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1简介呼吸细胞中普遍存在一种奇特的酶活性,底物是一种能在任何瞬间微量存在的不稳定自由基,即使在此酶缺失的情况下,这种催化反应也能快速进行。然而这种酶对于需氧细胞的存活是至关重要的,它可以催化清除超氧自由基,因而可以抵御氧中毒,因为超氧自由基是产生氧中毒的重要物质。超氧自由基清除反应是歧化反应,这种酶可提高反应速率,反应式如下。
1 Introduction A common enzyme activity in respiratory cells is that the substrate is a labile free radical that can be present in minute quantities at any moment, and the catalytic reaction proceeds rapidly even in the absence of this enzyme. However, this enzyme is crucial for the survival of aerobic cells. It catalyzes the removal of superoxide radicals and thus protects against oxygen poisoning, as superoxide radicals are an important source of oxygen poisoning. Superoxide radical scavenging reaction is disproportionation reaction, this enzyme can increase the reaction rate, the reaction is as follows.