Metabolomics annotates ABHD3 as a physiologic regulator of medium-chain phospholipids
作者:Jonathan Z Long、Justin S Cisar、David Milliken、Sherry Niessen、Chu Wang、Sunia A Trauger、Gary Siuzdak、Benjamin F Cravatt
DOI:10.1038/nchembio.659
日期:2011.11
An untargeted metabolomics approach identifies C14 phosphatidylcholines (PCs) as specific cellular medium-chain substrates of the lipase ABHD3, as well as C5âC8 short-chain PCs including oxidized pro-atherosclerotic and pro-apoptotic PC phospholipids. All organisms, including humans, possess a huge number of uncharacterized enzymes. Here we describe a general cell-based screen for enzyme substrate discovery by untargeted metabolomics and its application to identify the protein α/β-hydrolase domainâcontaining 3 (ABHD3) as a lipase that selectively cleaves medium-chain and oxidatively truncated phospholipids. Abhd3â/â mice possess elevated myristoyl (C14)-phospholipids, including the bioactive lipid C14-lysophosphatidylcholine, confirming the physiological relevance of our substrate assignments.
一种非靶向代谢组学方法发现,C14磷脂酰胆碱(PC)是脂肪酶ABHD3的特异性细胞中链底物,还发现了C5âC8短链PC,包括氧化的促动脉粥样硬化和促凋亡PC磷脂。 包括人类在内的所有生物体都拥有大量未定性的酶。在这里,我们描述了一种通过非靶向代谢组学发现酶底物的通用细胞筛选方法,以及该方法在鉴定含δ/δ²-水解酶结构域的蛋白δ/δ²-水解酶结构域3(ABHD3)的应用,该蛋白δ/δ²-水解酶结构域3(ABHD3)是一种选择性裂解中链和氧化截短磷脂的脂肪酶。ABHD3â/â小鼠的肉豆蔻酰(C14)-磷脂含量升高,其中包括生物活性脂质C14-赖磷脂酰胆碱,这证实了我们底物分配的生理相关性。