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Suppression of ricinoleic acid toxicity by ptl2 overexpression in fission yeast Schizosaccharomyces pombe

  • Applied genetics and molecular biotechnology
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Abstract

We previously succeeded to obtain a high content of ricinoleic acid (RA), a hydroxylated fatty acid with great values as a petrochemical replacement, in fission yeast Schizosaccharomyces pombe by introducing Claviceps purpurea oleate Δ12-hydroxylase gene (CpFAH12). Although the production was toxic to S. pombe cells, we identified plg7, encoding phospholipase A2, as a multicopy suppressor that restored the growth defect by removing RA from phospholipids and induced secretion of a part of the released free RA into culture media. In this study, we extended our analysis and examined the effect of triglyceride (TG) lipase overexpression on the tolerance to RA toxicity and RA productivity. S. pombe has three TG lipase genes, ptl1, ptl2, and ptl3, which have high protein sequence similarities to each other and to Saccharomyces cerevisiae counterparts TGL3, TGL4, and TGL5, but only ptl2 overexpression suppressed the growth defect induced by RA production, and the culture grown at 20 °C secreted free RA into media like plg7 overexpression. Suppression by ptl2 was independent of plg7, and a large amount of free RA was accumulated in the cells concomitant with the decrease in RA moieties in phospholipids. Furthermore, the suppression by ptl2 was attenuated by bromoenol lactone (BEL), a phospholipase A2 specific inhibitor, suggesting that Ptl2p may have phospholipase activity. Simultaneous overexpression of ptl2 and plg7 in the FAH12 integrant increased secretion and intracellular accumulation of RA 1.2- and 1.3-fold, respectively, compared to those with single overexpression of plg7 on day 10 at 20 °C.

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Acknowledgments

Genomic DNA clones of S. pombe were provided by the National Bio-Resource Project (NBRP) of the MEXT, Japan. This work was partly supported by research grants from Noda Institute for Scientific Research and the New Energy and Industrial Technology Development Organization (NEDO) to HU.

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Correspondence to Hiroshi Uemura.

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Yazawa, H., Ogiso, M., Kumagai, H. et al. Suppression of ricinoleic acid toxicity by ptl2 overexpression in fission yeast Schizosaccharomyces pombe . Appl Microbiol Biotechnol 98, 9325–9337 (2014). https://doi.org/10.1007/s00253-014-6006-y

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  • DOI: https://doi.org/10.1007/s00253-014-6006-y

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