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Background  Sugar alcohols are commonly used as low-calorie sweeteners and can serve as potential building blocks for bio-based chemicals. Previous work has shown that the oleaginous yeast  Rhodosporidium toruloides  IFO0880 can natively produce arabitol from xylose at relatively high titers, suggesting that it may be a useful host for sugar alcohol production. In this work, we explored whether  R. toruloides  can produce additional sugar alcohols.    Results   Rhodosporidium toruloides  is able to produce galactitol from galactose. During growth in nitrogen-rich medium,  R. toruloides  produced 3.2 ± 0.6 g/L, and 8.4 ± 0.8 g/L galactitol from 20 to 40 g/L galactose, respectively. In addition,  R. toruloides  was able to produce galactitol from galactose at reduced titers during growth in nitrogen-poor medium, which also induces lipid production. These results suggest that  R. toruloides  can potentially be used for the co-production of lipids and galactitol from galactose. We further characterized the mechanism for galactitol production, including identifying and biochemically characterizing the critical aldose reductase. Intracellular metabolite analysis was also performed to further understand galactose metabolism.    Conclusions   Rhodosporidium toruloides  has traditionally been used for the production of lipids and lipid-based chemicals. Our work demonstrates that  R. toruloides  can also produce galactitol, which can be used to produce polymers with applications in medicine and as a precursor for anti-cancer drugs. Collectively, our results further establish that  R. toruloides  can produce multiple value-added chemicals from a wide range of sugars.

Production of galactitol from galactose by the oleaginous yeast Rhodosporidium toruloides IFO0880