申请人:Molecular Probes, Inc.
公开号:US05576424A1
公开(公告)日:1996-11-19
The subject invention provides substrates useful for analyzing the metabolic activity in cells by improving the retention of a detectable reporter molecule only in intact cells where a particular enzyme is present. In particular, improved retention results from a two part process involving conjugation of haloalkyl-substituted derivatives of a reporter molecule with intracellular cysteine-containing peptides while unblocking the reporter molecule. The substrates have the form XR-SPACER-REPORTER-BLOCK wherein -BLOCK is a group selected to be removable by action of a specific analyte, to give REPORTER spectral properties different from those of the substrate, -REPORTER- is a molecule that, when no longer bound to BLOCK by a BLOCK-REPORTER bond, has spectral properties different from those of the substrate, -SPACER- is a covalent linkage, and XR- is a haloalkyl moiety that can covalently react with an intracellular thiol (Z-S-H) to form a thioether conjugate (Z-S-R-). After the substrate enters the cells, the analyte removes BLOCK to make REPORTER detectable by the change in spectral properties, and the haloalkyl XR reacts with the intracellular thiol to form the thioether conjugate inside the cells, which is well-retained in the cells.
该发明提供了用于分析细胞代谢活性的基质,通过改善仅在存在特定酶的完整细胞中保留可检测报告分子的能力。具体来说,改善的保留结果来自一个涉及将报告分子的卤代烷基衍生物与细胞内含半胱氨酸肽结合并解除报告分子的两部分过程。这些基质具有XR-SPACER-REPORTER-BLOCK的形式,其中-BLOCK是选择的可通过特定分析物作用去除的基团,以使REPORTER的光谱特性与基质不同,-REPORTER-是一种分子,当不再通过BLOCK-REPORTER键结合到BLOCK时,其光谱特性与基质不同,-SPACER-是一个共价连接,而XR-是一种卤代烷基基团,可以与细胞内巯基(Z-S-H)发生共价反应形成硫醚结合物(Z-S-R-)。在基质进入细胞后,分析物去除BLOCK,通过光谱特性的变化使REPORTER可检测,并且卤代烷基XR与细胞内巯基反应形成细胞内的硫醚结合物,这些结合物在细胞内得到良好保留。