Journal
BIOTECHNOLOGY FOR BIOFUELS
Volume 7, Issue -, Pages -Publisher
BMC
DOI: 10.1186/1754-6834-7-110
Keywords
Glycerol-3-phosphate dehydrogenase; Glycerol; Diatom; Lipid
Funding
- National Science and Technology Program [2011BAD14B03]
- Department of Education of Guangdong [2013KJCX0024]
- Science and Technology Project of Guangdong [2010B030600005]
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Background: Microalgae are ideal raw materials for biodiesel and bioactive compounds. Glycerol-3-phosphate is formed from dihydroxyacetone phosphate (DHAP) through the glycolytic pathway catalyzed by glycerol-3-phosphate dehydrogenase (GPDH). Results: GPDH was characterized in the marine diatom Phaeodactylum tricornutum. In the GPDH-overexpressing P. tricornutum cells, the glycerol concentration per cell in the transformed diatom increased by 6.8-fold compared with the wild type, indicating that the overexpression of GPDH promoted the conversion of DHAP to glycerol-3-phosphate. There was a 60% increase in neutral lipid content, reaching 39.7% of dry cell weight in transgenic cells in the stationary phase, despite a 20% decrease in cell concentration. Fatty acid profiling showed that the levels of 16-and 18-carbon monounsaturated fatty acids significantly increased. Conclusion: GPDH had a significant impact on numerous metabolic processes in diatom cells, including the biosynthesis of glycerol and neutral lipids. These findings are instructive for the metabolic engineering of microalgae for biofuel production.
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