The present disclosure provides assays for lysosomal enzymes, specifically palmitoyl protein thioesterase 1 (PPT1) and tripeptidyl peptidase 1 (TPP1), using, for example, tandem mass spectrometry. The assays involve the detection of enzymatic products obtained through the action of the lysosomal enzymes on new enzyme substrates, and can be used for quantitative enzyme activity measurements. The assays for the enzymes utilize a minimum steps for sample work up and can be run in a simplex format or in a duplex format for the detection of neuronal ceroid lipofuscinoses, or in a multiplex format with other mass spectrometry-based assays for screening of neuronal ceroid lipofuscinoses and other lysosomal storage disorders.
本公开提供了溶酶体酶的检测方法,特别是棕榈酰蛋白
硫酯酶 1 (P
PT1) 和三肽基肽酶 1 (
TPP1),使用的方法包括串联质谱法等。这些检测方法包括检测溶酶体酶对新酶底物的作用所产生的酶产物,并可用于酶活性的定量测定。酶的检测只需最少的样品处理步骤,可采用单工或双工形式检测神经细胞类脂质病,或与其他基于质谱的检测方法一起采用多工形式筛查神经细胞类脂质病和其他溶酶体贮积症。