Exploiting nonionic surfactants to enhance fatty alcohol production in Rhodosporidium toruloides
- Department of Biomass Science and Conversion TechnologySandia National Laboratories Livermore California, Department of EnergyAgile BioFoundry Emeryville California
- QB3‐BerkeleyUniversity of California Berkeley California
- Department of EnergyAgile BioFoundry Emeryville California, Biological Systems and Engineering DivisionLawrence Berkeley National Laboratory Berkeley California, Advanced Biofuels and Bioproducts Process Development UnitLawrence Berkeley National Laboratory Emeryville California
- Department of Biomass Science and Conversion TechnologySandia National Laboratories Livermore California, Department of EnergyAgile BioFoundry Emeryville California, Joint BioEnergy Institute Emeryville California
Fatty alcohols (FOHs) are important feedstocks in the chemical industry to produce detergents, cosmetics, and lubricants. Microbial production of FOHs has become an attractive alternative to production in plants and animals due to growing energy demands and environmental concerns. However, inhibition of cell growth caused by intracellular FOH accumulation is one major issue that limits FOH titers in microbial hosts. In addition, identification of FOH-specific exporters remains a challenge and previous studies towards this end are limited. To alleviate the toxicity issue, we exploited nonionic surfactants to promote the export of FOHs in Rhodosporidium toruloides, an oleaginous yeast that is considered an attractive next-generation host for the production of fatty acid-derived chemicals. Our results showed FOH export efficiency was dramatically improved and the growth inhibition was alleviated in the presence of small amounts of tergitol and other surfactants. As a result, FOH titers increase by 4.3-fold at bench scale to 352.6 mg/L. With further process optimization in a 2-L bioreactor, the titer was further increased to 1.6 g/L. The method we show here can potentially be applied to other microbial hosts and may facilitate the commercialization of microbial FOH production.
- Sponsoring Organization:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Wind Energy Technologies Office
- Grant/Contract Number:
- AC04-94AL85000; AC02-05CH11231; NA0003525; NA0003525; AC02-05CH11231
- OSTI ID:
- 1599231
- Journal Information:
- Biotechnology and Bioengineering, Journal Name: Biotechnology and Bioengineering; ISSN 0006-3592
- Publisher:
- WileyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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