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Sucrose and overexpression of trehalose biosynthetic genes (otsBA) increase desiccation tolerance of recombinant Escherichia coli

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Abstract

Survival after desiccation was highest for recombinant strains of E. coli engineered to produce ethanol (KO11 and LY163) and lactate (TG106) when sucrose was provided as the fermentable sugar. Desiccation tolerance was lower with glucose and xylose. Further improvements in desiccation tolerance with sucrose were obtained by combining this with increased expression of otsBA genes encoding trehalose biosynthesis, removal of products from metabolism by resuspending in fresh medium, and harvesting cells prior to the end of log phase. With sucrose and otsBA expression, survivals of 20%–80% were readily achieved. Fermentation tests with EM2L, a derivative of LY163 expressing ostBA, demonstrated that ethanol production from seed fermentations begun with desiccated cells is equivalent to that of an undesiccated control.

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Acknowledgements

This research was supported by grants from the U.S. Department of Energy (FG02-96ER20222 and FG36-04GO14019), BioEnergy International, LLC, and Verenium Corp.

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  1. Department of Microbiology and Cell Science, University of Florida, Gainesville, FL, 32611, USA

    E. N. Miller & L. O. Ingram

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  1. E. N. Miller
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  2. L. O. Ingram
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Correspondence to L. O. Ingram.

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Miller, E.N., Ingram, L.O. Sucrose and overexpression of trehalose biosynthetic genes (otsBA) increase desiccation tolerance of recombinant Escherichia coli . Biotechnol Lett 30, 503–508 (2008). https://doi.org/10.1007/s10529-007-9573-5

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  • DOI: https://doi.org/10.1007/s10529-007-9573-5

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