The present invention provides a screening method for a compound inhibiting a transmembrane enzyme activity by binding to a transmembrane region of the enzyme, characterized by using (a) a protein having a part or all of an amino acid sequence of the enzyme, comprising a region comprising an active center and a part or all of a transmembrane region of the transmembrane enzyme, and optionally (b) a protein having a part of an amino acid sequence of the transmembrane enzyme, comprising the region comprising the active center and lacking the above-mentioned part or all of the transmembrane region, and measuring the binding of a test substance to each protein and the enzyme activity of each protein, as well as a kit for screening comprising the above-mentioned protein of (a) and (b). Also, the present invention provides a β-secretase selective inhibitor comprising a β-secretase inhibiting substance binding to a transmembrane region of the enzyme, and particularly an inhibitor for prophylaxis and/or treatment of Alzheimer's disease, Down syndrome or Age-Associated Memory Impairment.
本发明提供了一种通过与跨膜酶的跨膜区结合来抑制该酶活性的化合物的筛选方法,其特征在于使用(a)具有该酶的部分或全部
氨基酸序列的蛋白质,该蛋白质包括由活性中心和跨膜酶的部分或全部跨膜区组成的区域、和可选的(b)具有跨膜酶的部分
氨基酸序列的蛋白质,包括由活性中心组成的区域和缺少上述部分或全部跨膜区域,测量测试物质与每种蛋白质的结合和每种蛋白质的酶活性,以及包括上述(a)和(b)的蛋白质的筛选试剂盒。另外,本发明还提供了一种β-分泌酶选择性
抑制剂,该
抑制剂包括与酶的跨膜区结合的β-分泌酶抑制物质,特别是一种用于预防和/或治疗阿尔茨海默病、唐氏综合征或年龄相关记忆损伤的
抑制剂。