申请人:Miles Laboratories, Inc.
公开号:US04404366A1
公开(公告)日:1983-09-13
An improved specific binding assay method and reagent for determining a ligand in a liquid medium employing, as an enzyme-cleavable substrate label, a residue having the formula: G--D--R wherein G is a glycone, D is a dye indicator moiety, and R is a linking group through which the label residue is covalently bound to a binding component of a conventional binding assay system, such as the ligand, an analog thereof, or a specific binding partner thereof. The monitored characteristic of the label is the release of a detectable product, usually a fluorogen or chromogen, upon enzymatic cleavage of the glycosidic linkage between the glycone and the dye indicator moiety. The assay method may follow a homogeneous or heterogeneous format. The preferred glycone is a .beta.-galactosyl group and the preferred dye indicator moiety is an umbelliferone residue. The improved assay is particularly suited to the determination of haptens, such as drugs, and antigenic proteins and polypeptides, including antibodies, following a homogeneous competitive binding assay format. CROSS-REFERENCE TO RELATED APPLICATION
本发明提供了一种改进的特异性结合测定方法和试剂,用于确定液体介质中的配体,采用可酶解底物标记作为酶可降解底物标记,该标记残基的公式为:G-D-R,其中G是糖基,D是染料指示基团,R是链接基团,通过该基团,标记残基与传统结合测定系统的结合组分,例如配体、其类似物或特异性结合伙伴,共价结合。标记的监测特征是在糖苷键和染料指示基团之间的酶解下释放可检测的产物,通常是荧光原或色原。该测定方法可以采用均相或非均相格式。首选的糖基是β-半乳糖基,首选的染料指示基团是芹菜素残基。该改进的测定方法特别适用于采用均相竞争结合测定格式测定半抗原、如药物和抗原蛋白和多肽,包括抗体。与相关申请的交叉引用。