Cloning of beta-1,3-1,4-glucanase gene from Bacillus licheniformis EGW039 (CGMCC 0635) and its expression in Escherichia coli BL21 (DE3)

文献类型： 外文期刊

第一作者： Teng, Da

作者： Teng, Da;Wang, Jian-Hua;Fan, Ying;Yang, Ya-lin;Tian, Zi-gang;Luo, Jin;Yang, Guan-pin;Zhang, Fan

作者机构：

关键词： FIBROBACTER-SUCCINOGENES 1;3-1;4-BETA-D-GLUCANASE;SITE-DIRECTED MUTAGENESIS;ACTIVE-SITE;ENDO-BETA-1;3-1;4-GLUCANASE GENE;SACCHAROMYCES-CEREVISIAE;MOLECULAR-CLONING;BETA-GLUCANASES;SUBTILIS;XYLANASE;RESIDUES

期刊名称：APPLIED MICROBIOLOGY AND BIOTECHNOLOGY （ 影响因子：4.813； 五年影响因子：4.697 ）

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年卷期：

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收录情况： SCI

摘要： beta-1,3-1,4-Glucanase has been applied in the brewing and animal feed additive industry. It can effectively improve digestibility of barley-based diets and reduce enteritis. It also reduces viscosity during mashing for high-quality brewers malt. The aim of this work is to clone beta-1,3-1,4-glucanase-encoding gene and express it heterogeneously. The gene was amplified by polymerase chain reaction using Bacillus licheniformis genomic DNA as the template and ligated into the expression vector pET28a. The recombinant vector was transformed into Escherichia coli. The estimated molecular weight of the recombinant enzyme with a six-His tag at the N terminus was about 28 kDa, and its activities in cell lysate supernatant were 1,286 and 986 U ml(-1) for 1% (w/v) barley beta-glucan and 1% (w/v) lichenan, respectively. Accordingly, the specific activities were 2,479 and 1,906 U mg(-1) for these two substrates. The expression level of recombinant beta-1,3-1,4-glucanase was about 60.9% of the total protein and about 12.5% of the total soluble protein in crude cell lysate supernatant. Acidity and temperature optimal for this recombinant enzyme was pH 5.6 and 40 degrees C, respectively.

分类号： Q93

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