Medizinische Universität Graz - Research portal
Selected Publication:
SHR Neuro Cancer Cardio Lipid Metab Microb
Ploier, B; Scharwey, M; Koch, B; Schmidt, C; Schatte, J; Rechberger, G; Kollroser, M; Hermetter, A; Daum, G.
Screening for hydrolytic enzymes reveals Ayr1p as a novel triacylglycerol lipase in Saccharomyces cerevisiae.
J Biol Chem. 2013; 288(50):36061-36072
Doi: 10.1074/jbc.M113.509927
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- Co-authors Med Uni Graz
- Kollroser Manfred
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- Abstract:
- Saccharomyces cerevisiae, as well as other eukaryotes, preserves fatty acids and sterols in a biologically inert form, as triacylglycerols and steryl esters. The major triacylglycerol lipases of the yeast S. cerevisiae identified so far are Tgl3p, Tgl4p, and Tgl5p (Athenstaedt, K., and Daum, G. (2003) YMR313c/TGL3 encodes a novel triacylglycerol lipase located in lipid particles of Saccharomyces cerevisiae. J. Biol. Chem. 278, 23317-23323; Athenstaedt, K., and Daum, G. (2005) Tgl4p and Tgl5p, two triacylglycerol lipases of the yeast Saccharomyces cerevisiae, are localized to lipid particles. J. Biol. Chem. 280, 37301-37309). We observed that upon cultivation on oleic acid, triacylglycerol mobilization did not come to a halt in a yeast strain deficient in all currently known triacylglycerol lipases, indicating the presence of additional not yet characterized lipases/esterases. Functional proteome analysis using lipase and esterase inhibitors revealed a subset of candidate genes for yet unknown hydrolytic enzymes on peroxisomes and lipid droplets. Based on the conserved GXSXG lipase motif, putative functions, and subcellular localizations, a selected number of candidates were characterized by enzyme assays in vitro, gene expression analysis, non-polar lipid analysis, and in vivo triacylglycerol mobilization assays. These investigations led to the identification of Ayr1p as a novel triacylglycerol lipase of yeast lipid droplets and confirmed the hydrolytic potential of the peroxisomal Lpx1p in vivo. Based on these results, we discuss a possible link between lipid storage, lipid mobilization, and peroxisomal utilization of fatty acids as a carbon source.
- Find related publications in this database (using NLM MeSH Indexing)
- Biological Transport -
- Carboxylic Ester Hydrolases - genetics Carboxylic Ester Hydrolases - metabolism
- Culture Media - chemistry
- Gene Expression Regulation, Fungal -
- Hydrolysis -
- Lipase - genetics Lipase - metabolism
- Oleic Acid - analysis
- Saccharomyces cerevisiae - cytology Saccharomyces cerevisiae - enzymology Saccharomyces cerevisiae - genetics Saccharomyces cerevisiae - growth & development
- Saccharomyces cerevisiae Proteins - genetics Saccharomyces cerevisiae Proteins - metabolism
- Sugar Alcohol Dehydrogenases - metabolism
- Triglycerides - metabolism
- Find related publications in this database (Keywords)
- Lipase
- Lipids
- Lipid Droplets
- Peroxisomes
- Triacylglycerol
- Yeast