首页> 外文期刊>Journal of Molecular Biology >ATP HYDROLYSIS IS REQUIRED FOR DNA CLEAVAGE BY ECOPI RESTRICTION ENZYME
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ATP HYDROLYSIS IS REQUIRED FOR DNA CLEAVAGE BY ECOPI RESTRICTION ENZYME

机译:ECOPI限制性内切酶需要ATP水解来裂解DNA

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The type III restriction endonuclease EcoPI, coded by bacteriophage Fl, cleaves unmodified DNA in the presence of ATP and magnesium ions. We show that purified EcoPI restriction enzyme fails to cleave DNA in the presence of non-hydrolyzable ATP analogs. More importantly, this study demonstrates that EcoPI restriction enzyme has an inherent ATPase activity, and ATP hydrolysis is necessary for DNA cleavage. Furthermore, we show that the progress curve of the reaction with Eco PI restriction enzyme exhibits a lag which is dependent on the enzyme concentration. Kinetic analysis of the progress curves of the reaction suggest slow transitions that can occur during the reaction, characteristic of hysteretic enzymes. The role of ATP in the cleavage mechanism of type III restriction enzymes is discussed. [References: 24]
机译:由噬菌体F1编码的III型限制性核酸内切酶EcoPI在ATP和镁离子存在下切割未修饰的DNA。我们显示纯化的EcoPI限制酶无法在不可水解的ATP类似物的存在下切割DNA。更重要的是,这项研究证明EcoPI限制性内切酶具有固有的ATPase活性,并且ATP水解对于DNA切割是必需的。此外,我们显示与Eco PI限制酶反应的进度曲线显示出滞后,其取决于酶的浓度。反应进程曲线的动力学分析表明,在反应过程中可能发生缓慢的转变,这是迟滞酶的特征。讨论了ATP在III型限制酶裂解机理中的作用。 [参考:24]

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