Phosphatidate phosphatase-1 is functionally conserved in lipid synthesis and storage from human to yeast.

Abstract

Phosphatidate phosphatase-1 (PAP1) enzymes (yeast Pah1p/Smp2p, mammalian lipin1-3) have a key role in lipid homeostasis by controlling the relative proportions of its substrate phosphatidate (PA) and its product diacylglycerol (DAG). Recent investigation shows that mammalian lipin-1 complements phenotypes exhibited by yeast pah1Δ mutant cells, which indicates the functions of PAP1 enzymes are evolutionarily conserved. The observation was confirmed after transformation of human LPIN1 into PAH1-defective yeast, which resulted in human LPIN1-induced accumulation of triacylglycerol (TAG )and lipid droplet formation. In double mutants lacking Tgl3p and Tgl4p, overexpression of PAH1 or LPIN1 induced TAG accumulation and excessive obesity. Furthermore, the obese yeast was used as a model to study the anti-obesity effects of PAP1 activity inhibitors, including propranolol and clenbuterol. The data showed that the inhibitors significantly suppressed TAG accumulation and lipid droplets formation. These findings demonstrate that LPIN1 plays a functional role in lipid synthesis and storage, a role which is highly conserved from human to yeast. Inhibition of TAG synthesis will become an efficacious treatment strategy for obesity and our excessive obesity model will provide a very useful tool for discovery of new anti-obesity drugs in the future.

• Authors: Zhijia Fang, Song Wang, Xiuxiu Du, Ping Shi, Zhiwei Huang
• Journal: Acta biologica Hungarica (Acta Biol Hung) Vol. 65 Issue 4 Pg. 481-92 (Dec 2014) ISSN: 0236-5383 [Print] Hungary
• PMID: 25475986 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• Anti-Obesity Agents
• Enzyme Inhibitors
• Pancreatitis-Associated Proteins
• Phospholipids
• REG3A protein, human
• Saccharomyces cerevisiae Proteins
• Triglycerides
• Lipase
• TGL3 protein, S cerevisiae
• Tgl4 protein, S cerevisiae
• LPIN1 protein, human
• PAH1 protein, S cerevisiae
• Phosphatidate Phosphatase

Topics

• Anti-Obesity Agents (pharmacology)
• Enzyme Inhibitors (pharmacology)
• Humans
• Lipase (genetics, metabolism)
• Lipogenesis (drug effects)
• Mutation
• Pancreatitis-Associated Proteins
• Phosphatidate Phosphatase (antagonists & inhibitors, genetics, metabolism)
• Phospholipids (metabolism)
• Saccharomyces cerevisiae (drug effects, enzymology, genetics)
• Saccharomyces cerevisiae Proteins (antagonists & inhibitors, genetics, metabolism)
• Triglycerides (metabolism)