A method for determining the activity of a cell cycle regulatory factor comprising the steps of:
preparing a sample for measuring a cyclin-dependent kinase/cyclin complex from living cells;
reacting adenosine 5'-O-(3-thiotriphosphate) (ATP-γ S) with a substrate for the cyclin-dependent kinase in presence of the sample in order to introduce a monothiophosphate group into a serine or threonine residue of the substrate;
labeling the substrate by coupling a labeling fluorophore or a labeling enzyme with a sulfur atom of the introduced monothiophosphate group;
measuring the amount of fluorescence from the labeling fluorophore labeling the substrate, or reacting the labeling enzyme labeling the substrate with a substance which generates an optically detectable product by reaction with the labeling enzyme and optically measuring the amount of the generated product; and
calculating the activity of the cyclin-dependent kinase from the measured amount of fluorescence or the measured amount of the generated product with reference to a pre-produced reference curve.
一种确定细胞周期调节因子活性的方法,包括以下步骤
从活细胞中制备用于测量细胞周期蛋白依赖性激酶/细胞周期蛋白复合物的样品;
在样品存在的情况下,使
腺苷 5'-O-(3-
硫代
三磷酸)(
ATP-γ S)与细胞周期蛋白依赖性激酶的底物反应,以将单
硫代磷酸基团引入底物的
丝氨酸或苏
氨酸残基中;
通过将标记荧光团或标记酶与引入的单
硫代磷酸基团的
硫原子偶联,对底物进行标记;
测量标记底物的标记荧光团发出的荧光量,或将标记底物的标记酶与一种物质反应,该物质通过与标记酶反应生成可光学检测的产物,并光学测量生成产物的量;以及
根据测量到的荧光量或测量到的生成物量,参照预先制作的参考曲线,计算细胞周期蛋白依赖性激酶的活性。