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Increase in cellular triacylglycerol content and emergence of large ER-associated lipid droplets in the absence of CDP-DG synthase function.

He Y, Yam C, Pomraning K, Chin JS, Yew JY, Freitag M, Oliferenko S - Mol. Biol. Cell (2014)

Bottom Line: Understanding what determines the cellular amount of neutral lipids and their packaging into lipid droplets is of fundamental and applied interest.Using two species of fission yeast, we show that cycling cells deficient in the function of the ER-resident CDP-DG synthase Cds1 exhibit markedly increased triacylglycerol content and assemble large lipid droplets closely associated with the ER membranes.Our results suggest that interfering with the CDP-DG route of phosphatidic acid utilization rewires cellular metabolism to adopt a triacylglycerol-rich lifestyle reliant on the Kennedy pathway.

View Article: PubMed Central - PubMed

Affiliation: Temasek Life Sciences Laboratory, 117604 Singapore Department of Biological Sciences, National University of Singapore, 117543 Singapore.

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S. japonicus cds1bbl1 mutant cells exhibit significant increase in levels of diacylglycerols (DGs). (A) Results of mass spectrometry of total PA content in WT (blue) and bbl1 (red) mutant cells. (B) Results of mass spectrometry of total DG content in WT (blue) and bbl1 (red) mutant cells. (A, B) Cells grown in rich yeast extract–based medium. Error bars, SDs (n = 5).
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Figure 4: S. japonicus cds1bbl1 mutant cells exhibit significant increase in levels of diacylglycerols (DGs). (A) Results of mass spectrometry of total PA content in WT (blue) and bbl1 (red) mutant cells. (B) Results of mass spectrometry of total DG content in WT (blue) and bbl1 (red) mutant cells. (A, B) Cells grown in rich yeast extract–based medium. Error bars, SDs (n = 5).

Mentions: It was previously shown that the loss of the Cds1 function in budding yeast triggered an approximately twofold increase in the cellular amount of its substrate PA (Fei et al., 2011). We did not observe an increase in cellular PA levels in S. japonicus cells deficient in Cds1 function (Figure 4A). However, we detected a noticeable increase in the levels of diacylglycerols in these cells, likely due to rapid dephosphorylation of available PA (Figure 4B and Supplemental Figure S4).


Increase in cellular triacylglycerol content and emergence of large ER-associated lipid droplets in the absence of CDP-DG synthase function.

He Y, Yam C, Pomraning K, Chin JS, Yew JY, Freitag M, Oliferenko S - Mol. Biol. Cell (2014)

S. japonicus cds1bbl1 mutant cells exhibit significant increase in levels of diacylglycerols (DGs). (A) Results of mass spectrometry of total PA content in WT (blue) and bbl1 (red) mutant cells. (B) Results of mass spectrometry of total DG content in WT (blue) and bbl1 (red) mutant cells. (A, B) Cells grown in rich yeast extract–based medium. Error bars, SDs (n = 5).
© Copyright Policy - creative-commons
Related In: Results  -  Collection

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Figure 4: S. japonicus cds1bbl1 mutant cells exhibit significant increase in levels of diacylglycerols (DGs). (A) Results of mass spectrometry of total PA content in WT (blue) and bbl1 (red) mutant cells. (B) Results of mass spectrometry of total DG content in WT (blue) and bbl1 (red) mutant cells. (A, B) Cells grown in rich yeast extract–based medium. Error bars, SDs (n = 5).
Mentions: It was previously shown that the loss of the Cds1 function in budding yeast triggered an approximately twofold increase in the cellular amount of its substrate PA (Fei et al., 2011). We did not observe an increase in cellular PA levels in S. japonicus cells deficient in Cds1 function (Figure 4A). However, we detected a noticeable increase in the levels of diacylglycerols in these cells, likely due to rapid dephosphorylation of available PA (Figure 4B and Supplemental Figure S4).

Bottom Line: Understanding what determines the cellular amount of neutral lipids and their packaging into lipid droplets is of fundamental and applied interest.Using two species of fission yeast, we show that cycling cells deficient in the function of the ER-resident CDP-DG synthase Cds1 exhibit markedly increased triacylglycerol content and assemble large lipid droplets closely associated with the ER membranes.Our results suggest that interfering with the CDP-DG route of phosphatidic acid utilization rewires cellular metabolism to adopt a triacylglycerol-rich lifestyle reliant on the Kennedy pathway.

View Article: PubMed Central - PubMed

Affiliation: Temasek Life Sciences Laboratory, 117604 Singapore Department of Biological Sciences, National University of Singapore, 117543 Singapore.

Show MeSH