The yeast lipin orthologue Pah1p is important for biogenesis of lipid droplets

Oludotun Adeyo, Patrick J. Horn, SungKyung Lee, Derk D. Binns, Anita Chandrahas, Kent D. Chapman, Joel M. Goodman

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150 Scopus citations

Abstract

Lipins are phosphatidate phosphatases that generate diacylglycerol (DAG). In this study, we report that yeast lipin, Pah1p, controls the formation of cytosolic lipid droplets. Disruption of PAH1 resulted in a 63% decrease in droplet number, although total neutral lipid levels did not change. This was accompanied by an accumulation of neutral lipids in the endoplasmic reticulum (ER). The droplet biogenesis defect was not a result of alterations in neutral lipid ratios. No droplets were visible in the absence of both PAH1 and steryl acyltransferases when grown in glucose medium, even though the strain produces as much triacylglycerol as wild type. The requirement of PAH1 for normal droplet formation can be bypassed by a knockout of DGK1. Nem1p, the activator of Pah1p, localizes to a single punctum per cell on the ER that is usually next to a droplet, suggesting that it is a site of droplet assembly. Overall, this study provides strong evidence that DAG generated by Pah1p is important for droplet biogenesis.

Original languageEnglish (US)
Pages (from-to)1043-1055
Number of pages13
JournalJournal of Cell Biology
Volume192
Issue number6
DOIs
Publication statusPublished - Mar 21 2011

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ASJC Scopus subject areas

  • Cell Biology

Cite this

Adeyo, O., Horn, P. J., Lee, S., Binns, D. D., Chandrahas, A., Chapman, K. D., & Goodman, J. M. (2011). The yeast lipin orthologue Pah1p is important for biogenesis of lipid droplets. Journal of Cell Biology, 192(6), 1043-1055. https://doi.org/10.1083/jcb.201010111