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Engineering global transcription factor cyclic AMP receptor protein of Escherichia coli for improved 1-butanol tolerance

  • Bioenergy and biofuels
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Abstract

One major challenge in biofuel production, including biobutanol production, is the low tolerance of the microbial host towards increasing biofuel concentration during fermentation. Here, we have demonstrated that Escherichia coli 1-butanol tolerance can be greatly enhanced through random mutagenesis of global transcription factor cyclic AMP receptor protein (CRP). Four mutants (MT1–MT4) with elevated 1-butanol tolerance were isolated from error-prone PCR libraries through an enrichment screening. A DNA shuffling library was then constructed using MT1–MT4 as templates and one mutant (MT5) that exhibited the best tolerance ability among all variants was selected. In the presence of 0.8 % (v/v, 6.5 g/l) 1-butanol, the growth rate of MT5 was found to be 0.28 h−1 while that of wild type was 0.20 h−1. When 1-butanol concentration increased to 1.2 % (9.7 g/l), the growth rate of MT5 (0.18 h−1) became twice that of the wild type (0.09 h−1). Microbial adhesion to hydrocarbon test showed that cell surface of MT5 was less hydrophobic and its cell length became significantly longer in the presence of 1-butanol, as observed by scanning electron microscopy. Quantitative real-time reverse transcription PCR analysis revealed that several CRP regulated, 1-butanol stress response related genes (rpoH, ompF, sodA, manX, male, and marA) demonstrated differential expression in MT5 in the presence or absence of 1-butanol. In conclusion, direct manipulation of the transcript profile through engineering global transcription factor CRP can provide a useful tool in strain engineering.

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Acknowledgments

This work is supported by National Research Foundation, Singapore (NRF-CRP5-2009-03).

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  1. School of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive, Singapore, 637459, Singapore

    Hongfang Zhang, Huiqing Chong, Chi Bun Ching, Hao Song & Rongrong Jiang

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  1. Hongfang Zhang
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  2. Huiqing Chong
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Correspondence to Rongrong Jiang.

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Zhang, H., Chong, H., Ching, C.B. et al. Engineering global transcription factor cyclic AMP receptor protein of Escherichia coli for improved 1-butanol tolerance. Appl Microbiol Biotechnol 94, 1107–1117 (2012). https://doi.org/10.1007/s00253-012-4012-5

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