NUCLEOTIDE TRIPHOSPHATE WITH AN ELECTROACTIVE LABEL CONJUGATED TO THE GAMMA PHOSPHATE
申请人:Kraatz Heinz-Bernhard
公开号:US20110218114A1
公开(公告)日:2011-09-08
A nucleotide triphosphate (NTP) participates in a phosphorylation reaction, wherein a phosphate group is transferred from the NTP to a substrate by a kinase. Provision in a kinase reaction of a NTP whose gamma phosphate is conjugated to an electroactive label results in the transfer of the gamma phosphate-electroactive label conjugate from the NTP to the substrate. The electroactive label is an organic moiety such as a quinone or a nitroheterocycle, or is a metallocene such as a ferrocene or a cobaltocene. Upon transfer of the gamma phosphate-electroactive label conjugate to an electrode-bound substrate by a kinase, the phosphorylation event is detected electrochemically by cyclic voltammetry. Phosphorylation can also be detected by mass spectrometry of a substrate carrying the electroactive label-conjugated gamma phosphate. NTP comprising the gamma phosphate-electroactive label conjugate is used in methods of detecting the presence of a kinase in a sample, screening candidate compounds that modulate kinase activity, and in methods of diagnosing a disease associated with a kinase.
核苷酸三磷酸(NTP)参与磷酸化反应,其中通过激酶,将磷酸基从NTP转移至底物。在激酶反应中,提供一个将伽马磷酸酯化为电活性标记的NTP,结果将伽马磷酸酯-电活性标记共轭物从NTP转移至底物。电活性标记是一种有机基团,例如醌或硝基杂环,或是一种金属茂基,例如二茂铁或二茂钴。当伽马磷酸酯-电活性标记共轭物通过激酶转移至电极结合的底物时,通过循环伏安法可以电化学地检测到磷酸化事件。磷酸化还可以通过携带电活性标记共轭伽马磷酸酯的底物的质谱分析来检测。含有伽马磷酸酯-电活性标记共轭物的NTP用于检测样品中激酶的存在,筛选调节激酶活性的候选化合物,并用于诊断与激酶相关的疾病的方法。