申请人:ThermoGen, Inc.
公开号:US20020177180A1
公开(公告)日:2002-11-28
Provided herein is a method for the quantitative screening of hydrolase for desired substrate activity using pH indicators which are sensitive to the release of protons from a chemical reaction in a reaction mixture. The method comprises selecting buffer and indicator conditions such that both have the same affinity for protons such that the relative amount of buffer protonated is proportional to the amount of indicator protonated as the pH of the reaction mixture shifts. A reaction mixture is then prepared comprising a buffer, indicator, hydrolase to be tested, and desired substrate to be tested, allowing the hydrolase to react with the substrate. The reaction is monitored by detection of change in color of the reaction mixture, determined by the affect of the reaction on the indicator.
本文提供了一种利用 pH 指示剂定量筛选水解酶所需底物活性的方法,pH 指示剂对反应混合物中化学反应释放的质子敏感。该方法包括选择缓冲液和指示剂条件,使两者对质子具有相同的亲和力,从而使缓冲液质子化的相对量与指示剂质子化的量成比例,随着反应混合物 pH 值的变化而变化。然后制备由缓冲液、指示剂、待测水解酶和所需底物组成的反应混合物,让水解酶与底物发生反应。通过检测反应混合物的颜色变化来监测反应,颜色变化由反应对指示剂的影响决定。