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Extracellular Secretion of β-glucosidase in Ethanologenic E. coli Enhances Ethanol Fermentation of Cellobiose

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Abstract

Consolidated bioprocessing of lignocellulose for ethanol production is realized by expressing cellulase enzymes on ethanologenic strain. In this study, an ethanologenic Escherichia coli ZY81 was constructed by integrating pyruvate decarboxylase gene pdc and alcohol dehydrogenase gene adhB from Zymomonas mobilis into the genome of E. coli JM109 to obtain the capability of ethanol production. Then, the β-glucosidase gene bglB from Bacillus polymyxa was cloned and secretively expressed in E. coli ZY81. The recombinant strain E. coli ZY81/bglB showed an obvious activity of β-glucosidase in extracellular location with more than half in periplasmic space. EDTA was found to promote the release of the periplasmic proteins by approximately tenfold. E. coli ZY81/bglB utilized cellobiose as sole carbon source for ethanol production with 33.99 % of theoretical yield.

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Authors and Affiliations

  1. State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237, China

    Zichen Luo, Yao Zhang & Jie Bao

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  1. Zichen Luo
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  2. Yao Zhang
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  3. Jie Bao
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Correspondence to Jie Bao.

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Luo, Z., Zhang, Y. & Bao, J. Extracellular Secretion of β-glucosidase in Ethanologenic E. coli Enhances Ethanol Fermentation of Cellobiose. Appl Biochem Biotechnol 174, 772–783 (2014). https://doi.org/10.1007/s12010-014-1108-7

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  • DOI: https://doi.org/10.1007/s12010-014-1108-7

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