Abstract
Polylactic acid (PLA) is an important renewable polymer, but current processes for producing its precursor, lactic acid, suffer from process inefficiencies related to the use of bacterial hosts. Therefore, improving the capacity of Saccharomyces cerevisiae to produce lactic acid is a promising approach to improve industrial production of lactic acid. As one such improvement required, the lactic acid tolerance of yeast must be significantly increased. To enable improved tolerance, we employed an RNAi-mediated genome-wide expression knockdown approach as a means to rapidly identify potential genetic targets. In this approach, several gene knockdown targets were identified which confer increased acid tolerance to S. cerevisiae BY4741, of which knockdown of the ribosome-associated chaperone SSB1 conferred the highest increase (52 %). This target was then transferred into a lactic acid-overproducing strain of S. cerevisiae CEN.PK in the form of a knockout and the resulting strain demonstrated up to 33 % increased cell growth, 58 % increased glucose consumption, and 60 % increased l-lactic acid production. As SSB1 contains a close functional homolog SSB2 in yeast, this result was counterintuitive and may point to as-yet-undefined functional differences between SSB1 and SSB2 related to lactic acid production. The final strain produced over 50 g/L of lactic acid in under 60 h of fermentation.
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Abbreviations
- RNAi:
-
RNA interference
- LAB:
-
Lactic acid bacteria
- PLA:
-
Polylactic acid
- L-LDH:
-
l-Lactate dehydrogenase
- PDC:
-
Pyruvate decarboxylase
- SSB1:
-
Yeast cytoplasmic chaperone
- RPL14B:
-
Yeast ribosomal 60S subunit L41B
- ADH1:
-
Yeast alcohol dehydrogenase
- YSC:
-
Yeast synthetic complete medium
- HPLC:
-
High-performance liquid chromatography
- CYB2:
-
Yeast l-lactate cytochrome-c oxidoreductase
- GPD1:
-
Yeast glycerol-3-phosphate dehydrogenase
- PGK1:
-
Yeast phosphoglycerate kinase
- CCW12:
-
Yeast cell wall mannoprotein
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This work was funded in part by Samsung Electronics Co., Ltd. under the Global Research Outreach Program.
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N. C., J. S., and H. A. do not have any financial or personal relationships that could inappropriately influence or bias the content of the paper. J. L. is an employee of Samsung Corporation.
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J. J. Lee and N. Crook contributed equally to this work.
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Lee, J.J., Crook, N., Sun, J. et al. Improvement of lactic acid production in Saccharomyces cerevisiae by a deletion of ssb1 . J Ind Microbiol Biotechnol 43, 87–96 (2016). https://doi.org/10.1007/s10295-015-1713-7
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DOI: https://doi.org/10.1007/s10295-015-1713-7