1186/s40643-018-0204-x

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44 schema:description Cellulases played an important role in the production of bioenergy and bio-products. Cellulases from bacteria with some special characteristics drew great attention due to its fast growth speed, wide adaption to harsh environment, and production of multi-function cellulases. An endoglucanase gene egls from Bacillus velezensis A4 was cloned and expressed in Escherichia coli BL21 (DE3). The recombinant enzyme Egls was partially purified using aqueous two-phase system. The highest recovery rate of the enzyme was 90.39% at PEG 4000 (25% w/w), phosphate buffer 8.08% (w/w) (pH 6.0), and NaCl (5% w/w). The enzyme molecular weight was 55 KD estimated by zymogram. The optimal pH and temperature of recombinant enzyme Egls were pH 6.0 and 55 °C, respectively. The enzyme was stable at pH range of 5.0–7.0 at 55 °C for 60 min. The enzyme exhibited Km, Vmax, Kcat values as 63.38 mg/ml, 55.6 mg/min, and 3.93 × 103/S, respectively. The addition of 10 mM of Mg2+, Mn2+, or 5% (w/w) of Triton-X 100 in the reaction system enhanced the enzyme activity significantly. The enzyme showed both endoglucanase and exoglucanase activity. An endoglucanase gene egls from B. velezensis A4 was cloned and expressed in E. coli BL21 (DE3). The recombinant enzyme Egls was purified by aqueous two-phase system and characterized. The enzyme can be applied for the efficient pretreatment of lignocellulosic biomass for bioenergy and bio-products production.
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