Functional Analysis of the Purified Anandamide-generating Phospholipase D as a Member of the Metallo-β-lactamase Family
作者:Jun Wang、Yasuo Okamoto、Jun Morishita、Kazuhito Tsuboi、Akira Miyatake、Natsuo Ueda
DOI:10.1074/jbc.m512359200
日期:2006.5
recombinant NAPE-PLD in Escherichia coli and highly purified it. The purified enzyme was remarkably activated in a dose-dependent manner by millimolar concentrations of Mg2+ as well as Ca2+ and, hence, appeared to be constitutively active. The enzyme showed extremely high specificity for NAPEs among various glycerophospholipids but did not reveal obvious selectivity for different long chain or medium chain N-acyl
在动物组织中,通过催化属于金属β-内酰胺酶家族的特定磷脂酶D(NAPE-PLD),由其相应的N-酰基磷脂酰乙醇胺(NAPE)形成了包括内源性大麻素anandamide在内的生物活性N-酰基乙醇胺。尽管其潜在的生理重要性,但NAPE-PLD尚未通过纯化的酶制剂进行表征。在本研究中,我们在大肠杆菌中表达了重组NAPE-PLD,并对其进行了高度纯化。纯化的酶被毫摩尔浓度的Mg2 +以及Ca2 +以剂量依赖性方式显着激活,因此似乎具有组成性活性。该酶对各种甘油磷脂之间的NAPEs表现出极高的特异性,但对不同的NAPEs长链或中链N-酰基物种没有明显的选择性。这些结果表明NAPE-PLD降解不同NAPE的能力而不会损害其他膜磷脂。金属分析表明,NAPE-PLD中存在催化重要的锌。此外,定点诱变研究针对NAPE-PLD的几个组氨酸和天冬氨酸残基,这些残基在金属β-内酰胺酶家族中高度保守。Asp-147