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Mutants of the pentose-fermenting yeast Pachysolen tannophilus tolerant to hardwood spent sulfite liquor and acetic acid

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Abstract

A strain development program was initiated to improve the tolerance of the pentose-fermenting yeast Pachysolen tannophilus to inhibitors in lignocellulosic hydrolysates. Several rounds of UV mutagenesis followed by screening were used to select for mutants of P. tannophilus NRRL Y2460 with improved tolerance to hardwood spent sulfite liquor (HW SSL) and acetic acid in separate selection lines. The wild type (WT) strain grew in 50 % (v/v) HW SSL while third round HW SSL mutants (designated UHW301, UHW302 and UHW303) grew in 60 % (v/v) HW SSL, with two of these isolates (UHW302 and UHW303) being viable and growing, respectively, in 70 % (v/v) HW SSL. In defined liquid media containing acetic acid, the WT strain grew in 0.70 % (w/v) acetic acid, while third round acetic acid mutants (designated UAA301, UAA302 and UAA303) grew in 0.80 % (w/v) acetic acid, with one isolate (UAA302) growing in 0.90 % (w/v) acetic acid. Cross-tolerance of HW SSL-tolerant mutants to acetic acid and vice versa was observed with UHW303 able to grow in 0.90 % (w/v) acetic acid and UAA302 growing in 60 % (v/v) HW SSL. The UV-induced mutants retained the ability to ferment glucose and xylose to ethanol in defined media. These mutants of P. tannophilus are of considerable interest for bioconversion of the sugars in lignocellulosic hydrolysates to ethanol.

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Acknowledgments

This research was supported by the Natural Sciences and Engineering Research Council (NSERC) of Canada through the NSERC Bioconversion Network. We thank Dr. Cletus Kurtzman of USDA ARS Culture Collection (Peoria, Illinois, USA) for providing P. tannophilus NRRL Y2460 (WT) and Frank Giust of Tembec Inc. (Témiscaming, Québec, Canada) for providing the HW SSL.

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Authors and Affiliations

  1. School of Environmental Sciences, University of Guelph, Guelph, ON, N1G 2W1, Canada

    Nicole K. Harner, Paramjit K. Bajwa, Marc B. Habash, Jack T. Trevors & Hung Lee

  2. BP Biofuels, San Diego, CA, 92121, USA

    Glen D. Austin

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  1. Nicole K. Harner
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  2. Paramjit K. Bajwa
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  3. Marc B. Habash
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  4. Jack T. Trevors
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  5. Glen D. Austin
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  6. Hung Lee
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Correspondence to Hung Lee.

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Harner, N.K., Bajwa, P.K., Habash, M.B. et al. Mutants of the pentose-fermenting yeast Pachysolen tannophilus tolerant to hardwood spent sulfite liquor and acetic acid. Antonie van Leeuwenhoek 105, 29–43 (2014). https://doi.org/10.1007/s10482-013-0050-y

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