Phospholipase D (PLD) is a biocatalyst in the synthesis of bioactive compounds and a key enzyme in a variety of biological signal transductions. A combination of unnatural phosphatidyl acceptor, N,N,N-triethyl-N-2-hydroxyethylammonium bromide 6, as a substrate for PLD, and tandem electrospray ionization mass spectrometry (ESI MS) was found to provide information as to whether a given phospholipid serves as a substrate for the PLD-catalyzed reaction. Thus 2-(13′-hydroperoxy-octadecadienoyl)-1-palmitoylglycerophosphocholine 1, and its degradation products 2-(13′-oxo-octadecadienoyl)-1-palmitoylglycerophosphocholine 9 and 2-(13′-hydroxy-octadecadienoyl)-1-palmitoylglycerophosphocholine 11, in a mixture were found to be a substrate of the PLD-catalyzed transphosphatidylation. The sensitivity of this method was exemplified by the observation that PLD activity in cabbage leaves was detected using a small amount of crude crushed leaves with little pretreatment. This simple method can be used in screening for PLD activity and searching for inhibitors of the enzyme from various natural sources.
磷脂酶D(PLD)是一种
生物催化剂,参与
生物活性化合物的合成,并在多种
生物信号转导中起关键酶作用。通过结合使用非天然
磷脂酰受体,即N,N,N-三乙基-N-2-羟乙基
溴化铵6作为PLD的底物,以及串联电喷雾电离质谱(ESI MS),可以提供关于特定
磷脂是否作为PLD催化反应底物的信息。因此,2-(13′-羟过氧-十八碳二烯酰基)-1-棕榈酰
甘油磷酰
胆碱1及其降解产物2-(13′-氧代-十八碳二烯酰基)-1-棕榈酰
甘油磷酰
胆碱9和2-(13′-羟基-十八碳二烯酰基)-1-棕榈酰
甘油磷酰
胆碱11在混合物中发现作为PLD催化的转
磷脂酰反应的底物。该方法的灵敏度通过观察到使用少量未经精细处理的压碎卷心菜叶片即可检测到PLD活性而得到例证。这种简单方法可用于筛选PLD活性并从各种天然来源中寻找酶
抑制剂。