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    • 8. 发明授权
    • Reversibly modified thermostable enzymes for DNA synthesis and amplification in vitro
    • 用于体外DNA合成和扩增的可逆修饰的热稳定酶
    • US07378262B2
    • 2008-05-27
    • US10317715
    • 2002-12-11
    • Harald SobekMichael Greif
    • Harald SobekMichael Greif
    • C12Q1/68C12N9/00C12N9/22
    • C12Q1/6848C12N9/1252C12N9/22C12N9/99C12Q1/686C12Q2549/101C12Q2521/319C12Q2521/101
    • The invention relates to a composition comprising a first modified thermostable enzyme exhibiting 3′exonuclease activity but essentially no DNA polymerase activity and a second modified thermostable enzyme exhibiting DNA polymerase activity, whereas the fidelity of an amplification process is enhanced by the use of the composition in an amplification process in comparison to the use of the single second enzyme in an amplification process and, whereas said first and said second modified thermostable enzyme is reversibly modified by an inhibiting agent which results in essentially complete inactivation of enzyme activity, wherein incubation of said first and said second modified thermostable enzyme in an aqueous buffer at alkaline pH at a temperature less than 25° C. for 20 minutes results in no significant increase in the activity of said first and said second modified thermostable enzyme, wherein incubation at a temperature greater than 50° C. in an aqueous buffer at alkaline pH results in at least tow-fold increase in enzyme activity in less than 20 minutes which allow formation of primer extension products.
    • 本发明涉及一种组合物,其包含显示出3'核酸酶活性但基本上不含DNA聚合酶活性的第一个修饰的热稳定酶,以及显示DNA聚合酶活性的第二个修饰的热稳定酶,而通过使用组合物来增强扩增过程的保真度 扩增过程与在扩增过程中单次第二酶的使用相比较,而所述第一和所述第二修饰的热稳定酶由抑制剂可逆地修饰,所述抑制剂导致酶活性基本完全失活,其中所述第一 并且所述第二修饰的热稳定酶在碱性pH在低于25℃的温度下在水性缓冲液中20分钟导致所述第一和所述第二修饰的热稳定酶的活性没有显着增加,其中在大于 50℃,在碱性pH溶液中的水性缓冲液中 在少于20分钟的时间内至少可以提高酶活性的三倍增加,从而形成引物延伸产物。