Applied Microbiology and Biotechnology

, Volume 94, Issue 4, pp 1095–1105 | Cite as

Characterization of the mitochondrial NAD+-dependent isocitrate dehydrogenase of the oleaginous yeast Rhodosporidium toruloides

  • Fan Yang
  • Sufang Zhang
  • Yongjin J. Zhou
  • Zhiwei Zhu
  • Xinping Lin
  • Zongbao K. Zhao
Applied microbial and cell physiology

Abstract

Early biochemical studies have demonstrated that lipid accumulation by oleaginous yeasts is linked to the activity of the NAD+-dependent isocitrate dehydrogenase (Idh). However, molecular study of Idh of oleaginous microorganisms remains limited. Here, we present the cloning of a mitochondrial NAD+-specific Idh from Rhodosporidium toruloides (RtIdh), an excellent microbial lipid producer that uses carbohydrates as the carbon source. The evolutionary relationship analyses among RtIdhs and other yeast Idhs revealed that RtIdh had a closer relationship with the Idhs of Ustilago maydis and Schizophyllum commune. We expressed the RtIDH gene in the yeast Saccharomyces cerevisiae idhΔ mutant. Under the nitrogen-limited condition, the intracellular lipid content and extracellular citrate concentration of the culture of the S. cerevisiae idhΔ carrying the RtIDH gene increased as the carbon/nitrogen molar ratio of the media increased, while the wild-type S. cerevisiae strain showed no correlation. Our data provided valuable information for elucidating the molecular mechanism of microbial oleaginicity and for engineering microorganisms to produce metabolites of fatty acid pathway.

Keywords

Rhodosporidium toruloides Microbial lipid NAD+-specific isocitrate dehydrogenase Nitrogen limitation Oleaginous yeast 

Notes

Acknowledgments

Financial supports provided by the Natural Sciences Foundation of China (31000052) and the Knowledge Innovation Program of CAS (KSCX2-EW-G-1-3) are greatly acknowledged.

Supplementary material

253_2011_3820_MOESM1_ESM.doc (356 kb)
ESM 1 (DOC 356 kb)

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Copyright information

© Springer-Verlag 2012

Authors and Affiliations

  • Fan Yang
    • 1
    • 2
  • Sufang Zhang
    • 1
  • Yongjin J. Zhou
    • 1
  • Zhiwei Zhu
    • 1
  • Xinping Lin
    • 1
  • Zongbao K. Zhao
    • 1
    • 3
  1. 1.Division of Biotechnology, Dalian Institute of Chemical Physics, CASDalianChina
  2. 2.School of Biological Engineering, Dalian Polytechnic UniversityDalianChina
  3. 3.Dalian National Laboratory for Clean EnergyDalianChina

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