4.7 Article

Production of Butanol Directly from Hemicellulose through Secretory Expression of a Xylanase in Clostridium acetobutylicum

期刊

ENERGY & FUELS
卷 34, 期 3, 页码 3376-3382

出版社

AMER CHEMICAL SOC
DOI: 10.1021/acs.energyfuels.9b04489

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资金

  1. National Key Research and Development Program of China [2018YFA0902200]
  2. National Natural Science Foundation of China [21706123]
  3. Key Program of the National Natural Science Foundation of China [21636003]
  4. Program for Changjiang Scholars and Innovative Research Team in University [IRT_14R28]
  5. Outstanding Youth Foundation of Jiangsu [SBK2017010373]

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Butanol is an attractive second-generation biofuel as well as an important chemical. Production of butanol from lignocellulosic feedstock via consolidated bioprocessing has attracted increasing interest in recent years. However, this has been limited by the inefficient degradation of extracellular polysaccharides in butanol-producing strains. In this study, production of butanol directly from hemicellulose was achieved simply through overexpression of an indigenous xylanase in Clostridium acetobutylicum. The xylanase (XynB) encoded by CA_P0053 was highly soluble and fully secreted from C. acetobutylicum. The extracellular xylanase activity was increased 88-fold, and 4.03 g/L biobutanol was obtained from hemicellulose, which has been the highest yield yet reported from either hemicellulose or xylan. This study proved that the solventogenic C. acetobutylicum had great potential for consolidated production of biofuels. Understanding and applying its secretion mechanism will be of great significance in the future.

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