Recombinant PNPLA1 catalyzes the synthesis of acylceramides and acyl acids with selective incorporation of linoleic acid
作者:Jason M. Meyer、William E. Boeglin、Alan R. Brash
DOI:10.1016/j.jlr.2023.100379
日期:2023.6
acyl acid, respectively, albeit with only ∼0.05% conversion of the substrates. Notably, in experiments comparing dilinolein vs. diolein acyl donors, PNPLA1 transferred linoleate with 3:1 selectivity over oleate into acylceramide. These results support the role for PNPLA1 in the synthesis of acylceramides and acyl acids in epidermis and suggest that the enrichment of these lipids with linoleic acid
含马铃薯蛋白样磷脂酶结构域的蛋白 1 (PNPLA1) 的功能丧失突变会导致常染色体隐性遗传先天性鱼鳞病,PNPLA1 活性的改变与特应性皮炎和其他常见皮肤病的发病机制有关。为了验证 PNPLA1 催化酰基神经酰胺和酰基酸合成的假设,我们在大肠杆菌中表达并部分纯化了可溶性截短形式的 PNPLA1 (PNPLA1trun) 以及相关蛋白 PNPLA2(ATGL,脂肪甘油三酯脂肪酶)和共激活剂 CGI -58。将脂质体底物与重组酶一起孵育0.5-24小时,并通过HPLC-UV和LC-MS分析产物。使用三亚油酸酯或二亚油酸酯底物,PNPLA1trun 与 ATGLtrun 一样,催化脂肪分解和酰基转移酶反应,2-30% 转化为亚油酸、单亚油酸酯和三亚油酸酯。如先前报道,CGI-58 增强 ATGL 催化的脂肪分解,但 ATGL 或 PNPLA1 并未增强转酰基酶活性。为了匹配体内提议的活性,PN